【摘要】 火车的车轮在高速行驶的过程中,由于受到各方面力的作用,可能会产生裂纹,需要对其进行检测。本文从声发射的机理出发,一步步阐述了一种新型的声发射传感器——火车轮裂纹检测传感器设计的原理,同时给出了其中内置的前置放大器的设计原理及结构图。传感器使用固体材料作为传感器的传播介质,用新型的压电材料作为敏感元件,提高了灵敏度。更多还原

【Abstract】 During the process of the train’s rapidly tunning, the train will suffer the action of various forces. This may cause the appearance of crack. So it is necessary to measure the crack. The article starts from the theory of acoustic emission and it show us the design theory of a new type of acoustic emission sensor-sensor measuring train wheel crack detailedly and gradually. In the same time the article tells how to design an internal preamplifier set in sensor and its structure diagram. The sensor uses new solid material as transmission media and uses new piezoelectric material as sensitive unit, which raises the sensitivity.更多还原