A Functional Virtual Prototyping full vehicle model for a tri-axial heavy-duty truck is built, and the nonlinearity of suspension dampers and tires is also considered. With the trajectory of full vehicle gravity center, longitudinal tire force of front wheel, longitudinal acceleration, lateral acceleration, yaw rate and pitch angle as the evaluation indexes of brake property, the influences of ...

Ghana in recent years has seen dramatic increase in vehicular growth. Vehicular transport in Ghana is growing with increased socio economic activities. With so many cars on our roads, the rate of vehicular accident has also increased with many people died or sustained serious injuries in traffic accidents. This study reports on the brake failure and its effect on road traffic accident in the Ku...

We have previously demonstrated an abnormally delayed mean brake response time and an increased frequency of abnormally delayed brake responses in a group of neuropathic diabetic drivers compared with a control group of drivers with neither diabetes nor lower extremity neuropathy. The objective of the present case-control study was to compare the mean brake response time between neuropathic dia...

A Magneto-Rheological (MR) fluid brake is a device to transmit torque by the shear force of an MR fluid. An MR rotary brake has the property that its braking torque changes quickly in response to an external magnetic field strength. In this paper, the design method of the cylindrical MR fluid brake is investigated theoretically. The mechanical part is modeled using Bingham’s equation, an approa...

The measurement of brake squeal vibrations is a difficult problem, because the rotating disc does not allow any physical contact with the sample during measurement. The use of accelerometers is difficult and very time consuming. Non-contact scanning techniques (e.g. vibrometers) are widely used for these applications, and although they provide a very high temporal resolution is available, still...

In this paper, we present a system to perform automated mechanical diagnosis of a car's brake system. The diagnostic process is performed by using the Generic Tasks of Hierarchcial Classiication and Routine Recognition. A classiication hierarchy is used to represent the possible malfunctions of a car's brake system. The two Generic Tasks are used to traverse the malfunction hierarchy in an atte...

This report describes the development and experimental validation of a coordination scheme between friction and discretely variable compression brakes for a Class 8 Freightliner truck used as a development platform in the California PATH program. The coordination scheme that we developed maintains the speed tracking performance of the nominal PID controller which was originally designed by the ...

Brake squeal relating to the application of tread block brakes on rail cars can generate significant noise annoyance issues and presents a challenging problem due to the associated technical complexities as well as inherent design constraints. In this paper the phenomenon of brake squeal occurring on a rail vehicle is investigated using experimental techniques. The operational vibration respons...

The friction forces generated during braking between brake pads and discs produce high thermal gradients on the rubbing surfaces. These thermal gradients may cause braking problems such as brake fade, premature wear or hot spotting and the associated hot judder phenomenon in the frequency range below 100 Hz. Further consequences are comfort reductions, a defective braking process, inhomogeneous...

In order to improve the response performance of a proportion integration differentiation (PID) controller for magnetorheological fluids (MRF) brake and to reduce the braking fluctuation rate, an improved fruit fly optimization algorithm for PID controller parameters tuning of MRF brake is proposed. A data acquisition system for MRF brake is designed and the transfer function of MRF brake is ide...