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Vol. 170, Issue 5, May 2014, pp. 208-214




An Ultra-low Frequency Modal Testing Suspension System for High Precision Air Pressure Control

Qiaoling YUAN, Jianhui SUN, Xiaohang SHAN, Biqing YE

Key Lab of E&M, Zhe-jiang University of Technology, Ministry of Education & Zhe-jiang Province, Hang-Zhou, 310014, China
Tel.: +86 0571 88320970, fax: +86 0571 88320970

E-mail: yuanql@zjut.edu.cn


Received: 3 March 2014 /Accepted: 30 April 2014 /Published: 31 May 2014

Digital Sensors and Sensor Sysstems


Abstract: As a resolution for air pressure control challenges in ultra-low frequency modal testing suspension systems, an incremental PID control algorithm with dead band is applied to achieve high-precision pressure control. We also develop a set of independent hardware and software systems for high-precision pressure control solutions. Taking control system versatility, scalability, reliability, and other aspects into considerations, a two-level communication employing Ethernet and CAN bus, is adopted to complete such tasks as data exchange between the IPC, the main board and the control board ,and the pressure control. Furthermore, we build a single set of ultra-low frequency modal testing suspension system and complete pressure control experiments, which achieve the desired results and thus confirm that the high-precision pressure control subsystem is reasonable and reliable.


Keywords: Ultra-low frequency modal testing, Suspension system, PID control, Air pressure control.


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