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| Research on the Measurement Method of Restitution Coefficient for Rubber Balls in Architectural Acoustics |
| LI Yubin1,YAN Jianwei2,LUO Hao1,YU Ling1 |
1. Chongqing Academy of Metrology and Quality Inspection, Chongqing 401123, China
2. Hangzhou Aice Testing Technology Co., Ltd., Hangzhou, Zhejiang 310000, China |
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Abstract The rubber ball is a hollow sphere, used for architectural acoustics measurements to simulate the sound and vibration generated by human activities.The recovery coefficient is an important parameter for measuring the characteristics of the rubber ball.To measure the recovery coefficient of the rubber ball accurately,quickly,and easily,a measurement method and system construction are introduced.The measurement system consists of a multi-channel signal analyzer,an accelerometer,a PC computer with software,and a testing fixture.The system captures the time-domain signals of the rubber ball in real-time and processes them to calculate the measurement values.Two measurement methods for the recovery coefficient are provided as reference comparisons,taking into account the errors caused by the measurement environment (based on initial height and arbitrary height).The experimental results show that the recovery coefficients obtained from both methods at three different preset heights (0.8m,1m,1.2m) fall within the allowable error range (0.8±0.1), demonstrating the feasibility of both methods. The two proposed rubber ball restitution coefficient measurement methods have the characteristics of simple structure, accurate measurement and high efficiency. In particular, the method of calculating the rubber ball restitution coefficient using the bounce collision time difference is simple and easy to implement and has good engineering practicability.
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Received: 26 July 2023
Published: 04 July 2024
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2024, Vol. 45 
