Due to the coaxial connection of engine, motor and pump, the dynamic characteristics of hybrid construction machinery are changed, which generates a new torsional vibration problem of multi-power sources. To reduce th...Due to the coaxial connection of engine, motor and pump, the dynamic characteristics of hybrid construction machinery are changed, which generates a new torsional vibration problem of multi-power sources. To reduce the torsional vibration of the hybrid construction machinery complex shafting, torsional vibration active control was proposed. The three-mass model of coaxial shafting of hybrid construction machinery was established. The PID control and the fuzzy sliding mode control were chosen to weaken torsional vibration by controlling the motor speed and torque. The simulation results show that the fuzzy sliding mode control has 12% overshoot of the PID control when the engine torque changes. The active control is effective and can realize smooth power switch.展开更多
以电磁作动器式主动液阻悬置为研究对象,建立机-电-磁-液多物理场耦合的力学及数学模型,并推导次级通道传递特性,旨在分析和评估其在抑制车辆振动方面的性能。采用基于电压控制形式的次级通道传递特性的窄带复数滤波最小均方N-C-FxLMS(n...以电磁作动器式主动液阻悬置为研究对象,建立机-电-磁-液多物理场耦合的力学及数学模型,并推导次级通道传递特性,旨在分析和评估其在抑制车辆振动方面的性能。采用基于电压控制形式的次级通道传递特性的窄带复数滤波最小均方N-C-FxLMS(narrowband complex filtered-x least mean square)算法对系统进行仿真,并且基于dSPACE半实物仿真平台和inova振动试验台进行试验验证。仿真结果表明,在25~200 Hz的频段内,所提出的控制策略能够显著改善系统的减振性能。试验结果表明,主动控制能将传递至车身端的振动减小17 dB~27 dB,验证了模型的准确性和控制策略的有效性,为主动悬置系统的设计和优化提供了有价值的理论依据和试验支持。展开更多
The first International Symposium on Dynamics,Monitoring,and Diagnostics was held in Chongqing,China,in April 2022.The Symposium,which was attended both virtually and in person,had an audience of 2000 and was aimed at...The first International Symposium on Dynamics,Monitoring,and Diagnostics was held in Chongqing,China,in April 2022.The Symposium,which was attended both virtually and in person,had an audience of 2000 and was aimed at enhancing the intelligence of condition monitoring for engineering systems.During the Symposium,five keynote addresses were delivered by world leading experts,and this paper is comprised of summaries of these addresses to ensure that the important messages of these speakers are properly on record and readily able to be referenced.展开更多
针对船舶机械振动的低频线谱主动控制,文章采用输出力大、频响平直、无接触式的磁悬浮作动器,分析了永磁偏置式作动器的电-磁-力耦合特性,推导了磁悬浮主被动隔振系统运动方程和系统稳定性影响因素;研制了满足船舶应用要求、具有冲击摇...针对船舶机械振动的低频线谱主动控制,文章采用输出力大、频响平直、无接触式的磁悬浮作动器,分析了永磁偏置式作动器的电-磁-力耦合特性,推导了磁悬浮主被动隔振系统运动方程和系统稳定性影响因素;研制了满足船舶应用要求、具有冲击摇摆适应能力的磁悬浮-气囊主被动混合隔振器。采用收敛快速的窄带多通道Fx-Newton算法,并针对线谱频率波动时的控制鲁棒性,提出了窄带滤波相位差的自适应补偿环节。在船用200 k W柴发机组上进行了主被动混合隔振实验,未开启线谱控制时,可获得>32.8 d B的宽频隔振效果;控制开启后,可进一步有效衰减传递到基座的多根线谱振动,并且在柴发机组的转速波动工况下依然能实现快速收敛、稳定和高效控制。该主被动混合隔振系统可满足船舶机械低频线谱控制的工程实用要求。展开更多
基金Project(51205415)supported by the National Natural Science Foundation of ChinaProject(14JJ3020)supported by the Natural Science Foundation of Hunan Province,China+2 种基金Project(2013M542129)supported by China Postdoctoral Science FoundationProject(2012QNZT014)supported by the Fundamental Research Funds for the Central Universities,ChinaProject supported by the Postdoctoral Foundation of Central South University,China
文摘Due to the coaxial connection of engine, motor and pump, the dynamic characteristics of hybrid construction machinery are changed, which generates a new torsional vibration problem of multi-power sources. To reduce the torsional vibration of the hybrid construction machinery complex shafting, torsional vibration active control was proposed. The three-mass model of coaxial shafting of hybrid construction machinery was established. The PID control and the fuzzy sliding mode control were chosen to weaken torsional vibration by controlling the motor speed and torque. The simulation results show that the fuzzy sliding mode control has 12% overshoot of the PID control when the engine torque changes. The active control is effective and can realize smooth power switch.
文摘以电磁作动器式主动液阻悬置为研究对象,建立机-电-磁-液多物理场耦合的力学及数学模型,并推导次级通道传递特性,旨在分析和评估其在抑制车辆振动方面的性能。采用基于电压控制形式的次级通道传递特性的窄带复数滤波最小均方N-C-FxLMS(narrowband complex filtered-x least mean square)算法对系统进行仿真,并且基于dSPACE半实物仿真平台和inova振动试验台进行试验验证。仿真结果表明,在25~200 Hz的频段内,所提出的控制策略能够显著改善系统的减振性能。试验结果表明,主动控制能将传递至车身端的振动减小17 dB~27 dB,验证了模型的准确性和控制策略的有效性,为主动悬置系统的设计和优化提供了有价值的理论依据和试验支持。
基金supported in part by the Australian Government through the Australian Research Council Discovery Project DP160103501.
文摘The first International Symposium on Dynamics,Monitoring,and Diagnostics was held in Chongqing,China,in April 2022.The Symposium,which was attended both virtually and in person,had an audience of 2000 and was aimed at enhancing the intelligence of condition monitoring for engineering systems.During the Symposium,five keynote addresses were delivered by world leading experts,and this paper is comprised of summaries of these addresses to ensure that the important messages of these speakers are properly on record and readily able to be referenced.
文摘针对船舶机械振动的低频线谱主动控制,文章采用输出力大、频响平直、无接触式的磁悬浮作动器,分析了永磁偏置式作动器的电-磁-力耦合特性,推导了磁悬浮主被动隔振系统运动方程和系统稳定性影响因素;研制了满足船舶应用要求、具有冲击摇摆适应能力的磁悬浮-气囊主被动混合隔振器。采用收敛快速的窄带多通道Fx-Newton算法,并针对线谱频率波动时的控制鲁棒性,提出了窄带滤波相位差的自适应补偿环节。在船用200 k W柴发机组上进行了主被动混合隔振实验,未开启线谱控制时,可获得>32.8 d B的宽频隔振效果;控制开启后,可进一步有效衰减传递到基座的多根线谱振动,并且在柴发机组的转速波动工况下依然能实现快速收敛、稳定和高效控制。该主被动混合隔振系统可满足船舶机械低频线谱控制的工程实用要求。
