GB/T 22159.5-2017 in English

《GB/T 22159.5-2017声学与振动 弹性元件振动-声传递特性实验室测量方法 第5部分：弹性支撑件低频平动动刚度的驱动点测量方法》由TC17（全国声学标准化技术委员会）归口，主管部门为中国科学院。

Scope

This part of GB/T22159 details a measurement method for the low-frequency translational stiffness driving point under specific preload conditions in elastic supports. When measuring at the output end of the elastic support, an experimental method involving force and vibration measurements at the input end to determine dynamic stiffness is called the driving point measurement method. The stiffness derived from measuring input displacement (velocity, acceleration) and force is referred to as the driving point dynamic stiffness. This method can only be used for determining the dynamic stiffness of elastic supports in low-frequency ranges because the driving point dynamic stiffness equals the transmitted dynamic stiffness.

Note 1: GB/T22159.2 already includes a direct measurement method for dynamic stiffness.
The direct method encompasses measurements of low-frequency dynamic stiffness and theoretically has a broader frequency range than the driving point method. However, the driving point method is also included in this series of standards as a beneficial choice to expand the use of equipment measuring low-frequency dynamic stiffness (which are usually very expensive) for those who possess such devices. This method applies to measurement specimens with parallel connection surfaces (see Figure 1). The elastic elements measured by this part serve to reduce:
a) Vibrations in the lower audio frequency band (typically between 20 Hz and 200 Hz) propagating into structural bodies, where undesirable fluid sounds may be generated (e.g., air noise, water noise, or other sounds);
b) Low-frequency vibrations (1 Hz to 80 Hz), if such vibrations are too strong, they can pose a hazard to human health or any sized structures.
Note 2: In practical scenarios, the dimensions of measurement devices limit the ability to measure extremely small or large elastic supports.

Note 3: This method also includes continuous support specimens with strips and pads.
Users of this part must adequately describe the complex vibration-voice transfer characteristics of these samples. This part also covers methods for measuring displacement parallelly and perpendicularly to the connection surface of the specimen under test. The applicable frequency range for this measurement method is from 1 Hz to a frequency upper limit, \(f_u\), typically ranging between 50 Hz and 200 Hz. Data obtained using this part can be used for:
— Information provided by manufacturers and suppliers;
— Information for product development;
— Quality control;
— Calculating the vibration transmission rate of elastic elements.

Note 1: If the elastic support does not have a parallel connection surface, an auxiliary fixture with a parallel connection surface must be used to fix it and included as part of the test element to meet the necessary measurement conditions.
Note 2: The direction of load is indicated by arrows in the figure.