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Cooling efficiency is an important index for the performance evaluation of cooling unit for hydraulic system. Sucking oil with higher temperature into cooling unit is helpful to increase the cooling efficiency. This requires the suction port be set as close as possible to oil surface, because the oil with high temperature is always close to oil surface. But, setting suction port too close to the oil...
For the analysis of car interior noise at high speed, the influence of autobody aerodynamics should be taken into account, besides the vibration and acoustic radiation of powertrain, the random excitation from road and the vibration inputs of tires, and so on. A model of CFD was built. And the most turbulent area of autobody surfaces was located. The spectrum of average aerodynamic pressure of monitoring...
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