噪音,震动,舒适性(NVH)的研究

Automotive Brake NVH 汽车制动NVH

Seong K. Rhee

SKR Consulting, LLC

Introduction to Brake Noise & Vibration

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L. F. Squeal 低频尖叫声

High Frequency Squeal 高频尖叫声

Frequency 频率(HZ)

Groan 低沉噪音Moan 低沉噪音

Roughness 粗糙度(5 -60 Hz) DTV

Frequency Range for Disc Brake Noise

and Vibration

盘式制动器的噪音和振动的频率范围

Introduction to Brake Noise & Vibration

SOUND 声音

Rapidly fluctuating air pressure caused by

vibrating surface

由表面振动引起的空气压力的迅速振荡

HIGH FREQUENCY SQUEAL

高频尖叫声

Caused by Vibration of Disc

由制动盘振动引起

Introduction to Brake

Noise & Vibration

Introduction to Brake Noise & Vibration

LOW FREQUENCY SQUEAL

低频尖叫声Caused by Vibration of Caliper Body,

Anchor Bracket, or Knuckle 由卡钳,挂钩或者关节的振动引起

Vibration Excitation Of Disc/Caliper Assembly

制动盘/卡钳总成振动的激发

z Caused by Pad and Backing Plate Vibration/Impact

z由刹车片和钢背的振动/冲击引起

z Pad-Disc Modal Coupling

z刹车片和刹车盘的结合方式

z Backing Plate-Caliper Interactions

z钢背和卡钳的相互作用

z Contact Pressure Distribution

z接触压力的分配

Introduction to Brake

Noise & Vibration

Practical Squeal Solutions; Excitation vs. Response

实际尖叫的解决办法;激发和响应

z De-Coupling of Disc, Pad and Caliper

z判定耦合的因素:制动盘,刹车片和卡钳的

z Damped Disc 软质制动盘

z Damped Pad 软质刹车片

z Pad Chamfer 刹车片倒角

z Lower Friction (Humidity) 低摩擦系数(湿度)

z No Metal Pick-up on Pad (Lubricants) 刹车片无金属(润滑剂)

Introduction to Brake

Noise & Vibration

Practical Squeal Solutions; Excitation vs. Response

实际尖叫的解决办法;激发和响应

z Anti-Noise Shim and Clip 消音片和夹子

z Smooth Sliding of Pad Assembly 刹车片总成流畅滑动

z Flatness of Backing Plate 钢背的平面

z Caliper Design for Uniform Contact Pressure 均匀接触压力的卡钳设计z Part Variability Reduction (Modals) 部分可变性的减少(程式)

Introduction to Brake

Noise & Vibration

Introduction to Brake Noise & Vibration

Brake Squeal 制动尖叫声

z

Brake squeal is a phenomenon of dynamic instability that occurs at one or more of the natural frequencies of the brake system.

z 制动尖叫声是一种动态不稳定性现象，发生于制动系统的一个或者更多的固有频率上。z The excitation comes from the friction couple. 受摩擦力偶激发。

z Pads and rotor coupling has major impact on mid to high frequency (4 ~ 16 kHz) squeal. z

刹车片和刹车盘接合主要产生中等到高频(4 ~ 16 kHz)尖叫声。

-The disc rotor is acting like a “speaker”(sound wave radiated from the rotor surfaces).

-

刹车盘类似于一个喇叭（声波从刹车盘表面辐射开去）。

z

Low frequency (1 ~ 4 kHz) squeal typically involves caliper, anchor bracket, knuckle and suspension, in addition to pads and rotor.

z

低频(1 ~ 4 kHz) 尖叫除了来自于刹车片和刹车盘外，主要来自卡钳，挂钩，关节和悬挂。