The multi-body dynamics model of the X6170ZC diesel is established to analyze vibration and acoustic noise. The high quality finite element and simulation models are developed, and nonlinear springs are used to imitat...The multi-body dynamics model of the X6170ZC diesel is established to analyze vibration and acoustic noise. The high quality finite element and simulation models are developed, and nonlinear springs are used to imitate the joints of engine components. The acoustic behavior of the structure is evaluated by the velocity of surface vibration. The noise level is reduced by improving the structure of the engine. The result shows that the surface vibration velocity level is decreased about 3.7 dB (A) at 1 600 Hz after the optimization. Based on the contrast between the two structures, it is concluded that through structure design the combined noise can be reduced, and the virtual design mode of diesel engines is feasible.展开更多
耳蜗的工作机理、声音信号的主动放大机制与柯蒂氏器(Organ of Corti)的微观运动有关。目前主要依赖动物实验进行观测并给出解释。侵入式实验方法会破坏耳蜗部分结构影响其正常工作,但是计算机仿真能够提供了对耳蜗机制进行更深入研究...耳蜗的工作机理、声音信号的主动放大机制与柯蒂氏器(Organ of Corti)的微观运动有关。目前主要依赖动物实验进行观测并给出解释。侵入式实验方法会破坏耳蜗部分结构影响其正常工作,但是计算机仿真能够提供了对耳蜗机制进行更深入研究的手段和方法。通过建立有限元模型的方法不仅可以再现实验的观测结果,还可以验证实验工作中提出的一些假设或者指导未来实验的设计。本文在Comso l5.6中建立豚鼠耳蜗的三维分段模型,包括柯蒂氏器详细的微观生理结构。展开更多
文摘The multi-body dynamics model of the X6170ZC diesel is established to analyze vibration and acoustic noise. The high quality finite element and simulation models are developed, and nonlinear springs are used to imitate the joints of engine components. The acoustic behavior of the structure is evaluated by the velocity of surface vibration. The noise level is reduced by improving the structure of the engine. The result shows that the surface vibration velocity level is decreased about 3.7 dB (A) at 1 600 Hz after the optimization. Based on the contrast between the two structures, it is concluded that through structure design the combined noise can be reduced, and the virtual design mode of diesel engines is feasible.
文摘耳蜗的工作机理、声音信号的主动放大机制与柯蒂氏器(Organ of Corti)的微观运动有关。目前主要依赖动物实验进行观测并给出解释。侵入式实验方法会破坏耳蜗部分结构影响其正常工作,但是计算机仿真能够提供了对耳蜗机制进行更深入研究的手段和方法。通过建立有限元模型的方法不仅可以再现实验的观测结果,还可以验证实验工作中提出的一些假设或者指导未来实验的设计。本文在Comso l5.6中建立豚鼠耳蜗的三维分段模型,包括柯蒂氏器详细的微观生理结构。
