Papers by Keyword: Disc Brake

Abstract: Brakes have huge importance on a bike with regards to safety. Proper structural sturdiness and superior heat dissipating capabilities provide better performance while braking and longevity to the system. Transient thermal and structural analysis of four Indian two-wheeler disc brakes is completed by using ANSYS 2021 R2 student version software. The comparison results provide comprehensive insight into the thermal and structural characteristics of all four-disc rotors used in the industry. A comparative conclusion with respect to performance of each disc rotor in the respective components of the analysis like, temperature, heat-flux, total deformation and equivalent stress analysis is presented in this paper.

Abstract: The distribution and the size of longitudinal dynamic forces that develop in the train body found in braking system are influenced by the length of the train. To determine these forces, it is used a mechanical model consisting of rigid bodies, representing the train vehicles, connected by elastic and damping elements with the nonlinear characteristic that shapes the buffer and draw-gear. The results based on numerical simulations highlight the emergence of dynamic longitudinal forces during braking, their evolution over time and the distribution of maximum compression and stretching forces that develop in buffer and draw-gear devices, for different lengths of the passenger train.

Abstract: It’s found that the rigid-body modes of brake pads and brake caliper have significant influence on squeal occurrence while analyzing disc brake squeal problems using close-loop coupling disc brake squeal model. The modal shapes of these rigid-body modes calculated from finite element method (FEM) are linear combination of multiple translational and rotational motions, which is unfavorable for further analysis. In this paper, method to achieve ‘pure’ rigid-body modes such as translations along and rotations on its principal axes of inertia is presented. Modal shapes derived from this method consist with those from FEM model under suitable constraints. The result is used in substructure modal composition analysis on a disc brake squeal problem, where the effects of specific rigid-body modes can be shown clearly. The method is helpful for researchers to choose right measures to suppress squeals.

Abstract: Based on three-dimensional models of key components, a thermoelastic finite element model of disc brake is established. The results of stress field and temperature distribution are acquired considering the relationship of heat convection coefficient and wheel angular velocity. The effect of heat convection coefficient fluctuation and disc material conductivity fluctuation on the model output is analyzed. The simulation results shows that disc temperature is not sensitive to heat convection coefficient, but sensitive to thermal conductivity. And this model mentioned in this paper is of great significant for building a temperature finite element model with engineering accuracy.

Abstract: With gradual increase of requirements for comfort and living environment,braking noise has become one of the issues concerned by people. The research and control to noise has become focus on designing and making braking systems. Based on associated test techniques and analysis theories, the corresponding test, spectrum analysis and coherence analysis are conducted, information about the noise and frequency spectrum is obtained; three-dimensional modeling and finite element calculation are conducted to its constituent components, natural frequency and vibration type figure are obtained. The basis for optimization of brake and reducing noise is provided.

Abstract: Brake judder is defined as disc or drum deformation-induced vibration which typically occurs at frequency less than 200 Hz. There are two types of brake judder namely, low speed (cold) judder and high speed (hot) judder. These two types of judder are often causing the brake pedal, steering wheel, suspension or chassis to vibrate. Consequently, it will affect comfort level of the driver and passengers. This paper focuses on the experimental investigation of low speed brake judder. In doing so, a laboratory test rig consists of disc brake unit, steering and suspension systems was used to assess level of brake judder vibration at different wheel turning angles. It was found that brake judder generated slightly high vibration at the steering wheel in the axial direction which led to a little uncomfortable feeling to the driver.

Abstract: Parameters of disc brake are calculated according to overall design requirements of the deicing vehicle. Based on the principles of its mechanical structure, ADAMS is used to set up the 3D model and simulate the braking performance. Simulation results show that the braking force of the model grows sharply and steadily and the braking distance satisfies the national standards. This progress provides a useful method to shorten the design cycles of special vehicle brakes, and to reduce its design costs.

Abstract: Calculation of car brake system design, also according to the known automotive related parameters is obtained by calculating the main parameters. The brake and braking torque, braking moment and braking force distribution coefficient and hydraulic brake drive mechanism related parameters. Finally, the braking performances are analyzed in detail.

Abstract: According to the real dimension of the braking disc, the finite element modeling for three-dimensional transient cyclic symmetry during the long downhill braking is established. The distribution of the transient temperature field of the brake disc during the braking are analyzed. The variation of the friction factor combined with the temperature characteristics of the friction factor during the braking are analyzed. The analysis result show: During the braking, the temperature of the brake rises increasingly and reaches the top temperature of 316.04°C at the end of braking process, the high temperature section concentrates in the far area of the friction surface; The changes of the friction factor is relatively stable during the long downhill braking. There is no obvious thermal recession. (Abstract)

Abstract: The safety and reliability of railway vehicle braking system is put forward higher requirement for railway speed increasing. Compared with domestic product, foreign disc brake unit has obvious advantage on compactness of structure, stability of braking pad friction coefficient, braking power, safety and reliability etc. Thus, the research has theoretical significance and engineering value. Firstly, the working principle of disc brake unit is obtained by performing spatial mechanisms analysis of some imported disc brake unit and adjuster structure, then using MBD (Multi-body Dynamics) simulation software, by importing the geometric model of brake unit into RecurDyn, to make preprocess of simplifying and merging and add constraints and contact relation, driving control functions, etc, finally to establish a simulation experiment model. The working characteristic of the brake unit and adjuster's displacement curve of clearance compensation is obtained through the braking and releasing simulation results of braking pad before and after wear out. The research results provide a method based on virtual prototype for analyzing and validating working mechanism of disc brake unit.