Motion control can be considered as the synergistic collaboration of mechanical and electrical engineering, computer science and information technology to apply a controlled force to achieve useful motion in fluid or ...Motion control can be considered as the synergistic collaboration of mechanical and electrical engineering, computer science and information technology to apply a controlled force to achieve useful motion in fluid or soiled electromechanical systems. With the development of computer, electronics, and automatic control theory, motion control comes to a new stage. Great applications are based on the characteristics, stemming from advantages of electronics and modern control technology achievements, having a very good load matching property. Currently, microprocessor-based controllers are invariably used in most applications of drive electronics. The object of this work is to design a position control mechanism system, which can be used in test section of low speed wind tunnel. System load specifications and performance requirements are given. A comprehensive study of mathematical modeling of the mechanism components is given. Procedure for selection of various components with optimum parameters is discussed. After selection and calculation of system parameters to meet the performance requirements, a PID control method is adopted.展开更多
The design idea of tracking-differentiator and the nonlinear PID controllerare introduced, the applicable algorithm and its real result for distributed aerodynamicsloading control system are discussed, and the constru...The design idea of tracking-differentiator and the nonlinear PID controllerare introduced, the applicable algorithm and its real result for distributed aerodynamicsloading control system are discussed, and the construction of the test & contro1 system arealso presented. The application shows that the nonlinear PID algorithm has the advan-tages of high reliability, short run time and strong stability.展开更多
In order to realize high accuracy control for periodic motion,a hybrid controller with grey prediction was presented in this paper.Incorporating the grey prediction,repetitive control,and the traditional Proportional-...In order to realize high accuracy control for periodic motion,a hybrid controller with grey prediction was presented in this paper.Incorporating the grey prediction,repetitive control,and the traditional Proportional-Integral-Differential(PID)control,a design method of the grey prediction repetitive PID(GRPID)control algorithm was investigated,according to the characteristics of the periodic motion control.The hybrid control algorithm can estimate unsure parameters and disturbance of system using grey prediction,and compensate control in terms of the prediction results,and this may improve control quality and robustness of repetitive control for controlling periodic motion.An example was carried out to verify the feasibility of the controller.The simulation results show that this algorithm has better performances than that of the conventional repetitive control system.It indicates the presented control method is more suitable for control system of periodic motion.展开更多
Recently,polymer electrolyte fuel cell(PEFC)begins to be used in a lot of fields such as automotive industry and power generation etc.Therefore our laboratory developed the simple maintenance equipment which can diagn...Recently,polymer electrolyte fuel cell(PEFC)begins to be used in a lot of fields such as automotive industry and power generation etc.Therefore our laboratory developed the simple maintenance equipment which can diagnose a performance degradation of PEFC instantaneously by analyzing transient response at a current interruption.However,because it was not able to diagnose some operating conditions,we determined that it was necessary to improve the diagnostic algorithm.Therefore we developed a new algorithm which sequentially approximates diagnostic parameters by the on-line algorithm of the method of least squares.The adequacy of a new algorithm was verified using a PEFC single cell of 25 cm^2 applied about two Membrane Electrode Assemblies(MEAs)((a)10 mg,(b)7.5 mg)with different amount of platinum.As a result,we judged that this algorithm was able to apply to the new diagnostics because it distinguished the difference of two MEAs in each parameter.展开更多
As for the application of electronic fuel injection （EFI） system to small gasoline generator set, mechanical speed controller cannot be coupled with EFI system and has the shortcomings of lagged regulation and poor ...As for the application of electronic fuel injection （EFI） system to small gasoline generator set, mechanical speed controller cannot be coupled with EFI system and has the shortcomings of lagged regulation and poor accuracy, a feed-forward control strategy based on load combined with proportional-integral-differential （PID） control strategy was proposed, and a digital speed controller applied to the electrical control system was designed. The detailed control strategy of the controller was intro- duced. The hardware design for the controller and the key circuits of motor driving, current sampling and angular signal captu- ring were given, and software architecture was discussed. Combined with a gasoline generator set mounted with EFI system, the controller parameters were tuned and optimized empirically by hardware in loop and bench test methods. Test results show that the speed deviation of generator set is low and the control system is stable in steady state; In transient state the control system responses quickly, has high stability under mutation loads especially when suddenly apply and remove 100% load, the speed deviation is within 8% of reference speed and the transient time is less than 5 s, satisfying the ISO standard.展开更多
针对智能车因单条引导线信息量少而引起的误识别问题,设计一种能自动识别和跟踪双边引导线的智能车系统。智能车以Freescale公司MC9S12XSl28作为核心控制器,利用COMS(Complementary Metal OxideSemiconductor)摄像头OV7620作为路径信息...针对智能车因单条引导线信息量少而引起的误识别问题,设计一种能自动识别和跟踪双边引导线的智能车系统。智能车以Freescale公司MC9S12XSl28作为核心控制器,利用COMS(Complementary Metal OxideSemiconductor)摄像头OV7620作为路径信息采集装置,对采集图像进行二值化处理、去噪操作和边缘检测后提取路径信息、进而准确地判别跑道的形状,为舵机和电机提供控制依据,以使小车平稳快速地行驶。同时,提出将行驶状态与赛道信息综合考虑的措施,并通过PID(Proportional Integral Differential)控制策略以及实验测试,实现了对各种典型跑道的优化处理,使高速行进中的智能车具有良好的转向调节能力和加减速响应能力。智能车可以在以白色为底面颜色,两边有黑色引导线的跑道上运行,克服了因单条引导线信息量少而引起的误识别问题。展开更多
为满足标准电阻量值传递时苛刻的温度要求,设计了精度高、稳定性强的控温箱。通过四线制温度传感器Pt100实现控温箱内腔温度的采集,模糊比例—积分—微分(PID)控制器通过改变脉宽调制输出的占空比控制发热电阻的功率,以保持温度稳定。...为满足标准电阻量值传递时苛刻的温度要求,设计了精度高、稳定性强的控温箱。通过四线制温度传感器Pt100实现控温箱内腔温度的采集,模糊比例—积分—微分(PID)控制器通过改变脉宽调制输出的占空比控制发热电阻的功率,以保持温度稳定。通过改变内腔中外加功率电阻的发热量,模拟标准电阻发热,以测试控温箱内部抗干扰能力;通过多点比对法对控温箱内腔温度的均匀性进行评价。经过数据分析,控温箱稳定性优于1 m K,温度不均匀性低于6 m K,当外加功率小于0.31 W时,控温箱能保持稳定。结果表明,控温箱抗干扰性能良好,稳定性及均匀性满足要求,可以为标准电阻量值传递提供稳定的温度环境。展开更多
文摘Motion control can be considered as the synergistic collaboration of mechanical and electrical engineering, computer science and information technology to apply a controlled force to achieve useful motion in fluid or soiled electromechanical systems. With the development of computer, electronics, and automatic control theory, motion control comes to a new stage. Great applications are based on the characteristics, stemming from advantages of electronics and modern control technology achievements, having a very good load matching property. Currently, microprocessor-based controllers are invariably used in most applications of drive electronics. The object of this work is to design a position control mechanism system, which can be used in test section of low speed wind tunnel. System load specifications and performance requirements are given. A comprehensive study of mathematical modeling of the mechanism components is given. Procedure for selection of various components with optimum parameters is discussed. After selection and calculation of system parameters to meet the performance requirements, a PID control method is adopted.
文摘The design idea of tracking-differentiator and the nonlinear PID controllerare introduced, the applicable algorithm and its real result for distributed aerodynamicsloading control system are discussed, and the construction of the test & contro1 system arealso presented. The application shows that the nonlinear PID algorithm has the advan-tages of high reliability, short run time and strong stability.
基金Science Fund of Shanghai Institute of Technology,China(No.YJ200609)
文摘In order to realize high accuracy control for periodic motion,a hybrid controller with grey prediction was presented in this paper.Incorporating the grey prediction,repetitive control,and the traditional Proportional-Integral-Differential(PID)control,a design method of the grey prediction repetitive PID(GRPID)control algorithm was investigated,according to the characteristics of the periodic motion control.The hybrid control algorithm can estimate unsure parameters and disturbance of system using grey prediction,and compensate control in terms of the prediction results,and this may improve control quality and robustness of repetitive control for controlling periodic motion.An example was carried out to verify the feasibility of the controller.The simulation results show that this algorithm has better performances than that of the conventional repetitive control system.It indicates the presented control method is more suitable for control system of periodic motion.
文摘Recently,polymer electrolyte fuel cell(PEFC)begins to be used in a lot of fields such as automotive industry and power generation etc.Therefore our laboratory developed the simple maintenance equipment which can diagnose a performance degradation of PEFC instantaneously by analyzing transient response at a current interruption.However,because it was not able to diagnose some operating conditions,we determined that it was necessary to improve the diagnostic algorithm.Therefore we developed a new algorithm which sequentially approximates diagnostic parameters by the on-line algorithm of the method of least squares.The adequacy of a new algorithm was verified using a PEFC single cell of 25 cm^2 applied about two Membrane Electrode Assemblies(MEAs)((a)10 mg,(b)7.5 mg)with different amount of platinum.As a result,we judged that this algorithm was able to apply to the new diagnostics because it distinguished the difference of two MEAs in each parameter.
文摘As for the application of electronic fuel injection （EFI） system to small gasoline generator set, mechanical speed controller cannot be coupled with EFI system and has the shortcomings of lagged regulation and poor accuracy, a feed-forward control strategy based on load combined with proportional-integral-differential （PID） control strategy was proposed, and a digital speed controller applied to the electrical control system was designed. The detailed control strategy of the controller was intro- duced. The hardware design for the controller and the key circuits of motor driving, current sampling and angular signal captu- ring were given, and software architecture was discussed. Combined with a gasoline generator set mounted with EFI system, the controller parameters were tuned and optimized empirically by hardware in loop and bench test methods. Test results show that the speed deviation of generator set is low and the control system is stable in steady state; In transient state the control system responses quickly, has high stability under mutation loads especially when suddenly apply and remove 100% load, the speed deviation is within 8% of reference speed and the transient time is less than 5 s, satisfying the ISO standard.
文摘针对智能车因单条引导线信息量少而引起的误识别问题,设计一种能自动识别和跟踪双边引导线的智能车系统。智能车以Freescale公司MC9S12XSl28作为核心控制器,利用COMS(Complementary Metal OxideSemiconductor)摄像头OV7620作为路径信息采集装置,对采集图像进行二值化处理、去噪操作和边缘检测后提取路径信息、进而准确地判别跑道的形状,为舵机和电机提供控制依据,以使小车平稳快速地行驶。同时,提出将行驶状态与赛道信息综合考虑的措施,并通过PID(Proportional Integral Differential)控制策略以及实验测试,实现了对各种典型跑道的优化处理,使高速行进中的智能车具有良好的转向调节能力和加减速响应能力。智能车可以在以白色为底面颜色,两边有黑色引导线的跑道上运行,克服了因单条引导线信息量少而引起的误识别问题。
文摘为满足标准电阻量值传递时苛刻的温度要求,设计了精度高、稳定性强的控温箱。通过四线制温度传感器Pt100实现控温箱内腔温度的采集,模糊比例—积分—微分(PID)控制器通过改变脉宽调制输出的占空比控制发热电阻的功率,以保持温度稳定。通过改变内腔中外加功率电阻的发热量,模拟标准电阻发热,以测试控温箱内部抗干扰能力;通过多点比对法对控温箱内腔温度的均匀性进行评价。经过数据分析,控温箱稳定性优于1 m K,温度不均匀性低于6 m K,当外加功率小于0.31 W时,控温箱能保持稳定。结果表明,控温箱抗干扰性能良好,稳定性及均匀性满足要求,可以为标准电阻量值传递提供稳定的温度环境。
