Nanjing University of Aeronautics and Astronautics

Suzhou Renzheng Zhitan Technology Co., Ltd.

Zhenghua Qian

Peng Li

Zhi Qian

Xianwei Wu

Guan Wang

Chen Yang

Qi Li

Mingming Wang

Yinghong Zhang

Hairui Liu

Zelin Xu

The present invention provides an induction type oil debris signal monitoring and identification system, which comprises an induction type oil debris sensor, used to detect small electromagnetic changes in the oil and output a monitoring signal after processing through a signal processing circuit; a bubble and debris classification and identification network module, used to analyze whether an abnormal amplitude signal in the monitoring signal contains bubbles or not so as to prevent the bubbles from being c as debris, and a two-level debris signal analysis network module, used to analyze the monitoring signal and determine the size and the quantity of debris.

Induction type oil debris signal monitoring and identification system and method

A signal processing system and method for inductive oil abrasive particle sensor, comprising a sensor, an excitation signal generator, an analog signal processing circuit, a MCU signal acquisition module and a computer signal processing module is disclosed. The sensor is provided with two groups of induction coils, the excitation signal generator generates excitation signals and drives the excitation coils of the sensor to output induction signals containing abrasive particle information, and the analog signal processing circuit receives the induction signals output by the sensor and demodulates and amplifies the induction signals. The signal processing system of the sensor applied to online monitoring of oil abrasive particles is simple in structure and convenient to apply, has a complete signal statistics and monitoring interface, and can be used to effectively monitor the size, concentration and other information of the metal abrasive particles in oil in real time.

Signal processing system and method for inductive oil abrasive particle sensor

The present disclosure relates to a method for ultrasonic guided wave quantitative imaging in a form of variable array and belongs to the technical field of ultrasonic non-destructive testing. The method includes: converting a non-linear lippmann-Schwinger equation into a form of linear summation by a method of moments; and selecting acquisition arrays with different numbers of probes to measure a scattered field signal, and modifying Green's functions by variable born approximation for continuous iterations to approximate a true solution, so as to obtain a final objective function Oto be solved. According to the present disclosure, by adjusting the arrays, the number of probes and appropriate solution algorithm can be selected based on the testing accuracy; and the method can achieve quantitative evaluation of non-destructive testing, and can be widely used in practical guided wave testing applications of industrial non-destructive testing.

Method for ultrasonic guided wave quantitative imaging in form of variable array

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Nanjing, China

Zhenghua Qian