共查询到19条相似文献,搜索用时 156 毫秒
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在内燃机振动控制中,整机振动控制非常重要。为了在各工况下达到比较理想的减振效果,以内燃机振动速度为控制目标,采用了闭环主动减振控制方法。采用这种方法可以改善内燃机整机振动特性,提高内燃机工作效率和整车运行的稳定性。 相似文献
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压电陶瓷是一种典型且应用广泛的新型智能材料,能改善汽车振动主动控制效果。文章以压电陶瓷为作动执行元件,设计了自适应神经网络控制系统,并进行了仿真分析、四边简支矩形薄板振动主动控制试验以及轿车车身板件的振动主动控制试验与研究。结果表明,以压电陶瓷为执行元件的自适应神经网络控制能够取得较好的减振效果,这不仅有助于现有轿车振动和噪声主动控制技术问题的解决,而且为其它类似应用提供了参考。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):193-216
This paper presents vibration control of a passenger vehicle using an electronically controllable electro-rheological (ER) engine mount. A mixed-mode ER engine mount operating under the flow and shear modes is devised and manufactured. After establishing the dynamic model of the proposed ER engine mount, both field-dependent displacement transmissibility and dynamic stiffness of the ER engine mount are empirically evaluated. The ER engine mount is then incorporated with a full-vehicle model in order to investigate vibration control performance at the driver's seat position. The governing equation of motion of the full-vehicle model is formulated by considering engine excitation force, followed by designing a skyhook controller to attenuate unwanted vibration. The controller is implemented through a hardware-in-the-loop simulation (HILS), and control responses such as acceleration level at idle speed are evaluated in the frequency and time domains. 相似文献
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Seung-Bok S. Choi Hyun-Jeong H. Song 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2002,37(3):193-216
This paper presents vibration control of a passenger vehicle using an electronically controllable electro-rheological (ER) engine mount. A mixed-mode ER engine mount operating under the flow and shear modes is devised and manufactured. After establishing the dynamic model of the proposed ER engine mount, both field-dependent displacement transmissibility and dynamic stiffness of the ER engine mount are empirically evaluated. The ER engine mount is then incorporated with a full-vehicle model in order to investigate vibration control performance at the driver's seat position. The governing equation of motion of the full-vehicle model is formulated by considering engine excitation force, followed by designing a skyhook controller to attenuate unwanted vibration. The controller is implemented through a hardware-in-the-loop simulation (HILS), and control responses such as acceleration level at idle speed are evaluated in the frequency and time domains. 相似文献
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基于虚拟仪器技术,借助于传感器、信号调理器和数据采集卡等硬件,应用NILabVIEW软件编制了振动数据采集与处理程序,研制了发动机振动测试系统。利用该系统进行了发动机缸盖螺栓拧紧力矩与机体振动量关系的振动测试,得到了机体振动量较小时对应的螺栓最佳拧紧力矩范围,且与发动机生产厂家推荐的数据比较吻合,从而验证了所研制振动测试系统的可行性和正确性。 相似文献
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为解决汽车加速扭转共振问题,探讨了某款柴油车在1 700 r/min左右产生的扭振和共鸣声的机理,可通过改变相关件的扭振频率及增加扭振阻尼来解决此问题.在没有双质量飞轮的情况下,最终通过调整离合器扭转减振器的刚度和阻尼,以及与传动轴挠性联轴器的组合运用,消除了该车型的扭振问题.结果表明,扭振是由系统共振引起,在扭振的源头采取对策才是最有效的方法. 相似文献
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柴油机结构振动和辐射噪声特性研究 总被引:1,自引:0,他引:1
集多体动力学方法、有限元方法、声学边界元方法于一体,对某柴油机结构振动和结构辐射噪声特性系统地开展了数值预测和分析工作。通过模态试验数据修正了发动机各部件及组合结构有限元模型,确保了有限元模型的合理性。由计算所得发动机结构表面的振动速度值和试验值变化趋势一致,在部分频率段吻合较好。基于表面振动速度法通过Matlab编程获得了各部件的声功率级及其排序,能够有效地指导低噪声设计工作。通过有限元和边界元方法分别对不同激励工况下发动机结构振动响应和声学响应进行了预测,通过分析可知,在低频段范围内活塞激励和燃烧激励相对阀系激励对整机辐射噪声的影响大,高频段辐射噪声主要集中在1 700Hz左右频段,其中,阀系激励对该频段范围内辐射噪声的影响较大。 相似文献