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The acoustic cavity resonance inside the tire–wheel assembly is known to contribute to audible noise in the passenger compartment of vehicles. To obtain control methods of tire acoustic cavity resonance, its characteristics and producing mechanism need to be clarified first. In this article, the finite element model of a tire coupled with acoustic medium in the tire cavity is constructed. The Euler method is introduced to study the modal characteristics of tire cavity under the influence of tire inflation pressure, load, and tire rotation velocity. Frequency splitting phenomena under four separate conditions (stationary tire without load, stationary tire with load, rotating tire without load, and rotating tire with load) are simulated and analyzed. The slope change of the resonance frequency as a function of rotation speed is found to be close to the reciprocal of tire radius which can be explained by a model of wave propagation in a ring-shaped channel with moving media inside the ring. The obtained function of the slope change can help determine the frequency variation range under different vehicle velocity, structure load, and tire inflation pressure, which can then help to control the cavity resonance energy and provide a more comfortable driving experience.

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This paper describes the design, working principle, as well as calibration of an air-floating six-axis force measurement platform, where the floating plate and nozzles were connected without contact, preventing inter-dimensional coupling and increasing precision significantly. The measurement repeatability error of the force size in the platform is less than 0.2% full scale (FS), which is significantly better than the precision of 1% FS in the six-axis force sensors on the current market. We overcame the difficulties of weight loading device in high-precision calibration by proposing a self-calibration method based on the floating plate gravity and met the calibration precision requirement of 0.02% FS. This study has general implications for the development and calibration of high-precision multi-axis force sensors. In particular, the air-floating six-axis force measurement platform could be applied to the calibration of some special sensors such as flexible tactile sensors and may be used as a micro-nano mechanical assembly platform for real-time assembly force testing.

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Abstract-In the air-floating six-axis force measurement platform, parallelism between the nozzle and the floating plate directly affects the machine's accuracy. For some reason about the structure of the flotation six-dimensional force measurement platform, we cannot use the conventional method to test on the parallelism between the nozzle and floating plate. This paper analyzes that how the parallelism between the nozzle and the floating plate affect the accuracy of flotation force measurement platform. Based on that we proposed a method of using indentation principle and equalthickness gasket principle to detect the parallelism between the nozzle and floating plate, and experiments proved the effectiveness of the proposed method, solving the problem of parallelism detection between the nozzle and the floating plate in the process of installing and commissioning the flotation six-dimensional force measurement platform.

Abstract-In order to solve the prevailing formalism of College Students' production practice , this paper deeply analyzes the roots of unwelcome current passive production practice and puts forward an active mode of production practice from the perspective of corporate interests, which is based on little research .The mode mixes enterprise technical requirements and production practice together, which realize win-win benefit between enterprises and universities. Practice has proved that this production practice mode can not only fully mobilize the enthusiasm of the enterprises, but also can improve the effect of production practice.