6篇
您的检索式：作者名="Derek SEWARD"
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| 1 | Modelling of an hydraulic excavator using simplifiedrefined instrumental variable(SRIV)algorithm显示文摘Instead of establishing mathematical hydraulic system models from physical laws usually done with the problems of complex modelling processes,low reliability and practicality caused by large uncertainties,a novel modelling method for a highly nonlinear system of a hydraulic excavator is presented.Based on the data collected in the excavator’s arms driving experiments,a data-based excavator dynamic model using Simplified Refined Instrumental Variable(SRIV) identification and estimation algorithms is established.The validity of the proposed data-based model is indirectly demon- strated by the performance of computer simulation and the real machine motion control experiments. | Jun GU James TAYLOR Derek SEWARD | 2007 | 控制理论与应用(英文版)2007，5，4： | 6 |
| 2 | Digital Servo Control of a Robotic Excavator显示文摘An electro-hydraulic control system is designed and implemented for a robotic excavator known as the Lancaster University Computerised and Intelligent Excavator (LUCIE). The excavator is being developed to autonomously dig trenches without human intervention. Since the behavior of the excavator arm is dominated by the nonlinear dynamics of the hydraulic actuators and by the large and unpredictable external disturbances when digging, it is difficult to provide adequate accurate, quick and smooth movement under traditional control methodology, e.g., PI/PID, which is comparable with that of an average human operator. The data-based dynamic models are developed utilizing the simplified refined instrumental variable (SRIV) identification algorithm to precisely describe the nonlinear dynamical behaviour of the electro-hydraulic actuation system. Based on data-based model and proportional-integral-plus (PIP) methodology, which is a non-minimal state space method of control system design based on the true digital control (TDC) system design philosophy, a novel control system is introduced to drive the excavator arm accurately, quickly and smoothly along the desired path. The performance of simulation and field tests which drive the bucket along straight lines both demonstrate the feasibility and validity of the proposed control scheme. | GU Jun SEWARD Derek | 2009 | Chinese Journal of Mechanical Engineering2009，22，2： | 4 |
| 3 | Proportional-integral-plus control of an intelligent excavator 显示文摘 | fun Gu James Taylor Derek Seward | 2004 | Construction-Aided Civil and Infrastructure Engineering2004，，19： | 1 |
| 4 | The Development, Control and Operation of an Autonomous Robotic Excavator显示文摘 | David A. Bradley Derek W. Seward | 1998 | Journal of Intelligent and Robotic Systems1998，，1： | 1 |
| 5 | Proportional-integralplus control of an intelligent excavator显示文摘 | Jun Gu James Taylor Derek Seward | 2004 | Computer-aided civil and infrastructure engineering2004，19，： | 1 |
| 6 | The Development, Control and Operation of an Autonomous Robotic Excavator显示文摘 | David A. Bradley Derek W. Seward | 1998 | Journal of Intelligent and Robotic Systems1998，，1： | 1 |
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