1. Department of Mechanical Engineering, Zhejiang University, Hangzhou 310058, China 2. Technique Center, Cixing Group Co. Ltd, Ningbo 315301, China 3. Department of Mechanical Engineering, University of Jinan, Jinan 250022, China
The vibration detection technology of ball screws used in automobile braking systems was studied. The vibration detection method of ball screws was proposed and the vibration detection equipment was developed, according to structure, size and motion characteristics of ball screws used in automobile braking systems. The expressions of balls’ rotation and revolution velocities and frequency of balls passing through reversers were derived under the condition of nut rotation based on kinematics. Then, the axial and radial vibration of ball screws used in an electric power braking system was measured under the conditions of different nut rotation speeds. The time-frequency distribution characteristics of vibration amplitude were analyzed, and results showed that the measured ball screws had prominent magnitudes near the frequency of balls passing through reversers and its multiplication orders. Lastly, the vibration levels of ball screws were evaluated by using root mean square (RMS) values in octave bands, and the energy distribution characteristics of vibration were obtained in octave bands under different nut rotation speed conditions.
Wen-tao LIU,Kun ZHAO,Jiu-gen WANG,Li SONG. Vibration measurement of ball screws used in automobile braking systems. Journal of ZheJiang University (Engineering Science), 2021, 55(8): 1529-1537.
Fig.2Vibration detection equipment of ball screw used in automobile braking system
Fig.3Frenet coordinate system
Fig.4Vibration signals of ball screw measured
Fig.5Time-frequency spectra of screw vibration with nut rotation speed of 300 r/min
Fig.6Time-frequency spectra of screw vibration with nut rotation speed of 560 r/min
Fig.7Time-frequency spectra of screw vibration with nut rotation speed of 800 r/min
Fig.8Time-frequency spectra of screw vibration with nut rotation speed of 1000 r/min
Fig.9Sketch of balls in returning process
Fig.10RMS values of vibration in octave frequency bands
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