A four-mode adaptive switching combined vibration isolation device

Abstract

The present invention discloses a combined vibration isolation device with four-mode adaptive switching, including a controllable damping actuator and a variable stiffness spring assembly; the controllable damping actuator adjusts the damping based on a control signal during operation; the variable stiffness spring assembly includes a main spring and a controllable spring bracket assembly arranged in sequence along the vibration direction, the controllable spring bracket assembly includes a support, a main spring fixing part, a first magnetic body, and a second magnetic body, the support is provided with a slide groove, the main spring fixing part is slidably arranged in the slide groove, and the main spring fixing part is elastically supported by an elastic part, at least one magnetic body is an electromagnet, and the electromagnet adjusts the magnetic field size and direction based on the control signal during operation, thereby adjusting the position of the main spring fixing part, and further adjusting the extension direction and extension amount of the main spring. The advantages of the present invention: the adaptive switching of four modes of active / semi-active / passive / pseudo-active is realized, thereby expanding the effective frequency range of vibration reduction.

Description

Technical Field

[0001] The invention relates to the field of vibration control and isolation devices, and in particular to a four-mode adaptive switching combined vibration isolation device. Background Art

[0002] Shock and vibration exist in all fields and are inevitable, such as: ground vehicles driving on uneven roads, landing impact of aircraft, buildings encountering seismic waves, vibrations generated by mechanical equipment and working instruments, etc. These vibrations / shocks have adverse effects on people's work and life. It is very important to reduce the impact of vibration. In the prior art, vibration reduction systems are usually used to reduce and isolate vibrations. Commonly used vibration reduction systems are divided into passive systems, semi-active systems and active systems. The passive system has a simple structure and low cost, but its own parameters cannot be adjusted, and the vibration reduction effect is only optimal under certain circumstances, so the use scenario is limited. The active system can generate a force that can be adjusted in size and direction, and has good vibration reduction performance. However, the active system is difficult to promote due to factors such as high energy consumption, complex structure and high cost. The semi-active system is between the passive system and the active system. Compared with the passive system, it has the advantages of adjustable parameters and good vibration reduction performance. Compared with the active system, it has the advantages of simple structure, high reliability, low power consumption and low cost, and has broad application prospects.

[0003] However, in the prior art, semi-active systems usually use damping adjustable shock absorbers as semi-active actuators, which can only adjust the damping force, but cannot adjust the spring stiffness. Therefore, the semi-active system can only provide a limited range of controllable mechanical properties in the first and third quadrants of the force-excitation velocity diagram, and cannot achieve the reverse force in the second and fourth quadrants, resulting in the semi-active system being unable to achieve optimal performance in the full frequency range, and the vibration reduction performance is not as good as the active system. By introducing a negative stiffness mechanism into a magnetorheological semi-active suspension, a solution can be provided for improving the vibration reduction performance of the semi-active suspension to the level of an active suspension while avoiding the disadvantages of active control. However, the current introduction method is to simply fix the negative stiffness structure with the actuator, and the existing negative stiffness structure has only a single type of adjustment component, which makes the negative stiffness structure of this structural form have the following defects: first, its negative stiffness characteristics can only be generated within a specific range, and only negative stiffness adjustment can be achieved; second, its active stroke is limited. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a four-mode adaptively switching combined vibration isolation device, so as to be able to adaptively switch between four modes: active / semi-active / passive / pseudo-active, thereby expanding the effective frequency range of vibration reduction.

[0005] The present invention is achieved through the following technical solutions:

[0006] A four-mode adaptive switching combined vibration isolation device comprises a controllable damping actuator and a variable stiffness spring assembly;

[0007] The controllable damping actuator adjusts the damping based on the control signal during operation;

[0008] The variable stiffness spring assembly comprises a main spring and a controllable spring support assembly which are sequentially arranged along the vibration direction, the controllable spring support assembly comprises a support, a main spring fixing part, a first magnetic body, and a second magnetic body, the support is provided with a slide groove extending along the vibration direction, the main spring fixing part is slidably arranged in the slide groove of the support, and an elastic part is arranged between the main spring fixing part and the bottom wall of the slide groove of the support, the main spring fixing part is elastically supported by the elastic part, one end of the main spring fixing part along the vibration direction is provided with a main spring, the other end of the main spring fixing part along the vibration direction is provided with a first magnetic body, the support is provided with a second magnetic body, the magnetic pole distribution directions of the two magnetic bodies are parallel to the vibration direction, at least one of the two magnetic bodies is an electromagnet, and the electromagnet adjusts the size and direction of the magnetic field based on a control signal during operation, thereby realizing the adjustment of the position of the main spring fixing part, and then realizing the adjustment of the extension direction and extension amount of the main spring;

[0009] The movable end of the controllable damping actuator is connected to the first object, the fixed end of the controllable damping actuator is connected to the second object, the main spring of the variable stiffness spring assembly is connected to the first object, and the support of the variable stiffness spring assembly is connected to the second object.

[0010] As a preferred solution of the above-mentioned combined vibration isolation device, the variable stiffness spring assembly and the controllable damping actuator are arranged side by side.

[0011] As a preferred solution of the above-mentioned combined vibration isolation device, the variable stiffness spring assembly and the controllable damping actuator are arranged coaxially along the vibration direction.

[0012] As a preferred embodiment of the above-mentioned combined vibration isolation device, the support of the variable spring assembly is annular in structure, and the support is fixedly mounted on the controllable damping actuator housing through an inner hole, and the annular groove between the support and the controllable damping actuator housing forms the slide groove, and the main spring fixing piece is annular in structure, and the main spring fixing piece is slidably mounted on the controllable damping actuator housing through an inner hole, and the lower section of the main spring is empty on the controllable damping actuator housing.

[0013] As a preferred solution of the above-mentioned combined vibration isolation device, the second magnetic body is arranged on the bottom wall of the slide groove of the support, and the second magnetic body and the first magnetic body are arranged opposite to each other along the vibration direction.

[0014] As a preferred solution of the above-mentioned combined vibration isolation device, the second magnetic body is arranged on the outer side wall of the support.

[0015] As a preferred solution of the above-mentioned combined vibration isolation device, a limiting structure for preventing the main spring fixing piece from falling out is provided at the end of the slide groove of the support.

[0016] As a preferred solution of the above-mentioned combined vibration isolation device, the controllable damping actuator is any one of an electric / magnetorheological shock absorber, an electrically controlled valve shock absorber, an energy feedback shock absorber and a semi-active inertia container.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The present invention provides a four-mode adaptively switchable combined vibration isolation device, which introduces a variable stiffness spring assembly based on a controllable damping actuator. The main spring and the electromagnet are organically combined in the variable stiffness spring assembly. By controlling the size and direction of the magnetic field of the electromagnet, the positive and negative directions of the main spring fixing position are adjusted, and then the expansion and contraction direction and the expansion and contraction amount of the main spring are adjusted, so that the stiffness of the variable stiffness spring assembly can be adjusted within the positive and negative range. According to the real-time situation, the four modes of active / semi-active / passive / pseudo-active can be adaptively switched, thereby expanding the effective frequency range of vibration reduction, improving the controllability of the combined vibration isolation device, and improving the vibration control effect.

[0019] 2. The present invention provides a four-mode adaptive switching combined vibration isolation device, in which the negative stiffness characteristic force generated by the variable stiffness spring assembly is transmitted through the main spring, so the stroke of the controllable damping actuator is not limited and the negative stiffness characteristic can be generated in any range.

[0020] 3. The present invention provides a four-mode adaptive switching combined vibration isolation device, which has a much higher vibration reduction effect than a semi-active system, and has energy consumption and cost comparable to a semi-active system, and works stably and reliably; and compared with a general semi-active system, the vibration isolation effect of the combined vibration isolation device is significantly improved, so that the combined vibration isolation device can be applied to more scenarios, including the vibration isolation of certain items that are sensitive to vibration. The combined vibration isolation device has the advantages of high reliability, simple structure and low energy consumption of a traditional semi-active system, and the advantages of high vibration reduction performance of an active actuator.

[0021] 4. The present invention provides a four-mode adaptively switchable combined vibration isolation device, and a variety of combinations of variable stiffness spring assemblies with different structures and different controllable dampers, so that the structure of the combined vibration isolation device has diversity, thereby expanding the application field of the combined vibration isolation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the variable stiffness spring assembly and the controllable damping actuator of the present invention when they are arranged side by side.

[0023] Figure 2 It is a structural schematic diagram of the variable stiffness spring assembly and the controllable damping actuator of the present invention when they are coaxially arranged along the vibration direction.

[0024] Figure 3 It is a schematic structural diagram of the second magnetic body of the present invention being arranged on the outer side wall of the support.

[0025] Numbers in the figure: 1 controllable damping actuator, 2 variable stiffness spring assembly, 3 first object, 4 second object, 5 main spring, 6 support, 7 main spring fixing member, 8 first magnetic body, 9 second magnetic body, 10 slide groove, 11 elastic member, 12 limiting convex ring, 13 limiting protrusion, 14 controllable damping actuator housing, 15 controllable spring bracket assembly. DETAILED DESCRIPTION

[0026] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0027] See also Figures 1 to 3 This embodiment discloses a four-mode adaptive switching combined vibration isolation device, including a controllable damping actuator 1 and a variable stiffness spring assembly 2.

[0028] The controllable damping actuator 1 adjusts the damping based on the control signal during operation. The movable end of the controllable damping actuator 1 is directly or indirectly connected to the first object 3, and the fixed end of the controllable damping actuator 1 is directly or indirectly connected to the second object 4, so that the controllable damping actuator 1 provides a damping force of controllable size between the first object 3 and the second object 4. The controllable damping actuator 1 can adopt any one of an electric / magnetorheological shock absorber, an electric control valve shock absorber, an energy feedback shock absorber and a semi-active inertia container.

[0029] The variable stiffness spring assembly 2 includes a main spring 5 and a controllable spring support assembly 15 which are arranged in sequence along the vibration direction. The controllable spring support assembly 15 includes a support 6, a main spring fixing part 7, a first magnetic body 8, and a second magnetic body 9. The support 6 is provided with a slide groove 10 extending along the vibration direction. The main spring fixing part 7 is slidably arranged in the slide groove 10 of the support 6, and an elastic part 11 is provided between the main spring fixing part 7 and the bottom wall of the slide groove 10 of the support 6. The main spring fixing part 7 is elastically supported by the elastic part 11, wherein the elastic part 11 can adopt a compression spring or compressed gas. When the elastic part 11 adopts compressed gas, the slide groove 10 of the support 6 needs to be designed as a sealed chamber. A main spring 5 is provided at one end of the main spring fixing part 7 along the vibration direction, a first magnetic body 8 is provided at the other end of the main spring fixing part 7 along the vibration direction, and a second magnetic body 9 is provided on the support 6. The magnetic pole distribution directions of the two magnetic bodies are parallel to the vibration direction. At least one of the two magnetic bodies is an electromagnet. When the electromagnet is in operation, the size and direction of the magnetic field are adjusted based on the control signal, so as to adjust the position of the main spring fixing part 7, and then adjust the extension direction and extension amount of the main spring 5, so as to realize the arbitrary control of the stiffness of the variable stiffness spring assembly 2 within the positive and negative range; the main spring 5 of the variable stiffness spring assembly 2 is directly or indirectly connected to the first object 3, and the support 6 of the variable stiffness spring assembly 2 is directly or indirectly connected to the second object 4, so that the variable stiffness spring assembly 2 provides a controllable elastic force between the first object 3 and the second object 4.

[0030] A limiting structure is provided at the end of the slide groove 10 of the support 6 for preventing the main spring fixing part 7 from falling out. The limiting structure can be a limiting convex ring 12 arranged at the end of the inner wall of the slide groove 10. Correspondingly, a limiting protrusion 13 is provided on the main spring fixing part 7 for blocking and limiting the limiting convex ring 12.

[0031] There are two relative arrangements of the variable stiffness spring assembly 2 and the controllable damping actuator 1:

[0032] The first arrangement is: the variable stiffness spring assembly 2 and the controllable damping actuator 1 are arranged side by side, the two are independent of each other, and are connected to the first object 3 and the second object 4 respectively. Figure 1 .

[0033] The second arrangement is: the variable stiffness spring assembly 2 and the controllable damping actuator 1 are arranged coaxially along the vibration direction. The support 6 of the variable spring assembly is annular in structure, and the support 6 is fixedly sleeved on the controllable damping actuator housing 14 through the inner hole. The annular groove between the support 6 and the controllable damping actuator housing 14 forms a slide groove 10. The main spring fixing part 7 is annular in structure, and the main spring fixing part 7 is slidably sleeved on the controllable damping actuator housing 14 through the inner hole. The lower section of the main spring 5 is hollowly sleeved on the controllable damping actuator housing 14. This arrangement is referred to Figure 2 and Figure 3 This arrangement makes the combined vibration isolation device compact and has a wider range of application scenarios.

[0034] The second magnetic body 9 can be installed in the following two ways:

[0035] The first installation form is: the second magnetic body 9 is arranged on the bottom wall of the slide groove 10 of the support 6, and the second magnetic body 9 and the first magnetic body 8 are arranged opposite to each other along the vibration direction. Figure 1 and Figure 2 .

[0036] The second installation form is: the second magnetic body 9 is arranged on the outer wall of the support 6. Figure 3 .

[0037] There are multiple combinations of the variable stiffness spring assemblies 2 with different structures and different controllable dampers, so that the structure of the combined vibration isolation device has diversity, and the application field of the combined vibration isolation device is expanded.

[0038] The first object 3 and the second object 4 may be two free objects that can move relative to each other along the vibration direction. The combined vibration isolation device can play the function of vibration reduction and vibration isolation between the first object 3 and the second object 4. The first object 3 and the second object 4 may be objects that may vibrate in any scene. For example, in a vehicle, the first object 3 and the second object 4 may be a vehicle chassis and a vehicle body, respectively. For another example, in a bridge system, the first object 3 and the second object 4 may be a beam structure and a column structure, respectively. The vibration direction may be the relative movement direction of the first object 3 and the second object 4 when vibration occurs. For example, in a vehicle, the vibration direction of the vehicle chassis and the vehicle body may be a vertical direction. In some cases, the vibration direction may also be a horizontal direction, an oblique direction, and the like. This embodiment does not limit the vibration direction, and the vibration direction may be any direction.

[0039] like Figure 1As shown, when the combined vibration isolation device is in a balanced position, the main spring 5 and the elastic member 11 are in a compressed state, and the main spring fixing member 7 is at the middle position of its active stroke; at this time, the elastic force generated by the main spring 5 is equal to the resultant force of the elastic force generated by the elastic member 11 and the repulsive force between the first magnetic body 8 and the second magnetic body 9. At this time, the position of the main spring fixing member 7 is changed by controlling the size and direction of the magnetic flux generated by the electromagnet, and the control signal of the controllable damping actuator 1 is used to switch the entire actuator mode. If the controllable damping actuator 1 does not input current, and only controls the electromagnet to input current for control force output, it is an active mode; at this time, the combined vibration isolation device can achieve active force output within a certain range of positive and negative equilibrium position; if the electromagnet inputs a strong current, the two magnetic bodies attract each other or the two magnetic bodies repel each other so that the main spring fixing part 7 stays at the extreme position, and the control force output is output by controlling the controllable damping actuator 1 to input a control current, it is a semi-active mode; the electromagnet inputs a strong current, the two magnetic bodies attract each other or the two magnetic bodies repel each other so that the main spring fixing part 7 stays at the extreme position, and the controllable damping actuator 1 does not input current or inputs a constant current, it is a passive mode; the electromagnet and the controllable damping actuator 1 input control current at the same time, so that the combined vibration isolation device provides a limited range of controllable mechanical properties within the four limits of the force-excitation velocity diagram throughout the entire stroke.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A four-mode adaptive switching combined vibration isolation device, characterized in that: It includes a controllable damping actuator and a variable stiffness spring assembly; The controllable damping actuator adjusts the damping based on the control signal during operation; The variable stiffness spring assembly comprises a main spring and a controllable spring support assembly which are sequentially arranged along the vibration direction, the controllable spring support assembly comprises a support, a main spring fixing part, a first magnetic body, and a second magnetic body, the support is provided with a slide groove extending along the vibration direction, the main spring fixing part is slidably arranged in the slide groove of the support, and an elastic part is arranged between the main spring fixing part and the bottom wall of the slide groove of the support, the main spring fixing part is elastically supported by the elastic part, one end of the main spring fixing part along the vibration direction is provided with a main spring, the other end of the main spring fixing part along the vibration direction is provided with a first magnetic body, the support is provided with a second magnetic body, the magnetic pole distribution directions of the two magnetic bodies are parallel to the vibration direction, at least one of the two magnetic bodies is an electromagnet, and the electromagnet adjusts the size and direction of the magnetic field based on a control signal during operation, thereby realizing the adjustment of the position of the main spring fixing part, and then realizing the adjustment of the extension direction and extension amount of the main spring; The movable end of the controllable damping actuator is connected to the first object, the fixed end of the controllable damping actuator is connected to the second object, the main spring of the variable stiffness spring assembly is connected to the first object, and the support of the variable stiffness spring assembly is connected to the second object.

2. A four-mode adaptive switching combined vibration isolation device as claimed in claim 1, characterized in that: The variable stiffness spring assembly and the controllable damping actuator are arranged side by side.

3. A four-mode adaptive switching combined vibration isolation device as claimed in claim 1, characterized in that: The variable stiffness spring assembly and the controllable damping actuator are coaxially arranged along the vibration direction.

4. A four-mode adaptive switching combined vibration isolation device as claimed in claim 3, characterized in that: The support of the variable spring assembly is an annular structure, and the support is fixedly mounted on the controllable damping actuator housing through an inner hole. The annular groove between the support and the controllable damping actuator housing forms the slide groove. The main spring fixing piece is an annular structure, and the main spring fixing piece is slidably mounted on the controllable damping actuator housing through an inner hole, and the lower section of the main spring is hollowly mounted on the controllable damping actuator housing.

5. A four-mode adaptive switching combined vibration isolation device according to any one of claims 1 to 4, characterized in that: The second magnetic body is arranged on the bottom wall of the slide groove of the support, and the second magnetic body and the first magnetic body are arranged opposite to each other along the vibration direction.

6. A four-mode adaptive switching combined vibration isolation device according to any one of claims 1 to 4, characterized in that: The second magnetic body is arranged on the outer side wall of the support.

7. A four-mode adaptive switching combined vibration isolation device as claimed in claim 1, characterized in that: The end of the slide groove of the support is provided with a limiting structure for preventing the main spring fixing part from falling out.

8. A four-mode adaptive switching combined vibration isolation device as claimed in claim 1, characterized in that: The controllable damping actuator is any one of an electric / magnetorheological shock absorber, an electrically controlled valve shock absorber, an energy feedback shock absorber and a semi-active inertia container.

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