Shock excitation and measurement integrated system based on giant magnetostrictive material

Abstract

The invention relates to a shock excitation and measurement integrated system based on a giant magnetostrictive material, which comprises a shock excitation and measurement device structure and a control system, wherein the shock excitation and measurement device structure comprises an offset coil, a shock excitation coil, a short measurement coil, a coil framework, a footstock, a wire guide hole, a power supply module, a peripheral interface, a shock excitation and measurement control module, a housing, a giant magnetostrictive rod, a fixed spring, a prepressing spring, an end cover and a shock rod. The shock excitation and measurement integrated system is mainly characterized in that the shock excitation and the shock measurement are integrated, the offset coil and the shock excitation coil respectively provide a offset magnetic field and an excitation magnetic field for the giant magnetostrictive rod, the shock excitation and measurement control and the power supply module are arranged between the footstock and the hosing, a suspension structure is formed between the shock rod and the end cover through the prepressing spring, and the end cover is connected with the housing through a thread. The invention has the advantages of reduction of quantity of detection devices, flexibility in use, convenience for use, large test range of alternating stresses, high sensitivity and high response speed, and high detection precision.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing and engineering testing, and in particular relates to an integrated vibration detection system based on giant magnetostrictive materials. Background technique [0002] Elastic wave tomography, also known as elastic wave CT, can be divided into acoustic wave CT and seismic wave CT. This technology uses the difference in propagation speed (mainly the longitudinal wave speed) of elastic waves in normal materials and defects (such as honeycomb, uncompacted, segregated or overhead, etc.), and reconstructs the medium by picking up travel time data and computer inversion imaging technology. Velocity distribution images, and then intuitively reproduce the fine structure inside the medium. With the continuous development of electronic and computer technology, elastic wave tomography technology is also becoming mature and perfect. As a novel detection technology, compared with conventional ...

AI Technical Summary

Problems solved by technology

[0005] (1) Multiple exciters and detectors are required in elastic wave CT detection to perform tomographic imaging of the entire velocity field of the material to be tested. Therefore, traditional separate vibration excitation and vibration detection devices are used for elastic wave CT detection When there is a large number of detection equipment, there must be a problem of high detection cost.

[0006] (2) The control part of the vibration excitation / vibration detector is independent of the vibration excitation and vibration detector. The whole detection process adopts the wired control method with the computer as the control core. During the detection, it is necessary to use cables to connect the computer and the control device, multiple The exciter and multiple vibration detectors are connected, so there are problems of complicated installation and high cost of cabling

[0007] (3) At present, elastic wave CT detection adopts the method of instantaneous excitation of a single vibrator and simultaneous vibration detection of all vibrators. Although this detection method is simple and easy to implement, due to the instantaneous elastic wave frequency, amplitude, and The information such as the phase is unknown, and when it propagates through the material with defects, there will be refraction, reflection, diffraction and other phenomena of the wave, which makes it difficult to process the elastic wave signal detected by the vibrator

Images