Random vibration effective amplitude measurement method based on rain flow counting method

A technology of rainflow counting and amplitude measurement, which is applied to vibration measurement in solids, measurement devices, and vibration measurement, etc., can solve the problem of low correlation of subjective perception of drivers and passengers, and achieve good consistency

Active Publication Date: 2021-03-12
上海里莱技术服务中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the measurement results of these methods have low correlation with the subjective perception of drivers and passengers, especially when the amplitude changes with time

Method used

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  • Random vibration effective amplitude measurement method based on rain flow counting method
  • Random vibration effective amplitude measurement method based on rain flow counting method
  • Random vibration effective amplitude measurement method based on rain flow counting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment is a method for measuring the effective amplitude of the vibration of the engine cover under the action of high-speed airflow when the car is running at high speed on the expressway, or when the car overtakes a large vehicle and shakes under the turbulent flow at the rear of the front car. If the engine cover shakes violently, the driver and passengers can easily feel the vibration through vision, which will interfere with the driver and reduce the safety feeling of the driver and passengers, thereby reducing the evaluation of the safety of the vehicle by the drivers and passengers. The specific implementation steps are as follows.

[0025] S1. According to figure 2 For the five positions shown on the engine cover, the measuring points are arranged on the inner panel side of the engine cover. The sensor used for measurement is preferably a wire-type displacement sensor, and an acceleration sensor can also be used. If an acceleration sensor is used, th...

Embodiment 2

[0031]This embodiment is an effective amplitude measurement method when the engine cover or other components vibrate when the vehicle is running on a bad road or other vehicles are working under severe working conditions. This embodiment still takes figure 2 The engine cover and the arrangement of measuring points shown are taken as an example to illustrate another implementation of the effective amplitude measurement method provided by the present application.

[0032] When the vehicle works under harsh working conditions, many components will vibrate. If the vibration is too large, it will not only further reduce the comfort of drivers and passengers, but also adversely affect the service life of components. The specific implementation steps of the measurement are as follows.

[0033] S1. According to figure 2 For the five positions shown on the engine cover, the measuring points are arranged on the inner panel side of the engine cover. The sensor used for measurement i...

Embodiment 3

[0037] What this embodiment measures is the effective vibration amplitude of the vehicle rearview mirror or the external display screen. The rearview mirror often shakes in the direction of rotation during driving. This jitter will be amplified on the image seen by the driver, affecting driving comfort and safety. These jitters on the external display screens on trains and airplanes will also obviously affect the viewing comfort of passengers. The method for measuring the effective amplitude of these tested parts, taking the tested part as a flat cuboid as an example, includes the following steps.

[0038] S1. According to image 3 As shown, three sets of measurement channels are arranged on the DUT: the first group consists of four channels C1~C4, which are respectively located at the four corners of the largest plane of the cuboid, and the measurement direction is perpendicular to the surface of the DUT; the second and third groups are respectively There are 2 channels, n...

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PUM

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Abstract

The invention discloses a random vibration effective amplitude measurement method based on a rain flow counting method. The measurement method comprises the following steps: S1, obtaining a time domain vibration signal of at least one channel of a measured object; S2, performing cycle counting by using the rain flow counting method, and obtaining the amplitude of each full cycle; and S3, calculating the root-mean-square values of all the full-cycle amplitudes obtained in step S2, and taking the root-mean-square values as effective amplitudes. The measurement method can be used for accurately evaluating the jitter of a rearview mirror, the instrument panel, the engine cover and the vehicle-mounted display screen of a vehicle in the driving process to replace subjective evaluation or be combined with the subjective evaluation. Through the measurement of a plurality of channels, the translation and rotation effective amplitudes of a measured object in each direction of a three-dimensionalspace can be obtained. The measurement result can be used for evaluating whether the design meets the requirements or not, or providing test data for improving the design.

Description

technical field [0001] The present application relates to a method for measuring the effective amplitude of random vibration, in particular to a method for measuring the effective amplitude of random vibration based on the rainflow counting method. Background technique [0002] The random vibration generated by the vehicle during driving will make its rearview mirror, instrument panel, display screen and other components vibrate. Jitter, similar jitter will also occur on the external display screens on large vehicles such as buses, trains, and airplanes. The vibration of the rearview mirror, instrument and display screen of the vehicle will make the driving comfort of the driver or passengers worse, and the vibration of the rearview mirror and instrument will also cause safety hazards. Noise will shorten the service life of parts and components, and it will also make drivers and passengers feel worse about the safety and quality of the vehicle. [0003] These jitters have ...

Claims

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Application Information

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IPC IPC(8): G01H1/16G01M17/007G06F17/18
CPCG01H1/16G01M17/007G06F17/18
Inventor 杨华廷
Owner 上海里莱技术服务中心
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