检索结果-内蒙古大学图书馆

A method for measuring instantaneous treadmill speed

GAIT & POSTURE 2015年第4期41卷 954-956页

作者： Olson, Nathan M. Klute, Glenn K. Puget Sound Hlth Care Syst Dept Vet Affairs Seattle WA 98108 USA Univ Washington Dept Mech Engn Seattle WA 98105 USA

This paper presents a new method for measuring instantaneous treadmill speed. The method consists of two parts: (1) a motion-capture system and reflective squares placed directly on the treadmill belt, and (2) an algorithm for estimating belt speed and distance traveled from the measured positions of the reflective squares. The method was tested with a single subject walking on an instrumented treadmill. The method is easy to set up and results in an accurate estimate of treadmill speed that is conveniently synchronized with the output of the motion-capture system. Published by Elsevier B.V.

关键词： Treadmill instrumentation Walking speed estimation algorithm

来源：评论

学校读者我要写书评

暂无评论

Adaptive Stabilization of Minimum-Phase Plant under Lipschitz Uncertainty via Yakubovich's Method of Recurrent Objective Inequalities

引用

IFAC-PapersOnLine 2015年第11 11期48卷 563-567页

作者： Sokolov, Victor F. Department of Mathematics Komi Science Center Russia

This paper addresses a problem of adaptive stabilization of minimum-phase plant under Lipschitz uncertainty and bounded external disturbance. Solution of the problem is based on the method of recurrent objective inequalities proposed by V.A. Yakubovich in the 1960s. This method allows not only to stabilize unknown plant with the use of a simple projection type estimation algorithm, but to ensure online model validation as well. © 2015

关键词： Stabilization Identification (control systems) Robust control Adaptive Control Adaptive stabilization Bounded disturbances estimation algorithm External disturbances Model validation Projection types uncertainty

来源：评论

学校读者我要写书评

暂无评论

Burst format design for optimum joint estimation of Doppler-shift and Doppler-rate in packet satellite communications

引用

EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2007年第unknown期2007卷 029086-029086页

作者： Giugno, Luca Zanier, Francesca Luise, Marco Wiser Srl Wireless Syst Engn & Res I-57123 Livorno Italy Univ Pisa Dipartimento Ingn Informaz I-56122 Pisa Italy

This paper considers the problem of optimizing the burst format of packet transmission to perform enhanced-accuracy estimation of Doppler-shift and Doppler-rate of the carrier of the received signal, due to relative motion between the transmitter and the receiver. Two novel burst formats that minimize the Doppler-shift and the Doppler-rate Cramer-Rao bounds (CRBs) for the joint estimation of carrier phase/Doppler-shift and of the Doppler-rate are derived, and a data-aided (DA) estimation algorithm suitable for each optimal burst format is presented. Performance of the newly derived estimators is evaluated by analysis and by simulation, showing that such algorithms attain their relevant CRBs with very low complexity, so that they can be directly embedded into new-generation digital modems for satellite communications at low SNR.

关键词： Information System Receive Signal estimation algorithm Relative Motion System Application

来源：评论

学校读者我要写书评

暂无评论

New Constrained Predictive PID controller for packet dropouts in Wireless Networked Control Systems

引用

IFAC-PapersOnLine 2018年第4期51卷 811-816页

作者： Vásquez, Mercedes Chacón Katebi, Reza School of Electrical Engineering University of Costa Rica San José Costa Rica Industrial Control Centre University of Strathclyde Glasgow United Kingdom

A new constrained predictive PID controller is presented to achieve stability and performance robustness in Wireless Networked Control Systems (WNCS), where the communication is subject to dropouts in both communication directions: sensor to control and control to actuator transmission. The control strategy is based on a new PID controller with similar properties to Model-Based Predictive Control (MBPC). A Kalman filter used for output prediction and a consecutive dropouts compensator have also been added to the control scheme. The purpose of this approach is to develop an estimation algorithm and a control system that maintain information of the sensor packets and the control actions. Several experiments using the TrueTime network simulator showed that the predictive PID controller performs as good as the MBPC scheme with the advantage of having a simple structure. © 2018

关键词： Networked control systems Controllers Electric control equipment Model predictive control Packet loss Proportional control systems Robustness (control systems) Three term control systems Wireless sensor networks Control strategies estimation algorithm Model based predictive control Network simulators predictive PID Simple structures Stability and performance robustness Wireless networked control systems

来源：评论

学校读者我要写书评

暂无评论

Effective recursive parallelotopic bounding for robust output-feedback control

引用

IFAC-PapersOnLine 2018年第15期51卷 1032-1037页

作者： Sharma, Udit Thangavel, Sakthi Gottu Mukkula, Anwesh Reddy Paulen, Radoslav Process Dynamics and Operations Group Technische Universität Dortmund Germany Faculty of Chemical and Food Technology Slovak University of Technology in Bratislava Slovakia

In this paper an approach is studied to guaranteed (set-membership) state estimation for robust output-feedback model predictive control (MPC) with hard input and state constraints. Uncertainties are assumed to arise in a dynamic system from unknown initial conditions of state variables and due to unknown-but-bounded measurement noise. The uncertainty in the state variables is represented as a parallelotopic set. The employed state-estimation algorithm recursively outbounds the feasible set that is given by an intersection of model predictions with obtained measurement information. Along with the well-known minimum-volume criterion for parallelotopic outbounding, three alternative criteria are proposed and studied. The aim is to identify the best outbounding approach for improving performance of the robust MPC. © 2018

关键词： Feedback Model predictive control Predictive control systems Robust control State estimation Uncertainty analysis estimation algorithm Improving performance Input and state constraints Measurement information Output feedback Robust output feedbacks State estimation algorithms Unknown but bounded

来源：评论

学校读者我要写书评

暂无评论

A continuous switching contact model for virtual environment based teleoperation

引用

COMPLEX & INTELLIGENT SYSTEMS 2022年第4期8卷 2897-2909页

作者： Fu, Yongqing Wu, Baibo Lin, Weiyang Harbin Inst Technol Res Inst Intelligent Control & Syst Harbin 150001 Peoples R China

Virtual environment (VE), as the proxy of slave contact environment, is the most promising technology to solve the time-delay problems in teleoperation. The accuracy of the predicted force depends not only on the reliability of the contact model but also on the estimation algorithm's adaptability. A new contact model is proposed to be applicable in various materials, which includes both the Kelvin-Voigt model (KVM) and Hunt-Crossley model (HCM). An extra parameter is set in the model to express the capacity of continuous switching between KVM and HCM, whose rationality is proved based on the energy loss. The energy loss is proportional to a power of impact velocity, and the exponent is bounded at [2,3], which exactly lies between KVM and HCM. Furthermore, to estimate the parameters with a single-stage method, the nonlinear model is linearized approximatively with logarithm function and polynomials. Then, the recursive least squares (RLS) algorithm combining forgetting factor and self-perturbing action is designed to identify the four parameters online. Finally, the model's continuous switching is verified with ideal simulation, and the model parameters are continuously changed without jumpy switch error. In the experiment, sponge, foam, and human hand represent the complex contact materials of the slave environment where the predicted force is shown to follow the real contact force with enough accuracy. Therefore, the virtual model can be considered the substitution of slave contact environment so that the feedback force in master can be calculated in real-time.

关键词： VE-based teleoperation Contact model Continuous switching estimation algorithm

来源：评论

学校读者我要写书评

暂无评论

NONINVASIVE FLOW estimation OF A ROTARY VENTRICULAR ASSIST DEVICE

引用

IFAC Proceedings Volumes 2002年第1期35卷 205-210页

作者： Yih-Choung Yu Kirk A. Lehmann John Chiasson Dept. of Electrical & Computer Eng. Lafayette College Easton PA 18042 USA CardiacAssist Inc. Pittsburgh PA 15238 USA Dept. of Electrical & Computer Eng. U. of Tennessee Knoxville TN 37996 USA

An estimator identifying the flow rate through a rotary blood pump was developed. This estimation algorithm uses the pump current and speed signals to estimate the blood flow rate through the pump. The algorithm was derived based on the force balance between the electric torque generated by the motor and the load torque, including the mechanical losses. The corresponding estimator parameters were identified using experimental data in the laboratory. The estimator performed well in mock circulatory loop experiments simulating different physiologic conditions. This algorithm will be implemented in a single board computer to estimate the flow rate of the rotary pump in an implantable left ventricular assist device without invasive sensors.

关键词： biomedical system medical application estimation algorithm

来源：评论

学校读者我要写书评

暂无评论

Motion Vector estimation Method of Dynamic Image Sequence Using Neural Network in the Context of Internet of Things

引用

JOURNAL OF TESTING AND EVALUATION 2024年第3期52卷 1690-1703页

作者： Wang, Benyou Gu, Li Wang, Zhouji West Anhui Univ Sch Elect & Informat Engn Luan 237012 Peoples R China Univ Sci & Technol China Sch Informat Sci & Technol 96 JinZhai Rd Hefei 230026 Peoples R China Univ Sci & Technol China Inst Adv Technol 96 Jinzhai Rd Hefei 230026 Peoples R China

To improve the low resolution of dynamic images caused by motion vector, a neural networkbased motion vector estimation method for dynamic image sequences is proposed in this study. First, a sum of absolute differences (SAD) method is used to determine the search range of motion vector estimation for dynamic image sequences, and a sped up robust features (SURF) algorithm is used to extract the motion vector features from the determined search range. Then, the self -organizing neural network is used to obtain the motion vector estimation results according to the motion vector features of the extracted dynamic images. Finally, a weighted median vector filter is used to correct the pseudo -nonlinear motion vector in the motion vector estimation results to improve the motion vector estimation performance of dynamic image sequences. The experimental results show that the algorithm can compensate for the image according to the motion vector estimation results of dynamic image sequences, and the image quality is obviously improved with high peak signal-to-noise ratio.

关键词： Internet of Things neural network dynamic image sequence motion vector estimation algorithm sum of absolute differences (SAD) difference sped up robust features (SURF) algorithm

来源：评论

学校读者我要写书评

暂无评论

State Dependent Difference Riccati Equation based estimation for Corkscrew Maneuver

引用

IFAC Proceedings Volumes 2014年第3期47卷 2347-2352页

作者： Liat Peled-Eitan Ilan Rusnak RAFAEL P.O.Box 2250 Haifa 3102102 Israel

estimation of corkscrew target maneuver with unknown turning rate is considered. The modeling of the target's equations of motion takes into account the rotation of the velocity and acceleration vectors as the target maneuvers. The inclusion of the more detailed kinematic behavior of the maneuvering target creates nonlinear equations of motion. The state - position, velocity acceleration and jerk, and the angular rate of the velocity vector are estimated. This is done without inclusion of the angular rate into the state vector, but in separate equation. As the equations of motion are nonlinear the State Dependent Differential-Difference Riccati Equation based estimator (SDDRE) is implemented. Two filters are evaluated. The velocity based jerk and acceleration based snap filters are considered. It is demonstrated via simulations that the acceleration based snap filters has improved performance with respect to the velocity based jerk filter.

关键词： estimation algorithm SDRE SDDRE estimation of nonlinear system target tracking

来源：评论

学校读者我要写书评

暂无评论

TWO OBSERVERS FOR IN-CYLINDER MASS estimation USING CYLINDER PRESSURE MEASUREMENTS

引用

IFAC Proceedings Volumes 2007年第10期40卷 219-226页

作者： P. Giansetti G. Colin Y. Chamaillard P. Higelin Laboratoire de Mécanique et d'Energêtique Orlêans France

To meet future pollutant emissions Standards, it is crucial to be able to estimate the cycle by cycle in-cylinder mass and the composition of the combustion chamber charge. This charge consists of residual gas from the previous cycle, fresh air and fuel. Consequently, the estimation of the fresh air mass based on total in-cylinder mass is a function of the residual gas fraction. This estimation is essential to compute the fuel mass to be injected. This paper proposes two observers, based on a physical approach, that estimate the in-cylinder mass and composition using the cylinder pressure. To test the estimator, several parameters are varied, especially the cylinder pressure offset compensation and the exhaust gases temperature.

关键词： cylinder pressure estimation algorithm in-cylinder mass estimation residual gases SI engine control

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：