阅读说明：本技术 一种微型惯组内置减振结构 (Built-in vibration reduction structure of micro inertial measurement unit ) 是由 邓富华 杨银川 饶兴桥 钱伟 董鹏飞 吴亚 罗小秋 刘生攀 浦秀华 张先全 代洪 于 2019-08-29 设计创作，主要内容包括：本公开涉及一种微型惯组内置减振结构,包括：带敏感元件电路支架、减振器、安装底座及质心平衡装置,其中,所述减振器由限位螺钉、减振垫Ⅰ、减振垫Ⅱ组成,所述带敏感元件电路支架只与减振垫Ⅰ接触,安装底座与减振垫Ⅰ、减振垫Ⅱ接触,与带敏感元件电路支架不直接接触；所述减振器呈正三角形或四边形均匀放置。本发明的优点是：结构简单,不仅测量精度大幅提升,体积大大缩小,而且抗冲击振动的能力有较大幅度增强,可以满足恶劣力学环境的应用要求。具有体积小、重量轻、成本低、可靠性高、抗高冲击振动等优势,环境适应性强,在精确武器制导控制领域具有良好的应用前景和军事意义。(The utility model relates to a miniature inertia unit embeds damping structure includes: the vibration damper comprises a sensitive element circuit support, a vibration damper, a mounting base and a mass center balancing device, wherein the vibration damper consists of a limiting screw, a vibration damping pad I and a vibration damping pad II; the shock absorbers are uniformly placed in a regular triangle or quadrangle shape. The invention has the advantages that: simple structure, not only measurement accuracy promotes by a wide margin, and the volume dwindles greatly, and shock-resistant vibration's ability has the great range reinforcing moreover, can satisfy the application requirement of abominable mechanical environment. The device has the advantages of small volume, light weight, low cost, high reliability, high impact vibration resistance and the like, has strong environmental adaptability, and has good application prospect and military significance in the field of precise weapon guidance control.)

1. A built-in damping structure of a micro inertial measurement unit is characterized by comprising: a circuit bracket with a sensitive element, a shock absorber, a mounting base and a mass center balancing device, wherein,

the shock absorber is composed of a limiting screw, a shock absorbing pad I and a shock absorbing pad II, the circuit support with the sensitive element is only contacted with the shock absorbing pad I, the mounting base is contacted with the shock absorbing pad I and the shock absorbing pad II, and the mounting base is not directly contacted with the circuit support with the sensitive element;

the mass center balancing device is arranged at one end of the limiting screw and used for adjusting the axial mass center to enable the mass center to be positioned between the damping pad I and the damping pad II;

the vibration absorber is placed in a regular triangle, and the center of mass of the circuit support for mounting the sensitive element and the balance block is positioned in the center of the triangle;

the mounting base extends to the middle position of the sensitive element circuit support and is located between the damping pad I and the damping pad II.

2. The micro inertial measurement unit built-in vibration damping structure according to claim 1, wherein the circuit support with the sensing element is composed of a support, an X-axis gyro and accelerometer plate, a Y-axis gyro and accelerometer plate, a Z-axis gyro and accelerometer plate, a FPG plate and an interface plate, and five circuit boards are electrically connected through flexible connection and are bonded on the support.

3. The built-in vibration damping structure of the micro inertial measurement unit of claim 2, wherein the micro inertial measurement unit has a size of phi 40mm x 23 mm.

4. The micro inertial measurement unit built-in vibration damping structure according to claim 3, wherein the limit screw is connected with the circuit support with the sensing element through a thread and is provided with a limit boss.

5. The micro inertial measurement unit built-in vibration damping structure according to claim 2, wherein the bottom surface of the bracket has three threaded holes arranged in a regular triangle for connecting the vibration damper.

6. A built-in damping structure of a micro inertial measurement unit is characterized by comprising: a circuit bracket with a sensitive element, a shock absorber, a mounting base and a mass center balancing device, wherein,

the shock absorber is composed of a limiting screw, a shock absorbing pad I and a shock absorbing pad II, the circuit support with the sensitive element is only contacted with the shock absorbing pad I, the mounting base is contacted with the shock absorbing pad I and the shock absorbing pad II, and the mounting base is not directly contacted with the circuit support with the sensitive element;

the mass center balancing device is arranged at one end of the limiting screw and used for adjusting the axial mass center to enable the mass center to be positioned between the damping pad I and the damping pad II;

the vibration absorbers are uniformly arranged in a quadrilateral shape, and the centers of mass of the sensitive element circuit support and the balance block are arranged at the center of the quadrilateral;

the mounting base extends to the middle position of the sensitive element circuit support and is located between the damping pad I and the damping pad II.

7. The micro inertial measurement unit built-in vibration damping structure according to claim 6, wherein the circuit support with the sensing element is composed of a support, an X-axis gyro and accelerometer plate, a Y-axis gyro and accelerometer plate, a Z-axis gyro and accelerometer plate, a FPG plate and an interface plate, and five circuit boards are electrically connected through flexible connection and are bonded on the support.

8. The built-in vibration damping structure of the micro inertial measurement unit of claim 6, wherein the micro inertial measurement unit has a size of phi 40mm x 23 mm.

9. The micro inertial measurement unit built-in vibration damping structure according to claim 6, wherein the limit screw is connected with the circuit support with the sensing element through a thread and is provided with a limit boss.

10. The micro inertial measurement unit built-in vibration damping structure according to claim 7, wherein the bottom surface of the bracket has four threaded holes in a quadrilateral arrangement for connecting the vibration damper.

Technical Field

The invention relates to a built-in vibration reduction structure of a micro inertial measurement unit.

Background

With the development of miniature missiles such as guided grenades and the like, the miniature inertial set is used as an important component of the missiles, the guidance performance of the missiles is determined by the measurement performance of the miniature inertial set, the size of the missiles is limited by the structural size of the miniature inertial set, and the reliability of the missiles is influenced by the stability of the miniature inertial set, so that the miniature inertial set also has to keep pace with the development steps of the missiles. The problem of restricting the development of the micro inertial measurement unit is solved, and the problems of structural size and mechanical environment bearing capacity are solved firstly.

The micro inertial measurement unit formed by the micro mechanical gyroscope, the micro mechanical accelerometer and the like is sensitive to impact vibration, particularly large-range impact, and has great influence on the stable output of the micro mechanical gyroscope. The micro inertial measurement unit is required to be small in size, so that great difficulty is brought to vibration reduction of the micro inertial measurement unit. At present, the micro inertial measurement unit which can keep stable output in the impact of more than 2000g in China has larger volume, or can not keep stable output or is directly damaged.

Disclosure of Invention

The invention aims to provide a built-in vibration reduction structure of a micro inertial measurement unit, which effectively reduces the installation space of the inertial measurement unit and greatly improves the measurement reliability.

In order to solve the technical problems, the invention adopts the technical scheme that: a built-in damping structure of a micro inertial measurement unit is characterized by comprising: a circuit bracket with a sensitive element, a shock absorber, a mounting base and a mass center balancing device, wherein,

the shock absorber is composed of a limiting screw, a shock absorbing pad I and a shock absorbing pad II, the circuit support with the sensitive element is only contacted with the shock absorbing pad I, the mounting base is contacted with the shock absorbing pad I and the shock absorbing pad II, and the mounting base is not directly contacted with the circuit support with the sensitive element;

the mass center balancing device is arranged at one end of the limiting screw and used for adjusting the axial mass center to enable the mass center to be positioned between the damping pad I and the damping pad II;

the vibration absorber is placed in a regular triangle, and the center of mass of the circuit support for mounting the sensitive element and the balance block is positioned in the center of the triangle;

the mounting base extends to the middle position of the sensitive element circuit support and is located between the damping pad I and the damping pad II.

Another object of the present invention is to provide a damping structure built in a micro inertial measurement unit, comprising: a circuit bracket with a sensitive element, a shock absorber, a mounting base and a mass center balancing device, wherein,

the shock absorber is composed of a limiting screw, a shock absorbing pad I and a shock absorbing pad II, the circuit support with the sensitive element is only contacted with the shock absorbing pad I, the mounting base is contacted with the shock absorbing pad I and the shock absorbing pad II, and the mounting base is not directly contacted with the circuit support with the sensitive element;

the mass center balancing device is arranged at one end of the limiting screw and used for adjusting the axial mass center to enable the mass center to be positioned between the damping pad I and the damping pad II;

the vibration absorbers are uniformly arranged in a quadrilateral shape, and the centers of mass of the sensitive element circuit support and the balance block are arranged at the center of the quadrilateral;

the mounting base extends to the middle position of the sensitive element circuit support and is located between the damping pad I and the damping pad II.

Compared with the prior art, the invention has the following beneficial technical effects:

simple structure includes: the circuit support with the sensitive elements, the shock absorber, the mounting base and the mass center balancing device adopt a three-point or four-point uniform distribution built-in micro shock absorption technology to realize the shock absorption design of the whole sensitive unit, so that the measurement precision is greatly improved, the volume is greatly reduced, the shock and vibration resistance capability is greatly enhanced, and the application requirement of a severe mechanical environment can be met. The device has the advantages of small volume, light weight, low cost, high reliability, high impact vibration resistance and the like, has strong environmental adaptability, and has good application prospect and military significance in the field of precise weapon guidance control.

Drawings

FIG. 1 is a schematic view of an embodiment of three support points of a built-in damping structure of a micro inertial measurement unit according to the present invention;

FIG. 2 is a side view of the embodiment shown in FIG. 1;

FIG. 3 is a schematic view of an embodiment of four support points of the damping structure built in the micro inertial measurement unit.

Schematic of the reference numerals

11-a mounting base, 12-a circuit bracket with a sensitive element, 13-a mass center balancing device,

14-limit screw, 15-damping pad I, 16-damping pad II

Detailed Description

The present invention will be described in further detail with reference to specific embodiments, but these examples are only illustrative and do not limit the scope of the present invention.

Referring to fig. 1 to 2, the present invention provides a built-in damping structure of a micro inertial measurement unit, including: a circuit bracket 12 with a sensitive element, a vibration damper, a mounting base 11 and a mass center balancing device 13, wherein,

the shock absorber is composed of a limiting screw 14, a shock absorbing pad I15 and a shock absorbing pad II 16, the circuit support 12 with the sensitive element is only contacted with the shock absorbing pad I15, the mounting base 11 is contacted with the shock absorbing pad I15 and the shock absorbing pad II 16, and is not directly contacted with the circuit support 12 with the sensitive element;

the mass center balancing device 13 is arranged at one end of the limiting screw 14 and is used for adjusting the axial mass center to enable the mass center to be positioned between the damping pad I15 and the damping pad II 16;

the vibration absorber is placed in a regular triangle, and the center of mass of the circuit support for mounting the sensitive element and the balance block is positioned in the center of the triangle;

the mounting base extends to the middle position of the sensitive element circuit support and is positioned between the damping pad I15 and the damping pad II 16.

In one embodiment, the sensitive element-equipped circuit support comprises a support, an X-axis gyro and accelerometer board, a Y-axis gyro and accelerometer board, a Z-axis gyro and accelerometer board, a FPG board and an interface board, wherein the five circuit boards are electrically communicated through flexible connection and are bonded on the support.

In one embodiment, the micro inertial measurement unit has dimensions Φ 40mm by 23 mm.

In one embodiment, the limiting screw is connected with the sensitive element circuit support through threads and is provided with a limiting boss.

In one embodiment, the bottom surface of the bracket is provided with three threaded holes which are arranged in a regular triangle and used for connecting the shock absorber.

Referring to fig. 3, another objective of the present invention is to provide a built-in damping structure for a micro inertial measurement unit, including: a circuit bracket with a sensitive element, a shock absorber, a mounting base and a mass center balancing device, wherein,

the shock absorber is composed of a limiting screw, a shock absorbing pad I and a shock absorbing pad II, the circuit support with the sensitive element is only contacted with the shock absorbing pad I, the mounting base is contacted with the shock absorbing pad I and the shock absorbing pad II, and the mounting base is not directly contacted with the circuit support with the sensitive element;

the mass center balancing device is arranged at one end of the limiting screw and used for adjusting the axial mass center to enable the mass center to be positioned between the damping pad I and the damping pad II;

the vibration absorbers are uniformly arranged in a quadrilateral shape, and the centers of mass of the sensitive element circuit support and the balance block are arranged at the center of the quadrilateral;

the mounting base extends to the middle position of the sensitive element circuit support and is located between the damping pad I and the damping pad II.

In one embodiment, the sensitive element-equipped circuit support comprises a support, an X-axis gyro and accelerometer board, a Y-axis gyro and accelerometer board, a Z-axis gyro and accelerometer board, a FPG board and an interface board, wherein the five circuit boards are electrically communicated through flexible connection and are bonded on the support.

In one embodiment, the micro inertial measurement unit has dimensions Φ 40mm by 23 mm.

In one embodiment, the limiting screw is connected with the sensitive element circuit support through threads and is provided with a limiting boss.

In one embodiment, the bottom surface of the bracket has four threaded holes in a quadrilateral arrangement for connecting the vibration damper.

As a specific embodiment, a damping mounting mode is adopted, wherein a damping pad I and a damping pad II are mounted on a limiting screw; the limit screw is connected with the circuit bracket with the sensitive element through threads and is provided with a limit boss; the mounting base extends to the middle position of the circuit support with the sensitive element and is positioned between the vibration damping pad I and the vibration damping pad II, so that the mounting base is isolated from the circuit support with the sensitive element through the vibration damper; the mass center balancing device is arranged at one end of the limiting screw and used for adjusting the axial mass center, so that the mass center is positioned between the damping pad I and the damping pad II.

As a specific embodiment, the micro inertial measurement unit consists of a circuit support with a sensitive element, a mounting base, a shock absorber and a mass center balancing device. The circuit support with the sensitive element is internally connected with the mounting base through the shock absorber, and the outer end of the limit screw of the shock absorber is a mass center balancing device.

As a specific embodiment, the shock absorber comprises a shock absorption pad I, a shock absorption pad II and a limit screw, and a small circle between the shock absorption pad I and the shock absorption pad II is embedded in a mounting hole of the mounting base.

As a specific embodiment, the circuit support with the sensitive element consists of a support, an X-axis gyro and accelerometer board, a Y-axis gyro and accelerometer board, a Z-axis gyro and accelerometer board, a FPG board and an interface board. The 5 circuit boards are electrically communicated through flexible connection and are bonded on the support, and 3 threaded holes which are arranged in a regular triangle shape are formed in the bottom surface of the support and are used for connecting the shock absorber.

FIG. 3 shows a damping structure for a micro inertial measurement unit with four supporting points. The structure of fig. 3 is constructed in a manner consistent with the 3 support points, except that the damper is 4 support point mounted.

According to the figure, when the guide grenade has impact energy, the mounting base and the circuit support with the sensitive element are separated by the shock absorber, so that the energy transmitted to the sensitive element is attenuated, and the purposes of shock absorption and shock isolation are achieved. The mass center balancing device adjusts the mass center of the bracket with the sensitive element circuit, so that the mass center of the bracket is between the damping pad I and the damping pad II; the vibration absorber is placed in a regular triangle or a quadrangle, and the center of mass of the vibration absorber provided with the sensitive element circuit support and the center of mass balancing device is located at the center of the triangle or the quadrangle.

The invention adopts a three-point or four-point uniform distribution type built-in micro shock absorber to reduce the volume of a product and improve the shock and vibration resistance, so that the volume of the micro inertial unit meets the system requirement, the shock resistance is more up to 3000g, and the firing conditions of primer ejection are completely met. The micro inertial measurement unit consists of a circuit support with a sensitive element, a shock absorber, a mounting base and a mass center balancing device. The circuit support with the sensitive element consists of an MEMS gyroscope, an MEMS accelerometer, a processing circuit of the MEMS accelerometer and a support; the mounting base is used for mounting and fixing a product and an external mechanical interface; the mass center balancing device is used for adjusting the mass center of the bracket with the sensitive element circuit to the geometric center of the shock absorber; the vibration absorber is composed of a limiting screw, a vibration absorbing pad I and a vibration absorbing pad II, the vibration absorbing pad II is firstly assembled on the limiting screw and then installed on the installation base together, and then the vibration absorbing pad I is assembled, so that the support with the sensitive element circuit is only contacted with the vibration absorbing pad I, the installation base is contacted with the vibration absorbing pad I and the vibration absorbing pad II, and is not directly contacted with the support with the sensitive element circuit. When impact energy of the guided grenade is transmitted to the miniature inertial measurement unit mounting base from the grenade body, the energy transmitted to the sensitive element is attenuated due to the fact that the mounting base and the support with the sensitive element circuit are separated by the vibration damping material, and the purpose of vibration damping is achieved.

The invention provides a built-in damping structure mode of a micro inertial unit for a guided grenade based on a micro mechanical gyroscope, a micro mechanical accelerometer and a processing circuit combination thereof, reduces the volume of the whole machine, innovatively uses a built-in three-point or four-point uniform distribution type micro damping technology to improve the shock resistance, successfully develops the micro inertial unit of an important part of the guided grenade, can realize the function of measuring the posture of the missile by using the minimum hardware scale and can adapt to the influence of high impact energy on a sensitive element during launching by adopting the micro integration technology. The micro inertial measurement unit comprises a circuit support with a sensitive element, a shock absorber, a mounting base, a mass center balancing device and the like.

Test of

The invention has the advantages of small volume, light weight, low cost, high reliability, high impact vibration resistance and the like, has strong environmental adaptability, and has good application prospect and military significance in the field of precise weapon guidance control. The charged state successfully passes a 3000g large-scale impact test, application verification is carried out on a plurality of micro missiles, and the micro missiles participate in multiple flight tests, and the performance is excellent in the test process. According to the micro inertial measurement unit, the upper-level system requires structural arrangement in a range of phi 40mm multiplied by 23mm, and the charged state can keep normal output in and after impact of 2000g, which is leading in China.

The invention has the following beneficial technical effects:

simple structure includes: the circuit support with the sensitive elements, the shock absorber, the mounting base and the mass center balancing device adopt a three-point or four-point uniform distribution built-in micro shock absorption technology to realize the shock absorption design of the whole sensitive unit, so that the measurement precision is greatly improved, the volume is greatly reduced, the shock and vibration resistance capability is greatly enhanced, and the application requirement of a severe mechanical environment can be met. The device has the advantages of small volume, light weight, low cost, high reliability, high impact vibration resistance and the like, has strong environmental adaptability, and has good application prospect and military significance in the field of precise weapon guidance control. While the invention has been described with reference to preferred embodiments, it is not intended to be limited thereto. It is obvious that not all embodiments need be, nor cannot be exhaustive here. Variations and modifications of the present invention can be made by those skilled in the art without departing from the spirit and scope of the present invention by using the design and content of the above disclosed embodiments, and therefore, any simple modification, parameter change and modification of the above embodiments based on the research essence of the present invention shall fall within the protection scope of the present invention.