Download or read book Thermo elastic Deformation of a Vented Brake Disc written by David Bryant and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of retarding a moving vehicle or object in a controlled manner has been investigated over hundreds of years with many different solutions being developed over the years. As time has progressed a common overall design has almost uniformly been agreed upon for vehicle use; a brake disc and caliper or brake drum arrangement. As vehicle refinement has improved there has been increasing focus on the refinement of such designs with regards to their noise, vibration and harshness (NVH)characteristics. Whilst brake noise has had significant research analysing its cause, effect and solutions, brake judder has had less research focussed upon it. The principal reason for past research priorities and the recent interest in judder is because of the increased demands being placed on brakes? higher power absorption with lighter structures. The subject of this thesis was to address the least known phenomena of brake judder, that of the thermo-elastic deformation of vented brake discs. The research utilised experimental, analytical and empirical methods to give a broader understanding of the transient deformation process, both thermo-plastic and thermo-elastic, of a high performance vehicle disc brake. Initial characterisation of thermal judder was carried out on-vehicle where it was identified that brake pressure could be used as a reliable indicator to show the developing nature of this phenomenon. The brake pressure pulsation was shown to change from low order (first or second order) to high order (up to eighth order) over the duration of a high speed vehicle brake test which involved up to thirty braking events. The pressure pulsation indicated a link to brake disc deformation with the magnitude and order of brake pressure variation increasing with increasing disc temperature. The highly dynamic, transient, nature of brake disc distortion was also investigated on a bespoke quarter car suspension brake dynamometer. Thermoelastic wave-like deformation was shown to occur during the process of a single braking event with the order of deformation corresponding to the brake pressure variation. The order of this wave-like deformation was shown to be linked to the amount of energy transferred into the braking system with higher energy braking events resulting in higher order deformation. Thermal images of the brake disc have shown an equispaced formation of hot-spots on the inboard and outboard friction ring surfaces which was linked to the disc waveform. The wave-like deformation was attributed to circumferential buckling of the brake disc as suggested by Lang [1]. This resulted from rapid thermal expansion of the friction rings due to the sudden - 4 - influx of heat during braking. Thermal gradients between the hot and cold regions of the brake disc constrained the radial thermal expansion of the friction ring and caused compressive stresses to build up. When the tangential load causing the stress was in excess of the critical buckling load, buckling of the brake disc occurred with the mode order of the buckled disc related to the temperature of the friction ring. Stress relieving of the brake disc was shown to occur during brake testing on the brake dynamometer causing a thermo-plastic effect. This?in service? stress relieving effect removed the retained stresses resulting from the casting and machining processes and allowed the disc to adopt a second order mode of deformation. Data from the on-vehicle and dynamometer testing was used to generate and validate finite element analysis simulations which were used to investigate thermal inputs and heat dissipation from the brake disc. These findings were then combined with that of an associated aerodynamic study [2] to generate a modified brake disc vent profile which reduced the surface temperature variation, thermal gradients and maximum disc temperature. On-vehicle testing of the prototype design showed an average 14% reduction in maximum disc temperature and it was proposed that this would reduce the propensity for the disc to generate judder by reducing the thermal deformation of the brake disc.

Download or read book Braking of Road Vehicles written by Andrew J. Day and published by Butterworth-Heinemann. This book was released on 2022-03-21 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: Braking of Road Vehicles, Second Edition includes updated and new subject matter related to the technological advances of road vehicles such as hybrid and electric vehicles and "self-driving" and autonomous vehicles. New material to this edition includes root causes, guidelines, experimental and measurement techniques, brake NVH identification and data analysis, CAE and dynamic modelling, advances in rotor and stator materials, manufacturing methods, changes to European and US legislation since 2014, recent developments in technology, methods and analysis, and new and updated case studies. This new edition will continue to be of interest to engineers and technologists in automotive and road transport industries, automotive engineering students and instructors, and professional staff in vehicle-related legislational, legal, military, security and investigative functions. Completely revised to keep up-to-date with the demands and requirements of a new generation of road vehicles Includes new chapters on Autonomous and Regenerative Braking, Brake-by-Wire and Electronic Braking Systems Addresses issues such as prediction of brake performance, component stresses and temperatures, and durability Discusses operational problems such as noise and judder, variable torque generation and variable deceleration

Download or read book A Thermal Thermoelastic and Wear Analysis of High energy Disk Brakes written by and published by . This book was released on 1974 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermo elastic Deformation of a Circular Disc Containing a Central Circular Hole written by Ronald S. Rivlin and published by . This book was released on 1956 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal Buckling of Automotive Brake Discs written by Chunye Ma and published by . This book was released on 2004 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frictionally excited Thermoelastic Instability in Automotive Disk Brakes written by Kwangjin Lee and published by . This book was released on 1993 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermoelastic Finite Element Analysis of Heavy duty Truck Brake Discs written by T. Hadjipanayotou and published by . This book was released on 2000 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermoelastic Contact Problems in Automotive Brakes and Clutches written by Jiayin Li and published by . This book was released on 2006 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermoelastic Effects in Automotive Brakes written by Shuqin Du and published by . This book was released on 1997 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermoelastic Instabilities in Automotive Disk Brakes and Clutches written by Yun-Bo Yi and published by . This book was released on 2001 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Thermal Thermoelastic and Wear Analysis of High Energy Disk Brakes written by Francis E. Kennedy and published by . This book was released on 1974 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Models for Transient Thermoelastic Instability in Disk Brakes written by Su Zhang and published by . This book was released on 2001 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermal Deformation Analysis Disc Brake Squeal written by Muhammad Zahir Hassan and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aero thermal Characteristics of an Automotive CCM Vented Brake Disc written by Giovanna Barigozzi and published by . This book was released on 2005 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Thermoelastic Analysis of Functionally Graded Materials Brake Disks with Single and Double Side Contact Areas written by Ali Akbar Khalili and published by . This book was released on 2010 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Brake Design and Safety written by Rudolf Limpert and published by SAE International. This book was released on 1999-07-16 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was written to help engineers to design safer brakes that can be operated and maintained easily. All the necessary analytical tools to study and determine the involvement of brakes in accident causation are included as well as all essential concepts, guidelines, and design checks.

Download or read book Analysis and Design of Automotive Brake Systems written by United States. Army Materiel Development and Readiness Command and published by . This book was released on 1976 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: