Engine exhaust noise off-line simulation test table and test method

Abstract

The invention discloses an engine exhaust noise off-line simulation test table and test method, belongs to the environment simulating device field, wherein the structure of the test table comprises a gas source that generates the gas required in simulation of the engine exhaust, a gas inlet control section that controls the flow and the temperature of the gas and eliminates the gas inlet noise, a noise section producing the noise of a simulated engine and a test section that is provided with a test member; the gas source, the gas inlet control section, the noise section and the test section are sequentially connected; the noise section comprises a loudspeaker and a soundproof box; the loudspeaker is located in the soundproof box to prevent the noise displaying process from being interfered by the outside; and the test section is a muffler chamber for isolating the noise from the outside, thereby providing the test environment free from outside influence. According to the invention, the flow, the temperature of the simulated gas and the volume of the noise can be separately controlled; and the simulation of the gas exhaustion noise of the engine in the hot state and the cold state can be finished.

Description

technical field [0001] The invention relates to an off-line simulation test bench and test method for exhaust noise of a vehicle engine, which is used for simulating the exhaust properties of a vehicle engine under different working conditions, and belongs to environmental simulation equipment. Background technique [0002] With the rapid development of modern science and technology and the automobile industry, the production and ownership of automobiles have continued to increase, and automobile noise has become an important source of pollution affecting people's quality of life. Therefore, countries around the world have successively issued relevant laws and regulations to limit motor vehicle noise. Automobile exhaust noise accounts for a large proportion of automobile noise, so installing a muffler after the exhaust pipe is a simple and effective way. For the traditional muffler design method, it needs to go through multiple cycles such as "design-trial-test-improved desi...

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Problems solved by technology

[0004] Also have the research of some engine test devices in this field at present, but some test devices can only simply simulate the engine exhaust under the cold state, such as Cai Chao et al. No. 4) The test bench designed cannot simulate the engine exhaust in the hot state; the sound source used in some test benches is white noise, such as Ruan Dengfang et al. Phase 4) designed the "Internal Combustion Engine Muffler Characteristic Test Device" using white noise sound source, due to the difference between the test environment and the real environment, the application is limited

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