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Vibration exciter noise isolation method

A vibration exciter and noise technology, which is applied in the field of NVH detection, can solve problems such as interference with abnormal noise testing, and achieve the effect of increasing the range of pressure changes, increasing the range of pressure changes, and stabilizing adsorption

Pending Publication Date: 2021-03-09
CHINA AUTOMOTIVE ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a noise isolation method for the exciter to solve the problem in the prior art that the abnormal noise of the structure formed between the high-frequency vibration generated by the exciter and the object under test will interfere with the abnormal noise test

Method used

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  • Vibration exciter noise isolation method
  • Vibration exciter noise isolation method
  • Vibration exciter noise isolation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 is basically as attached figure 1 with figure 2 Shown:

[0035] In the vibration exciter noise isolation method, a vibration isolation element 4 is provided between the exciter 1 and the measured object 3, because the high-frequency vibration generated by the vibrator 1 will form structural abnormal noise with the measured object 3, thereby affecting the measured object. The abnormal noise test of the test object 3, and the vibration isolation element 4 in this embodiment can isolate such high-frequency vibration.

[0036] In this embodiment, the vibration isolation element 4 includes an integrally formed rubber pad 10 and a rubber sleeve 11, wherein the rubber sleeve 11 is in interference fit with the output shaft 2 of the vibrator 1, and there are several holes on the inner wall of the rubber sleeve 11. Annular connecting grooves 12, several annular connecting grooves 12 are equally spaced, so that the output shaft 2 of the exciter 1 can better enter t...

Embodiment 2

[0038] Embodiment 2 is basically as attached image 3 Shown:

[0039] The difference from Embodiment 1 is that a horizontal cylinder 20 is fixed outside the rubber pad 10, the left end of the cylinder 20 is open, and the right end of the cylinder 20 is closed. A mounting base body is fixed, and the mounting base body includes an elastic member 21 and a fixed plate 22. One end of the elastic member 21 is connected to the cylinder body 20, and the other end is connected to the fixed plate 22. In this embodiment, the elastic member 21 can be selected from a spring or a damper. A piston 23 is horizontally slidably connected in the cylinder body 20, and a through hole is opened in the middle of the rubber pad 10, and a connecting rod 24 is hinged between the piston 23 and the top of the output shaft 2, wherein the connecting rod 24 is located in the through hole.

[0040] The right end of the cylinder 20 is fixed with a suction cup 25, the opening of the suction cup 25 is set to t...

Embodiment 3

[0044] Embodiment 3 is basically as attached Figure 4 Shown:

[0045] The difference from Embodiment 2 is that a displacement expansion unit is provided in the first cavity 26, wherein the cylinder body 20 and the output shaft 2 are eccentrically arranged, that is, the central axis of the cylinder body 20 and the central axis of the output shaft 2 no longer overlap , the displacement expansion unit includes a balance bar 31, a pull rod 32 and a support base 33, wherein the support base 33 is hinged on the balance bar 31, one end of the balance bar 31 is hinged with the connecting rod 24, and the other end is hinged with the pull rod 32, and the pull rod 32 is away from the balance bar One end of 31 is hinged on the piston 23, wherein the distance between the support base 33 and the pull rod 32 is L1, the distance between the support base 33 and the connecting rod 24 is L2, L1: L2 is not less than 2, and a bracket 34 is fixed on the inner wall of the cylinder 20. The support ba...

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Abstract

The invention relates to the technical field of NVH detection, and particularly discloses a vibration exciter noise isolation method. A vibration isolation element is arranged between a vibration exciter and a measured object, and the vibration isolation element can isolate structural abnormal sound formed by high-frequency vibration generated by the vibration exciter to the measured object. According to the technical scheme of the vibration exciter noise isolation method, the high-frequency vibration generated by the vibration exciter is isolated through the vibration isolation element, so that a high-frequency vibration signal is isolated while a low-frequency vibration signal is transmitted to the measured object, the high-frequency abnormal sound generated by the vibration exciter to the measured object is greatly attenuated, and the interference of the high-frequency abnormal sound on the abnormal sound test of the measured object is reduced.

Description

technical field [0001] The invention relates to the technical field of NVH detection, in particular to a noise isolation method for an exciter. Background technique [0002] NVH is the English abbreviation of noise, vibration and harshness (Noise, Vibration, Harshness). It is a comprehensive problem to measure the quality of automobile manufacturing. One of the concerns is that statistics show that about 1 / 3 of vehicle failures are related to vehicle NVH problems, and major companies spend nearly 20% of their research and development costs on solving vehicle NVH problems. [0003] At present, the vibrator is the most commonly used excitation source in the process of abnormal noise testing. Usually, the output shaft of the vibrator is connected to the object under test by bonding. Because the vibrator can not only complete the input of low-frequency signals, but also It also produces high-frequency vibrations, which will form structural abnormal noises between such high-freq...

Claims

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Application Information

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IPC IPC(8): F16F15/023F16F15/04F16F15/08G01H17/00G01M17/007
CPCF16F15/0232F16F15/046F16F15/08G01M17/007G01H17/00F16F2222/126F16F2238/022
Inventor 饶刚李沛然佘扬佳谭成友
Owner CHINA AUTOMOTIVE ENG RES INST
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