IMU vibration test support and installation method thereof

Abstract

The invention discloses a vibration test support of an IMU, which belongs to the technical field of IMU measurement and control and comprises a bottom plate, and an adapter plate and a movable baffle which are mounted on the bottom plate and used for compressing and fixing two sides of the IMU, the side faces of the adapter plate and the movable baffle are provided with connecting holes used for being connected with an IMU. The two opposite sides of the bottom plate are provided with an adapter plate installation hole used for installing the adapter plate and a movable baffle installation hole used for installing the movable baffle respectively. The adapter plate is fixed on the bottom plate through the adapter plate mounting hole; and the movable baffle plate can move close to the IMU along the waist-shaped counter bore under the action of the component force of the inclined surface of the inclined surface cushion block, so that the IMU is compressed and fixed between the adapter plate and the movable baffle plate. The invention further discloses an installation method of the vibration test support. The IMU can be stably supported between the adapter plate and the movable baffle, it is guaranteed that the state of an IMU vibration test is consistent with the installation state, and the percent of pass of the IMU vibration test is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of IMU measurement and control, and in particular relates to a vibration test bracket of an IMU and an installation method thereof. Background Art

[0002] IMU (Inertial Measurement Unit) is the core sensitive component of inertial navigation equipment. An IMU generally contains three single-axis accelerometers and three single-axis gyroscopes. The accelerometer detects the acceleration signal of the object in the carrier coordinate system in three independent axes, while the gyroscope detects the angular velocity signal of the carrier relative to the navigation coordinate system, measures the angular velocity and acceleration of the object in three-dimensional space, and calculates the attitude of the object. Therefore, the performance of IMU directly affects the output accuracy of the product.

[0003] In order to ensure that the IMU meets the performance requirements, it is usually necessary to perform a vibration test on it before use. Specifically, the IMU is powered on and the zero bias value of the IMU is continuously tested before, during, and after the vibration test. The zero bias value is one of the important indicators of the gyroscope. When performing vibration tests in the prior art, the method of directly clamping the upper and lower surfaces of the IMU is adopted. After many tests, it is found that when performing vibration tests in this way, the zero bias value of the IMU is prone to deviations, and these deviations will affect the accuracy of attitude solution.

[0004] Therefore, there is currently no vibration test bracket that can meet the vibration test requirements for IMU. How to provide a vibration test bracket that can meet the test requirements is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In response to one or more of the above defects or improvement needs in the prior art, the present invention provides an IMU vibration test bracket and an installation method thereof, which can ensure that the state of the IMU vibration test is consistent with the installation state and improve the pass rate of the IMU vibration test.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided a vibration test bracket for an IMU, comprising a base plate and an adapter plate and a movable baffle installed on the base plate for pressing and fixing both sides of the IMU; The sides of the adapter plate and the movable baffle are both provided with connection holes for connecting the IMU; The bottom plate is provided with an adapter plate mounting hole for mounting the adapter plate and a movable baffle plate mounting hole for mounting the movable baffle plate on opposite sides thereof; The movable baffle mounting hole includes at least two first threaded holes, and the bottom of the movable baffle has protrusions extending outward on both sides, and the protrusions are provided with waist-shaped through holes corresponding to the first threaded holes; the protrusions are provided with an inclined pad, and the contact surfaces of the inclined pad and the protrusion are matching inclined surfaces, and the other surface of the inclined pad is a plane; the middle of the inclined pad is provided with a through hole, and the inclined pad, the movable baffle and the bottom plate are connected by a threaded connector; The adapter plate is fixed on the base plate through the adapter plate mounting hole; the movable baffle can move along the waist-shaped countersunk hole close to the IMU under the action of the inclined surface component of the inclined pad block, so that the IMU is pressed and fixed between the adapter plate and the movable baffle.

[0007] As a further improvement of the present invention, the movable baffle mounting hole further includes at least one waist-shaped countersunk hole arranged between the first threaded holes, and a second threaded hole corresponding to the waist-shaped countersunk hole is arranged at the bottom of the movable baffle.

[0008] As a further improvement of the present invention, the adapter plate mounting hole includes at least two countersunk holes, and the bottom of the adapter plate is provided with a threaded mounting hole corresponding to the countersunk holes, which is used to connect and fix the adapter plate and the base plate through a threaded connector.

[0009] As a further improvement of the present invention, a welding groove is provided on the outer periphery of the bottom of the adapter plate, which is used to weld the adapter plate to the base plate after the adapter plate is connected and fixed to the base plate through a threaded connector.

[0010] As a further improvement of the present invention, a plurality of first IMU connection holes are provided on the side of the adapter plate, and a plurality of second IMU connection holes are provided on the side of the movable baffle plate. Both the first IMU connection holes and the second IMU connection holes are countersunk holes, respectively corresponding to the threaded holes on the IMU, and are used to connect the adapter plate and the movable baffle plate to the IMU.

[0011] As a further improvement of the present invention, The flatness of the side of the adapter plate close to the IMU is not greater than 0.03 mm, the verticality is not greater than 0.05 mm, and the roughness is less than Ra1.6; and / or, The flatness of the side of the movable baffle close to the IMU is not greater than 0.03 mm, the verticality is not greater than 0.05 mm, and the roughness is less than Ra1.6; and / or, The flatness of the bottom surface of the bottom plate is not greater than 0.03 mm, the flatness of the top surface is not greater than 0.03 mm, the parallelism between the top surface and the bottom surface is not greater than 0.05 mm, and the roughness of the top surface and the bottom surface is less than Ra1.6.

[0012] As a further improvement of the present invention, a third threaded hole is provided on the top surface of the movable baffle for fixing a control point during a vibration test.

[0013] As a further improvement of the present invention, wire thread sleeves are embedded in the first threaded hole and the second threaded hole.

[0014] As a further improvement of the present invention, the bottom plate is provided with a plurality of bottom plate mounting holes for connecting to the vibration table.

[0015] According to another aspect of the present invention, a method for installing a vibration test bracket of an IMU is provided, which is used to install the vibration test bracket of the IMU, comprising the following steps: (1) Install the adapter plate on the base plate through the countersunk hole on the base plate, and weld the adapter plate and the base plate to fix them; (2) Process the side of the adapter plate close to the IMU to ensure its flatness and verticality; (3) Connect and fix the adapter plate and IMU through the first IMU connection hole on the side of the adapter plate; (4) Connect the movable baffle to the IMU through the second IMU connection hole on the side of the movable baffle and pre-tighten them; at the same time, pre-tighten the inclined pad to the movable baffle and the bottom plate through the first threaded hole on the bottom plate and the corresponding waist-shaped through hole on the movable baffle; at the same time, pre-tighten the movable baffle and the bottom plate through the waist-shaped countersunk hole on the bottom plate and the corresponding second threaded hole on the movable baffle; (5) Under the action of the inclined surface force of the inclined pad, the movable baffle moves along the waist-shaped countersunk hole and the waist-shaped through hole toward the IMU until it is in close contact with the IMU, and the screws connecting the movable baffle to the IMU and the screws connecting the movable baffle to the bottom plate are tightened alternately to complete the installation of the vibration test bracket.

[0016] In general, the above technical solution conceived by the present invention has the following beneficial effects compared with the prior art: (1) In the vibration test bracket of the IMU of the present invention, the adapter plate is fixedly connected to the base plate and fixes one end of the IMU, and the movable baffle is connected to the base plate through a waist-shaped through hole. Under the action of the inclined component force of the inclined pad, the movable baffle can gradually move along the waist-shaped countersunk hole to approach the IMU, so that the IMU is pressed and fixed between the adapter plate and the movable baffle. Therefore, the present invention can stably support the IMU between the adapter plate and the movable baffle, ensure that the state of the IMU vibration test is consistent with the installation state, and improve the pass rate of the IMU vibration test.

[0017] (2) The vibration test stand of the IMU of the present invention can fit the movable baffle and the IMU together through the provision of the movable baffle, and can adapt to IMU products of different sizes, thereby improving the adaptability of the vibration test stand.

[0018] (3) The installation method of the vibration test bracket of the IMU of the present invention is to first fix one end of the IMU on the adapter plate with screws, and connect the other end of the IMU to the movable baffle, and pre-tighten it with screws; at the same time, the bottom surface of the movable baffle is tightly attached to the bottom plate, and then the two are pre-tightened and fastened by screws through the inclined pad. Under the action of the inclined surface force of the inclined pad, the movable baffle is gradually pushed toward the product until it is tightly attached to the product, and finally the screws for installing the IMU and the screws for installing the movable baffle are alternately tightened until each part is tightened. This installation structure has a significant effect on the vibration test of the IMU and can effectively improve the qualified rate of the vibration test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the vibration test bracket of the IMU according to an embodiment of the present invention; Figure 2 A schematic diagram of the bottom plate structure involved in the vibration test bracket of the IMU according to an embodiment of the present invention; Figure 3 A schematic diagram of the structure of an adapter plate involved in a vibration test bracket of an IMU according to an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a movable baffle plate involved in a vibration test bracket of an IMU according to an embodiment of the present invention; Figure 5 The present invention is a schematic diagram of the inclined pad structure involved in the vibration test bracket of the IMU according to an embodiment of the present invention.

[0020] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. bottom plate; 2. adapter plate; 3. IMU; 4. movable baffle; 5. inclined pad; 11. Bottom plate mounting hole; 12. Countersunk hole; 13. Waist-shaped countersunk hole; 14. First threaded hole; 21. Threaded mounting hole; 22. First IMU connection hole; 23. Welding groove; 24. Notch; 41. Second threaded hole; 42. Waist-shaped through hole; 43. Second IMU connection hole; 44. Third threaded hole; 45. Avoidance groove; 51. Through hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention 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 limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] As a preferred embodiment of the present invention, Figures 1 to 5As shown, the vibration test bracket of the IMU of the embodiment of the present invention is used to support and fix the IMU (inertial measurement unit) when it is subjected to a vibration test. The vibration test bracket includes a base plate 1 and an adapter plate 2 and a movable baffle 4 installed on the base plate 1 for pressing and fixing the two sides of the IMU (inertial measurement unit) 3; the sides of the adapter plate 2 and the movable baffle 4 are provided with connection holes for connecting the IMU; the two opposite sides of the base plate 1 are respectively provided with adapter plate mounting holes for installing the adapter plate 2 and movable baffle mounting holes for installing the movable baffle 4; the adapter plate 2 is fixed on the base plate 1 through the adapter plate mounting holes, and the movable baffle 4 is installed on the base plate 1 through the waist-shaped countersunk hole, and can move along the waist-shaped countersunk hole close to the IMU (inertial measurement unit) 3 to be tightly connected with the IMU.

[0027] Specifically, Figure 2 As shown, the base plate 1 of the embodiment of the present invention serves as a supporting structure, and a plurality of base plate mounting holes 11 are provided in the middle and along the circumferential direction, which are used to connect and fix the base plate 1 and the vibration table in the XYZ directions by screws to realize vibration tests in multiple directions.

[0028] Furthermore, the movable baffle mounting hole includes at least two first threaded holes 14, combined with Figure 3 and Figure 5 , the bottom of the movable baffle 4 has protrusions extending outward on both sides, and the protrusions are provided with waist-shaped through holes 42 corresponding to the first threaded holes 14; the protrusions are provided with inclined pads 5, which are wedge-shaped structures, and the side of the inclined pads 5 that contacts the protrusion of the movable baffle is an inclined surface with the same inclination angle as the protrusion, and the other side of the inclined pads 5 is a plane perpendicular to the side surface. When the inclined pads 5 are installed on the protrusions, the top surface of the inclined pads 5 is horizontal, which is convenient for installation and tightening screws. A through hole 51 is provided in the middle of the inclined pads 5, and the inclined pads 5, the movable baffle 4 and the bottom plate 1 are connected by threaded connectors (such as screws). Under the action of the inclined component force of the inclined pads 5, the movable baffle 4 can gradually move closer to the IMU along the waist-shaped countersunk hole, so that the IMU is pressed and fixed between the adapter plate and the movable baffle.

[0029] In a preferred embodiment, the movable baffle mounting hole further includes at least one waist-shaped countersunk hole 13 disposed between the first threaded holes 14, and a second threaded hole 41 corresponding to the waist-shaped countersunk hole 13 is disposed at the bottom of the movable baffle 4. In the specific embodiment shown in the drawings, two waist-shaped countersunk holes 13 and two second threaded holes 41 are disposed. The waist-shaped countersunk hole 13 needs to be disposed to ensure that the screw is not higher than its mounting surface after being installed.

[0030] In the above preferred embodiment, the middle part of the movable baffle 4 can be further connected to the base plate 1 to enhance the connection stability and avoid resonance during the vibration test. The waist-shaped countersunk hole 13 and the waist-shaped through hole 42 are used for the connection and adjustment of the movable baffle 4, and the threaded hole is used for the connection and fixation with the movable baffle 4. Through the cooperation of the waist-shaped countersunk hole 13 and the waist-shaped through hole 42, the movable baffle 4 can gradually move closer to the IMU under the action of the inclined component of the inclined pad 5, and after the movable baffle 4 and the IMU are fitted and the IMU is pressed between the adapter plate 2 and the movable baffle 4, the movable baffle 4 and the IMU, and the movable baffle 4 and the base plate 1 are fixed.

[0031] Furthermore, the adapter plate mounting hole includes at least two countersunk holes 12, combined with Figure 3 The bottom of the adapter plate 2 is provided with a threaded mounting hole 21 corresponding to the countersunk hole 12, and the adapter plate 2 is installed on the base plate 1 through the threaded mounting hole 21 and the threaded connector (such as a screw) set in the countersunk hole 12. The setting of the countersunk hole 12 must meet the requirement that the screw is not higher than its mounting surface after installation.

[0032] See again Figure 3 The bottom periphery of the adapter plate 2 is provided with a welding groove 23, which is used to weld the adapter plate 2 and the bottom plate 1 together at the welding groove after the adapter plate 2 is connected and fixed to the bottom plate 1 by screws. The welding groove 23 processed at the connection of the present invention is conducive to ensuring the reliability of welding quality. Preferably, the material of the bottom plate 1 and the adapter plate 2 are both made of aluminum plate 5A06 with good welding performance.

[0033] In a preferred embodiment, a plurality of first IMU connection holes 22 are provided on the side of the adapter plate 2, and the first IMU connection holes 22 correspond to the side threaded holes of the IMU near the side of the adapter plate 2, and are used to connect and fix the adapter plate and the IMU by screws. The first IMU connection holes 22 on the adapter plate 2 are all countersunk holes, which can ensure the installation performance requirements and avoid the collision between the IMU and the screws. Similarly, the setting of the countersunk holes must meet the requirement that the screws are not higher than the installation surface after installation.

[0034] In a preferred embodiment, in order to adapt to the outer contour of the IMU, a notch 24 matching the outer contour of the IMU is processed at the lower side of the adapter plate 2 close to the IMU, so as to avoid interference with the IMU during installation.

[0035] More preferably, the adapter plate 2 has an arc-shaped shape to ensure the rigidity of the adapter plate, so as to better complete the experiment. More preferably, in order to avoid the insufficient strength of the vibration test bracket affecting the test results, the adapter plate 2 is preferably not less than 30 mm thick. Too thin thickness will produce resonance and affect the accuracy of the vibration test.

[0036] See again Figure 4The side of the movable baffle 4 is also provided with a plurality of second IMU connection holes 43, which correspond to the side threaded holes of the IMU near the side of the movable baffle 4 and are used to connect and fix the movable baffle 4 and the IMU by screws. Preferably, the second IMU connection holes 43 are also countersunk holes.

[0037] In a preferred embodiment, in order to prevent the screws for installing the vibration table from interfering with this location, an avoidance groove 45 is processed on the outer side of the protruding portion of the movable baffle 4 .

[0038] In a preferred embodiment, a third threaded hole 44 is provided on the top surface of the movable baffle 4 for fixing a control point during a vibration test.

[0039] In the preferred implementation, the flatness of the side of the adapter plate 2 close to the IMU is not greater than 0.03mm, the perpendicularity to the bottom surface is not greater than 0.05mm, and the roughness requirement is less than Ra1.6; the flatness of the side of the movable baffle 4 close to the IMU is required to be no greater than 0.03mm, the perpendicularity to the bottom surface is no greater than 0.05mm, and the roughness requirement is less than Ra1.6; In a preferred embodiment, the bottom surface of the bottom plate 1 is required to have a flatness of no more than 0.03 mm, the top surface is required to have a flatness of no more than 0.03 mm, the top and bottom surfaces are required to have a parallelism of no more than 0.05 mm, and the roughness of the top and bottom surfaces is required to be less than Ra1.6.

[0040] Preferably, since the first threaded hole 14 on the base plate 1 and the second threaded hole 41 at the bottom of the movable baffle 4 are used for connecting and fixing the movable baffle 4 and the base plate 1, they need to be disassembled frequently; and the material of the base plate 1 is preferably aluminum plate 5A06, which is very easy to wear. Therefore, in order to extend the service life of the base plate 1 and the movable baffle 4, wire threaded sleeves are embedded in the first threaded hole 14 and the second threaded hole 41, which can avoid wear of the screws and threaded holes.

[0041] It should be noted that since the countersunk hole 12 on the base plate 1 is used to connect with the adapter plate 2, and the adapter plate 2 is welded after being connected and fixed to the base plate 1, it does not need to be disassembled later. It only needs to ensure that the head of the installed screw is not higher than the installation surface of the base plate.

[0042] Preferably, since the bevel pad 5 needs to have certain strength and wear resistance, the material of the bevel pad 5 is 45 steel and is subjected to quenching and tempering treatment.

[0043] Preferably, the screws that connect the adapter plate 2 and the movable baffle 4 to the IMU need to have high strength requirements, and the material of the screws is preferably round steel 30CrMnSi, which has been quenched and tempered. In addition, the screws need to be checked during the test process, and if they are found to be loose, deformed, cracked, etc., they should be replaced in time.

[0044] Furthermore, the present invention provides a method for installing a vibration test bracket of an IMU, comprising the following steps: (1) Install the adapter plate 2 on the base plate 1 through the countersunk hole 12 on the base plate 1, and weld the adapter plate 2 and the base plate 1 to fix them; (2) After the adapter plate 2 and the base plate 1 are welded, the side of the adapter plate 2 close to the IMU is processed to ensure its flatness and verticality; specifically, the flatness is not greater than 0.03 mm, and the verticality is not greater than 0.05 mm; Since the adapter plate 2 and the base plate 1 are welded and fixed, deformation and stress will be generated during the welding process. Therefore, after the adapter plate 2 and the base plate 1 are welded, the flatness and verticality of the side of the adapter plate are processed to ensure the installation accuracy with the IMU. Since the movable baffle 4 does not need to be welded, the flatness and verticality of the side of the movable baffle 4 are processed when the movable baffle 4 is prefabricated. When the movable baffle 4 is installed, it is ensured that the bottom is flush with the base plate 1.

[0045] (3) Connect and fix the adapter plate 2 and the IMU through the first IMU connection hole 22 on the side of the adapter plate 2; (4) The movable baffle 4 is connected to the IMU through the second IMU connection hole 43 on the side of the movable baffle 4 and pre-tightened; at the same time, the inclined pad 5 is pre-tightened with the movable baffle 4 and the bottom plate 1 through the first threaded hole 14 on the bottom plate 1 and the corresponding waist-shaped through hole 42 on the movable baffle 4; at the same time, the movable baffle 4 and the bottom plate 1 are pre-tightened through the waist-shaped countersunk hole 13 on the bottom plate 1 and the corresponding second threaded hole 41 on the movable baffle 4; (5) Under the action of the inclined surface force of the inclined pad 5, the movable baffle 4 is moved along the waist-shaped countersunk hole 13 and the waist-shaped through hole 42 toward the IMU until it is in close contact with the IMU. The screws connecting the movable baffle 4 and the IMU and the screws connecting the movable baffle 4 and the base plate 1 are tightened alternately to complete the installation of the vibration test bracket of the IMU.

[0046] After the vibration test is completed, first remove the movable baffle 4, and then remove the IMU from the base plate 1 to take out the IMU product.

[0047] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is 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 vibration test stand for an IMU, characterized in that: It includes a bottom plate and an adapter plate and a movable baffle installed on the bottom plate for pressing and fixing two sides of the IMU; The sides of the adapter plate and the movable baffle are both provided with connection holes for connecting the IMU; The bottom plate is provided with an adapter plate mounting hole for mounting the adapter plate and a movable baffle plate mounting hole for mounting the movable baffle plate on opposite sides thereof; The movable baffle mounting hole includes at least two first threaded holes, and the bottom of the movable baffle has protrusions extending outward on both sides, and the protrusions are provided with waist-shaped through holes corresponding to the first threaded holes; the protrusions are provided with an inclined pad, and the contact surfaces of the inclined pad and the protrusion are matching inclined surfaces, and the other surface of the inclined pad is a plane; the middle of the inclined pad is provided with a through hole, and the inclined pad, the movable baffle and the bottom plate are connected by a threaded connector; The adapter plate is fixed on the base plate through the adapter plate mounting hole; the movable baffle can move along the waist-shaped countersunk hole close to the IMU under the action of the inclined surface component of the inclined pad block, so that the IMU is pressed and fixed between the adapter plate and the movable baffle.

2. The vibration test stand of the IMU according to claim 1, characterized in that: The movable baffle mounting hole further comprises at least one waist-shaped countersunk hole arranged between the first threaded holes, and a second threaded hole corresponding to the waist-shaped countersunk hole is arranged at the bottom of the movable baffle.

3. The vibration test stand of the IMU according to claim 1, characterized in that: The adapter plate mounting hole includes at least two countersunk holes, and a threaded mounting hole corresponding to the countersunk holes is provided at the bottom of the adapter plate for connecting and fixing the adapter plate and the base plate through a threaded connector.

4. The vibration test stand of the IMU according to any one of claims 1 to 3, characterized in that: A welding groove is provided on the outer periphery of the bottom of the adapter plate, which is used to weld the adapter plate to the bottom plate after the adapter plate is connected and fixed to the bottom plate through a threaded connector.

5. The vibration test stand of the IMU according to any one of claims 1 to 3, characterized in that: The side of the adapter plate is provided with a plurality of first IMU connection holes, and the side of the movable baffle is provided with a plurality of second IMU connection holes. Both the first IMU connection holes and the second IMU connection holes are countersunk holes, which correspond to the threaded holes on the IMU respectively, and are used to connect the adapter plate and the movable baffle to the IMU.

6. The vibration test bracket of the IMU according to any one of claims 1 to 3, characterized in that: The flatness of the side of the adapter plate close to the IMU is not greater than 0.03 mm, the verticality is not greater than 0.05 mm, and the roughness is less than Ra1.6; and / or, The flatness of the side of the movable baffle close to the IMU is not greater than 0.03 mm, the verticality is not greater than 0.05 mm, and the roughness is less than Ra1.6; and / or, The flatness of the bottom surface of the bottom plate is not greater than 0.03 mm, the flatness of the top surface is not greater than 0.03 mm, the parallelism between the top surface and the bottom surface is not greater than 0.05 mm, and the roughness of the top surface and the bottom surface is less than Ra1.

6.

7. The vibration test stand of the IMU according to any one of claims 1 to 3, characterized in that: The top surface of the movable baffle is provided with a third threaded hole for fixing the control point during vibration test.

8. The vibration test stand of the IMU according to claim 2, characterized in that: The first threaded hole and the second threaded hole are embedded with wire screw sleeves.

9. The vibration test stand of the IMU according to any one of claims 1 to 3, characterized in that: The bottom plate is provided with a plurality of bottom plate mounting holes for connecting the vibration table.

10. A method for installing an IMU vibration test bracket, used for installing the IMU vibration test bracket according to any one of claims 1 to 9, characterized in that: The steps include: (1) Install the adapter plate on the base plate through the countersunk hole on the base plate, and weld the adapter plate and the base plate to fix them; (2) Process the side of the adapter plate close to the IMU to ensure its flatness and verticality; (3) Connect and fix the adapter plate and IMU through the first IMU connection hole on the side of the adapter plate; (4) Connect the movable baffle to the IMU through the second IMU connection hole on the side of the movable baffle and pre-tighten them; at the same time, pre-tighten the inclined pad to the movable baffle and the bottom plate through the first threaded hole on the bottom plate and the corresponding waist-shaped through hole on the movable baffle; at the same time, pre-tighten the movable baffle and the bottom plate through the waist-shaped countersunk hole on the bottom plate and the corresponding second threaded hole on the movable baffle; (5) Under the action of the inclined surface force of the inclined pad, the movable baffle moves along the waist-shaped countersunk hole and the waist-shaped through hole toward the IMU until it is in close contact with the IMU, and the screws connecting the movable baffle to the IMU and the screws connecting the movable baffle to the bottom plate are tightened alternately to complete the installation of the vibration test bracket.

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