阅读说明：本技术 一种飞机拖曳吊舱是否进入锁定位置判断方法 (Method for judging whether aircraft towing pod enters locking position ) 是由 马彦鹏 李五洲 吴超 王庆立 白会哲 于 2019-09-23 设计创作，主要内容包括：本发明属于飞机可收放外挂物收放技术领域,具体涉及一种飞机拖曳吊舱是否进入锁定位置判断方法。提供一种准确的飞机拖曳吊舱是否进入锁定位置的判断方法。通过微动开关信号、吊舱相对位置变化信号和接近开关信号综合判断吊舱是否进入锁定位置,每一类信号包括锁定、非锁定和无效三种状态。(The invention belongs to the technical field of retractable outer hanging object retraction of airplanes, and particularly relates to a method for judging whether an airplane towing pod enters a locking position or not. The method for judging whether the aircraft towing pod enters the locking position accurately is provided. Whether the nacelle enters the locking position or not is comprehensively judged through a microswitch signal, a nacelle relative position change signal and a proximity switch signal, and each type of signal comprises three states of locking, non-locking and invalid.)

1. A method for determining whether an aircraft towing pod enters a locked position, comprising: whether the nacelle enters the locking position or not is comprehensively judged through a microswitch signal, a nacelle relative position change signal and a proximity switch signal, and each type of signal comprises three states of locking, non-locking and invalid.

2. The method as claimed in claim 1, wherein the method comprises the steps of: and when the micro switch signal and the proximity switch signal are in a locking state simultaneously, or one of the micro switch signal and the proximity switch signal is in locking, and the other two signals are invalid, judging that the aircraft dragging nacelle enters a locking position.

3. The method as claimed in claim 1, wherein the method comprises the steps of: and judging that the aircraft dragging the pod enters an invalid position when the micro switch signal and the proximity switch signal are both invalid or one of the micro switch signal and the proximity switch signal is locked and the other one of the micro switch signal and the proximity switch signal is not locked and the pod relative position change signal is locked or invalid.

4. The method as claimed in claim 1, wherein the method comprises the steps of: and when the comprehensive judgment is invalid, determining whether the aircraft towing pod enters the locking position through manual observation.

5. The method as claimed in claim 1, wherein the method comprises the steps of: the micro switch signals are divided into two groups, and when the two groups of signals are inconsistent, the signals are in an invalid state.

6. The method as claimed in claim 1, wherein the method comprises the steps of: in a certain time range, when the relative position change of the pod is less than a specified value A, the pod is in a locking state;

in a certain time range, when the relative position change of the pod is greater than a specified value B, the pod is in an invalid state;

the pod relative position change is between the specified values A, B over a time frame and is unlocked.

7. The method as claimed in claim 6, wherein the method comprises the steps of: the specified value A is 3CM, and the specified value B is 50 CM.

8. The method as claimed in claim 6, wherein the method comprises the steps of: the certain time range is 2 seconds.

9. The method as claimed in claim 1, wherein the method comprises the steps of: when the resistance value output by the proximity switch is between 0 and a specified value C, the state is a locking state;

when the resistance value output by the proximity switch is larger than a specified value D, the state is a non-locking state;

when the resistance value of the proximity switch output is between specified values C and D, it is in an invalid state.

Technical Field

The invention belongs to the technical field of retractable outer hanging object retraction of airplanes, and particularly relates to a method for judging whether an airplane towing pod enters a locking position or not.

Background

The time domain aeroelectromagnetic system is an efficient geophysical exploration method, and geophysical exploration work such as metal mineral exploration is carried out by researching the change of earth resistivity. According to the requirements of a time domain system, a pod is required to be equipped, a receiving coil is arranged in the pod, and a secondary field generated by the primary field of a transmitting coil is sensed in the task implementation process.

The pod of the time domain aircraft is hung in a remote flexible dragging mode, the pod needs to be kept in a retracted state in the taking-off and landing stage, the pod needs to be put down in the task execution stage, and the pod needs to be retracted and locked by a mechanical device after the task is completed, so that the follow-up cruising, approaching and landing can be completed after the pod does not slip. In order to ensure the flight safety, the nacelle needs to be accurately judged to enter a locking position when being retracted, and an operator controls a mechanical mechanism to lock. Once a fault occurs, accurate judgment cannot be carried out, and great hidden danger is brought to airplane safety.

Disclosure of Invention

The technical problems solved by the invention are as follows: the method for judging whether the aircraft towing pod enters the locking position accurately is provided.

The technical scheme of the invention is as follows: a method for judging whether an aircraft dragging pod enters a locking position comprehensively judges whether the pod enters the locking position through a microswitch signal, a pod relative position change signal and a proximity switch signal, wherein each type of signal comprises three states of locking, non-locking and invalid.

Preferably, when the micro switch signal and the proximity switch signal are in a locking state at the same time, or one of the micro switch signal and the proximity switch signal is in a locking state, and the other two signals are invalid, the aircraft towing pod is judged to enter the locking position. And the accurate judgment of the locking state is ensured through the combination of the three types of signals.

Preferably, the position information of the aircraft towing pod is judged to be invalid when the microswitch signal and the proximity switch signal are both invalid or one of the microswitch signal and the proximity switch signal is locked and the other is not locked and the relative position change signal of the pod is locked or invalid. Through the combination of the three types of signals, when sufficient information cannot be acquired to support accurate judgment, an invalid signal is output, and misjudgment is avoided.

Preferably, when the comprehensive judgment is invalid, whether the aircraft towing pod enters the locking position is determined through manual observation.

Preferably, the microswitch signals are two groups, and when the signals of the two groups are not consistent, the signals are in an invalid state. When the two groups of signals are contradictory, the signals are set to be in an invalid state, so that the interference on comprehensive judgment is avoided.

Preferably, in a certain time range, when the relative position change of the pod is less than a specified value A, the pod is in a locking state; in a certain time range, when the relative position change of the pod is greater than a specified value B, the pod is in an invalid state; the pod relative position change is between the specified values A, B over a time frame and is unlocked. The lockout condition the relative pod position does not change more than a specified value a and at any time the relative pod position does not change more than a specified value B.

Preferably, the specified value a is 3CM, and the specified value B is 50 CM. Through research and analysis of the system and by means of empirical judgment, the relative position of the pod in the locking state is not changed by more than 3CM, and the relative position of the pod in any state is not changed by more than 50 CM.

Preferably, the certain time range is 2 seconds. If the time is too short, the influence caused by jolt and vibration is difficult to eliminate, and if the event is too long, the real-time performance of comprehensive judgment is difficult to ensure. And determining the certain time range to be 2 seconds by system requirement research and combined with empirical judgment.

Preferably, the proximity switch outputs a resistance value between 0 and a specified value C, which is a locked state; when the resistance value output by the proximity switch is larger than a specified value D, the state is a non-locking state; when the resistance value of the proximity switch output is between specified values C and D, it is in an invalid state. The grounding switch outputs a corresponding resistance value according to the approach distance, and when the output resistance value is lower than a specified value C, the nacelle can be determined to enter a locking position; when the output resistance value is greater than a specified value D, it can be determined that the nacelle is not in the locked position; when the output resistance value is between the specified value C and the specified value D, whether the pod is in the locking position or not is difficult to judge, invalid information is output, and misjudgment is avoided.

Drawings

FIG. 1 is a schematic configuration diagram of a method for determining whether a car is locked.

Detailed Description

As shown in fig. 1, a microswitch 1 and a microswitch 2 are mounted on the nacelle locking platform. When the nacelle enters the locking position, one section of the drag rod reaches the designated position, the microswitch 1 is triggered to output a locking signal, and the other section of the drag rod reaches the designated position, the microswitch 2 is triggered to output a locking signal. The resolving equipment receives two groups of signals output by the micro switch 1 and the micro switch 2, and judges that the micro switch signal is the only solution in 3 states of locking, unlocking or invalid through set logic (see detailed description in specific implementation mode).

And angle measuring equipment and distance measuring equipment are arranged under the belly of the rear section of the airplane, and the angle measuring equipment and the distance measuring equipment are combined to acquire pod position information in the whole process. The resolving equipment calculates the distance of the nacelle relative to a designated reference point on the airplane, monitors the change of the nacelle in unit time, and judges that the change signal of the nacelle relative position is a unique solution in 3 states of locking, unlocking or invalid through set logic (see detailed description).

And a proximity switch is arranged on the nacelle locking platform to acquire the position information of the nacelle relative to the locking platform. The resolving equipment judges that the proximity switch signal is a unique solution in 3 states of locking, unlocking or invalid according to the resistance value signal output by the proximity switch and through set logic (see detailed description).

And the resolving equipment carries out comprehensive judgment through set logic (detailed in a specific embodiment) according to the judgment results of the three types of signals, and determines that the position of the nacelle is a unique solution in 3 states of locking, non-locking or invalid.

When the comprehensive judgment result of the resolving equipment is 'locked', a continuous voltage signal is output to drive an indicator light to light up to prompt an operator that the nacelle enters a locking position, and a mechanical switch can be operated to lock; when the comprehensive judgment result of the resolving equipment is 'non-locking', no signal is output, the indicator lamp keeps an off state, and an operator can not operate the mechanical switch to lock; when the comprehensive judgment result of the resolving equipment is invalid, a continuously fluctuating voltage signal is output to drive an indicator lamp to flash, a driver is reminded that the comprehensive judgment result is invalid, and whether the aircraft towing pod enters a locking position or not is determined through manual observation.

Judging the trigger state through a microswitch:

two microswitches are mounted on the locking platform, which are switched off when the pod is in the non-locking position and switched on when the pod is in the locking position. The microswitch triggers a 'locking' logic when switched on and a 'non-locking' logic when switched off. The decision logic is shown in table 1:

TABLE 1 logic for determination of state triggered by microswitch

Microswitch 1	Microswitch 2	Judgment result 1
			Locking in	Locking in	Locking in
Locking in	Non-locking	Invalidation
			Non-locking	Locking in	Invalidation
Non-locking	Non-locking	Non-locking

Judging through the change of the relative position of the nacelle:

and the resolving equipment receives signals acquired by the nacelle position capturing holder and the ranging antenna and resolves the position of the nacelle relative to the locking platform. Whether the nacelle is in the "locked" position is determined by a change in the position of the nacelle relative to the locked platform. The specific logic is shown in table 2:

TABLE 2 logic for determining by nacelle relative position change

Relative locking platform displacement of nacelle within past 2 seconds	Judgment result 2
		Less than or equal to 3cm	Locking in
3cm to 50cm (inclusive)	Non-locking
		Greater than 50cm	Invalidation

Judging through a proximity switch:

a proximity switch is arranged, and when the nacelle enters a locking position, the proximity switch is triggered to output a GND signal; when the nacelle is not in the locked position, the proximity switch is not triggered, and an open circuit signal is output. The specific logic is shown in table 3:

TABLE 3 logic determination by proximity switch

Proximity switch output resistance to ground	Judgment result 3
		0 to 0.2 milli-ohm (inclusive)	Locking in
0.2 milli-ohm to 20 mega-ohm (inclusive)	Invalidation
		Greater than 20 megohms	Non-locking

And (4) comprehensive judgment:

and the resolving equipment determines a comprehensive judgment result according to the judgment results of the 3 judgment results and the matrix chart in the table 4.

TABLE 4 Integrated judgment logic

Mechanical backup judgment:

and when the comprehensive judgment result is invalid, the indicator lamp is lightened, an operator leaves the operating platform to a specified position, and observes the upper surface of the locking platform through the window, if the mechanical backup indicating device bounces, the nacelle enters the locking position, and if the mechanical backup indicating device does not bounce, the nacelle does not enter the locking position, and the observation is needed until the mechanical backup indicating device bounces, so that the nacelle can be locked.