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Tuesday, November 2, 2010

Based on virtual prototype car disc brake squeal of brakes

In the 21st century, the car has become essential to people's lives is one of transportation, the popularity of cars make people's life quality has been further improved, but with the popularity of the car, with the convenience of life has come a series of issues, including environmental noise pollution is a major issue to be addressed. Taking a physical prototype car disc brake, the vibration theory, the three-dimensional design software, CATIA V5 R17, fast automatic exchange of data-specific software CADFIX 7.1 ANSYS9.0 and finite element analysis software as a tool for workers in some of the brake When the status of the problem is easy to produce brake squeal, the brake optimize the structure parameters. Firstly, the use of three-dimensional design software, CATIA V5 R17 Design of mechanical parts (PDG: Part Design) and the assembly design (ASD: Assembly Design) modules, combined with bottom-up (BOTTUM-UP) and top-down (TOP-DOWN) two modeling methods to model disc brake, and then use movement mechanism simulation (KIN: DMU Kinematics) module of the model simulation, the various components in determining the model structure size is reasonable, well after the assembly of each simulation exercisecomponents can be simplified, remove the accuracy of finite element analysis calculation is small but great impact on the chamfer, hole and other structural elements, the finite element analysis for the next step to prepare, and then fast automatic exchange of data dedicated CADFIX 7.1 software will be built in the CATIAV5 R17 in the order * modle format of the disc brake parts and components model into various formats Prosolid 14.0, so that three-dimensional model built into the file format can be imported ANSYS9.0. ANSYS9.0 into the model, according to the disc brakes to find all parts of the material properties and historical test data, finite element modeling of disc brakes, the completion of unit selection, meshing, boundary conditions and computational constraints frequency range of settings, using Block Lanczos (block) method of modal analysis model to determine the structure of the natural frequencies and mode shapes, from the structural parameters to identify the parts easy to produce brake squeal, and then CATIA V5 R17 irrational parts of the structural design of the structure to optimize the design, and then optimize the design of the parts again after the modal analysis, so the cycle of work, makes sure the vibration mode to improve. The study shows that by improving the structure of the method can effectively improve the disc brake structure of the amplitude of velocity to suppress the occurrence of brake squeal. 
 
Keywords: disc brake, brake noise, modal analysis, CATIAV5 R17, ANSYS9.0

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