NING Baoqi1, LI Chaofeng1, YANG Shuhua2, 3, MENG Jigang3, LI Kaihua3.Development and Research on Non-contact Modal Characteristics Test System of Axial-Flow Rotor Blade[J].航空发动机,2017,43(6):76-83
Development and Research on Non-contact Modal Characteristics Test System of Axial-Flow Rotor Blade
DOI：
Key Words:axial rotor blade  non-contact measurement  resonance method  modal characteristics  natural frequency  modal damping ratio
Author NameAffiliationE-mail
NING Baoqi1, LI Chaofeng1, YANG Shuhua2, 3, MENG Jigang3, LI Kaihua3 1.School of Mechanical Engineering & Automation, Northeastern University, Shenyang, 110819, China
2. School of Energy and Power Engineering, Dalian University of Technology
3. Shenyang Blower Co., Ltd. , Shenyang, 110819, China 		baoq.ning@foxmail.com 
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Abstract:In order to overcome the rapid vibration attenuation in the high frequency region, the error growth due to using the contact way on vibration exciter and vibration exciter and the technical defects of testers, the axial flow blade vibration modes test system of no contact equipment based on the time domain method by Labview platform was developed. the natural frequencies and vibration modes were tested, the identifications of modal and proportional damping coefficients were developed, which were based on the frequency domain bandwidth method and the least square method. The high frequency vibration signal can be accurately measured and leakage phenomenon disappear through the continuous swept excitation of the system and repeated testing. The results show that the modal characteristics range from 50 Hz to 11000 Hz can be accurately measured. The relative error is within 0.6% by comparing the natural frequency test method and the hammer method, the maximum relative error is below 1% by the modal damping ratio method, and the solution error of the proportional damping coefficient is within acceptable range.
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