针对某MT(Manual Transmission,简称MT)车型加速换挡杆振动问题,基于客观测试,首先按照振动源→振动传递路径→响应端表现的分析方法,对整个振动传递路径展开研究。然后考虑该MT车型换挡杆振动的传递路径,运用HyperMesh、Nastran等软件...针对某MT(Manual Transmission,简称MT)车型加速换挡杆振动问题,基于客观测试,首先按照振动源→振动传递路径→响应端表现的分析方法,对整个振动传递路径展开研究。然后考虑该MT车型换挡杆振动的传递路径,运用HyperMesh、Nastran等软件对振动源(变速器换挡机构)、响应端(换挡杆)进行NVH分析,确认其中变速器换挡机构为振动源,换挡杆为响应端,最后对振动传递路径(换挡拉索)进行隔振试验验证。研究发现,换挡杆振动受到变速器换挡机构弹性体模态大小、换挡拉索隔振优劣的影响显著,研究所提出的振动源、振动传递路径的优化策略为相关项目的NVH(Noise,Vibration and Harshness)性能开发奠定了基础。展开更多
By investigating a stochastic model for intracellular calcium oscillations proposed by Hfer,we have analyzed the transmission behavior of calcium signaling in a one-dimensional two-way coupled hepatocytes system.It ...By investigating a stochastic model for intracellular calcium oscillations proposed by Hfer,we have analyzed the transmission behavior of calcium signaling in a one-dimensional two-way coupled hepatocytes system.It is shown that when the first cell is subjected to the external noise,the output signal-to-noise ratio(SNR) in the cell exhibits two maxima as a function of external noise intensity,indicating the occurrence of stochastic bi-resonance(SBR).It is more important that when cells are coupled together,the resonant behavior in the 1st cell propagates along the chain with different features through the coupling effect.The cells whose locations are comparatively close to or far from the 1st cell can show SBR,while the cells located in the middle position can display stochastic multi-resonance(SMR).Fur-thermore,the number of cells that can show SMR increases with coupling strength enhancing.These results indicate that the cells system may make an effective choice in response to external signaling induced by noise,through the mechanism of SMR by adjusting coupling strength.展开更多
文摘针对某MT(Manual Transmission,简称MT)车型加速换挡杆振动问题,基于客观测试,首先按照振动源→振动传递路径→响应端表现的分析方法,对整个振动传递路径展开研究。然后考虑该MT车型换挡杆振动的传递路径,运用HyperMesh、Nastran等软件对振动源(变速器换挡机构)、响应端(换挡杆)进行NVH分析,确认其中变速器换挡机构为振动源,换挡杆为响应端,最后对振动传递路径(换挡拉索)进行隔振试验验证。研究发现,换挡杆振动受到变速器换挡机构弹性体模态大小、换挡拉索隔振优劣的影响显著,研究所提出的振动源、振动传递路径的优化策略为相关项目的NVH(Noise,Vibration and Harshness)性能开发奠定了基础。
基金the Research Fund of Anhui Normal University(Grant No.2006xzx09)the Educational Commission of Anhui Province of China(Grant No.KJ2007A079)the Program for Innovative Research Team in Anhui Normal University
文摘By investigating a stochastic model for intracellular calcium oscillations proposed by Hfer,we have analyzed the transmission behavior of calcium signaling in a one-dimensional two-way coupled hepatocytes system.It is shown that when the first cell is subjected to the external noise,the output signal-to-noise ratio(SNR) in the cell exhibits two maxima as a function of external noise intensity,indicating the occurrence of stochastic bi-resonance(SBR).It is more important that when cells are coupled together,the resonant behavior in the 1st cell propagates along the chain with different features through the coupling effect.The cells whose locations are comparatively close to or far from the 1st cell can show SBR,while the cells located in the middle position can display stochastic multi-resonance(SMR).Fur-thermore,the number of cells that can show SMR increases with coupling strength enhancing.These results indicate that the cells system may make an effective choice in response to external signaling induced by noise,through the mechanism of SMR by adjusting coupling strength.
