Device for measuring dynamic elasticity modulus of soft deadening felt

Abstract

The invention relates to a device for measuring dynamic elastic characteristics of a soft deadening felt. The device comprises an upper vibration mass block, a lower vibration bottom plate, a vibration excitation table, an upper acceleration sensor, a lower acceleration sensor and a measurement module, wherein the lower vibration bottom plate is rigidly connected to a vibration head of the vibration excitation table; a sample block to be measured is clamped between the upper vibration mass block and the lower vibration bottom plate, the upper acceleration sensor is rigidly installed on the upper vibration mass block, the lower acceleration sensor is rigidly installed on the lower vibration bottom plate, the input end of the measurement module is connected to the upper acceleration sensor and the lower acceleration sensor, and the output end of the measurement module is connected to the vibration excitation table. The measurement module controls the vibration excitation table to generate vertical vibration of different frequencies, receives data collected by the upper acceleration sensor and the lower acceleration sensor, and obtains the dynamic elasticity modulus and the damping coefficient based on the data collected by the upper acceleration sensor and the lower acceleration sensor. Compared with the prior art, the dynamic elasticity modulus and the damping coefficient of thesoft deadening felt can be measured.

Description

technical field [0001] The invention relates to the field of sound insulation felt testing, in particular to a device for measuring dynamic elastic characteristics of soft sound insulation felt. Background technique [0002] In the field of passive sound insulation and noise reduction of automobiles, a loose and porous soft layer and then a dense multi-layer composite structure are often used. The material structure diagram is shown in figure 1 . [0003] The traditional R&D method is material testing→parts production→vehicle verification, so physical parts are made according to the characteristics of ready-made materials and judged by physical parts. If this method analyzes and optimizes the combination of materials with different properties, a large number of samples are required. Part production, long cycle and high cost. Nowadays, CAE analysis is mostly used to predict the sound insulation performance of materials, so the vibration model is used to analyze the acoustic...

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Problems solved by technology

The elastic modulus of the polyurethane foam PUR material is far less than 0.1 times the standard requirement relative to the metal strip, and the elastic modulus of the adhesive will also have an uncertain effect on the softer polyurethane foam PUR material, so GB / T18258 (ASTME756) adopts The cantilever beam test system can not achieve

[0008] The GB / T16406 (ISO6721) standard for testing the damping factor also uses the bending vibration method to measure the resonance curve. It is also necessary to make the tested material into a rectangular strip sample, which is not applicable to the softer polyurethane foam PUR material.

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