针对半主动悬架系统随路面激励变化产生的振动与冲击,设计一种基于BP(Back Propagation)神经网络模糊PID(Proportional Integral Derivative)控制的半主动悬架控制器,以提升悬架系统的控制精度,改善汽车平顺性。以悬架系统的偏差与偏差...针对半主动悬架系统随路面激励变化产生的振动与冲击,设计一种基于BP(Back Propagation)神经网络模糊PID(Proportional Integral Derivative)控制的半主动悬架控制器,以提升悬架系统的控制精度,改善汽车平顺性。以悬架系统的偏差与偏差变化率为输入参数,利用模糊逻辑规则对输入参数进行模糊化和归一化处理,处理结果作为BP神经网络的输入,通过神经网络在线调整加权系数,实现PID控制参数的优化。为了验证控制效果,对比了BP神经网络模糊PID控制半主动悬架系统、模糊PID控制半主动悬架系统和被动悬架系统的性能,BP神经网络模糊PID控制策略的半主动悬架系统具有更好的控制效果,能够显著改善不同路况下车辆悬架的性能。展开更多
An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As...An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As such, an air damper has been designed and developed based on the Maxwell type model concept in the approach of Nishihara and Asami [1]. The cylinder-piston and air-tank type damper characteristics such as air damping ratio and air spring rate have been studied by changing the length and diameter of the capillary pipe between the air cylinder and the air tank, operating air pressure and the air tank volume. A SDOF quarter-car vehicle suspension system using the developed air enclosed cylinder-piston and air-tank type damper has been analyzed for its motion transmissibility characteristics. Optimal values of the air damping ratio at various values of air spring rate have been determined for minimum motion transmissibility of the sprung mass. An experimental setup has been developed for SDOF quarter-car suspension system model using the developed air enclosed cylinder-piston and air-tank type damper to determine the motion transmissibility characteristics of the sprung mass. An attendant air pressure control system has been designed to vary air damping in the developed air damper. The results of the theoretical analysis have been compared with the experimental analysis.展开更多
文摘针对半主动悬架系统随路面激励变化产生的振动与冲击,设计一种基于BP(Back Propagation)神经网络模糊PID(Proportional Integral Derivative)控制的半主动悬架控制器,以提升悬架系统的控制精度,改善汽车平顺性。以悬架系统的偏差与偏差变化率为输入参数,利用模糊逻辑规则对输入参数进行模糊化和归一化处理,处理结果作为BP神经网络的输入,通过神经网络在线调整加权系数,实现PID控制参数的优化。为了验证控制效果,对比了BP神经网络模糊PID控制半主动悬架系统、模糊PID控制半主动悬架系统和被动悬架系统的性能,BP神经网络模糊PID控制策略的半主动悬架系统具有更好的控制效果,能够显著改善不同路况下车辆悬架的性能。
文摘An air damper possesses the advantages that there are no long term changes in the damping properties, there is no dependence on working temperature and additionally, it has less manufacturing and maintenance costs. As such, an air damper has been designed and developed based on the Maxwell type model concept in the approach of Nishihara and Asami [1]. The cylinder-piston and air-tank type damper characteristics such as air damping ratio and air spring rate have been studied by changing the length and diameter of the capillary pipe between the air cylinder and the air tank, operating air pressure and the air tank volume. A SDOF quarter-car vehicle suspension system using the developed air enclosed cylinder-piston and air-tank type damper has been analyzed for its motion transmissibility characteristics. Optimal values of the air damping ratio at various values of air spring rate have been determined for minimum motion transmissibility of the sprung mass. An experimental setup has been developed for SDOF quarter-car suspension system model using the developed air enclosed cylinder-piston and air-tank type damper to determine the motion transmissibility characteristics of the sprung mass. An attendant air pressure control system has been designed to vary air damping in the developed air damper. The results of the theoretical analysis have been compared with the experimental analysis.
