CN203465073U - Three-jaw six-degree-of-freedom vibration table - Google Patents

Abstract

The utility model relates to the technical field of inertial group test tooling, in particular to a vibration table with three claws and six degrees of freedom. Including the main part (1) and three rectangular beams (4); the main part (4) is a cylinder with a through groove (2) inside, a raised annular outer edge, and four threaded through holes on the upper surface (3); the upper surface of the beam (4) and the mounting surface are on the same plane; the beam (4) is provided with a bump vertically and horizontally for connecting with the excitation device; the vertical bump (8) A threaded hole is opened on the upper surface; one or more threaded mounting holes (10) are opened on the upper surface of the crossbeam (4) at the vertical projection (8) for installing the sensor. Its beneficial effect is that the weight of the six-degree-of-freedom vibrating table is reduced by using the three-claw beam form; a statically definite plane is formed when the three-claw form is installed, which provides good support and fixation for the tested inertial group, and at the same time improves the installation Efficiency and precision of installation.

Description

A three-claw six-degree-of-freedom vibration table

technical field

The utility model relates to the technical field of inertial group test tooling, in particular to a vibration table with three claws and six degrees of freedom.

Background technique

At present, most inertial groups adopt strapdown structure, and the use of strapdown inertial groups greatly reduces the cost. However, due to the harsh dynamic environment that the inertial group is subjected to during use, it is easily affected by the vibration environment. In order to test the accuracy of the inertial group, it is necessary to conduct a real vibration environment assessment on the inertial group.

In the past, the accuracy assessment of the strapdown inertial group used five degrees of freedom, that is, three orthogonal linear motions and two angular motions, which has a large gap with the real use environment. Therefore, according to actual needs, it is necessary to design a new type of tooling table that can simultaneously apply three orthogonal linear motions and three angular motions to the strapdown inertial group, so as to truly evaluate the performance index of the inertial group during actual flight.

Utility model content

The purpose of the utility model is to provide a three-claw six-degree-of-freedom vibrating table for the problems in the prior art, which solves the problem that the six-degree-of-freedom vibration cannot be applied in the past.

Realize the technical scheme of the utility model purpose:

A vibration table with three claws and six degrees of freedom includes a main body and three rectangular beams.

The main part is a cylinder with a through groove inside, and the shape of the through groove matches the inertial group; the lower surface of the cylinder has a raised annular outer edge in the axial direction; the upper surface of the cylinder is the mounting surface, and there are four holes on the mounting surface. A threaded through hole for connection with the inertial group;

There are three rectangular beams evenly distributed on the side of the main body, the upper surface of the beam and the installation surface are on the same plane; the thickness of the beam is less than the height of the cylinder; each beam is provided with a mounting protrusion in the vertical and horizontal directions at the end far away from the main body. The block is used to connect with the excitation device; the vertical bump is located on the lower surface of the beam, the horizontal bump is located on the side of the beam, and the horizontal bumps of the three beams are arranged counterclockwise when viewed from the mounting surface;

There is a positioning hole on the lower surface of the beam outside the vertical protrusion;

There is a hoisting hole on the lower surface of the beam inside the vertical protrusion;

A threaded hole is opened on the upper surface of the vertical protrusion for installing the vibration device; one or more threaded mounting holes are opened on the upper surface of the beam at the vertical protrusion for installing the sensor.

The crossbeam is provided with reinforcing ribs close to the main body.

The vertical protrusion and the transverse protrusion are inlaid with steel wire thread sleeves, which are used for connection and installation of the vibration excitation device.

The material of the three-jaw six-degree-of-freedom vibrating table is aluminum.

The utility model has the effect that: the three-jaw six-degree-of-freedom vibrating table of the utility model has high rigidity and light weight, and the test frequency is high under the condition of a load of 15g. Due to the use of the three-claw beam form, the weight of the six-degree-of-freedom vibrating table is greatly reduced. When installed in the form of three claws, a statically definite plane is formed, which provides good support and fixation for the tested inertial group, improves installation efficiency and accuracy, reduces the installation area, and facilitates the development of the six-degree-of-freedom test. The platform can improve the efficiency of the six-degree-of-freedom test, and has high safety and reliability.

Description of drawings

Fig. 1 is a top view of a vibration table structure with three claws and six degrees of freedom;

Fig. 2 is a bottom view of the three-claw six-degree-of-freedom vibration table structure in Fig. 1;

Fig. 3 is a schematic diagram of the three-jaw six-degree-of-freedom vibration table structure in Fig. 1;

Fig. 4 is the local structure schematic diagram of crossbeam in Fig. 1;

Figure 5 is the actual vibration control spectrum with a bandwidth of 500Hz;

Figure 6 is the actual vibration control spectrum with a bandwidth of 1000Hz.

In the figure, 1-main body, 2-through groove, 3-threaded through hole, 4-beam, 5-reinforcing rib, 6-positioning hole, 7-lifting hole, 8-vertical bump, 9-transverse bump , 10-threaded mounting hole, 11-outer edge.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

A vibrating table with three claws and six degrees of freedom, the structure of which is shown in FIG. 1 , FIG. 2 and FIG. 3 , including a main body 1 and three rectangular beams 4 .

The main part 1 is a cylinder with a chamfered square channel 2 inside, the shape of the channel 2 matches the inertial group; the lower surface of the cylinder has a raised annular outer edge 11 in the axial direction; the upper surface of the cylinder is for installation There are four threaded through holes 3 on the mounting surface for connection with the inertial group;

There are three rectangular beams 4 evenly distributed on the side of the main body 1, and the upper surface of the beams 4 is on the same plane as the installation surface of the main body 1; the thickness of the beams 4 is 30% to 40% of the thickness of the main body 1; each beam 4 is close to There is a triangular reinforcing rib 5 at the main body part 1; one end of each beam 4 away from the main body part 1 is respectively provided with a bump in the vertical and lateral directions for connecting with the vibration excitation device; the vertical bump 8 is located on the beam 4 The lower surface of the horizontal projection 9 is located on the side of the beam 4, and the horizontal projections 9 of the three beams 4 are arranged counterclockwise when viewed from the installation surface; each vertical projection 8 and the horizontal projection 9 are inlaid with wire thread sleeves , which not only increases the connection stiffness, but also facilitates the connection and installation of the excitation device;

As shown in Figure 4, there is a positioning hole 6 on the lower surface of the beam 4 outside the vertical protrusion 8, through the three positioning holes 6 on the three beams 4, the installation and positioning of the table top can be carried out conveniently and quickly; The three positioning holes 6 can be put into pins, which can protect the excitation equipment from damage when the inertial group is installed and the torque is applied to the connecting screws; it is convenient to maintain the consistency of the test method.

There is also a hoisting hole 7 on the lower surface of the crossbeam 4 inside the vertical protrusion 8. Through these three hoisting holes 7, the test suspension of the three-claw six-degree-of-freedom tabletop can be facilitated; through three-point suspension, the tabletop can form The statically determinate plane provides good support and fixation for the tested inertial group, improves installation efficiency and installation accuracy, reduces the installation area, and facilitates the development of the six-degree-of-freedom test; it also facilitates the maintenance of the test method. constant.

A threaded hole is opened on the upper surface of the vertical protrusion 8 for installing the vibration excitation device; one or more threaded mounting holes 10 are opened on the upper surface of the beam 4 at the vertical protrusion 8 for installing the sensor.

After multiple rounds of finite element calculation and analysis, after comparing the material, size, form and size of ribs, boss position, screw hole position and size and other parameters of the three-jaw six-degree-of-freedom vibrating table, aluminum was finally selected as the manufacturing Material.

During use, use the hoisting hole 7 to suspend the three-jaw six-free vibrating table in this embodiment with rubber ropes to form a statically definite plane; Install an excitation device respectively, and install one or more sensors through the threaded mounting hole 10 of the beam 4; then place the inertial group into the through slot 2, and fix it with the threaded through hole 3, and then the test can be carried out. By using the multi-dimensional controller to control the vibration output of the six vibration devices, the precise control of the six degrees of freedom applied to the inertial group can be realized.

In order to verify the actual use effect of the three-jaw six-freedom vibration table, the table is placed on the six-degree-of-freedom test system, and the weight of the test piece used is 15kg. First, the required reference spectrum is used to verify the three-jaw six-degree-of-freedom vibration table For assessment, the reference spectrum bandwidth is 20-500Hz, and the actual vibration control spectrum is shown in Figure 5. It can be seen from Figure 5 that within the control bandwidth, the control error is small, and the entire frequency band of the control spectrum is within ±3dB, without obvious out-of-tolerance phenomenon, and the control effect is very good, which meets the requirements of the test task.

In order to further test the performance of the three-jaw six-degree-of-freedom vibration table, the control bandwidth is extended to 1000 Hz, and the reference spectrum bandwidth is 20-1000 Hz. The actual vibration control spectrum is shown in Figure 6. It can be seen from Figure 6 that the actual control effect is very good, and there is no obvious out-of-tolerance phenomenon within the control bandwidth. It shows that this three-jaw six-degree-of-freedom vibration table has the ability to complete the test requirements within the control bandwidth of 1000Hz, which expands the application range of this table.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. If these modifications and variations fall within the scope of the claims of the utility model and their equivalent technologies, the utility model is also intended to include these modifications and variations.

Claims (5)

1. A vibrating table with three claws and six degrees of freedom, characterized in that it includes a main body (1) and three rectangular beams (4); The main part (1) is a cylinder with a through groove (2) inside, and the shape of the through groove (2) matches the inertial group; the lower surface of the cylinder has a raised annular outer edge in the axial direction; the upper surface of the cylinder is On the mounting surface, four threaded through holes (3) are provided on the mounting surface for connection with the inertial group; There are three rectangular beams (4) evenly distributed on the side of the main body (1), and the upper surface of the beams (4) is on the same plane as the installation surface; the thickness of the beams (4) is less than the height of the cylinder; each beam (4) is far away from One end of the main body (1) is provided with a mounting bump vertically and laterally for connection with the vibration device; the vertical bump (8) is located on the lower surface of the beam (4), and the horizontal bump (9) Located on the side of the beam (4), the horizontal projections (9) of the three beams (4) are arranged counterclockwise from the installation surface; there is a positioning hole on the lower surface of the beam (4) outside the vertical projection (8) (6); There is also a hoisting hole (7) on the lower surface of the crossbeam (4) inside the vertical projection (8); There is a threaded hole on the upper surface of the vertical protrusion (8) for installing the vibration device; one or more threaded mounting holes (10) are opened on the upper surface of the beam (4) at the vertical protrusion (8), For installing sensors. 2. A vibrating table with three claws and six degrees of freedom according to claim 1, characterized in that: the beam (4) is provided with reinforcing ribs (5) near the main part (1). 3. A vibration table with three claws and six degrees of freedom according to claim 2, characterized in that: the reinforcing rib (5) is triangular. 4. A vibrating table with three claws and six degrees of freedom according to claim 1, characterized in that: said vertical protrusion (8) and transverse protrusion (9) are inlaid with wire thread inserts. 5. A three-claw six-degree-of-freedom vibrating tabletop as claimed in claim 1, wherein the material of the three-claw six-degree-of-freedom vibrating tabletop is aluminum.

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