ISO-9052-1-1989.pdf
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1、INTERNATIONAL STANDARD IS0 9052-l First edition 1989-02-15 Acoustics - Determination of dynamic stiffness - Part 1 : Materials used under floating floors in dwellings Acoustique - D F is the dynamic force acting perpendicularly on the test specimen; Ad is the resulting dynamic change in thickness of
2、 the resilient material. In this part of IS0 9052, the following quantities are used: - dynamic stiffness per unit area of the materials struc- ture, s,; - dynamic stiffness per unit area of enclosed gas (e.g. air), s; - apparent dynamic stiffness per unit area of the test specimen, s; - the dynamic
3、 stiffness per unit area of the installed resilient material, s. 1) 1 Pa = 1 N/m* 2) To be published. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 04:46:41 MDTNo reproductio
4、n or networking permitted without license from IHS -,-,- IS0 9052-I : 1989 (El 3.2 natural frequency, m is the mass per unit area of the supported floor. 3.3 resonant frequency, fr: Frequency at which resonance occurs in the test arrangement. The resonant frequency is given by the following equation
5、 : fr= rn; is the total mass per unit area used during the test. 4 Principle Determination of the apparent dynamic stiffness per unit area of the test specimen, sr, by a resonance method in which the resonant frequency, fr, of the fundamental vertical vibration of a spring-and-mass system is measure
6、d, the spring being the test specimen of the resilient material under test and the mass being a load plate. 5 Test arrangement The specimen shall be placed between two horizontal surfaces, i.e. the base (or baseplate) and the load plate. The load plate shall be square, with dimensions (200 f 3) mm x
7、 (200 + 3) mm, and made of steel. The base (or baseplate) and the load plate shall have profile irregularities of less than 0,5 mm and be sufficiently rigid to avoid bending waves in the frequency range of interest. The excitation is applied by one of the methods shown in figures 1, 2 or 3. The tota
8、l load on the test specimen including all measuring and/or excitation equipment shall be 8 kg f 0,5 kg. Excitation and measuring devices shall be applied in such a way that only vertical oscillations (i.e. without rotational com- ponents) occur. For the test set-up shown in figure 1, the inertia of
9、the base shall be such that in vibration its velocity is negligible compared with that of the load plate. For the test arrangements shown in figures 2 and 3, the mass of the baseplate shall be at least 100 kg. 5 Test specimen At least three square specimens of dimensions 200 mm x 200 mm shall be tak
10、en. The surfaces of the test specimens shall be considered to be smooth if the surface irregularities are less than 3 mm. The test specimen shall be covered with a waterproof plastic foil, approximately 0,02 mm thick, on which a thin paste of plaster of Paris and water is applied to a depth of at le
11、ast 5 mm so that any unevenness is covered. Before the plaster begins to set, the load plate shall be bedded onto it as shown in figures la), 2a) and 3a). In the case of closed cell materials, the joint between the specimen and the base (or baseplate) shall be sealed around the perimeter with a fill
12、et of petroleum jelly. See figures lb), 2b) and 3b). 7 Procedure 7.1 General The resonant frequency, fr, of the fundamental vertical vibra- tion of the test specimen and the load plate can be determined by using either sinusoidal, white noise or pulse signals. All these methods are equivalent. In ca
13、se of dispute, the method using sinusoidal signals (7.2) shall be the reference method. 7.2 Sinusoidal signals Obtain the resonant frequency by varying the frequency of excitation, while keeping the excitation force constant. If the resonant frequency depends on the amplitude of the excitation force
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