A space three-translation parallel excitation vibration device based on flexible joints

Abstract

The invention discloses a spatial three-translation parallel shock excitation vibrating device based on a flexible joint. The device consists of a movable platform, a static platform, three flexible branch chains with the same structures, and three single-dimensional vibration exciters with the same parameters, and is characterized: each flexible branch chain and a respective corresponding single-dimensional vibration exciter construct a RPRP kinematic branch chain; the top end of the RPRP kinematic branch chain is fixed on the movable platform through threaded connection; the bottom end of the threaded connection fixed on the static platform through threaded connection; and three RPRP kinematic branch chains are uniformly distributed around the central axis of the static platform. Position change of spatial three-translation is realized, and the spatial three-translation high-frequency vibration under a practical working condition is simulated.

Description

technical field [0001] The present invention relates to the field of compliance mechanisms and high-frequency vibrations, in particular to a three-degree-of-freedom parallel workbench composed of a static platform, a dynamic platform, three PRPR-type flexible motion branch chains and three single-dimensional exciters, which can realize spatial The three-translation pose transformation simulates the high-frequency vibration of the three-translation space in the actual working condition. Background technique [0002] With the development of modern mechanical engineering towards high-speed, high-precision and other high-performance directions, the vibration reliability performance test of equipment and devices, especially the high-frequency (above 400Hz) vibration performance test, requires a high-frequency excitation table to simulate the actual high Frequency vibration excitation. Generally, metal contacts of electronic equipment in the aerospace field, valve bodies in mecha...

AI Technical Summary

Problems solved by technology

There are two main problems in the research of the currently known multi-dimensional vibration exciters: one is that most of the multi-dimensional vibration excitation devices with higher excitation frequency are complex in structure, and are actually composed of the superposition and combination of several single-degree-of-freedom mobile vibration exciters. The actual multi-dimensional vibration cannot be truly simulated, especially the rotation excitation cannot be realized. In fact, it is a multi-point excitation system, which is easy to cause the results of multi-dimensional vibration tests that some directions are over-tested and some directions are under-tested; the second is a small amount of vibration. The multi-dimensional vibration excitation device based on parallel mechanism with simple structure has a low vibration frequency, generally below 100Hz, which can only be applied to low-frequency vibration tests and cannot simulate actual high-frequency vibrations. Therefore, there is an urgent need for engineering practice that can truly simulate natural vibrations , and the emergence of a new multi-degree-of-freedom high-frequency excitation device with simple structure

[0005] 1. The publication number is CN101854153A, and the name is "Piezoelectric High Frequency Vibration Table". It is a single-dimensional high-frequency vibration table that can produce a single-dimensional vibration output of 2kHZ-50kHZ, but its defect is that it cannot simulate the actual situation. Multi-degree-of-freedom high-frequency vibration output

[0006] 2. The public number is CN87210629, and the name is "hydraulic asynchronous bumping vibration table", which can perform vertical motion and withstand horizontal motion, but its vibration form is composed of several single-degree-of-freedom exciters, which cannot simulate the actual environment The multi-dimensional real vibration, the working accuracy and frequency are low

[0007] 3. The publication number is CN101038208, and the name is "a six-axis micro-exciter system", which uses flexible joints to realize high-frequency multi-dimensional compound motion, but it produces small deformations, and can only realize high-frequency micro-excitation with six degrees of freedom in space output, but cannot achieve high-frequency motion output at a macroscopic scale

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