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Equivalent sound source simulation method of loudspeaker

A simulation method and loudspeaker technology, applied in design optimization/simulation, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as high difficulty and low efficiency, achieve short simulation time, improve simulation efficiency, and reduce numerical simulation time Effect

Pending Publication Date: 2022-03-01
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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Problems solved by technology

[0004] Aiming at the problem of low efficiency and high difficulty in the calculation process of sound source simulation, the invention discloses an equivalent sound source simulation method of a loudspeaker, the purpose of which is to reduce the difficulty of numerical simulation of the sound source of the loudspeaker and improve the prediction efficiency

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  • Equivalent sound source simulation method of loudspeaker
  • Equivalent sound source simulation method of loudspeaker
  • Equivalent sound source simulation method of loudspeaker

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Experimental program
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Embodiment 1

[0085] Embodiment 1: This embodiment compares the sound pressure level spectrum and directivity of a certain type of loudspeaker obtained through testing and simulation. The speaker simulation model is established through the simulation method proposed in this patent, and the accuracy of the method is illustrated by comparison with the test results.

[0086] A method for emulating an equivalent sound source of a loudspeaker disclosed in this embodiment, the specific implementation steps are as follows:

[0087] Step 1. Measure the sound pressure excitation of the speaker diaphragm position

[0088] Step 1.1 Build a test platform

[0089] according to figure 1 Build a test platform. In order to avoid the influence of ground reflection, place the speaker diaphragm facing up. The built platform is as follows: Figure 6 shown.

[0090] Step 1.2 Measure the sound pressure level spectrum at the diaphragm position

[0091] Arrange sound pressure level monitoring points on the su...

Embodiment 2

[0114] Embodiment 2: This embodiment is the simulation of the direct sound field noise test. The test piece is a thin-walled aluminum drum with a height of 800mm and a radius of 300mm. Its thickness is 1mm. Since the microphone needs to be placed inside the drum, the upper and lower parts of the drum section are both open. The barrel sections are bonded together so that the inside and outside of the barrel are disconnected, forming a closed cavity structure. Aluminum thin-walled drums and upper and lower covers such as Figure 12 shown.

[0115] A method for emulating an equivalent sound source of a loudspeaker disclosed in this embodiment, the specific implementation steps are as follows:

[0116] Step 1. Measure the sound pressure level of the speaker diaphragm position

[0117] Step 1.1 Build a direct sound field test platform

[0118] 5 rows of loudspeakers are used, and 2 speakers in each row form a direct sound field test platform, such as Figure 13 shown.

[0119...

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Abstract

The invention relates to an equivalent sound source simulation method of a loudspeaker, and belongs to the field of spaceflight sound vibration testing. Aiming at the problems of low efficiency and high difficulty in a sound source simulation calculation process, the invention discloses an equivalent sound source simulation method of a loudspeaker, and aims to reduce the sound source numerical simulation difficulty of the loudspeaker and improve the calculation efficiency. According to the method, the sound source of the loudspeaker is equivalent to the speed boundary, the sound pressure of the diaphragm of the loudspeaker is firstly measured through an experiment, and the sound pressure is converted into the mass point speed according to a theoretical formula to be defined on the corresponding speed boundary surface, so that the excitation effect consistent with that of the loudspeaker is generated. According to the equivalent sound source simulation method, the complete modeling process of the loudspeaker can be omitted, factors such as loudspeaker diaphragm materials and constraints do not need to be arranged, the sound-vibration coupling calculation process of the diaphragm is omitted, and the calculation efficiency is improved. The method can be used in simulation of acoustic testing, so as to further guide the development of the experiment.

Description

technical field [0001] The invention relates to an equivalent sound source simulation method of a loudspeaker, which belongs to the field of aerospace sound vibration testing. Background technique [0002] During launch and flight, the spacecraft is subjected to external aerodynamic noise and engine jet noise up to 170dB, which seriously threatens the safety of the spacecraft. Therefore, in the spacecraft design stage, it is necessary to carry out ground tests to check whether the strength of key parts of the spacecraft meets the requirements. [0003] Noise test is the main part of spacecraft ground environment test, which is used to test the performance of spacecraft against random vibration environment. Compared with the commonly used reverberation field test, the direct sound field test has the advantages of strong flexibility, low cost, high efficiency, and low risk. This technology simulates the noise environment outside the spacecraft by placing the test piece insid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/20G01H17/00
CPCG06F30/15G06F30/20G01H17/00Y02T90/00
Inventor 荣吉利张博涵程修妍范博超
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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