Studies on the Sound and Vibration of a Ball Screw : 2nd Report, Characteristics and Generating Mechanism of Pulse Sound

Abstract

The sound pressure level of the sound generated from a guide-tube-type ball screw is influenced mainly by the pulse sound, which is one of the components of the sound. In the present paper, the pulse sound was investigated in order to obtain basic information for the sound reduction of the ball screw. The test ball screws were operated by the ball screw sound testing machine installed in a soundproof room. The sound generated from the ball screw and the vibrations at its return tube were picked up by a condenser microphone and two piezoelectric accelerometers, respectivery. Using the signals thus obtained, sound and vibration waveform observation, sound pressure level measurement and real-time frequency analysis of the sound etc. period were carried out. From the experimental results and considerations, the fundamental characteristics of the pulse sound and its generating mechanism were clarified, and some basic information on the sound reduction of the ball screw was obtained.