Slip Noise Research Articles

제동시 발생하는 리어 드럼브레이크 Grunt(stick-slip) Noise 개선

Grunt(stick-slip) noise happens between rear lining and drum on braking condition while vehicle is returning to steady position after nose-dive. The study presents a new testing and analysis methods for improving brake grunt noise on vehicle. Grunt noise is called a kind of stick slip noise with below 1 kHz frequency that is caused by the surfaces alternating between sticking to each other and sliding over each other with a corresponding change in friction force. This noise is typically come from that the static friction coefficient of surfaces is much higher than the kinetic friction coefficient. For the identification of the excitation mechanism and improvement of grunt noise, it is necessary to study variable parameters of rear drum brake systems on vehicle and to implement CAE analysis with stick slip model of drum brake. The aim of this study has been to find solution parameters throughout test result on vehicle and dynamo test. As a result of this study, it is generated from stick slip between rear lining and rear drum and it can be solved to reduce contact angle of lining with asymmetric and is effected not only brake drum strength but also rear brake size and brake factor.

Effects of Multi-Robot Team Formations on Distributed Area Coverage

This paper examines the problem of distributed coverage of an initially unknown environment using a multi-robot system. Specifically, focus is on a coverage technique for coordinating teams of multiple mobile robots that are deployed and maintained in a certain formation while covering the environment. The technique is analyzed theoretically and experimentally to verify its operation and performance within the Webots robot simulator, as well as on physical robots. Experimental results show that the described coverage technique with robot teams moving in formation can perform comparably with a technique where the robots move individually while covering the environment. The authors also quantify the effect of various parameters of the system, such as the size of the robot teams, the presence of localization, and wheel slip noise, as well as environment related features like the size of the environment and the presence of obstacles and walls on the performance of the area coverage operation.

Effects of Multi-Robot Team Formations on Distributed Area Coverage

This paper examines the problem of distributed coverage of an initially unknown environment using a multi-robot system. Specifically, focus is on a coverage technique for coordinating teams of multiple mobile robots that are deployed and maintained in a certain formation while covering the environment. The technique is analyzed theoretically and experimentally to verify its operation and performance within the Webots robot simulator, as well as on physical robots. Experimental results show that the described coverage technique with robot teams moving in formation can perform comparably with a technique where the robots move individually while covering the environment. The authors also quantify the effect of various parameters of the system, such as the size of the robot teams, the presence of localization, and wheel slip noise, as well as environment related features like the size of the environment and the presence of obstacles and walls on the performance of the area coverage operation.

A new mechanism of belt slip dynamic instability and noise in automotive accessory belt drive systems

This paper presents a new mechanism of V-ribbed belt (Micro-V™) dynamic instability and slip noise in accessory belt drive system of automotive engines. In this study, a set of experiments was conducted to investigate the properties of the belt noise and system dynamics using an industry standard test rig. A friction-induced system instability concept is proposed and an illustrative model is presented to elaborate the root cause of the system oscillations and the associated slip noise. This proposed new mechanism has correlated well with experimental results. This study is expected to provide accessory drive designers a completely new way to deal with the issues associated with improving the belt slip noise performance of accessory belt drive system.

Wet belt friction-induced dynamic instability and noise in Automotive Accessory Belt Drive Systems

This paper presents an investigation of V-ribbed belt (Micro-V TM ) wet friction and friction-induced slip noise in Accessory Belt Drive Systems (ABDS). A set of experiments was conducted by using an industry standard test rig and a standard material friction tester. A theoretical analysis and model are presented to elaborate the results. The tribological property of the interface is characterised to be unsteady mixed lubrication with water, which possesses the feature of negative slope of friction with velocity. The friction-induced dynamic instability and noises are also investigated. It is shown that the noise is directly associated with the negative slope of the friction-velocity curve.

A model and experimental investigation of belt noise in automotive accessory belt drive system

This paper presents a model to characterise V-ribbed belt (Micro-VTM) noise in accessory belt drive system (ABDS), or front-end accessory drive (FEAD) of automotive engines. It has been known that radial friction-induced vibrations generate belt misalignment noise and tangential friction-induced vibrations relates to belt slip noise. In this study, these two kinds of vibrations are found essentially different, and they are formulated mathematically by using forced vibration equation and self-excited vibration equation respectively. The formulations are consistent with conventional experimental results. A series of new tests were run to assess the properties of the belt noise using industry standard test rigs. The test results are agreeable with the results derived directly from the formulations. The proposed model is expected to provide accessory drive designers with insight into the issues associated with improving the overall noise performance of ABDS system.

Tangential slip noise of V-ribbed belts

This paper reports the results of a study into V-ribbed belt noise generated as a result of tangential belt slip. The results of experimental studies to identify the belt operating conditions associated with belt noise are presented, together with the results of analytical studies to identify the mechanism of noise generation. It is concluded that tangential slip V-ribbed belt noise generation is controlled only by the amount of slip, and that the mechanism of noise generation is harmonic excitation of the fundamental vibration mode of the belt, with stick—slip frictional behaviour providing the impetus for the vibration.

Tangential slip noise of V-ribbed belts

This paper reports the results of a study into V-ribbed belt noise generated as a result of tangential belt slip. The results of experimental studies to identify the belt operating conditions associated with belt noise are presented, together with the results of analytical studies to identify the mechanism of noise generation. It is concluded that tangential slip V-ribbed belt noise generation is controlled only by the amount of slip, and that the mechanism of noise generation is harmonic excitation of the fundamental vibration mode of the belt, with stick—slip frictional behaviour providing the impetus for the vibration.