Abstract
The instrument panel assembly is an important structure to shield powertrain noise and front wheel noise, and the instrument panel sound insulation system plays a key role in it. Therefore, the sound insulation characteristics of the instrument panel sound insulation components appear particularly important. In the existing technology, the acoustic design of instrument panel mostly adopts the reverse design method and pays little attention to the forward design of acoustic system, which tends to lead to the shortcomings such as inaccurate acoustic design and poor acoustic design quality. The reverse design also restricts the development cycle, so the control and design of acoustic performance cannot be realized in the initial stage of design. Based on the above problems, the statistical energy model of the dashboard model was established by combining the statistical energy flow method and the proxy model method, and the influences of different acoustic cladding layers, different thickness, leakage, and new material microfibers on the sound insulation parameters of the front coaming were simulated. The general rules that affect the sound insulation performance of the structure are obtained. On this basis, multiobjective genetic algorithm and proxy model method are used to optimize the insertion loss of the front panel acoustic pack and the weight of the dashboard by introducing multiobjective variable and experimental design method, so as to obtain the best solution to meet the requirements of insertion loss and lightweight acoustic pack of the dashboard. It is of great engineering significance for the development of acoustic components for forward design instrument panel.
Highlights
With the rapid development of the automobile industry, the focus of consumers is on appearance, operation, fuel economy, and other aspects, and on driver and passenger comfort
Tested on the whole thing, sound insulation quantity measurement method can consider the influence of the structure characteristics of the specimens, including reverberation chamber, reverberation chamber method, the reverberation room, and anechoic chamber method
Comparing Scheme 1 with Scheme 3, after hole coverage is increased, the sound insulation performance is improved with the increase of frequency, and the insertion loss difference between the two schemes meets the maximum at 8000 Hz, Shock and Vibration Base
Summary
With the rapid development of the automobile industry, the focus of consumers is on appearance, operation, fuel economy, and other aspects, and on driver and passenger comfort. Compared with the reverberation room-anechoic room method, the anechoic room in this combination can be used for sound insulation measurement, and for other acoustic tests such as noise source identification. E acoustical bag of the dash panel is made up of porous and large damping materials such as foam and felt It consumes medium and high frequency noise energy with the friction between materials and achieves the purpose of sound absorption and sound insulation [2]. When solving the calculation equation, under the condition of considering the external input excitation of the model, combined with the material test characteristics of the acoustic package structure, the loss factor, and modal density used between subsystems, the energy of the system is calculated; the energy Ei on each subsystem is obtained [7]. The energy contained in the corresponding system can be transformed into the corresponding displacement, subsystem speed, and strain, which can be measured
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