An active vibration isolation system and an electrical equipment box for reducing the acceleration response of a circuit board

Abstract

The present invention belongs to the field of aerospace technology, and specifically provides an active vibration isolation system and an electrical equipment box for reducing the acceleration response of a circuit board, including a circuit board for carrying electronic components, a support bottom plate for installing the circuit board, and fixing the circuit board on a working surface, a vibration isolation component for generating a damping force to counteract the deformation of the circuit board, one end of the vibration isolation component is fixed on the support bottom plate, and the other end abuts against the target position of the circuit board; an acceleration sensor, installed on the circuit board, for detecting the acceleration at the target position. In the working state, the acceleration sensor detects the acceleration at the target position, and the vibration isolation component generates a damping force opposite to the acceleration at the target position according to the acceleration, and uses the damping force to suppress the resonance response of the circuit board. The active vibration isolation system provided by the present invention can attenuate the response at the resonance peaks of the 1st to 3rd orders of the circuit board, thereby reducing the response of the circuit board, and thus providing vibration protection for the electronic components on the circuit board.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and particularly to an active vibration isolation system for reducing the acceleration response of a circuit board and an electrical equipment box. Background Art

[0002] When a space payload is launched with a rocket, the payload will experience a large random vibration load. Some rockets require the vibration level of loads such as electrical boxes to reach 40g or even higher during launch. The circuit board in the electrical box will be further amplified due to its own resonance during random vibration, resulting in an acceleration response on the board reaching several hundred g, which will cause great damage to the components installed on the circuit board. Therefore, in view of the increasingly strict requirements for random vibration conditions, it is necessary to control the vibration response of the circuit board and reduce the acceleration response of the circuit board.

[0003] Currently, the main methods adopted are to increase the structural stiffness of the circuit board and adopt passive vibration isolation strategies to avoid damage caused by external vibration. However, these methods will cause the circuit board to be too heavy, occupy too much space, and increase the launch cost. Therefore, conducting research on an active vibration isolation system for suppressing the deformation of the circuit board, while reducing the acceleration response of the circuit board components and making it as lightweight as possible, has very important engineering significance. Summary of the Invention

[0004] In view of this, an active vibration isolation system for reducing the acceleration response of a circuit board and an electrical equipment box are provided in an embodiment of the present invention.

[0005] In a first aspect, the present invention provides an active vibration isolation system for reducing the acceleration response of a circuit board, including:

[0006] A circuit board for carrying electronic components;

[0007] A support bottom plate for installing the circuit board and fixing the circuit board on a working surface;

[0008] A vibration isolation component for generating a damping force to counteract the deformation of the circuit board. One end of the vibration isolation component is fixed on the support bottom plate, and the other end of the vibration isolation component abuts against a target position of the circuit board. The target position is determined by analyzing the modal vibration modes of each order of the circuit board through finite element analysis software and determining the maximum response of the vibration mode to be suppressed.

[0009] An acceleration sensor installed on the circuit board for detecting the acceleration at the target position;

[0010] In the working state, the acceleration sensor detects the acceleration of the target position, and the vibration isolation component generates a damping force opposite to the acceleration of the target position according to the acceleration, and uses the damping force to suppress the resonance response of the circuit board.

[0011] As an alternative solution, the vibration isolation component adopts a voice coil motor. The stator of the voice coil motor is fixed on the support bottom plate, and the mover of the voice coil motor is installed on the circuit board, and a damping force is applied to the circuit board through the mover.

[0012] As an alternative solution, the number of the vibration isolation components is 5.

[0013] As an alternative solution, the 5 vibration isolation components are evenly distributed on the support bottom plate.

[0014] As an alternative solution, 4 of the vibration isolation components enclose a square. The 4 vibration isolation components are used to control the acceleration response of the second-order mode and the third-order mode. The second-order mode and the third-order mode involve the bending deformation of the circuit board. The remaining 1 vibration isolation component is located at the geometric center of the square. The remaining 1 vibration isolation component is used to control the acceleration response of the first-order mode. The first-order mode involves the tensile deformation perpendicular to the axial direction of the circuit board.

[0015] As an alternative solution, the circuit board is fixed on the support bottom plate by screws.

[0016] In a second aspect, the present invention provides an electrical equipment box, and the electrical equipment box has the active vibration isolation system for reducing the acceleration response of the circuit board as described above.

[0017] The present invention belongs to the field of aerospace technology. Specifically, it provides an active vibration isolation system and an electrical equipment box for reducing the acceleration response of a circuit board, including a circuit board for carrying electronic components, a support bottom plate for installing the circuit board, and fixing the circuit board on a working surface, a vibration isolation component for generating a damping force to offset the deformation of the circuit board. One end of the vibration isolation component is fixed on the support bottom plate, and the other end abuts against the target position of the circuit board; an acceleration sensor is installed on the circuit board for detecting the acceleration at the target position. In the working state, the acceleration sensor detects the acceleration of the target position, and the vibration isolation component generates a damping force opposite to the acceleration of the target position according to the acceleration, and uses the damping force to suppress the resonance response of the circuit board. The active vibration isolation system provided by the present invention can attenuate the response at the resonance peaks of the 1st to 3rd orders of the circuit board, thereby reducing the response of the circuit board, and thus protecting the electronic components on the circuit board from vibration. Description of the Drawings

[0018] Figure 1This is a schematic structural diagram of an active vibration isolation system for reducing the acceleration response of a circuit board provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic structural diagram of a vibration isolation component in an active vibration isolation system for reducing the acceleration response of a circuit board provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a modal vibration mode in an active vibration isolation system for reducing the acceleration response of a circuit board provided in an embodiment of the present invention.

[0021] Reference numerals: circuit board 1, support bottom plate 2, vibration isolation component 3, acceleration sensor 4. Detailed implementation manners

[0022] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] The terms "first", "second", "third", "fourth", etc. in the specification, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order different from that shown or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0024] Combined with Figure 1 As shown, an active vibration isolation system for reducing the acceleration response of a circuit board provided in an embodiment of the present invention includes:

[0025] A circuit board 1 for carrying electronic components, and the circuit board 1 is the device that needs to be shock-absorbed and protected;

[0026] A support bottom plate 2 for installing the circuit board 1 and fixing the circuit board 1 on a working surface. The working surface can be the surface of a machine or the ground. For the installation method of the support bottom plate 2 and the working surface, bolt fastening connection can be adopted, and no limitation is made thereto;

[0027] The vibration isolation component 3 is used to generate a damping force that counteracts the deformation of the circuit board 1. One end of the vibration isolation component 3 is fixed on the support base plate 2, and the other end of the vibration isolation component 3 abuts against the target position of the circuit board 1. The target position is determined in advance by analyzing the modal vibration modes of the circuit board through finite element analysis software and is obtained based on the maximum response of the vibration mode to be suppressed. The target position is determined according to the modal vibration modes in the simulation results of the circuit board, and the number of target positions is not limited. One end of the vibration isolation component 3 remains stationary, and the other end of the vibration isolation component 3 is a free end that can perform telescopic movements. The specific telescopic movements are determined by the deformation generated by the circuit board 1. The target positions set by the vibration isolation component 3 can be the central area of the circuit board 1 or the support base plate 2, or can be arranged in a uniform distribution to facilitate uniform force application. For the working state of the vibration isolation component 3, specifically, when the circuit board 1 deforms downward, the other end of the vibration isolation component 3 extends upward to generate an upward damping force on the circuit board 1. Conversely, when the circuit board 1 deforms upward, the other end of the vibration isolation component 3 drags downward, so that the circuit board 1 has a downward damping force. The vibration of the circuit board 1 is reduced by the vibration isolation component 3 to protect the electrical components on the circuit board 1. The vibration isolation component 3 can be selected as a voice coil motor, which can reduce the volume of the system and realize the miniaturization of the device;

[0028] The acceleration sensor 4 is installed on the circuit board 1 and is used to detect the acceleration at the target position. The number of acceleration sensors 4 can correspond to the number of vibration isolation components 3, that is, an acceleration sensor 4 is installed at the installation position of each vibration isolation component 3 to facilitate timely detection of the acceleration data at the target position;

[0029] In the working state, the acceleration sensor 4 detects the acceleration at the target position, and the vibration isolation component 3 generates a damping force opposite to the acceleration at the target position according to the acceleration. When multiple vibration isolation components 3 are set, the acceleration collected by the acceleration sensor 4 can be integrated to obtain the velocity at each target position, and the damping force is used to suppress the resonance response of the circuit board 1.

[0030] In the embodiment of the present invention, an active vibration isolation system for reducing the acceleration response of the circuit board 1 includes a circuit board 1 for carrying electronic components, a support base plate 2 for mounting the circuit board 1 and fixing the circuit board 1 on the working surface, and a vibration isolation component 3 for generating a damping force to counteract the deformation of the circuit board 1. One end of the vibration isolation component 3 is fixed on the support base plate 2, and the other end of the vibration isolation component 3 abuts against the target position of the circuit board 1; an acceleration sensor 4 is installed on the circuit board 1 for detecting the acceleration at the target position. In the working state, the acceleration sensor 4 detects the acceleration at the target position, and the vibration isolation component 3 generates a damping force opposite to the acceleration at the target position according to the acceleration, and uses the damping force to suppress the resonance response of the circuit board 1. The active vibration isolation system provided by the present invention can attenuate the response at the 1st to 3rd order resonance peaks of the circuit board 1, thereby reducing the response of the circuit board 1, and thus protecting the electronic components on the circuit board 1 from vibration.

[0031] In this embodiment, the vibration isolation component 3 adopts a voice coil motor. The stator of the voice coil motor is fixed on the support base plate 2, and the mover of the voice coil motor is installed on the circuit board 1. A damping force is applied to the circuit board 1 through the mover. The magnitude of the damping force applied by the mover to the circuit board 1 is determined according to the acceleration at the target position. The specific corresponding relationship can be determined according to empirical values and will not be elaborated here.

[0032] Combined with Figure 2 As shown, in some preferred embodiments, the number of the vibration isolation components 3 is 5. The 5 vibration isolation components 3 can be evenly distributed on the support base plate 2 so that the circuit board 1 is evenly stressed.

[0033] In this embodiment, the 5 vibration isolation components 3 are divided into two groups, which are respectively used to counteract the tensile deformation and bending deformation in the vertical direction. For the group that counteracts the bending deformation of the circuit board 1, 4 vibration isolation components 3 are adopted. Specifically, the 4 vibration isolation components 3 enclose a square. The 4 vibration isolation components 3 are used to control the acceleration response of the second-order mode and the third-order mode, and the second-order mode and the third-order mode involve the bending deformation of the circuit board 1. For the other group that counteracts the tensile deformation in the vertical direction, 1 vibration isolation component 3 is configured. Specifically, the remaining 1 vibration isolation component 3 is located at the geometric center of the square. The remaining 1 vibration isolation component 3 is used to control the acceleration response of the first-order mode, and the first-order mode involves the tensile deformation perpendicular to the axis of the circuit board 1.

[0034] More preferably, the vibration isolation component 3 for counteracting the tensile deformation of the circuit board 1 in the vertical direction is located at the geometric center of the support base plate 2, which also corresponds to the geometric center of the circuit board 1, facilitating the uniform stress of the circuit board 1.

[0035] Combined withFigure 3 As shown, the first-order modal vibration mode diagram, the second-order modal vibration mode diagram, and the third-order modal vibration mode diagram are respectively shown. For the convenience of understanding, the first order, second order, and third order are introduced in detail here. The first-order modal vibration mode corresponds to the first natural frequency. The first order refers to the first mode of the structure, or it can be understood as the lowest natural vibration frequency and vibration mode. The second order and the third order respectively refer to the second-order and third-order modes, which correspond to the cases where i = 2 and 3 in the frequency equation. Specifically, the first-order mode appears when the excitation frequency of the external force is equal to the natural frequency (the first order) of the object. At this time, the vibration form of the object is called the first-order vibration mode or the main vibration mode. The first-order mode appears when the excitation frequency of the external force is equal to the natural frequency of the object. At this time, the vibration form of the object is called the first-order vibration mode or the main vibration mode. The second-order mode appears when the excitation frequency of the external force is twice the natural frequency (the second order) of the object. At this time, the vibration form of the object is called the second-order vibration mode. Each object has its own natural frequency. Under the excitation of the external force, the object will show different vibration characteristics.

[0036] In some embodiments, the circuit board 1 is fixed on the support base plate 2 by screws. In addition to screws, the circuit board 1 can also be fixed on the support base plate 2 by means of snap fasteners or adhesives. Those of ordinary skill in the art can make a flexible choice and are not limited thereto.

[0037] Correspondingly, an electrical equipment box is further provided in an embodiment of the present invention. The electrical equipment box has the active vibration isolation system for reducing the acceleration response of the circuit board 1 as described above.

[0038] The electrical equipment box provided in the embodiment of the present invention includes an active vibration isolation system for reducing the acceleration response of the circuit board 1. The active vibration isolation system includes a circuit board 1 for carrying electronic components, a support base plate 2 for installing the circuit board 1, and fixing the circuit board 1 on the working surface. An isolation component 3 for generating a damping force to counteract the deformation of the circuit board 1. One end of the isolation component 3 is fixed on the support base plate 2, and the other end of the isolation component 3 abuts against the target position of the circuit board 1; an acceleration sensor 4 is installed on the circuit board 1 for detecting the acceleration at the target position. In the working state, the acceleration sensor 4 detects the acceleration at the target position, and the isolation component 3 generates a damping force opposite to the acceleration at the target position according to the acceleration, and uses the damping force to suppress the resonance response of the circuit board 1. The active vibration isolation system provided by the present invention can attenuate the response at the 1st to 3rd order resonance peaks of the circuit board 1, thereby reducing the response of the circuit board 1, and thus protecting the electronic components on the circuit board 1 from vibration.

[0039] It should be understood that the various forms of processes shown above can be used, with steps reordered, added or deleted. For example, the steps described in the present disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and no limitation is imposed herein.

[0040] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An active vibration isolation system for reducing the acceleration response of a circuit board, characterized in that, Comprising: A circuit board for carrying electronic components; A support base plate for mounting the circuit board and fixing the circuit board on a working surface; A vibration isolation assembly for generating a damping force to counteract the deformation of the circuit board. One end of the vibration isolation assembly is fixed on the support base plate, and the other end of the vibration isolation assembly abuts against a target position of the circuit board. The target position is determined in advance by analyzing the modal vibration modes of each order of the circuit board through finite element analysis software and based on the maximum response of the vibration mode to be suppressed; An acceleration sensor mounted on the circuit board for detecting the acceleration at the target position; In a working state, the acceleration sensor detects the acceleration at the target position, and the vibration isolation assembly generates a damping force opposite to the acceleration at the target position according to the acceleration, and uses the damping force to suppress the resonance response of the circuit board.

2. The active vibration isolation system for reducing the acceleration response of the circuit board according to claim 1, wherein The vibration isolation assembly adopts a voice coil motor. The stator of the voice coil motor is fixed on the support base plate, and the mover of the voice coil motor is mounted on the circuit board, and a damping force is applied to the circuit board through the mover.

3. The active vibration isolation system for reducing the acceleration response of the circuit board according to claim 1 or 2, characterized in that, The number of the vibration isolation assemblies is 5.

4. The active vibration isolation system for reducing the acceleration response of a circuit board according to claim 3, wherein The 5 vibration isolation assemblies are evenly distributed on the support base plate.

5. The active vibration isolation system for reducing the acceleration response of the circuit board according to claim 4, wherein Among them, 4 vibration isolation assemblies enclose a square. The 4 vibration isolation assemblies are used to control the acceleration response of the second-order mode and the third-order mode. The second-order mode and the third-order mode involve the bending deformation of the circuit board. The remaining 1 vibration isolation assembly is located at the geometric center of the square. The remaining 1 vibration isolation assembly is used to control the acceleration response of the first-order mode. The first-order mode involves the tensile deformation perpendicular to the axial direction of the circuit board.

6. The active vibration isolation system for reducing the acceleration response of a circuit board according to claim 1, characterized in that The circuit board is fixed on the support base plate by screws.

7. An electrical equipment box, characterized in that, The electrical equipment box has the active vibration isolation system for reducing the acceleration response of the circuit board as described in any one of claims 1 to 6.

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