K. Srinivasan

Bio: K. Srinivasan is an academic researcher from Anna University. The author has contributed to research in topics: Disc brake & Brake. The author has an hindex of 2, co-authored 2 publications receiving 13 citations.

Modelling of automotive disc brake squeal and its reduction using rotor design modifications

Abstract: This paper proposes a numerical approach to reducing disc brake squeal through rotor design modifications using the finite element method (FEM). The finite element (FE) model is validated based on the measured data extracted from experimental modal analysis for individual brake components in free-free boundary condition and brake assembly under applied pressure. The FE model is used to investigate brake squeal through two numerical approaches namely complex eigenvalue analysis and dynamic transient analysis. Experimental squeal tests are performed using a brake test rig for verification of the predicted results. It is observed that the results of both the complex eigenvalue analysis and dynamic transient analysis agree well with experimental squeal frequencies. In order to reduce brake squeal, a number of structural modifications on the disc are evaluated. The predicted results show that the squeal noise of disc brake is influenced by the natural frequency of the brake rotor and its mode shape. It is also found that a good choice of rotor geometry in the pre-design stage could help in reducing squeal noise.

Reduction of automotive brake squeal through pad geometrical modifications: A numerical study

Abstract: Reducing brake squeal noise for the improvement of ride comfort is one of the most important issues in today's automotive industry. This study details an investigation into the design modification of a brake pad for the front disc brake system as found on a typical passenger vehicle, and reports how the design modification can be improved to reduce the occurrence of squeal. As an extension to earlier finite element (FE) brake models described in literature, a detailed FE model of the whole disc brake corner is developed and validated using experimental modal analysis. Stability analysis of the disc brake corner using the FE software ABAQUS is carried out to predict squeal occurrence. To reduce squeal noise, stability analysis was conducted for several geometrical modifications on the pad. The results show that squeal could be reduced if the back plate and friction material thickness are increased.

Brake saueal analysis by finite elements

Abstract: An approximate analysis method for brake squeal is presented. Using MSC/NASTRAN, a geometric nonlinear solution is run using a friction stiffness matrix to model the contact between the pad and rotor. The friction coefficient can be pressure dependent. Next, linearised complex modes are found where the interface is set in a slip condition. Since the entire interface is set sliding, it produces the maximum friction work possible during the vibration. It is a conservative measure for stability evaluation. An averaged friction coefficient is measured and used during squeal. Dynamically unstable modes are found during squeal. They are due to friction coupling of neighbouring modes. When these modes are decoupled, they are stabilised and squeal is eliminated. Good correlation with experimental results is shown. It will be shown that the complex modes base-line solution is insensitive to the type of variations in pressure and velocity that occur in a test schedule. This is due to the conservative nature of the approximation. Convective mass effects have not been included.

Recent Research on Vehicle Noise and Vibration

Abstract: Vehicle noise, vibration and harshness (NVH) is usually among the top five attributes in terms of its priority in the design of automotive vehicles. Its priority in other types of vehicles (e.g., aerospace) is also important. Like other attributes of safety, performance, dynamics, fuel economy, NVH has to be considered closely in the design process. This manuscript presents a summary of recent research in the general area of NVH with an emphasis in the automotive field. It follows up on a previous review and classifies the phenomena by the main sources of NVH into powertrain, road and tyre, wind and other NVH. The last includes brake and chassis, squeak and rattle, electromechanical NVH, exterior (or drive-by) NVH and others. The paper provides a review of some of the recent literature in this field.

Effects of Young's Modulus on Disc Brake Squeal using Finite Element Analysis

Abstract: This paper is concerned with the disc brake squeal problem of passenger cars. The objective of this study is to develop a finite element model of the disc brake assembly in order to improve the understanding of the influence of Young’s modulus on squeal generation. A detailed finite element model of the whole disc brake assembly that integrates the wheel hub and steering knuckle is developed and validated by using experimental modal analysis. Stability analysis of the disc brake assembly is conducted to find unstable frequencies. A parametric study is carried out to look into the effect of changing Young’s modulus of each brake’s components on squeal generation. The simulation results indicate that Young’s modulus of the disc brake components plays an important role in generating the squeal noise.

Effects of material properties on generation of brake squeal noise using finite element method

Abstract: THIS PAPER IS CONCERNED WITH THE DISC BRAKE SQUEAL PROBLEM FOR PASSENGER CARS. THE OBJECTIVE OF THE PRESENT RESEARCH IS DEVELOPING A FINITE ELEMENT MODEL OF THE DISC BRAKE ASSEMBLY IN ORDER TO IMPROVE UNDERSTANDING OF THE INFLUENCE OF YOUNG€™S MODULUS ON SQUEAL GENERATION. A DETAILED FINITE ELEMENT MODEL OF THE WHOLE DISC BRAKE ASSEMBLY THAT INTEGRATES THE WHEEL HUB AND STEERING KNUCKLE IS DEVELOPED AND VALIDATED USING EXPERIMENTAL MODAL ANALYSIS. STABILITY ANALYSIS OF THE DISC BRAKE ASSEMBLY IS ACCOMPLISHED TO FIND UNSTABLE FREQUENCIES. A PARAMETRIC STUDY IS CARRIED TO LOOK INTO THE EFFECT OF CHANGING YOUNG€™S MODULUS OF EACH BRAKE COMPONENTS ON SQUEAL GENERATION. THE RESULTS OF SIMULATION INDICATED THAT YOUNG€™S MODULUS OF DISC BRAKE COMPONENTS PLAY A SUBSTANTIAL ROLE IN GENERATING THE SQUEAL NOISE.