阅读说明：本技术 一种基于电磁弹射的微重力模拟装置及方法 (Microgravity simulation device and method based on electromagnetic ejection ) 是由 李洪银 肖春雨 周泽兵 吴书朝 于 2020-04-28 设计创作，主要内容包括：本发明涉及微重力测试技术领域,公开了一种基于电磁弹射的微重力模拟装置及方法,微重力模拟装置包括：落仓,导轨,托盘,直线电机和控制模块；导轨用于约束托盘的运动并为直线电机提供安装位置；托盘用于为落仓提供支持力以实现落仓在弹射时加速和回收时减速；直线电机用于产生电磁力并在电磁弹射阶段推动托盘带动落仓加速,并推动落仓和托盘一同运动,在无拖曳控制阶段只推动所述托盘运动；落仓为待测仪器提供真空环境,并屏蔽托盘上永磁体和直线电机引入的磁场干扰。本发明采用电磁弹射的方式可以避免气动装置造成的真空度减弱的影响；同时还能够使单次微重力试验的有效时间翻倍；采用直线电机控制回收阶段可避免下落时的冲击损坏。(The invention relates to the technical field of microgravity test, and discloses a microgravity simulation device and a microgravity simulation method based on electromagnetic ejection, wherein the microgravity simulation device comprises: the device comprises a bin, a guide rail, a tray, a linear motor and a control module; the guide rail is used for restricting the movement of the tray and providing a mounting position for the linear motor; the tray is used for providing a supporting force for the falling bin so as to realize acceleration of the falling bin during ejection and deceleration during recovery; the linear motor is used for generating electromagnetic force, pushing the tray to drive the falling bin to accelerate in the electromagnetic ejection stage, pushing the falling bin to move together with the tray, and only pushing the tray to move in the non-dragging control stage; the falling bin provides a vacuum environment for the instrument to be tested and shields magnetic field interference introduced by the permanent magnet on the tray and the linear motor. The electromagnetic ejection mode is adopted, so that the influence of weakening of vacuum degree caused by a pneumatic device can be avoided; meanwhile, the effective time of a single microgravity test can be doubled; the linear motor is adopted to control the recovery stage, so that impact damage during falling can be avoided.)

1. The utility model provides a microgravity analogue means based on electromagnetism is launched which characterized in that includes: the device comprises a falling bin (11), a guide rail (12), a tray (13), a linear motor (14) and a control module (15);

the guide rail (12) is used for restricting the movement of the tray (13) and providing a mounting position for the linear motor (14);

the tray (13) is used for providing a supporting force for the falling bin so as to realize acceleration of the falling bin (11) during ejection and deceleration during recovery;

the linear motor (14) is used for generating electromagnetic force, pushing the tray (13) to drive the falling bin (11) to accelerate in an electromagnetic ejection stage, pushing the falling bin (11) and the tray (13) to move together, and only pushing the tray (13) to move in a non-dragging control stage;

the falling bin (11) is used for loading an instrument to be tested, providing a vacuum environment for the instrument to be tested and shielding magnetic field interference introduced by the permanent magnet on the tray (13) and the linear motor (14);

the control module (15) is used for calculating a control signal according to the distance between the tray and the ground and the distance between the tray and the falling bin and driving the linear motor (14) to generate the electromagnetic force.

2. Microgravity simulation device according to claim 1, characterized in that the linear motor (14) is provided with a plurality of turns, and that the turns of the linear motor are arranged closely during the ejection phase and sparsely during the drag-free control phase.

3. A microgravity simulation device according to claim 1 or 2, wherein a plurality of permanent magnets are provided on both sides of the tray (13), and adjacent permanent magnets are arranged in opposite directions.

4. A microgravity simulation device according to any of claims 1-3, wherein the tray (13) is connected to the guide rail (12) by a bayonet.

5. A microgravity simulation device according to any one of claims 1-4, wherein a position sensor is arranged on the tray (13) for detecting the distance between the tray (13) and the ground, and between the tray (13) and the drop bin (11).

6. A microgravity simulator according to any one of claims 1 to 5, wherein, in operation, during the ejection phase, the acceleration of the drop chamber (11) is greater than the acceleration of gravity, for detecting the reliability of the protection device when the accelerometer is not in operation; in the non-dragging control stage, when the tray (13) is separated from the falling bin (11), the interior of the falling bin (11) is in a microgravity environment, and the residual acceleration can be measured by an accelerometer and used for detecting various performances of the accelerometer during working; in the free falling body stage, when the falling bin (11) falls to be in contact with the tray (13), the falling bin starts to decelerate, and when the acceleration of the falling bin (11) gradually exceeds the range of the accelerometer, a protection device is started for detecting whether the response time of the protection device starting is within the safe time.

7. The microgravity simulator of any one of claims 1-6, wherein the electromagnetic force generated during the electromagnetic ejection phase is F-IB L, wherein L is the length of the coil of the linear motor in the magnetic field, I is the applied current, and B is the magnetic induction intensity of the magnetic field formed by the permanent magnets on the tray.

8. A microgravity simulation device according to any one of claims 1-7, further comprising a vacuum chamber (16) for providing a vacuum environment for the simulation device, wherein the vacuum environment provided by the drop bin (11) has a vacuum level higher than the vacuum level of the vacuum chamber (16).

9. A microgravity simulation method based on the microgravity simulation apparatus according to any one of claims 1 to 8, comprising the steps of:

s1: loading current to a linear motor and generating electromagnetic force, wherein the tray is driven by the electromagnetic force to drive the falling bin to move together in an accelerated manner until the ejection stage is finished;

s2: after the ejection stage is finished, the tray is decelerated and separated from the falling bin, and enters a non-dragging control stage, at the moment, the falling bin is taken as a reference system, the relative acceleration of the device to be tested in the falling bin approaches to zero, and a microgravity environment is provided for a microgravity experiment;

s3: when the falling bin falls to contact with the tray, the falling bin decelerates and enters a free falling body stage, and the tray is controlled to decelerate by monitoring the distance between the tray and the ground in real time so as to avoid damage to the experimental device caused by overlarge acceleration during recovery.

10. The microgravity simulation method according to claim 9, further comprising, in step S2: and the distance between the tray and the bin is controlled to be kept constant by monitoring the distance between the tray and the bin in real time.

Technical Field

The invention belongs to the technical field of microgravity test, and particularly relates to a microgravity simulation device and method based on electromagnetic ejection.

Background

For various high-precision scientific instruments on board a satellite, microgravity experiments need to be carried out on the ground in order to test various performances of the instruments before use. The common microgravity experiment is based on free fall, takes a free-falling cabin body as a reference system, is relatively positioned in a microgravity environment inside, and can be used for evaluating the performance of an instrument under microgravity. In order to provide a relatively stable falling environment for the experiment, the experiment is generally performed in a falling tower having a certain height. The main idea of falling the tower is to lift the falling bin to a high place by a certain means, control the release of the falling bin by a specific device, and complete the microgravity experiment in the falling process.

The fall time of a single-pass falling tower is short, and a higher falling tower needs to be built for prolonging the time, so that the construction cost is greatly increased, and the benefit is low. The ejection method is adopted to double the experimental time, a mode of ejecting by using pneumatic force exists abroad, a driving system is generally complex, higher gas pressure is needed, meanwhile, the system is not easy to maintain, the number of working times per day is less, and residual gas after pneumatic ejection cannot be well compatible with a vacuum system.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a microgravity simulation device based on electromagnetic ejection, and aims to solve the problems that the existing device is low in efficiency and cannot reasonably recover a microgravity test device.

The invention provides a microgravity simulation device based on electromagnetic ejection, which comprises: the device comprises a bin, a guide rail, a tray, a linear motor and a control module; the guide rail is used for restraining the movement of the tray and providing a mounting position for the linear motor; the tray is used for providing a supporting force for the falling bin so as to realize acceleration of the falling bin during ejection and deceleration during recovery; the linear motor is used for generating electromagnetic force, pushing the tray to drive the falling bin to accelerate in the electromagnetic ejection stage, pushing the falling bin to move together with the tray, and only pushing the tray to move in the non-dragging control stage; the falling bin is used for loading an instrument to be tested, providing a vacuum environment for the instrument to be tested and shielding magnetic field interference introduced by the permanent magnet on the tray and the linear motor; the control module is used for calculating a control signal according to the distance between the tray and the ground and the distance between the tray and the falling bin and driving the linear motor to generate electromagnetic force.

Furthermore, the linear motor is provided with a plurality of turns of coils, the coils of the linear motor are arranged closely in the ejection stage, and the coils of the linear motor are arranged sparsely in the non-dragging control stage.

Further, a plurality of permanent magnets are provided at both sides of the tray, and the adjacent permanent magnets are arranged in opposite directions.

Further, the tray is connected to the guide rail by a bayonet.

Furthermore, a position sensor is arranged on the tray and used for detecting the distance between the tray and the ground and the distance between the tray and the falling bin.

Furthermore, during work, in the ejection stage, the acceleration of the falling bin is greater than the gravity acceleration, and the acceleration is used for detecting the reliability of the protection device when the accelerometer is not in work; in the non-dragging control stage, when the tray is separated from the falling bin, the interior of the falling bin is in a microgravity environment, and the residual acceleration can be measured by the accelerometer and is used for detecting various performances of the accelerometer during working; and in the free falling body stage, the falling bin starts to decelerate when falling to be in contact with the tray, and the protection device is started when the acceleration of the falling bin gradually exceeds the range of the accelerometer, so as to detect whether the response time of the starting of the protection device is within the safe time.

Furthermore, the electromagnetic force F generated in the electromagnetic ejection stage is IB L, where L is the length of the coil of the linear motor in the magnetic field, I is the applied current, and B is the magnetic induction intensity of the magnetic field formed by the permanent magnet on the tray.

Furthermore, the microgravity simulator also comprises a vacuum cavity for providing a vacuum environment for the simulator, and the vacuum degree of the vacuum environment provided by the falling bin is higher than that of the vacuum cavity.

The microgravity simulation device provided by the invention adopts the electromagnetic ejection mechanism, and has the following advantages compared with the prior art:

(1) the electromagnetic ejection provides an initial speed for the experimental device, and the gravity of each part of the device enables the experimental device to decelerate at the same acceleration, so that the supporting force between the parts is almost zero, and the experimental device is in a microgravity state. Therefore, the falling bin can also provide a microgravity environment for the experimental device in the ascending stage, and compared with the existing falling tower which only utilizes the descending section to generate the microgravity environment and has the same height, the experimental device can provide twice more experimental time, so that the working efficiency of the experimental device is improved.

(2) By adopting electromagnetic ejection, different ejection accelerations can be realized by adjusting the electromagnetic force so as to adapt to experimental devices with different weights; compared with mechanical ejection, the applied thrust curve can be refined, so that the experimental instrument is prevented from being damaged by excessive impact, and the microgravity experimental device can be reasonably recovered; and compared with a pneumatic device, the vacuum device can avoid releasing redundant gas to influence the vacuum environment in the vacuum cavity.

(3) The dragging-free control section is arranged on the guide rail, the distance between the tray and the blanking bin is detected by using the distance sensor on the tray, the blanking bin is used as an inertial reference, and the distance between the tray and the blanking bin can be controlled by the linear motor of the dragging-free control section so as to partially verify the dragging-free control algorithm.

(4) Utilize not having the control section of dragging to control the tray and catch the storehouse of falling in the storehouse decline stage, can realize the harmless recovery in storehouse of falling, compare with prior art, acceleration is too big when avoiding retrieving and leads to the experimental apparatus to damage.

(5) This device is by electric drive, compares with prior art, and the preparation time of microgravity experiment is shorter, is more convenient for carry out the experiment repeatedly many times.

The invention also provides a microgravity simulation method based on the microgravity simulation device, which comprises the following steps:

s1: loading current to a linear motor and generating electromagnetic force, wherein the tray is driven by the electromagnetic force to drive the falling bin to move together in an accelerated manner until the ejection stage is finished;

s2: after the ejection stage is finished, the tray is decelerated and separated from the falling bin, and enters a non-dragging control stage, at the moment, the falling bin is taken as a reference system, the relative acceleration of the device to be tested in the falling bin approaches to zero, and a microgravity environment is provided for a microgravity experiment;

s3: when the falling bin falls to contact with the tray, the falling bin decelerates and enters a free falling body stage, and the tray is controlled to decelerate by monitoring the distance between the tray and the ground in real time so as to avoid damage to the experimental device caused by overlarge acceleration during recovery.

Further, in step S2, the method further includes: and the distance between the tray and the bin is controlled to be kept constant by monitoring the distance between the tray and the bin in real time.

According to the microgravity simulation method provided by the embodiment of the invention, the tray is driven by the electromagnetic force to drive the falling bin to accelerate until the ejection stage is finished by applying current to the linear motor and generating the electromagnetic force, and the reliability of the protection device when the accelerometer is not in operation can be detected at the stage. When the tray is separated from the falling bin, the tray enters a non-dragging control stage, the falling bin is in a microgravity environment, residual acceleration can be measured by the accelerometer, and various performances of the accelerometer during working can be detected at the stage. When the falling bin falls to contact with the tray, the falling bin starts to decelerate and enters a free falling body stage, the protection device is started when the acceleration of the falling bin gradually exceeds the range of the accelerometer, and whether the response time of the protection device is within the safe time or not can be detected in the stage.

Drawings

Fig. 1 is a schematic structural diagram of a microgravity simulation device based on electromagnetic ejection provided by the invention;

FIG. 2 is a detailed structural diagram of a tray in the microgravity simulation device based on electromagnetic ejection provided by the invention;

fig. 3 is a top view of the connection between the tray and the guide rail in the microgravity simulation device based on electromagnetic ejection provided by the invention;

fig. 4 is a work flow chart of a microgravity simulation method implemented by the microgravity simulation device based on electromagnetic ejection provided by the invention.

The system comprises a microgravity simulator 1, an instrument to be tested 2, a distance sensor 3, a permanent magnet 4, a falling bin 11, a guide rail 12, a tray 13, a linear motor 14, a control module 15 (not shown), a vacuum cavity 16 and an internal frame 17.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention relates to a ground free fall experiment, a ground microgravity experiment, an electromagnetic ejection application and a non-dragging control experiment, belonging to the field of physical experiments and instruments.

The invention relates to a ground microgravity experiment, a cabin body of a tower falling device for the ground microgravity experiment is launched in two modes, one mode is that the cabin body is lifted to a high place by a winch and then is freely released from the high place, and the other mode is that the cabin body is shot upwards from the ground, and the cabin body is also in a microgravity state in the ascending stage of the cabin body, so that the available time of the microgravity experiment is doubled. The invention aims to eject the capsule body in the experiment of free falling by using electromagnetic force, the electromagnetic force can provide larger acceleration, and meanwhile, the control of the acceleration is more accurate and smooth, thereby being beneficial to flexibly ejecting capsule bodies with different qualities and controlling the maximum value of the acceleration in the ejection process.

Fig. 1 shows the structure of a microgravity simulation device based on electromagnetic ejection provided by the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:

microgravity analogue means 1 based on electromagnetic ejection includes: the device comprises a falling bin 11, a guide rail 12, a tray 13, a linear motor 14 and a control module 15; the falling bin 11 is used for loading an instrument to be tested, providing an internal environment with higher vacuum degree relative to an external vacuum cavity for the instrument, and shielding magnetic field interference introduced by a permanent magnet on the tray and a linear motor; the guide rail 12 is used for restricting the movement of the tray and providing a mounting position for the linear motor; the tray 13 is used for providing a supporting force for the falling bin so as to realize acceleration of the falling bin during ejection and deceleration during recovery; the linear motor 14 is used for generating electromagnetic force to control the movement of the tray; the control module 15 is used for calculating a control signal to drive the linear motor to generate electromagnetic force.

Compared with the prior art, the electromagnetic ejection is adopted, so that the influence of vacuum degree weakening caused by a pneumatic device is avoided; meanwhile, the ejection mode is adopted, so that the effective time of a single microgravity test can be doubled; the recovery stage is controlled by a linear motor, so that the device to be tested can be prevented from being damaged by impact when the device falls.

The invention utilizes the principle of electromagnetic induction, and applies specific current to the linear motor 14 to generate electromagnetic force, so as to accelerate the tray 13 and the falling bin 11 upwards, the magnitude of the electromagnetic force can be designed according to the requirement of experiments on the acceleration of the ejection process according to an electromagnetic force formula F-IB L, the magnitude of the current which should be applied is further calculated according to the sensitivity of an actuator of the linear motor 14, but the current should not exceed the use range of the linear motor 14, after the ejection stage is finished, the falling bin 11 is contacted with the tray 13 again until falling, only the gravity is acted during the period, the falling bin 11 is used as a reference system, the relative acceleration of an internal device to be tested approaches zero, and various microgravity experiments can be carried out.

The microgravity simulation device provided by the invention can be used for testing various performances of the accelerometer, in an ejection stage, the acceleration of the falling bin 11 is greater than a gravity acceleration, and is similar to the gravity environment in a rocket launching stage, and the reliability of the protection device when the high-precision accelerometer is not in a working state can be inspected in the stage; when the tray 13 is separated from the falling bin 11, the interior of the falling bin 11 is in a microgravity environment, the residual acceleration can be measured by the accelerometer, and various performances of the accelerometer in a normal working mode can be inspected; when the falling is in contact with the tray 13 and the deceleration is started, the acceleration of the falling bin 11 gradually exceeds the range of the accelerometer, the protection device should be started, and the experiment can be used for inspecting whether the response time of the protection device starting is within the safe time.

The microgravity simulation device provided by the invention can be used for testing the effectiveness of a non-dragging control algorithm, and specifically, the tray 13 can move up and down within a certain range, and the movement of the tray 13 is controlled by the linear motor 14 driven by the control module 15. After the electromagnetic ejection stage is finished and the falling bin 11 is separated from the tray 13, if the distance between the tray 13 and the falling bin 11 is used as signal input to control the distance between the tray 13 and the falling bin 11 to be constant, drag-free control on the single-degree-of-freedom direction of the airship can be simulated, and the change value of the distance between the tray 13 and the falling bin 11 is used as residual displacement disturbance of the drag-free control, so that the effectiveness of a drag-free control algorithm can be evaluated.

The microgravity simulation device provided by the invention can be used for carrying out other microgravity experiments, and can provide twice of experiment time compared with the common tower falling time under the condition of the same tower falling height. Meanwhile, the tray can be controlled in various ways, and the change of the satellite environment during the orbit can be simulated in a single degree of freedom.

The invention can miniaturize the whole device, and the single operation time and the free falling time are in the same order, thereby having higher efficiency.

To further explain the structure and operation mode of the microgravity simulator provided by the present invention, the present invention will be described in detail with reference to fig. 1, fig. 2, fig. 3 and fig. 4 and specific embodiments as follows:

microgravity analogue means based on electromagnetism ejection includes: a blanking chamber 11, a guide rail 12, a tray 13, a linear motor 14 and a control module 15 (not shown in the figure); the falling bin 11 is placed on the tray 13; the pallet is clamped on the guide rail 12; the linear motor 14 is arranged outside the guide rail 12; the control module 15 may be located outside the tower and its output connected to the linear motor 14.

The coils of the linear motor 14 are arranged closely during the ejection phase and sparsely during the non-drag control phase.

The coil is used for generating electromagnetic force in the electromagnetic ejection stage and pushing the tray 13 to drive the falling bin 11 to accelerate; the linear motor in the ejection stage needs to push the falling bin 11 and the tray 13 to move together, so that the coils are dense; in the non-dragging control stage, the linear motor 14 only needs to push the tray 13, and the coil can be looser.

The electromagnetic ejection mechanism utilizes the characteristic that an electrified coil is stressed in a magnetic field, and the tray is stressed by an upward force F equal to IB L, wherein L is the length of the coil of the linear motor 14 on the guide rail 12 in the magnetic field, I is the electrified current, and B is the magnetic induction intensity of the magnetic field formed by the permanent magnets on the tray 13.

The tray 13 is connected with the guide rail 12 through a bayonet, so that the tray 13 is prevented from being separated from the rail in the movement process; the tray 13 is provided with a position sensor for detecting the distance between the tray 13 and the ground, between the tray 13 and the drop bin 11, for controlling the drop of the tray 13 so as not to collide with the ground violently, and for controlling the tray 13 without dragging.

Good experimental environment should be provided to the storehouse 11 that falls inside, and it is vacuum and electromagnetic shielding performance good to fall in the storehouse 11, if the storehouse 11 that falls changes the demand that surpasses the microgravity experiment to the gesture in the operation process, can be in the storehouse of falling installation gyroscope in order to maintain the gesture in the free fall stage.

The control flow of the invention is as shown in fig. 4, when the device is used for microgravity experiment, firstly, the instrument to be tested is placed in the falling bin 11, and the falling bin 11 is stably placed on the tray 13, the mass and the allowable acceleration of the device are input in the control module, the computer calculates the required acceleration signal for ejection according to F ═ IB L, the acceleration signal is input to the controller, the linear motor is started by the control signal output by the controller to start ejection, after the tray 13 is ejected, the distance between the tray 13 and the falling bin 11 is monitored by the distance sensor, the signal is used for controlling the tray 13 to decelerate the falling bin 11 in the recovery stage, and the tray can be controlled by the signal in the no-drag experiment.

After the ejection stage, the tray 13 is controlled by the linear motor 14 of the drag-free control section according to an algorithm which should make the tray 13 achieve the following effects: firstly, monitoring the distance between the tray 13 and the falling bin 11 to avoid the collision with the falling bin 11 during the microgravity experiment to influence the experiment; secondly, the relative speed between the cabin body and the tray 13 can be further evaluated by monitoring the distance between the tray 13 and the cabin body, the tray 13 is just in contact with the cabin body and has the same speed when the cabin falling 11 enters a recovery stage under good control, then the tray 13 is controlled to decelerate through electromagnetic force, and the decelerating force is changed from small to large, so that the instrument or the cabin body can be prevented from being damaged due to severe collision when the cabin body is recovered; third, the distance of the tray 13 from the ground is monitored to prevent a severe collision with the ground.

The electromagnetic ejection device has dual functions of ejection and recovery, and electromagnetic induction is sensitive to the speed of the cabin body, so that the electromagnetic ejection device can be used for monitoring the speed of the cabin body in the recovery stage and assisting in controlling the recovery force.

The microgravity simulation device provided by the invention adopts the electromagnetic ejection mechanism, and has the following advantages compared with the prior art:

(1) the ejection provides an initial speed for the experimental device, and the gravity of each part of the device enables the experimental device to decelerate at the same acceleration, so that the supporting force between the parts is almost zero, and the experimental device is in a microgravity state. Therefore, the falling bin can also provide a microgravity environment for the experimental device in the rising stage, and compared with the microgravity environment generated only by the falling section in the existing falling tower, the experimental device with the same height can provide one time of experimental time.

(2) By adopting electromagnetic ejection, different ejection accelerations can be realized by adjusting the electromagnetic force so as to adapt to experimental devices with different weights; compared with mechanical ejection, the applied thrust curve can be refined, so that the experimental instrument is prevented from being damaged by excessive impact; compared with a pneumatic device, the vacuum device can avoid releasing excessive gas to influence the vacuum environment in the vacuum cavity.

(3) The dragging-free control section is arranged on the guide rail, the distance between the tray and the blanking bin is detected by using the distance sensor on the tray, the blanking bin is used as an inertial reference, and the distance between the tray and the blanking bin can be controlled by the linear motor of the dragging-free control section so as to partially verify the dragging-free control algorithm.

(4) Utilize not having the control section of dragging to control the tray and catch the storehouse of falling in the storehouse decline stage, can realize the harmless recovery in storehouse of falling, compare with prior art, acceleration is too big when avoiding retrieving and leads to the experimental apparatus to damage.

(5) This device is by electric drive, compares with prior art, and the preparation time of microgravity experiment is shorter, is more convenient for carry out the experiment repeatedly many times.

The embodiment of the invention also provides a microgravity simulation method of the microgravity simulation device based on electromagnetic ejection, which specifically comprises the following steps as shown in fig. 4:

(1) by loading current to the linear motor and generating electromagnetic force;

(2) the tray and the bin are driven to move in an accelerated manner by the electromagnetic force generated by the linear motor;

(3) when the tray and the falling bin are accelerated together to the end of the ejection stage, the tray is decelerated and separated from the falling bin;

(4) monitoring the distance between the tray and the bin through a distance sensor;

(5) the linear motor is driven by the controller, and the constant distance between the tray and the bin is controlled in real time;

(6) judging whether the falling bin is in a rising stage, if so, returning to the step (4); if not, entering the step (7);

(7) monitoring the distance between the tray and the bin through a distance sensor;

(8) the linear motor is driven by the controller and the tray is controlled to contact with the falling bin;

(9) when the falling bin falls to be in contact with the tray, the falling bin decelerates and enters a free falling body stage, and the distance between the tray and the ground is monitored through a distance sensor;

(10) and driving the linear motor through the controller and controlling the speed of the tray to be reduced until the end.

According to the microgravity simulation method provided by the embodiment of the invention, the tray is driven by the electromagnetic force to drive the falling bin to accelerate until the ejection stage is finished by applying current to the linear motor and generating the electromagnetic force, and the reliability of the protection device when the accelerometer is not in operation can be detected at the stage. When the tray is separated from the falling bin, the tray enters a non-dragging control stage, the falling bin is in a microgravity environment, residual acceleration can be measured by the accelerometer, and various performances of the accelerometer during working can be detected at the stage. When the falling bin falls to contact with the tray, the falling bin starts to decelerate and enters a free falling body stage, the protection device is started when the acceleration of the falling bin gradually exceeds the range of the accelerometer, and whether the response time of the protection device is within the safe time or not can be detected in the stage.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.