a vibrator

Abstract

The invention discloses a novel vibration exciter. The novel vibration exciter comprises a vibration excitation device. The vibration excitation device comprises a driving mechanism, a transmission mechanism, a cam mechanism and a driven mechanism, wherein the driving mechanism is connected with the cam mechanism through the transmission mechanism to drive the cam mechanism to rotate, the driven mechanism is arranged between the cam mechanism and a to-be-excited body so that the cam mechanism can rotate to drive the driven mechanism to make contact with and impact the to-be-excited body, and thus, vibration excitation can be conducted on the to-be-excited body. The novel vibration exciter provided by the invention can precisely control the vibration excitation time and the vibration excitation displacement, and is especially suitable for a machine tool spindle system.

Description

technical field [0001] The invention relates to the field of modal analysis, in particular to a novel vibrator. Background technique [0002] Modal analysis is a modern method to study the dynamic characteristics of structures, and it is the application of system identification method in the field of engineering vibration. Mode is the natural vibration characteristic of mechanical structure, each mode has specific natural frequency, damping ratio and mode shape; these mode parameters can be obtained by calculation or test analysis, such a calculation or test analysis process is called mode state analysis. The modal parameters are obtained by identifying the collected system input and output signals through experiments, which is called experimental modal analysis. [0003] Vibrational modes are an inherent, integral property of elastic structures. By obtaining the modal parameters of the structure through the modal analysis method, the actual vibration response of the stru...

AI Technical Summary

Problems solved by technology

Among them, manual excitation has many disadvantages: First, the quality control of excitation is difficult, even for skilled operators, the proportion of bad excitation is not low

Second, the uniformity of each excitation is also difficult to control, and the method of single-point multiple excitation and averaging is difficult to achieve the purpose of improving accuracy.

Third, for the machine tool spindle system, the modal parameters under its operation have more application value for dynamic performance analysis, but the method of manual excitation cannot be used when the spindle is rotating

Furthermore, the existing mechanical vibrators no longer control the movement of the vibrating part after the acceleration of the vibrating part is completed, that is, the motion of the actual vibrating time period cannot be controlled.

Therefore, the existing methods all have the disadvantage that neither the excitation time nor the excitation displacement can be accurately controlled.

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