Angular vibration test device

Abstract

The utility model discloses an angular vibration test device which comprises at least one of a vertical test mechanism and a horizontal test mechanism. The vertical test mechanism is used for loading angular vibration excitation in pitching and rolling directions on the to-be-tested workpiece, the pitching direction is a motion direction rotating around a transverse axis X, and the rolling direction is a motion direction rotating around a longitudinal axis Y; and the horizontal test mechanism is used for loading angular vibration excitation in the yaw direction on the workpiece to be tested, and the yaw direction is the motion direction rotating around the vertical axis Z. The angular vibration test device disclosed by the utility model is scientific in design, can realize single-degree-of-freedom pure angular vibration excitation loading, solves the problem that the existing rotary table cannot simulate a high-frequency angular vibration environment, and has great practical significance.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration testing, in particular to an angular vibration testing device. Background Art

[0002] The inertial group subsystem is composed of an inertial group, a shock absorber and an inertial group mounting base. The angular vibration transfer characteristics of the inertial group subsystem are important parameters in the design of the aircraft control system. Obtaining the angular vibration transfer characteristics through angular vibration tests is an important means to ensure the stability of the attitude control system. It should be noted that angular vibration is rotational vibration or torsional vibration, which is described by angular displacement, angular velocity and angular acceleration, and the corresponding load is moment or torque.

[0003] In the inertial group small system, the inertial group is the laser inertial group. As the measurement unit of the inertial navigation system, the laser inertial group measures the acceleration and angular velocity of the vehicle's motion through inertial measurement devices such as gyroscopes and accelerometers. The inertial group is installed on the base through a vibration absorber to achieve the vibration reduction function of the inertial group instruments.

[0004] At present, the angular vibration test loading of the small inertial group system is mainly carried out by using a turntable or a three-axis six-degree-of-freedom table. However, due to the low bandwidth of the turntable, it cannot simulate the high-frequency angular vibration environment.

[0005] In addition, for a three-axis six-degree-of-freedom stage, there is often a superposition of angular vibrations and linear vibrations in multiple directions under high-frequency conditions, resulting in poor loading purity and measurement accuracy of the angular vibration.

[0006] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Utility Model Content

[0007] The utility model aims to provide an angular vibration test device in view of the technical defects in the prior art.

[0008] To this end, the utility model provides an angular vibration test device, including at least one of a vertical test mechanism and a horizontal test mechanism;

[0009] The vertical test mechanism is used to load the test workpiece with angular vibration excitation in the pitch and roll directions. The pitch direction is the direction of rotation around the horizontal axis X, and the roll direction is the direction of rotation around the vertical axis Y.

[0010] The horizontal test mechanism is used to load the test workpiece with angular vibration excitation in the yaw direction, where the yaw direction is the direction of movement rotating around the vertical axis Z.

[0011] It can be seen from the technical solution provided by the above utility model that, compared with the prior art, the utility model provides an angular vibration test device, which is scientifically designed and can realize single-degree-of-freedom pure angular vibration excitation loading, solving the problem that the existing turntable cannot simulate high-frequency angular vibration environment, and has great practical significance.

[0012] In addition, the application of the utility model is also conducive to solving the problems of poor angular vibration purity and measurement accuracy existing in the existing three-axis six-degree-of-freedom platform.

[0013] The utility model is a single-axis angular vibration test device applicable to workpieces such as an inertial group small system. By applying the utility model, the loading purity of the angular vibration test can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the position state of an angular vibration test device provided by the utility model when a vertical test is required;

[0015] Figure 2 A schematic diagram of the position state of an angular vibration test device provided by the utility model when a horizontal test is required;

[0016] Figure 3 The three-dimensional structure diagram of the inertial group small system as the workpiece to be tested;

[0017] Figure 4 This is a schematic diagram of the structure of an angular vibration test device provided by the utility model, on which an inertial group small system is installed and a vertical test is performed;

[0018] Figure 5 This is a schematic diagram of the structure of an angular vibration test device provided by the utility model, on which an inertial group small system is installed and a horizontal test is performed;

[0019] Figure 6 A schematic diagram of the three-dimensional structure of a horizontal test table in an angular vibration test device provided by the utility model;

[0020] Figure 7 A schematic structural diagram of a liquid hydrostatic bearing of an embodiment of an angular vibration test device provided by the utility model;

[0021] In the figure, 1 is a vibration table; 2 is a dynamic coil connector; 3 is a hydraulic ball head decoupling device; 4 is a vertical test table; 5 is the first static pressure bearing;

[0022] 6—bearing mounting base; 7—support frame; 8—mounting plate; 9—horizontal test table; 10—liquid hydrostatic bearing; 11—support seat. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 a limitation on the present invention.

[0025] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0026] 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 one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] See also Figures 1 to 7 , the utility model provides an angular vibration test device, including: at least one of a vertical test mechanism and a horizontal test mechanism;

[0028] The vertical test mechanism is used to load the test workpiece with angular vibration excitation in the pitch and roll directions. The pitch direction is the direction of rotation around the horizontal axis X, and the roll direction is the direction of rotation around the vertical axis Y.

[0029] The horizontal test mechanism is used to load the test workpiece with angular vibration excitation in the yaw direction, where the yaw direction is the direction of movement rotating around the vertical axis Z.

[0030] It should be noted that see Figure 4 , Figure 5 As shown, the x-axis (horizontal axis) direction: represents horizontal movement or position. The y-axis (vertical axis): represents longitudinal movement or position. The z-axis (vertical axis): in three-dimensional space, perpendicular to the x-axis and y-axis, represents vertical movement or position.

[0031] In the present invention, the yaw motion is a motion of rotation around the vertical axis Z; the pitch motion is a motion of rotation around the horizontal axis X; and the roll motion is a motion of rotation of the platform around the longitudinal axis.

[0032] It should be noted that, in the present invention, both the vertical test mechanism and the horizontal test mechanism apply angular vibration excitation, the only difference being the direction of the excitation. The vertical test mechanism can realize angular vibration excitation in the pitch and roll directions of the test piece, while the horizontal test mechanism can realize yaw direction excitation of the test piece.

[0033] In this utility model, see Figure 1 As shown, the vertical test mechanism includes: a vibration table 1, a moving coil connector 2, a hydraulic ball head decoupling device 3, a vertical test table 4, a first static pressure bearing 5, a bearing mounting base 6, a support frame 7 and a mounting plate 8;

[0034] A vibration table 1 is provided on the top of the horizontally distributed mounting plate 8;

[0035] The vibration table 1 has a vertically distributed vibration table body 100 (the vibration table body is a self-contained component on the vibration table 1) on the top, and a vibration table moving coil is arranged;

[0036] A support frame 7 is provided on the top of the vibration table 1;

[0037] Two bearing mounting bases 6 are provided on the top rear side of the support stand 7;

[0038] The two bearing mounting bases 6 are symmetrically distributed on the left and right;

[0039] A first static pressure bearing 5 is respectively arranged on each bearing mounting base 6;

[0040] The first hydrostatic bearing 5 is fixedly connected to the bottom of the vertical test table 4;

[0041] The vibration table moving coil on the vibration table body 100 is connected to one end of the moving coil connecting member 2 distributed vertically;

[0042] The other end of the moving coil connector 2 is connected to one end of the hydraulic ball head decoupling device 3;

[0043] The other end of the hydraulic ball head decoupling device 3 is fixedly connected to the bottom surface of the vertical test bench 4;

[0044] The top of the vertical test table 4 is used to install the workpiece that needs to be tested for angular vibration (i.e., the workpiece to be tested, such as the inertial group small system 12);

[0045] See also Figure 3 As shown, the inertial group subsystem 12 includes an inertial group 121, a shock absorber 122 and an inertial group mounting base 123;

[0046] An inertial group 121 is disposed at the top middle position of the inertial group mounting base 123;

[0047] Two shock absorbers 122 are respectively disposed on the left and right sides of the inertia group 121 .

[0048] It should be noted that the inertial group small system 12 is only a working object for applying angular vibration in the present invention, and will not be described in detail here.

[0049] In specific implementation, a hollow platform accommodating inner cavity 101 is provided on the vibration platform 1;

[0050] The vibration table body 100 is arranged in the table body accommodating inner cavity 101;

[0051] It should be noted that the right side and top opening of the platform housing the inner cavity 101;

[0052] In specific implementation, a vertically penetrating notch 700 is provided at the front end of the support stand 7;

[0053] The dynamic connecting member 2 vertically passes through the notch 700 .

[0054] In a specific implementation, the mounting plate 8 is fixedly connected to the external ground rail platform for supporting and fixing the vibration table.

[0055] In a specific implementation, the vibration table 1 is fixed on the mounting plate 8 by means of bolts.

[0056] It should be noted that the support frame 7 is fixed on the frame on the top of the vibration table 1 and is used to install the bearing mounting base 6.

[0057] In a specific implementation, the support frame 7 is rigidly fixed on the top frame of the vibration table 1 by bolts.

[0058] In specific implementation, the dynamic coil connector 2 is an extended cylindrical structure;

[0059] In specific implementation, one end of the dynamic coil connector 2 is fixedly connected to the dynamic coil of the vibration table 1 through bolts, and the other end is fixedly connected to the hydraulic ball head decoupling device 3 through bolts.

[0060] It should be noted that, for the present invention, the dynamic coil connector 2 is mainly used to connect the hydraulic ball head decoupling device 3 and the dynamic coil of the vibration table, and transmit the excitation along the axial direction of the dynamic coil connector 2. The function of the hydraulic ball head decoupling device 3 is: as a mechanical decoupling device connecting the vibration table 1 and the test table 4, it adopts a static pressure support double ball head structure to achieve the decoupling of translation and rotation.

[0061] In specific implementation, the vertical test table 4 is cast from hard aluminum and has a honeycomb-type reinforcing rib structure to ensure the strength and rigidity of the vertical test table.

[0062] In specific implementation, the rotating shaft of the first hydrostatic bearing 5 is fixed on the bearing mounting base 6;

[0063] Furthermore, the rotating shaft of the first hydrostatic bearing 5 is rigidly fixed on the bearing mounting base 6 through threaded holes at both ends of the rotating shaft (the bearing mounting base 6 is correspondingly provided with threaded connection holes, which are connected to the rotating shaft by screws);

[0064] The rotating bearing portion of the first static pressure bearing 5 penetrates into the rotating shaft;

[0065] There is an oil film between the rotating bearing and the rotating shaft, which allows the rotating bearing to rotate freely around the rotating shaft;

[0066] The upper end of the rotating bearing part of the first static pressure bearing 5 is fixedly connected to the vertical test table 4 .

[0067] It should be noted that, in the present invention, two first hydrostatic bearings 5 ​​are installed at the bottom of the vertical test table 4. The two first hydrostatic bearings 5 ​​can enable the vertical test table 4 to rotate around the bearing's axis of rotation (i.e., the axis of rotation of the first hydrostatic bearing 5) under the vertical excitation loaded by the vibration table moving coil on the vibration table body 100.

[0068] In this utility model, see Figure 2 As shown, the horizontal test mechanism includes a vibration table 1, a moving coil connector 2, a hydraulic ball head decoupling device 3, a horizontal test table surface 9, a liquid static pressure bearing 10 and a support seat 11;

[0069] A vibration table 1 is provided on the top of the horizontally distributed mounting plate 8;

[0070] The vibration table 1 has a vibration table body 100, on the right side end surface of which a vibration table moving coil 102 is provided;

[0071] The vibration table dynamic coil 102 is connected to one end of the horizontally distributed dynamic coil connector 2;

[0072] The other end of the moving coil connector 2 is connected to one end of the hydraulic ball head decoupling device 3;

[0073] The other end of the hydraulic ball head decoupling device is connected to a rotating arm 900 arranged on the outer side of a horizontal test table 9;

[0074] The top of the horizontal test table 9 is used to install the workpiece that needs to be tested for angular vibration (i.e., the workpiece to be tested, such as the inertial group small system 12);

[0075] It should be noted that the bottom (i.e., the axial bottom) of the test piece (such as the inertial group subsystem 12) is fixed to the top of the horizontal test table 9, and the axial direction of the test piece is perpendicular to the top surface of the horizontal test table 9 distributed horizontally.

[0076] The bottom of the horizontal test table 9 is fixedly connected to the top of the support seat 11 through a liquid hydrostatic bearing 10;

[0077] The bottom of the support base 11 is arranged on the top of the horizontally distributed mounting plate 8 .

[0078] It should be noted that, for the vibration table 1, the vibration table body 100 can be turned to be distributed in a horizontal direction through the electric steering mechanism provided thereon.

[0079] In a specific implementation, the other end of the hydraulic ball head decoupling device is fixedly connected to the rotating arm 900 of the horizontal test bench 9 by eight bolts (ie, threaded fixed connection).

[0080] It should be noted that the rotating arm 900 is a part of the structure of the horizontal test table 9 itself. Figure 6 shown.

[0081] In specific implementation, the bottom of the liquid hydrostatic bearing 10 is rigidly fixed on the mounting plate 8 through the support seat 11 .

[0082] In specific implementation, the liquid hydrostatic bearing 10 includes: a table hydrostatic support 1001 and a rotating shaft hydrostatic support 1002;

[0083] The rotating shaft static pressure support 1002 is located inside the table static pressure support 1001;

[0084] The top of the rotating shaft static pressure support 1002 is connected to the bottom of the horizontal test table 9;

[0085] The bottom of the table top static pressure support 1001 is connected to the top of the support seat 11.

[0086] It should be noted that the table top static pressure support uses the pressure oil film to provide axial support for supporting the vertical load of the table top, while ensuring that the table top will not move in the vertical direction. The rotating shaft static pressure support uses the pressure oil film to provide radial support to ensure the horizontal test table top 9 to rotate around the axis. The rotating shaft static pressure support can perform horizontal rotation in the table top static pressure support, that is, the rotating shaft static pressure support and the table top static pressure support are pivotally connected.

[0087] It should be noted that see Figure 7 As shown, the liquid hydrostatic bearing 10 includes a table top hydrostatic support 1001, and the upper and lower surfaces of the table top hydrostatic support 1001 are designed with a flat hydrostatic cabin to form an oil film for supporting the vertical load of the table top. The liquid hydrostatic bearing 10 includes a rotating shaft hydrostatic support 1002, and the rotating shaft hydrostatic support and the cylinder body 1003 form an environmental hydrostatic cabin. The table top hydrostatic support 1001 and the rotating shaft hydrostatic support 1002 ensure the rotational movement of the horizontal test table 9. The liquid hydrostatic bearing is a bearing module with mature prior art, and its structure is a well-known prior art, which will not be described in detail here.

[0088] See also Figure 2 As shown, in a specific implementation, a hollow platform body accommodating inner cavity 101 is provided on the vibration table 1;

[0089] The vibration table body 100 is arranged in the table body accommodating inner cavity 101;

[0090] It should be noted that the right side and the top of the platform housing inner cavity 101 are open, so that the dynamic coil connector 2 can pass through the right side opening of the platform housing inner cavity 101 horizontally.

[0091] In specific implementation, the horizontal test table 9 is made of hard aluminum casting and adopts a honeycomb-type reinforcing rib structure to ensure the strength and rigidity of the horizontal test table 9.

[0092] In the present utility model, Figure 1 , Figure 2 The vibration table 1 shown is a mature vibration test equipment in the prior art.

[0093] It should be noted that in the present invention, the vibration table 1 in both the horizontal test mechanism and the vertical test mechanism provides linear vibration, that is, linear acceleration, linear velocity, and linear displacement. Figure 1 and Figure 2 The test device shown can convert the linear vibration provided by the vibration table 1 into angular vibration, that is, linear acceleration, linear velocity and linear displacement, into angular acceleration, angular velocity and angular displacement.

[0094] For example, see Figure 1As shown, when conducting a vertical test, the vibration table 1 provides reciprocating linear vibration in the vertical up and down direction (i.e., the direction of the vertical axis Z). At this time, through the hydraulic ball head decoupling device 3 and the first hydraulic bearing 5, the linear vibration can be converted into: angular vibration around the axis (i.e., rotational movement around the horizontal axis X).

[0095] For example, see Figure 2 As shown, when conducting a horizontal test, the vibration table 1 provides reciprocating linear vibration in the lateral left and right directions (i.e., the direction of the horizontal axis X). At this time, through the hydraulic ball head decoupling device 3 and the liquid hydrostatic bearing 10, the linear vibration can be converted into: angular vibration around the axis (i.e., rotational movement around the vertical axis Z).

[0096] In the present utility model, Figure 1 , Figure 2 The hydraulic ball head decoupling device 3 shown is a mature device in the prior art. The hydraulic ball head decoupling device adopts a mature static pressure support double ball head structure in the prior art, which can be used to transmit axial vibration, and has no constraints in the other two translational and three rotational directions, so as to achieve the decoupling of translational and rotational movements and prevent the device from getting stuck. This is the prior art and will not be described in detail here.

[0097] Compared with the prior art, the angular vibration test device provided by the utility model has the following beneficial effects:

[0098] 1. The utility model utilizes a hydraulic ball head decoupling device and a static pressure bearing to convert the linear vibration of the vibration table into the table surface angular vibration.

[0099] 2. By applying the utility model, single-axis angular vibration can be realized, and single-degree-of-freedom pure angular vibration excitation loading can be realized, which solves the problem that the existing turntable cannot simulate high-frequency angular vibration environment, and solves the problem of poor angular vibration purity and measurement accuracy of the existing three-axis six-degree-of-freedom table.

[0100] It should be noted that in the present invention, uniaxial refers to a single direction, and an object has six degrees of freedom in space, namely, the freedom of movement along the three rectangular coordinate axes of x, y, and z, and the freedom of rotation around these three coordinate axes. Uniaxial angular vibration means that the device can achieve angular vibration around a certain coordinate axis, reducing the translational and rotational degrees of freedom in other directions.

[0101] It should be noted that the existing conventional angular vibration table is mainly powered by a hydraulic system, and has the disadvantage of a narrow frequency bandwidth. The device of the utility model performs linear vibration excitation through the vibration table, which can achieve wider frequency band excitation. Based on the principle of line-angle conversion, wide-band angular vibration is achieved through bearings and decoupling devices.

[0102] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An angular vibration test device, characterized in that: Include at least one of a vertical test mechanism and a horizontal test mechanism; The vertical test mechanism is used to load the test workpiece with angular vibration excitation in the pitch and roll directions. The pitch direction is the direction of rotation around the horizontal axis X, and the roll direction is the direction of rotation around the vertical axis Y. The horizontal test mechanism is used to load the test workpiece with angular vibration excitation in the yaw direction, where the yaw direction is the direction of movement rotating around the vertical axis Z.

2. The angular vibration test device according to claim 1, characterized in that: A vertical test mechanism comprises: a vibration table (1), a moving coil connection member (2), a hydraulic ball head decoupling device (3), a vertical test table (4), a first static pressure bearing (5), a bearing mounting base (6), a support frame (7) and a mounting plate (8); A vibration table (1) is arranged on the top of the horizontally distributed mounting plate (8); The vibration table (1) has a vibration table body (100) on the top thereof which is vertically distributed and is provided with a vibration table moving coil; A support frame (7) is provided on the top of the vibration table (1); Two bearing mounting bases (6) are arranged on the top rear side of the support frame (7); The two bearing mounting bases (6) are symmetrically distributed on the left and right sides; A first static pressure bearing (5) is disposed on each bearing mounting base (6); The first static pressure bearing (5) is fixedly connected to the bottom of the vertical test table (4); The vibration table moving coil on the vibration table body (100) is connected to one end of a moving coil connecting member (2) distributed vertically; The other end of the moving coil connector (2) is connected to one end of the hydraulic ball head decoupling device (3); The other end of the hydraulic ball head decoupling device (3) is fixedly connected to the bottom surface of the vertical test bench (4); The top of the vertical test table (4) is used to place the workpiece to be tested.

3. The angular vibration test device according to claim 2, characterized in that: A hollow platform accommodating inner cavity (101) is provided on the vibration platform (1); A vibration table body (100) is arranged in the table body accommodating inner cavity (101).

4. The angular vibration test device according to claim 2 or 3, characterized in that: The front end of the support frame (7) is provided with a notch (700) which passes through vertically; The dynamic coil connecting member (2) vertically passes through the notch (700).

5. The angular vibration test device according to claim 2, characterized in that: The support frame (7) is rigidly fixed on the top frame of the vibration table (1) by bolts.

6. The angular vibration test device according to claim 2, characterized in that: One end of the dynamic coil connector (2) is fixedly connected to the dynamic coil of the vibration table (1) via bolts, and the other end is fixedly connected to the hydraulic ball head decoupling device (3) via bolts.

7. The angular vibration test device according to any one of claims 2 to 6, characterized in that: The rotating shaft of the first static pressure bearing (5) is fixed on the bearing mounting base (6); The rotating bearing portion of the first static pressure bearing (5) penetrates into the rotating shaft; There is an oil film between the rotating bearing and the rotating shaft; The upper end of the rotating bearing part of the first static pressure bearing (5) is fixedly connected to the vertical test table surface (4).

8. The angular vibration test device according to claim 1, characterized in that: A horizontal test mechanism comprises a vibration table (1), a moving coil connection member (2), a hydraulic ball head decoupling device (3), a horizontal test table surface (9), a liquid static pressure bearing (10) and a support seat (11); A vibration table (1) is arranged on the top of the horizontally distributed mounting plate (8); The vibration table (1) has a vibration table body (100) having a right end surface on which a vibration table moving coil (102) is arranged; The vibration table moving coil (102) is connected to one end of the horizontally distributed moving coil connecting member (2); The other end of the moving coil connector (2) is connected to one end of the hydraulic ball head decoupling device (3); The other end of the hydraulic ball head decoupling device is connected to a rotating arm (900) arranged on the outer side of a horizontal test table (9); The top of the horizontal test table (9) is used to mount the workpiece to be tested.

9. The angular vibration test device according to claim 8, characterized in that: The bottom of the horizontal test table (9) is fixedly connected to the top of the support seat (11) through a liquid static pressure bearing (10); the bottom of the support seat (11) is arranged on the top of the horizontally distributed mounting plate (8).

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