A discrete model reference adaptive controller of robot arm is obtained by integrating the reduced dynamic model of robot, model reference adaptive control （MRAC） and digital signal processing （DSP） computer syste...A discrete model reference adaptive controller of robot arm is obtained by integrating the reduced dynamic model of robot, model reference adaptive control （MRAC） and digital signal processing （DSP） computer system into an electromechanical system. With the DSP computer system, the control signal of each joint of the robot arm can be processed in real time and independently. The simulation and experiment results show that with the control strategy, the robot achieved a good trajectory following precision, a good decoupling performance and a high real-time adaptivity.展开更多
The adaptive feedback control of stability with circumferential inlet distortion has been experimentally investigated in a low-speed,axial compressor.The flat-baffles with different span heights are used to simulate d...The adaptive feedback control of stability with circumferential inlet distortion has been experimentally investigated in a low-speed,axial compressor.The flat-baffles with different span heights are used to simulate different distorted inflow cases.Compared with auto-correlation and root-mean-square analysis,cross-correlation analysis used to predict early stall warning does not depend on the distortion position.Hence,the cross-correlation coefficient was used to monitor the stable status of the compressor and provide the feedback signal in the active control strategy when suffering from different distortions.Based on the stall margin improvement of tip air injection obtained under different distorted inflow cases and the sensitivity analysis of cross-correlation coefficients to injected momentum ratios,tip air injection was adopted as the actuator for adaptive feedback control.The digital signal processing controller was designed and applied to achieve adaptive feedback control in distorted inflow conditions.The results show that the adaptive feedback control of air injection nearly achieves the same stall margin improvement as steady air injection under different distortion intensities with a reduced injection mass flow.Thus,the proposed adaptive feedback control method is ideal for the engine operation with circumferential distorted inflow,which frequently occurs in flight.展开更多
An intelligent vehicle control system is designed and embedded in a Digital Signal Processing(DSP)platform(eZdspTM F2812).A golf cart is used as an installation platform for the overall system,including steering wheel...An intelligent vehicle control system is designed and embedded in a Digital Signal Processing(DSP)platform(eZdspTM F2812).A golf cart is used as an installation platform for the overall system,including steering wheel Alternating Current(AC)serve motor,brake actuator,throttle driving circuit and sensors.Digital image processing technology is also used to enable the autonomous driving system to achieve multi-mode lane-keeping,lane-change and obstacle-avoidance.The overall system is tested and evaluated on a university campus.展开更多
The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Fur...The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Furthermore, the buffer control method and the adaptive control strategy for quantization are proposed, which are adaptive and robust. This system can be operated under the transmission rate ranging from 128kb/s to 2Mb/s. With these strategies for the videoconference system, the high quality image is obtained. The time delay of the system is about half a second.展开更多
为解决传统调幅发射机在效率与线性度方面的技术瓶颈,设计一种基于数字信号处理的脉冲密度调制(Pulse Density Modulation,PDM)调幅发射机驱动控制系统。系统包括信号处理、调制与编码、功率驱动、控制与校准及保护与监测5个功能层,采...为解决传统调幅发射机在效率与线性度方面的技术瓶颈,设计一种基于数字信号处理的脉冲密度调制(Pulse Density Modulation,PDM)调幅发射机驱动控制系统。系统包括信号处理、调制与编码、功率驱动、控制与校准及保护与监测5个功能层,采用二阶Σ-Δ调制与噪声整形生成PDM码流,经全桥功率放大与优化的电感-电容(Inductance Capacitance,LC)滤波器驱动射频末级。引入双反馈闭环控制、时序对齐与预失真补偿提升包络精度,并在保护与监测层设置多种快速响应机制。验证结果表明,该系统能够在不同工况下保持高效、稳定的运行状态,具备较高的工程适配性与推广价值。展开更多
文摘A discrete model reference adaptive controller of robot arm is obtained by integrating the reduced dynamic model of robot, model reference adaptive control （MRAC） and digital signal processing （DSP） computer system into an electromechanical system. With the DSP computer system, the control signal of each joint of the robot arm can be processed in real time and independently. The simulation and experiment results show that with the control strategy, the robot achieved a good trajectory following precision, a good decoupling performance and a high real-time adaptivity.
基金co-supported by the National Natural Science Foundation of China(No.51922098)the National Science and Technology Major Project of China(No.2017-Ⅱ-0004-0017)the Special Fund for the Member of Youth Innovation Promotion Association of CAS(No.2018173).
文摘The adaptive feedback control of stability with circumferential inlet distortion has been experimentally investigated in a low-speed,axial compressor.The flat-baffles with different span heights are used to simulate different distorted inflow cases.Compared with auto-correlation and root-mean-square analysis,cross-correlation analysis used to predict early stall warning does not depend on the distortion position.Hence,the cross-correlation coefficient was used to monitor the stable status of the compressor and provide the feedback signal in the active control strategy when suffering from different distortions.Based on the stall margin improvement of tip air injection obtained under different distorted inflow cases and the sensitivity analysis of cross-correlation coefficients to injected momentum ratios,tip air injection was adopted as the actuator for adaptive feedback control.The digital signal processing controller was designed and applied to achieve adaptive feedback control in distorted inflow conditions.The results show that the adaptive feedback control of air injection nearly achieves the same stall margin improvement as steady air injection under different distortion intensities with a reduced injection mass flow.Thus,the proposed adaptive feedback control method is ideal for the engine operation with circumferential distorted inflow,which frequently occurs in flight.
文摘An intelligent vehicle control system is designed and embedded in a Digital Signal Processing(DSP)platform(eZdspTM F2812).A golf cart is used as an installation platform for the overall system,including steering wheel Alternating Current(AC)serve motor,brake actuator,throttle driving circuit and sensors.Digital image processing technology is also used to enable the autonomous driving system to achieve multi-mode lane-keeping,lane-change and obstacle-avoidance.The overall system is tested and evaluated on a university campus.
基金the High Technology Research and Development Programme of China
文摘The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Furthermore, the buffer control method and the adaptive control strategy for quantization are proposed, which are adaptive and robust. This system can be operated under the transmission rate ranging from 128kb/s to 2Mb/s. With these strategies for the videoconference system, the high quality image is obtained. The time delay of the system is about half a second.
文摘为解决传统调幅发射机在效率与线性度方面的技术瓶颈,设计一种基于数字信号处理的脉冲密度调制(Pulse Density Modulation,PDM)调幅发射机驱动控制系统。系统包括信号处理、调制与编码、功率驱动、控制与校准及保护与监测5个功能层,采用二阶Σ-Δ调制与噪声整形生成PDM码流,经全桥功率放大与优化的电感-电容(Inductance Capacitance,LC)滤波器驱动射频末级。引入双反馈闭环控制、时序对齐与预失真补偿提升包络精度,并在保护与监测层设置多种快速响应机制。验证结果表明,该系统能够在不同工况下保持高效、稳定的运行状态,具备较高的工程适配性与推广价值。
