Noise testing method and device

Abstract

The invention discloses a noise testing method and device and relates to the field of engineering machinery, and the method and the device are used for predicting the noise of a whole vehicle. The noise testing method comprises the following steps: setting a test point; in the digital prototype stage, calculating the sound pressure level of each noise source relative to the measuring point according to the pre-stored parameters of each noise source; and in the physical prototype stage, calculating the noise value of a physical prototype under the following conditions: all noise sources are considered, one of the noise sources is eliminated in sequence, other noise sources are reserved, and the noise of all the noise sources is eliminated. According to the noise test method provided by the technical scheme, the noise can be measured in a whole vehicle mode in both the digital prototype stage and the physical prototype stage, and the test results of the digital prototype stage and the physical prototype stage are mutually coupled, so that an effective mode is provided for the overall noise prediction of the vehicle.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a noise testing method and device. Background technique [0002] Engineering vehicles have high engine power and high noise, and the cooling fan has a large diameter, high speed, and high noise, resulting in high radiation noise from the whole machine, causing environmental noise pollution, and seriously affecting human physical and mental safety. Therefore, countries and regions such as China and the European Union have issued strict noise limit requirements for construction machinery to control the noise pollution of construction machinery products. For example, China's "GB1495-2002 Vehicle Acceleration Exterior Noise Limits and Measurement Methods", this standard sets the mandatory requirements for the passing noise of construction vehicles, and requires that the product noise cannot meet the standard requirements. If the noise of the product exceeds the standard, the cer...

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Problems solved by technology

[0004] The inventor found that there are at least the following problems in the related technology: the related technology cannot determine the relationship between the noise of each component and the passing noise, lacks a calculation and prediction method for the noise of the whole machine, cannot obtain the noise distribution, and cannot effectively know the direction of the noise It is impossible to put forward the noise control requirements of parts and components, and it is impossible to control the noise of the whole machine from the design stage. It often takes several rounds of rectification after the prototype is offline to make the noise meet the requirements, which not only prolongs the product development cycle, but also wastes manpower. material resources, increasing product development costs

If commercial acoustic simulation software is used for vehicle-level noise simulation, since there are many noise sources and the frequency characteristics of different noise sources are different, it is necessary to comprehensively use simulation methods such as finite element method and statistical energy method, and the modeling and calculation will take a long time, and Simulation needs to obtain many parameters, and some parameters are difficult to obtain

Therefore, the vehicle-level noise simulation has not been applied in the construction machinery industry

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