Braking flutter inhibition method based on chassis angle assembly transient dynamics

A dynamic and chattering technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as high cost and limited feasibility, and achieve the effect of low cost, low improvement cost and high feasibility

Inactive Publication Date: 2018-04-13
TONGJI UNIV
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Problems solved by technology

These two patents are suitable for improving brake chatter in automotive forward design, however, for vehicles where brake chatter occurs, the cost of improving this aspect is high, and its feasibility is limited

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  • Braking flutter inhibition method based on chassis angle assembly transient dynamics
  • Braking flutter inhibition method based on chassis angle assembly transient dynamics
  • Braking flutter inhibition method based on chassis angle assembly transient dynamics

Examples

Experimental program
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Embodiment

[0053]A brake chatter suppression method based on the transient dynamic analysis of the chassis corner assembly, which can reproduce the brake chatter phenomenon, and proposes effective measures to suppress the brake chatter. Its overall process is as follows figure 1 shown, including the following steps:

[0054] Step 1: Carry out the road test of the whole vehicle, and collect signal data such as brake oil pressure, wheel speed, noise sound pressure level at the driver's ear, and three-way acceleration of the brake caliper. The noise at the side of the driver's ear is collected by a sound level meter fixed on the headrest. The acceleration sensor of the brake caliper is installed on the end surface of the piston side of the brake caliper, and the oil pressure sensor is connected in series in the front brake pipeline.

[0055] Step 2: Analyze and process the test data obtained from the vehicle road test, and obtain the change characteristics of brake pressure, brake caliper...

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Abstract

The invention relates to a braking flutter inhibition method based on chassis angle assembly transient dynamics. The method comprises the following steps that: performing a braking flutter finished automobile road experiment; obtaining experiment data, according to the obtained data, obtaining a working condition parameter and a flutter evaluation index when flutter happens; establishing a finiteelement model of the chassis angle assembly transient dynamics, setting an input parameter according to the working condition parameter when the flutter happens, and verifying the model; according tothe finite element model, obtaining stick slip motion characteristics when the flutter happens, and determining a relationship among a system structure parameter input by the model, frictional characteristics and stick slip motion; and inputting the parameters into the model, and according to a model output result, selecting the input parameter which exhibits a highest influence amplitude value onthe flutter evaluation index output by the model, and obtaining a method for inhibiting the flutter of a vibrator. Compared with the prior art, the method has the advantages that a flutter problem ina braking process is effectively solved from a principle, automobile improvement cost is low, feasibility is high and the like.

Description

technical field [0001] The invention relates to the field of brake chatter suppression of automobile brakes, in particular to a brake chatter suppression method based on the transient dynamics of a chassis angle assembly. Background technique [0002] The frictional vibration and noise of brakes have always been one of the important issues affecting the NVH performance of the whole vehicle. In the ranking of new car quality problems complained by users, the vibration and noise of brakes have always been ranked in the top three. The frequency range of brake chatter is 50-500Hz. At present, it is generally believed that it is a stick-slip vibration phenomenon caused by the difference between the dynamic and static friction coefficients of the friction pair. It often occurs during the low-speed creeping process when the car starts or stops. In recent years, with the accelerated popularization of automatic transmission vehicles around the world and the increasing urban traffic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/23G06F2119/06G06F2119/10Y02T90/00
Inventor 孟德建张立军张兴张频捷余卓平
Owner TONGJI UNIV
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