Experimental Evaluation on Vehicle Aerodynamic Noise Performance
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In this study, a passenger car was tested for its aerodynamic noise performance in terms of sound pressure level in the wind tunnel at Tongji University (Shanghai Automotive Wind Tunnel Center), where the phase microphone array was used along with sound surface microphones and artificial heads combining with the adhesive tape sealing method. The wind noise sources, the noise level on the exterior surface and the sealing influence on the interior noise level were evaluated. Based on datum of the tested subject, the potential design problem associated with the body structure and seals are identified, the main aerodynamic noise sources and their transfer path are located. The details about the setup of the experiment, data collection and processing method offered in this study can be used to not only help improve the tested vehicle aerodynamic noise performance, but also provide a long-term reference value for the aero-noise research community.Abstract This paper will address the engineering performance differentiators for an F1 car and highlight the difference aerodynamics can make to that performance. It will also consider some basic aerodynamic challenges and the main tools used for aerodynamic exploration by teams.
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The aim of the paper is to approach the issue of simulations in aerodynamics. To describe the physical rules and basic mathematical equations, which are essential in the use of computing techniques. The paper deals with CFD (Computational Fluid Dynamics) and informations which are necessary for its understanding, the author further describes different software programs used for simulation purposes. By means of analyzing technical papers, the author compares and describes software considering to their practical use. The author also describes the aerodynamic tunnels and clarifies the basic issues related to aerodynamic tunnels and discuss factors that affect the resulting measurement quality. The author deals with methods of measuring individual physical quantities that are the interest of simulation or measurement. At the end of the paper, the author compares the specific aerodynamic tunnels and the possibilities of measurements that aerodynamics tunnels provide.
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The aerodynamic noise around vehicles at high speeds has become increasingly important and in more and more cases dominates the vehicle noise.It is attributable to the facts that the noises from engine,tire,power train and other noise sources have been signiflcantly reduced and the speeds of vehicles constantly increase in the past decades.It is crucial to carry out the study of aerodynamic noise and explore proper countermeasures for suppressing its contribution to the vehicle noise.In this paper,the integral formulations for the calculation of the aerodynamic noise around high speed vehicles is abstained through the solution of generalized Lighthill's equation.After the formulation is analyzed and suitably simplified according to work condition of vehicles,it becomes clear that their aerodynamic noise is dominated by dipole noise and the fluctuating pressure on outside surface of vehicle is main aerodynamic noise source. Some characteristics of aerodynamics noise around vehicles are discussed and tested. 4 figs,6 refs.
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From conceptual to preliminary design: Aerodynamic characterization of MR5 civil high-speed aircraft
This paper reports the aerodynamic characterization of MR5 civil high-speed aircraft, studied in the field of the MORE&LESS project. At each step, the accuracy of the aerodynamic analysis is increased. The analysis starts from simplified methods already available in literature, which allow us to have a first estimation of the aerodynamics. Then, CFD analysis is performed to have a more detailed characterization. Moreover, a test campaign will be performed to complete the aerodynamic investigation. Eventually, mission simulation is used to validate the vehicle performance along the reference route.
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In order to improve the feasibility of space missions, the prediction accuracy of rarefied aerodynamics is one of the important factors. To improve rarefied aerodynamic predictions, the determination of accommodation coefficients and direct measurement of rarefied aerodynamic forces are crucial. Thus, at Japan Aerospace Exploration Agency, a hypersonic rarefied wind tunnel has been developed for rarefied aerodynamic measurements. In this work, we have utilized both experimental and numerical approaches for rarefied hypersonic aerodynamic measurements, and the measurement schemes have been developed by using pendulous models for accommodation coefficients and for aeroshell aerodynamic characteristics. Consequently, we have successfully demonstrated measurements of accommodation coefficients and rarefied aerodynamic characteristics for an aeroshell.
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Aerodynamics is a very important topic which has uses in a wide array of fields and is involved in things that range from bridges to spacecrafts. Despite this, most aerodynamic tests are performed only one of two ways, using extremely expensive wind tunnels or by using CFD (computational fluid dynamics) simulation. Both of these preexisting methods have flaws however, with wind tunnels costing gargantuan amounts of money and CFD methods consuming large amounts of energy. These flaws have prompted scientist and engineers to actively seek new solutions and methods that will help to address the cost and energy issues associated with the other two methods. This search has been to no avail so far as new novel methods have not been found until now. I have found a new method that concerns the use of light in order to test the aerodynamics of objects. To prove the feasibility, I have experimented using this method and have found it to accurately simulate aerodynamics behavior in all cases tested by me. This discovery is rather significant as it would lead to a substantial shift in the field of testing aerodynamics.
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Based on the aerodynamics and the finite elements techniques,the computational fluiddynamics(CFD) model was developed.Usingthree different kinds of models,solutions of the surfaceboundary layer generation on complex structure wheel and the mesh generation between wheel androad surface were made.The RNGk-eturbulent model was introduced to study the aerodynamic dragcoefficient of wheel.Investigation ai ms to present a renovate way to design automotive wheels basedon aerodynamics.
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There is very important relationship between aerodynamics and automobile modeling. The progress of aerodynamics accelerates the improveme nt of automobile modeling, and meanwhile the new automobile modelings can also h elp the develpment of aerodynamics. Furthermore, the developing trend of the fut ure automobile modeling is analyzed and predicted in this paper.
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