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
According to the theoretical analysis and calculation on the base ofcontinuous mass system, the simulation experimental investigation on active control of torsionalvibration in a turbogenerator shaft system is conduct...According to the theoretical analysis and calculation on the base ofcontinuous mass system, the simulation experimental investigation on active control of torsionalvibration in a turbogenerator shaft system is conducted. A test installation with the excitation ofgenerator motor and multi-stepped shaft system is established to simulate the torsional vibration ofa turbogenerator rotor shaft system, and to examine the active control strategy presented. Someuseful results are reached in the experimental study.展开更多
The optimal control to a partially controlled turbogenerator shaft torsionalvibration system is investigated. The principle of input feedforward control is presented to achievethe minimum of the average vibration ener...The optimal control to a partially controlled turbogenerator shaft torsionalvibration system is investigated. The principle of input feedforward control is presented to achievethe minimum of the average vibration energy in a system, and the optimal control matrix of thesystem is derived. A turbogenerator shaft system is taken as an example to simulate the optimalcontrol process of the torsional vibration. Results from this simulation indicate that the vibrationcan be effectively controlled by a partial control strategy.展开更多
The combined deformation and mechanical properties of filament-wound cylinder of filament reinforced composite materials are investigated. A method of using filament-winding composites to reduce the amplitude of torsi...The combined deformation and mechanical properties of filament-wound cylinder of filament reinforced composite materials are investigated. A method of using filament-winding composites to reduce the amplitude of torsion vibration in the case of special stimulated vibration is established. A design formula of anisotropic filament-wound cylinder to reduce the torsion vibration of axle components is obtained. The results indicate that by putting the filament-wound cylinder on an axis, the torsion vibration of the axis can be reduced effectively.展开更多
In this paper, we derive a new description form of coupled bending and torsionalvibrating system with boundary control and observation through Green's formula and provethat it is equivalent to the original form. O...In this paper, we derive a new description form of coupled bending and torsionalvibrating system with boundary control and observation through Green's formula and provethat it is equivalent to the original form. On the basis of this. we prove the control system iswell-posed in time and frequency domain and completely controllable and observable.展开更多
混合动力汽车(hybrid electric vehicle,HEV)发动机启停过程伴随的转矩脉动,易诱发车辆传动系扭振,导致车辆动力不平顺。为解决上述问题,提出并验证基于电磁阻尼自适应模糊控制的传动系扭振主动控制方法。建立行星混联式混合动力汽车发...混合动力汽车(hybrid electric vehicle,HEV)发动机启停过程伴随的转矩脉动,易诱发车辆传动系扭振,导致车辆动力不平顺。为解决上述问题,提出并验证基于电磁阻尼自适应模糊控制的传动系扭振主动控制方法。建立行星混联式混合动力汽车发动机启停工况动力学仿真模型和发动机启停控制逻辑,提出发动机启停扭振自适应模糊控制策略,开展2种运行状态下发动机启停工况仿真,对比分析无控制和自适应模糊控制下传动系扭转振动响应曲线。结果表明,自适应模糊控制相比无控制状态:定置停车时发动机启动和停机工况扭振平均衰减率分别为23.8%和30.1%,车辆行进间发动机启动和停机工况扭振平均衰减率分别为12.1%和23.6%。该方法可有效衰减发动机启停工况传动系扭转振动,提升混合动力汽车发动机启停工况NVH(noise,vibration,and harshness)性能。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.
基金This project is supported by National Natural Science Foundation of China (No.59575015) Education Ministry of China.
文摘According to the theoretical analysis and calculation on the base ofcontinuous mass system, the simulation experimental investigation on active control of torsionalvibration in a turbogenerator shaft system is conducted. A test installation with the excitation ofgenerator motor and multi-stepped shaft system is established to simulate the torsional vibration ofa turbogenerator rotor shaft system, and to examine the active control strategy presented. Someuseful results are reached in the experimental study.
基金the Foundation of the Excellent Young Teacher of National Education Ministry of China (No. D196001).
文摘The optimal control to a partially controlled turbogenerator shaft torsionalvibration system is investigated. The principle of input feedforward control is presented to achievethe minimum of the average vibration energy in a system, and the optimal control matrix of thesystem is derived. A turbogenerator shaft system is taken as an example to simulate the optimalcontrol process of the torsional vibration. Results from this simulation indicate that the vibrationcan be effectively controlled by a partial control strategy.
文摘The combined deformation and mechanical properties of filament-wound cylinder of filament reinforced composite materials are investigated. A method of using filament-winding composites to reduce the amplitude of torsion vibration in the case of special stimulated vibration is established. A design formula of anisotropic filament-wound cylinder to reduce the torsion vibration of axle components is obtained. The results indicate that by putting the filament-wound cylinder on an axis, the torsion vibration of the axis can be reduced effectively.
文摘In this paper, we derive a new description form of coupled bending and torsionalvibrating system with boundary control and observation through Green's formula and provethat it is equivalent to the original form. On the basis of this. we prove the control system iswell-posed in time and frequency domain and completely controllable and observable.
文摘混合动力汽车(hybrid electric vehicle,HEV)发动机启停过程伴随的转矩脉动,易诱发车辆传动系扭振,导致车辆动力不平顺。为解决上述问题,提出并验证基于电磁阻尼自适应模糊控制的传动系扭振主动控制方法。建立行星混联式混合动力汽车发动机启停工况动力学仿真模型和发动机启停控制逻辑,提出发动机启停扭振自适应模糊控制策略,开展2种运行状态下发动机启停工况仿真,对比分析无控制和自适应模糊控制下传动系扭转振动响应曲线。结果表明,自适应模糊控制相比无控制状态:定置停车时发动机启动和停机工况扭振平均衰减率分别为23.8%和30.1%,车辆行进间发动机启动和停机工况扭振平均衰减率分别为12.1%和23.6%。该方法可有效衰减发动机启停工况传动系扭转振动,提升混合动力汽车发动机启停工况NVH(noise,vibration,and harshness)性能。
