Abstract
AbstractIn this work a multilevel Computational Fluid Dynamics (CFD) analysis has been applied for the design of a Formula race car exhaust muffler with improved characteristics of sound pressure level (SPL) and fluid dynamic response. The approaches developed and applied for the optimization process range from the 1D to fully 3D CFD simulation, exploring hybrid approaches based on the integration of a 1D model with 3D tools. Modern mufflers typically have a complex system of chambers and flow paths. There are a variety of sound damping and absorbing mechanisms working to quiet the sound flowing through a muffler and piping system. Two calculation methods were selected for this study. The muffler has a complex inner structure containing perforated pipe and fiber material. Computer-aided design (CAD) file of the muffler was established for developing Finite Element Analysis (FEA) model in AVL BOOST v2017 and another commercial advanced design software (SolidWorks 2017). FEA model was made to monitor the flow properties, pressure and velocity. After the model was verified, sensitivity studies of design parameters were performed to optimize the SPL of the muffler. The software analysis results are included in the paper. Recommendations are made for obtaining smoother SPL curves for various measurement methods.
Highlights
The design of a muffler plays an important role in the overall Noise, vibration and harshness (NVH) performance of a Formula race car
In this work a multilevel Computational Fluid Dynamics (CFD) analysis has been applied for the design of a Formula race car exhaust muffler with improved characteristics of sound pressure level (SPL) and fluid dynamic response
Most of the fluid in the internal of PPiP muffler directly entered into the muffler volume from the perforated pipe
Summary
The design of a muffler plays an important role in the overall Noise, vibration and harshness (NVH) performance of a Formula race car. The control of both the level and quality of formula race car engine parts noise is a key aspect of the design process of a new engine powertrain system, in order to satisfy the legislation limits and provide a characteristic exterior sound [1]. The attenuation of gas dynamic noise relies on suitable reactive and dissipative with hybrid mufflers, designed and optimized to damp or emphasize certain spectral components of the engine noise. The objective of this paper is to conduct a sensitivity analysis of Formula Student race car muffler on three key design parameters, i.e. partition (perforated pipe) location, chamber volume variation, and inserting absorbent material in a reactive muffler. Mohamad [2] presented in his technical paper an efficient process to optimize
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