Development of arbitrary waveform torsional vibration signal generator
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Development of arbitrary waveform torsional vibration signal generator Qingjie Zhang1,2 · Guangxiang Lu1 · Chengyu Zhang2 · You Xu3
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In order to more accurately evaluate or calibrate the electronic torsional vibration test analyzer and analysis method, a torsional vibration signal generator is developed in the present study. The developed device generates a tooth pulse interval sequence based on the inverse solution of the shaft torsional equation. Moreover, a single-frequency signal, inter-harmonic signal, time-varying harmonic signal, and noise-containing time-varying inter-harmonic signal are simulated. The pulse width modulation module of TMS320F28335 is used to generate the instantaneous speed gear pulse signal, while the external expanded digital to analog conversion module is utilized to generate the corresponding speed analog signal. The hardware structure of the proposed generator has remarkable advantages, including simple structure, low-cost operation and easy to use interface. Moreover, it can be applied to evaluate or calibrate the torsional vibration test analyzer and analytical methods. Keywords Torsional vibration measurement · Torsional vibration generator · Torsional vibration simulator · Torsional vibration calibration · Inter-harmonic signal
1 Introduction Since 1916, the German Geiger designed a mechanical device for measuring the torsional vibration measurement of the shaft. Since then, the measurement, application, and investigation of the torsional vibration signal in various types of systems with a rotating shaft are become more extensive [1–4]. Studies show that the Geiger’s mechanical inertial torsional vibration meter can accurately measure the low-frequency torsional vibration of the shaft. However, since the measurement is performed * Qingjie Zhang [email protected] Guangxiang Lu [email protected] Chengyu Zhang [email protected] You Xu [email protected] 1
School of Electrical Engineering, Southeast University, Nanjing, China
2
School of Engineering, Nanjing Agricultural University, Nanjing, China
3
School of Automation, Nanjing Institute of Technology, Nanjing, China
through direct contact, the system structure is complicated, so that the installation is troublesome. Thus, it is an enormous challenge in this method to handle the high-speed shafting system. In order to resolve such problems, measurements of the torsional vibration are now mainly replaced by electrical signal measuring devices [5–11]. The digital torsional vibration instrument usually uses a non-contact sensor to collect the real-time rotating speed with a high sampling rate. Then time–frequency algorithms are applied to process and analyze the collected signals. These instruments have remarkable advantages, including simple installation, accurate measuring in a wide range of rotational speed, and real-time analysis. However, similar non-contact sensors are exactly identical, and the corresponding adopted time–freque
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