A multi-frequency coupled vibration aging system and method

Abstract

The invention relates to the technical field of vibration aging, and especially relates to a multiple-frequency coupling vibration aging system and method thereof. The system comprises a host computer system, a signal output card, a driver, a vibration exciter, an acceleration sensor, a charge amplifier, a signal acquisition card and a support device, wherein a workpiece is mutually and fixedly connected with the vibration exciter and supported by a support device, and thus the workpiece is subjected to vibration excitation; the host computer system controls the signal output card to output synthetic vibration signal; the driver amplifies the synthetic vibration signal and drives the vibration exciter to generate vibration; the host computer system obtains the voltage signal, which is acquired by the signal acquisition card, through a computer interface, and the voltage signal is subjected to fast Fourier transform to obtain the frequency spectrum of the voltage signal; a voltage identification module obtains each voltage peak value Ui on the preferable set of frequency points from the frequency spectrum; the vibration level ai is obtained through conversion, and when the relationship (img file = 'DDA0000889767910000011. TIF' wi='266' he='144' / ) is satisfied, the host computer system controls the signal output card to subject the workpiece to vibration aging treatment under the synthetic vibration signal.

Description

Technical field [0001] The invention relates to the technical field of vibration aging, in particular to a multi-frequency coupling vibration aging system and method. technical background [0002] Vibration aging technology is a method of eliminating residual stress widely used in the field of mechanical engineering, that is, applying mechanical vibration load to the workpiece. When the sum of the residual stress inside the workpiece and the additional vibration stress exceeds the local yield limit of the material, there will be occurrences in the material. Local plastic deformation, so that the local residual stress inside the material can be released. [0003] The traditional vibration aging technique firstly sweeps the workpiece to vibrate, find the natural frequency of the workpiece, and then select a specific frequency as the excitation frequency in the sub-resonant region of the natural frequency; then perform fixed-frequency vibration on the workpiece at the excitation frequ...

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Problems solved by technology

Although adjusting the output energy of the driver can increase the energy of random excitation, such adjustment is limited after all, resulting in the energy of key frequency points is still small, so the application of random vibration aging technology in the field of mechanical engineering has certain limitations sex

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