A method for testing sound in a semi-anechoic chamber of a fuel engine

Abstract

The present invention belongs to the technical field of fuel cell engine testing and provides a semi-anechoic chamber sound testing method for fuel cell engines. The method infers the degree of improvement required for each component of the fuel cell engine based on the sound decibel level in different directions of the entire fuel cell engine, identifies the components most in need of improvement, and performs systematic optimization. This method can change the working environment of the components, block the transmission path, and develop new materials to change the sound source. The ability to identify components that need improvement through acoustic testing plays a vital role in the promotion of fuel cell engines. By continuously reducing the sound decibel level, the working environment, sound transmission path, and material properties of engine components are optimized, improving the comfort of using the engine. This is different from traditional engine systems and is conducive to the promotion of fuel cell engines.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel cell engine testing, and in particular relates to a sound testing method for a fuel engine in a semi-anechoic chamber. Background Art

[0002] Acoustic testing is a common testing method. Its primary function is to simulate a semi-free space in a room and determine whether the sound emitted by the sample is within an acceptable decibel range and whether it affects the comfort of the vehicle's users. Current acoustic testing of fuel cell engines typically tests the decibels of the air compressor and water pump separately, rather than measuring the operating decibels of the entire engine.

[0003] If acoustic testing of the entire fuel cell engine system during operation is neglected, the maximum noise level of the fuel cell engine will be defined solely as the decibel level of the noisiest component. This will not improve the noise problem of fuel cell engines and will be detrimental to their promotion. Existing techniques only operate fuel cell engine components and then conduct acoustic testing, resulting in data for individual components. Fuel cell engine noise can only be improved by operating the entire engine, thus failing to fundamentally resolve the noise problem. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for sound testing a fuel engine in a semi-anechoic chamber, aiming to solve the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A method for testing the sound of a fuel engine in a semi-anechoic chamber comprises the following steps:

[0007] S1. Place the fuel cell engine on the test bench and start the fuel cell engine;

[0008] S2, open the semi-anechoic chamber sensor;

[0009] S3. Adjust the relative position of the fuel cell engine and the semi-anechoic chamber sensor to test the sound decibels of the fuel cell engine in different directions;

[0010] S4. Determine the location of the maximum decibel on the fuel engine;

[0011] S5, performing noise reduction optimization processing.

[0012] Preferably, in step S5, the noise reduction optimization process includes improving the damping and vibration isolation mode of the fuel cell engine, and repeating steps S1 to S4 after the improvement.

[0013] Preferably, in step S5, if the fuel cell engine fails to pass the noise reduction test after the damping and vibration isolation method is improved, sound-absorbing materials are used to reduce the noise of the noise source, and steps S1-S4 are repeated after the improvement.

[0014] Preferably, the sound absorbing material comprises a porous sound absorbing material.

[0015] Preferably, the porous sound-absorbing material includes one or more materials selected from inorganic fibers, organic fibers, foam resin materials, and sound-absorbing metal materials.

[0016] Preferably, in step S5, if the fuel cell engine fails the noise reduction test after the sound absorbing material is improved, the internal structure of the noise source is improved, and steps S1 to S4 are repeated after the improvement.

[0017] Preferably, the improved internal structure of the noise source includes providing a sound insulation support member at the noise source.

[0018] Preferably, the semi-anechoic chamber sensor includes a sound collection probe, a data collector and a control computer, and the data collector is connected to the sound collection probe and the control computer respectively.

[0019] Compared with the prior art, the beneficial effects of the present invention include:

[0020] This invention primarily infers the degree of improvement required for various components of a fuel cell engine based on the decibel level of sound in different directions. This identifies the components most in need of improvement and systematically optimizes them. This can alter the component's operating environment, block transmission pathways, and even develop new materials to alter the sound source. Acoustic testing can identify components requiring improvement, playing a crucial role in the promotion of fuel cell engines. By continuously reducing the decibel level, the engine component's operating environment, sound transmission pathways, and material properties are optimized, improving the comfort of using the engine. This distinguishes it from traditional engine systems and is conducive to the promotion of fuel cell engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 Schematic diagram of the testing method of the present invention. DETAILED DESCRIPTION

[0023] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0025] Example:

[0026] like Figure 1 As shown, this embodiment provides a method for testing the sound of a fuel engine in a semi-anechoic chamber, comprising the following steps:

[0027] S1. Place the fuel cell engine on the test bench and start the fuel cell engine;

[0028] S2, open the semi-anechoic chamber sensor;

[0029] S3. Adjust the relative position of the fuel cell engine and the semi-anechoic chamber sensor to test the sound decibels of the fuel cell engine in different directions;

[0030] S4. Determine the location of the maximum decibel on the fuel engine;

[0031] S5, performing noise reduction optimization processing.

[0032] Specifically, in step S5, the noise reduction optimization process includes improving the damping and vibration isolation mode of the fuel cell engine, and repeating steps S1 to S4 after the improvement.

[0033] Specifically, in step S5, if the fuel cell engine fails the noise reduction test after the damping and vibration isolation method is improved, sound absorbing materials are used to reduce the noise of the noise source, and steps S1 to S4 are repeated after the improvement.

[0034] Specifically, the sound absorbing material includes a porous sound absorbing material.

[0035] Specifically, the porous sound-absorbing material includes one or more materials selected from inorganic fibers, organic fibers, foam resin materials, and sound-absorbing metal materials.

[0036] Specifically, in step S5, if the fuel cell engine fails the noise reduction test after the sound absorbing material is improved, the internal structure of the noise source is improved, and steps S1 to S4 are repeated after the improvement.

[0037] Specifically, the improved internal structure of the noise source includes providing a sound insulation support member at the noise source.

[0038] Specifically, the semi-anechoic chamber sensor includes a sound collection probe, a data collector and a control computer, and the data collector is connected to the sound collection probe and the control computer respectively.

[0039] This invention primarily infers the degree of improvement required for various components of a fuel cell engine based on the decibel level of sound in different directions. This identifies the components most in need of improvement and systematically optimizes them. This can alter the component's operating environment, block transmission pathways, and even develop new materials to alter the sound source. Acoustic testing can identify components requiring improvement, playing a crucial role in the promotion of fuel cell engines. By continuously reducing the decibel level, the engine component's operating environment, sound transmission pathways, and material properties are optimized, improving the comfort of using the engine. This distinguishes it from traditional engine systems and is conducive to the promotion of fuel cell engines.

[0040] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for testing the sound of a fuel engine in a semi-anechoic chamber, characterized in that: The following steps are involved: S1. Place the fuel cell engine on the test bench and start the fuel cell engine; S2, open the semi-anechoic chamber sensor; S3. Adjust the relative position of the fuel cell engine and the semi-anechoic chamber sensor to test the sound decibels of the fuel cell engine in different directions; S4. Determine the location of the maximum decibel on the fuel engine; S5. Perform noise reduction optimization processing on the part of the fuel engine with the maximum decibel, the noise reduction optimization processing including improving the damping and vibration isolation method of the fuel cell engine, repeating steps S1-S4 after the improvement, if the noise reduction test fails after the damping and vibration isolation method of the fuel cell engine is improved, using sound-absorbing materials to reduce the noise of the noise source, repeating steps S1-S4 after the improvement, if the noise reduction test fails after the sound-absorbing materials are improved on the fuel cell engine, improving the internal structure of the noise source, repeating steps S1-S4 after the improvement.

2. The method for testing the sound of a fuel engine in a semi-anechoic chamber according to claim 1, characterized in that: The sound absorbing material includes a porous sound absorbing material.

3. The method for testing the sound of a fuel engine in a semi-anechoic chamber according to claim 2, characterized in that: The porous sound-absorbing material comprises one or more materials selected from inorganic fibers, organic fibers, foamed resin materials, and sound-absorbing metal materials.

4. The method for testing the sound of a fuel engine in a semi-anechoic chamber according to claim 1, characterized in that: The improved internal structure of the noise source includes arranging a sound insulation support member at the noise source.

5. The method for testing the sound of a fuel engine in a semi-anechoic chamber according to claim 1, characterized in that: The semi-anechoic chamber sensor includes a sound collection probe, a data collector and a control computer, and the data collector is connected to the sound collection probe and the control computer respectively.

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