针对特种车载总线网络可靠性难以评估的问题,提出采用随机高级Petri网(Stochastic High-level Petri Net,SHLPN)分析特种车载总线网络可靠性。深入分析特种车载总线网络故障模式的基础上,将其等效为冗余总线控制器模块、远程终端模块和...针对特种车载总线网络可靠性难以评估的问题,提出采用随机高级Petri网(Stochastic High-level Petri Net,SHLPN)分析特种车载总线网络可靠性。深入分析特种车载总线网络故障模式的基础上,将其等效为冗余总线控制器模块、远程终端模块和冗余链路模块的串联,分别建立各个模块的SHLPN模型,得到了各个模块的稳态可用度计算式,进而综合得到特种车载总线网络的稳态可用度计算式。最后,实例分析验证了所提方法的有效性。展开更多
To analyze the dynamic response and reliability of a continuous beam bridge under the action of an extra heavy vehicle, a vehicle–bridge coupled vibration model was established based on the virtual work principle and...To analyze the dynamic response and reliability of a continuous beam bridge under the action of an extra heavy vehicle, a vehicle–bridge coupled vibration model was established based on the virtual work principle and vehicle–bridge displacement compatibility equation, which can accurately simulate the dynamic characteristics of the vehicle and bridge. Results show that deck roughness has an important function in the effect of the vehicle on the bridge. When an extra heavy vehicle passes through the continuous beam bridge at a low speed of 5 km/h, the impact coefficient reaches a high value, which should not be disregarded in bridge safety assessments. Considering that no specific law exists between the impact coefficient and vehicle speed, vehicle speed should not be unduly limited and deck roughness repairing should be paid considerable attention. Deck roughness has a significant influence on the reliability index, which decreases as deck roughness increases. For the continuous beam bridge in this work, the reliability index of each control section is greater than the minimum reliability index. No reinforcement measures are required for over-sized transport.展开更多
文摘针对特种车载总线网络可靠性难以评估的问题,提出采用随机高级Petri网(Stochastic High-level Petri Net,SHLPN)分析特种车载总线网络可靠性。深入分析特种车载总线网络故障模式的基础上,将其等效为冗余总线控制器模块、远程终端模块和冗余链路模块的串联,分别建立各个模块的SHLPN模型,得到了各个模块的稳态可用度计算式,进而综合得到特种车载总线网络的稳态可用度计算式。最后,实例分析验证了所提方法的有效性。
基金Project(50779032)supported by the National Natural Science Foundation of ChinaProject(20090451330)supported by the Postdoctoral Foundation of ChinaProject(BS2013SF007)supported by Shandong Scientific Research Award Foundation for Outstanding Young Scientists,China
文摘To analyze the dynamic response and reliability of a continuous beam bridge under the action of an extra heavy vehicle, a vehicle–bridge coupled vibration model was established based on the virtual work principle and vehicle–bridge displacement compatibility equation, which can accurately simulate the dynamic characteristics of the vehicle and bridge. Results show that deck roughness has an important function in the effect of the vehicle on the bridge. When an extra heavy vehicle passes through the continuous beam bridge at a low speed of 5 km/h, the impact coefficient reaches a high value, which should not be disregarded in bridge safety assessments. Considering that no specific law exists between the impact coefficient and vehicle speed, vehicle speed should not be unduly limited and deck roughness repairing should be paid considerable attention. Deck roughness has a significant influence on the reliability index, which decreases as deck roughness increases. For the continuous beam bridge in this work, the reliability index of each control section is greater than the minimum reliability index. No reinforcement measures are required for over-sized transport.
