Experimental device for vibration dynamics modal test

Abstract

The invention relates to a modal test technology, in particular to an experimental device for a vibration dynamics modal test. The device comprises an experiment model, two sets of clamps, base columns and an experiment base bottom plate, wherein square hole grooves are formed in the two ends of the experiment model; each set of clamps comprises a clamp upper block and a clamping rod; the cross section of the clamping rod of the first set of the clamps is square; the cross section of the clamping rod of the second set of the clamps is round; the clamp upper block of each set of the clamps areconnected with the experiment model through the clamping rod; the clamping rods with the square cross sections are matched with the square hole grooves in size; the clamping rods with the round crosssections are combined with the square hole grooves in an internally tangent mode; the clamp upper blocks are fixed with the base columns; and the base columns are connected with the experiment base bottom plate. The experimental device can flexibly change experimental working conditions and is convenient to mount and dismount.

Description

technical field [0001] The invention relates to modal test technology, in particular to an experimental device for vibration modal test. Background technique [0002] Modal test, also known as experimental modal analysis, is a vibration test performed to determine the modal parameters of a linear vibration system. Experimental modal analysis is mainly to measure the vibration response signal of the system through modal experiments, or measure the excitation signal and response signal of the system at the same time, and identify the modal parameters describing the dynamic characteristics of the system from the measured signals. Modal parameters are a description of the inherent characteristics of the vibration system in the frequency domain, generally referring to the natural frequency, damping ratio, mode shape, and modal quality of the system. [0003] Commonly used modal tests use a vibrator to excite the structure to be tested, generate an excitation force on the structu...

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Problems solved by technology

However, the experimental working conditions (such as boundary conditions and excitation methods) of the traditional modal test device are single, usually using a cantilever structure with one end fixed and one end free, and a single-point or fixed-point excitation method; on the other hand, the constraints of the experimental device The change and disassembly of the method are also more complicated; the excitation point is often relatively single due to the fixation of the excitation equipment, and it is inconvenient to change the excitation position of the exciter; the design is complicated and the processing cost is high

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