Universal Bipod vibration isolation assembly

Abstract

The invention provides a universal Bipod vibration isolation assembly. The universal Bipod vibration isolation assembly comprises a driving supporting leg, a feedback control device, a spring damping vibration isolator, a passive vibration isolation support, a base, an unlocking gasket and an external cover plate. The bottom of the spring damping vibration isolator is installed in the passive vibration isolation support, the external cover plate is installed on the top of the spring damping vibration isolator, and one or more unlocking gaskets are detachably installed between the external cover plate and the passive vibration isolation support. The two driving supporting legs are installed on the two sides of the passive vibration isolation support respectively, the other ends of the driving supporting legs are installed on the base, and the two feedback control devices are installed on the external cover plate and in the driving supporting legs respectively in the axial direction of the two driving supporting legs. Two-degree-of-freedom vibration isolation can be achieved by connecting the dual-drive supporting legs with the spring damping vibration isolators in series; a plurality of vibration feedback control modes are provided through the combination of a force sensor and an accelerometer; the vibration isolation assembly has two vibration isolation states through the unlocking gasket, the requirement for installation precision is low, and the space occupancy rate is small.

Description

Technical Field

[0001] The invention relates to the technical field of vibration control, in particular to a universal Bipod vibration isolation component. Background Art

[0002] The space and mass resources of spacecraft are very limited. How to design vibration isolators using the smallest space and lightest mass to adapt to different vibration isolation objects has become the primary consideration in the design of spacecraft vibration isolation devices.

[0003] In the Chinese invention patent documents with announcement numbers CN2924161Y, CN104033539, CN103244601, CN102748425, CN105485246, CN105129112, and 106678241, a variety of active and passive integrated vibration isolation devices are introduced, including electromagnetic-rubber type, electromagnetic spring type, electromagnetic-airbag type, piezoelectric-electromagnetic damping type, piezoelectric-disc spring type, etc. These vibration isolation devices are all single-leg integrated designs, with only single-degree-of-freedom active and passive vibration isolation functions, and no integrated sensors that can be used for monitoring and feedback, and only one vibration isolation state.

[0004] In the Chinese invention patent document with the announcement number CN207051570, an adjustable reflector Bipod flexible support structure and support device are introduced. The device can realize posture adjustment but has no vibration isolation function.

[0005] In the Chinese invention patent document with the announcement number CN106184827, an active-passive integrated whole-satellite vibration isolation device is introduced. Eight actuators are installed at eight positions of the satellite-rocket connection adapter, with many installation positions and high assembly precision requirements.

[0006] At present, the active and passive integrated vibration isolation device uses an integrated single-leg design and only has single-degree-of-freedom active and passive vibration isolation functions; sensors that can be used for monitoring and feedback are not integrated; when multiple devices are used in series or parallel, the space occupancy rate is large and the installation precision requirements are extremely high.

[0007] Therefore, the inventors believe that it is necessary to provide a universal Bipod vibration isolation assembly that can achieve vibration isolation functions in more than one degree of freedom, and provide a variety of vibration feedback control options, with multiple vibration isolation states, low installation precision requirements, small space occupancy, and wide versatility. Summary of the invention

[0008] In view of the defects in the prior art, an object of the present invention is to provide a universal Bipod vibration isolation assembly.

[0009] A universal Bipod vibration isolation assembly provided according to the present invention comprises: a driving leg, a feedback control device, a spring damping vibration isolator, a passive vibration isolation bracket, a base, an unlocking gasket and an external cover plate;

[0010] The bottom of the spring damping vibration isolator is installed in the passive vibration isolation bracket, the external cover plate is installed on the top of the spring damping vibration isolator, and one or more unlocking gaskets are detachably installed between the external cover plate and the passive vibration isolation bracket;

[0011] The two driving legs are respectively installed on both sides of the passive vibration isolation bracket, the other end of the driving leg is installed on the base, and the two sets of feedback control devices are respectively installed on the external cover plate and in the driving legs along the axial direction of the two driving legs.

[0012] Preferably, the two driving legs are symmetrically and obliquely installed on both sides of the passive vibration isolation bracket.

[0013] Preferably, the angle between the axial direction of the driving leg and the vertical direction is in the range of 37.5° to 45°.

[0014] Preferably, the driving leg comprises an upper flexible hinge, a force sensor, a piezoelectric stack and a lower flexible hinge which are sequentially arranged in series; the upper flexible hinge is connected to the passive vibration isolation bracket to form a revolving pair; and the lower flexible hinge is connected to the triangular support to form a revolving pair.

[0015] Preferably, two triangular supports are provided on the base, and the two driving legs are respectively mounted on the two triangular supports, and the axial direction of the driving legs is perpendicular to the mounting surface of the triangular supports.

[0016] Preferably, the spring damping vibration isolator comprises a slotted spring and a liquid damper, and the slotted spring and the liquid damper are fixedly connected by screws.

[0017] Preferably, the feedback control device comprises an accelerometer and a force sensor, and the accelerometer cooperates with the force sensor to form a combined feedback control, including pure force feedback, pure acceleration feedback, and combined force and acceleration feedback.

[0018] Preferably, the accelerometer is mounted on the external cover plate via an acceleration base, the acceleration base is triangular, and the axial direction of the accelerometer is perpendicular to the mounting surface of the acceleration base.

[0019] Preferably, it also includes a limiting device, which includes a limiting support and a limiting screw. The limiting support is installed on the base, and two limiting screws are installed on both sides of the top of the limiting support. The limiting support and the limiting screw cooperate to form a three-degree-of-freedom limit.

[0020] Preferably, when the four unlocking washers are fastened and installed between the external cover plate and the passive vibration isolation support by screws, the universal Bipod vibration isolation assembly is in an active vibration isolation state;

[0021] When the four unlocking gaskets are removed, the universal Bipod vibration isolation assembly is in an active-passive composite vibration isolation state.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention can achieve two-degree-of-freedom vibration isolation through the design of a double-drive leg series spring damping vibration isolator; provide a variety of vibration feedback control mode options through the combined design of a force sensor and an accelerometer; through the use of an unlocking gasket, the vibration isolation component has two vibration isolation states of pure active and active-passive composite; through the integration of active and passive vibration isolation devices, combined with force and acceleration measurement, the control mode is adaptively selected, the output stiffness and damping are variable, the vibration isolation frequency is widened, and it can be applied to the vibration isolation system in different quantities, with low installation precision requirements and small space occupancy, so that the Bipod vibration isolation component has wide versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a universal Bipod vibration isolation assembly mainly embodied in the present invention;

[0026] Figure 2 It is a front view of a general Bipod vibration isolation assembly mainly embodied in the present invention;

[0027] Figure 3 The present invention mainly embodies Figure 2 Sectional view along the AA direction;

[0028] Figure 4 This is a schematic diagram of the sensor combination feedback control principle of the present invention;

[0029] Figure 5 The present invention mainly embodies the arrangement of three sets of universal Bipod vibration isolation components;

[0030] Figure 6 The present invention mainly embodies the arrangement of four sets of universal Bipod vibration isolation components.

[0031] As shown in the figure:

[0032] Upper flexure hinge 1 Force sensor 2 Piezoelectric stack 3

[0033] Lower flexible hinge 4 Passive vibration isolation bracket 5 Limit support 6

[0034] Base 7 Triangular support 8 Acceleration base 9

[0035] Accelerometer 10 Unlocking washer 11 Limit screw 12

[0036] External cover 13 Slotted spring 14 Liquid damper 15 DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0038] like Figure 1-3 As shown, a universal Bipod vibration isolation assembly provided according to the present invention includes: a driving leg, a feedback control device, a spring damping vibration isolator, a passive vibration isolation bracket 5, a base 7, an unlocking gasket 11 and an external cover plate 13; the bottom of the spring damping vibration isolator is installed in the passive vibration isolation bracket 5, the external cover plate 13 is installed on the top of the spring damping vibration isolator, and one or more unlocking gaskets 11 are detachably installed between the external cover plate 13 and the passive vibration isolation bracket 5; two driving legs are respectively installed on both sides of the passive vibration isolation bracket 5, and the other end of the driving legs is installed on the base 7, and two sets of feedback control devices are respectively installed on the external cover plate 13 and in the driving legs along the axial direction of the two driving legs.

[0039] The two driving legs are symmetrically and obliquely installed on both sides of the passive vibration isolation bracket 5. The angle between the axial direction of the driving legs and the vertical direction ranges from 37.5° to 45°.

[0040] The driving leg includes an upper flexible hinge 1, a force sensor 2, a piezoelectric stack 3, and a lower flexible hinge 4 which are sequentially arranged in series. The upper flexible hinge 1 is connected to the passive vibration isolation bracket 5 to form a revolute pair, and the lower flexible hinge 4 is connected to the triangular support 8 to form a revolute pair. The upper flexible hinge 1 and the lower flexible hinge 4 are respectively installed on the passive vibration isolation bracket 5 and the triangular support 8 to release the rotational freedom at the connection, prevent the piezoelectric stack from being damaged due to stress concentration, and cooperate with the piezoelectric stack to realize the two-degree-of-freedom vibration isolation function.

[0041] Two triangular supports 8 are arranged on the base 7 , and two driving legs are respectively mounted on the two triangular supports 8 , and the axial direction of the driving legs is perpendicular to the mounting surface of the triangular supports 8 .

[0042] The spring damping vibration isolator comprises a slotted spring 14 and a liquid damper 15, which are fixedly connected by screws. The slotted spring 14 provides passive vibration isolation stiffness and support stiffness for the Bipod vibration isolation assembly, and the liquid damper 15 provides attenuation damping for passive vibration isolation.

[0043] The feedback control device includes an accelerometer 10 and a force sensor 2. The accelerometer 10 cooperates with the force sensor 2 to realize vibration signal monitoring and combined feedback control, including pure force feedback, pure acceleration feedback, and force and acceleration comprehensive feedback. Different feedback control methods are mainly selected according to the vibration characteristics of the vibration isolation object.

[0044] The accelerometer 10 is mounted on the external cover plate 13 along the axial direction of the driving leg through the acceleration base 9 . The acceleration base 9 is triangular in shape, and the axial direction of the accelerometer 10 is perpendicular to the mounting surface of the acceleration base 9 .

[0045] It also includes a limiting device, which includes a limiting support 6 and a limiting screw 12. The limiting support 6 is installed on the base 7, mainly limiting the movement of the Bipod vibration isolation component in the Y direction. Two limiting screws 12 are installed on both sides of the top of the limiting support 6 to limit the movement of the passive vibration isolation bracket in the X and Z directions. The limiting support 6 and the limiting screw 12 cooperate to achieve the three-degree-of-freedom limitation of the Bipod and realize the mechanical protection function of the Bipod.

[0046] The unlocking gasket 11 mainly realizes two vibration isolation states of the Bipod vibration isolation assembly: active vibration isolation and active-passive composite vibration isolation. When the four unlocking gaskets 11 are fastened and installed between the external cover plate 13 and the passive vibration isolation support 5 by screws, the universal Bipod vibration isolation assembly is in the active vibration isolation state; when the four unlocking gaskets 11 are removed, the universal Bipod vibration isolation assembly is in the active-passive composite vibration isolation state.

[0047] When the Bipod vibration isolation assembly is in the active and passive composite vibration isolation state, the spring damping vibration isolator provides the passive vibration isolation function. The spring damping vibration isolator is connected in series with the driving leg. Since the stiffness of the piezoelectric stack in the driving leg is much greater than the stiffness of the spring damping vibration isolator, the stiffness of the Bipod vibration isolation assembly is mainly provided by the spring damping vibration isolator.

[0048] like Figure 4 As shown, when the Bipod vibration isolation assembly is subjected to micro-vibration disturbance, the two force sensors 2 and the accelerometer 10 respectively monitor the micro-vibration response of the load in real time, and the output is fed back to the control link after signal processing. The control link uses a specific vibration control algorithm to drive the two actuating legs to output actuating force according to the vibration characteristics, thereby isolating the vibration transmitted to the load.

[0049] like Figure 5 and 6As shown in the figure, when Bipod vibration isolation components are used, the number of Bipod vibration isolation components can be determined according to the geometric mass characteristics of the load and the requirements for micro-vibration isolation. Three sets of Bipod vibration isolation components can achieve six-degree-of-freedom vibration isolation of the load. Four sets of Bipod vibration isolation components have redundancy features and can maintain the multi-degree-of-freedom vibration isolation working mode when a single leg fails. At the same time, the highly integrated Bipod vibration isolation components simplify the assembly connection with the load.

[0050] This application can achieve two-degree-of-freedom vibration isolation through the design of a dual-drive leg series spring damping isolator; through the combined design of the force sensor 2 and the accelerometer 10, a variety of vibration feedback control methods are provided; through the use of the unlocking gasket 11, the vibration isolation component has two vibration isolation states: pure active and active-passive composite. This application integrates active and passive vibration isolation devices, combines force and acceleration measurement, adaptively selects control methods, outputs variable stiffness and damping, broadens the vibration isolation frequency, and can be applied to the vibration isolation system in different quantities. It has low installation precision requirements and small space occupancy, making the Bipod vibration isolation component widely applicable.

[0051] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A universal Bipod vibration isolation assembly, characterized in that: include: A driving leg, a feedback control device, a spring damping vibration isolator, a passive vibration isolation bracket (5), a base (7), an unlocking gasket (11) and an external cover plate (13); The bottom of the spring damping vibration isolator is installed in the passive vibration isolation bracket (5), the external cover plate (13) is installed on the top of the spring damping vibration isolator, and one or more unlocking gaskets (11) are detachably installed between the external cover plate (13) and the passive vibration isolation bracket (5); The two driving legs are respectively mounted on both sides of the passive vibration isolation bracket (5), the other end of the driving leg is mounted on the base (7), and the two sets of feedback control devices are respectively mounted on the external cover plate (13) and inside the driving legs along the axial direction of the two driving legs.

2. The universal Bipod vibration isolation assembly according to claim 1, characterized in that: The two driving legs are symmetrically and obliquely mounted on both sides of the passive vibration isolation bracket (5).

3. The universal Bipod vibration isolation assembly according to claim 2, characterized in that: The angle between the axial direction of the driving leg and the vertical direction is in the range of 37.5° to 45°.

4. The universal Bipod vibration isolation assembly according to claim 1, characterized in that: The driving leg comprises an upper flexible hinge (1), a force sensor (2), a piezoelectric stack (3), and a lower flexible hinge (4) which are sequentially arranged in series; the upper flexible hinge (1) is connected to the passive vibration isolation bracket (5) to form a rotating pair; and the lower flexible hinge (4) is connected to the triangular support (8) to form a rotating pair.

5. The universal Bipod vibration isolation assembly according to claim 1, characterized in that: Two triangular supports (8) are arranged on the base (7), and the two driving legs are respectively mounted on the two triangular supports (8), and the axial direction of the driving legs is perpendicular to the mounting surface of the triangular supports (8).

6. The universal Bipod vibration isolation assembly of claim 1, wherein: The spring damping vibration isolator comprises a slotted spring (14) and a liquid damper (15), and the slotted spring (14) and the liquid damper (15) are fixedly connected by screws.

7. The universal Bipod vibration isolation assembly of claim 4, wherein: The feedback control device comprises an accelerometer (10) and a force sensor (2). The accelerometer (10) cooperates with the force sensor (2) to form a combined feedback control, including pure force feedback, pure acceleration feedback, and combined force and acceleration feedback.

8. The universal Bipod vibration isolation assembly according to claim 7, characterized in that: The accelerometer (10) is mounted on the external cover plate (13) via an acceleration base (9); the acceleration base (9) is triangular in shape; and the axial direction of the accelerometer (10) is perpendicular to the mounting surface of the acceleration base (9).

9. The universal Bipod vibration isolation assembly of claim 1, wherein: It also includes a limiting device, which includes a limiting support (6) and a limiting screw (12). The limiting support (6) is installed on the base (7), and two limiting screws (12) are installed on both sides of the top of the limiting support (6). The limiting support (6) and the limiting screw (12) cooperate to form a three-degree-of-freedom limit.

10. The universal Bipod vibration isolation assembly of claim 1, wherein: When the four unlocking gaskets (11) are fastened and installed between the external cover plate (13) and the passive vibration isolation support (5) by means of screws, the universal Bipod vibration isolation assembly is in an active vibration isolation state; When the four unlocking gaskets (11) are removed, the universal Bipod vibration isolation assembly is in an active-passive composite vibration isolation state.

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