检索结果-内蒙古大学图书馆

Dynamic sprite-based real-time particle graphics

OPTICAL ENGINEERING 2004年第5期43卷 1231-1237页

作者： Sills, TG Williams, OM Def Sci & Technol Org Weapons Syst Div Edinburgh SA 5111 Australia

A challenging aspect of real-time infrared scene generation for the hardware-in-the-loop testing of infrared-guided weapon systems is the rendering of particle systems to represent gaseous and particulate volumes. In this work, a simulation tool is described for enabling the generation of real-time particle effects with high spatial and temporal fidelity by using many less primitives than traditional means. The tool can be applied for representing plumes and countermeasures, and enables the simulation of several key capabilities, including internal flow, turbulence, persistence, and structure, all capable of being varied dynamically as a function of power setting at the source. The principles of operation, software implementation, and general performance are discussed. (C) 2004 Society of Photo-Optical Instrumentation Engineers.

关键词： hardware-in-the-loop testing real-time infrared scene generation particle graphics quadstrips sprites

来源：评论

学校读者我要写书评

暂无评论

Development and experimental validation of real-time executable models of primary fly-by-wire actuators

引用

PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART I-JOURNAL OF SYSTEMS AND CONTROL ENGINEERING 2008年第I6期222卷 523-542页

作者： Di Rito, G. Denti, E. Galatolo, R. Univ Pisa Dept Aerosp Engn Pisa Italy

The availability of practical real-time models of primary flight actuators is a key aspect for performing hardware-in-the-loop simulations of fly-by-wire flight control systems. The solution could be offered by empirical models tuned on experimental data, but this approach would imply that hardware-in-the-loop simulations could be performed only after the actuators have been designed, constructed, and tested. The alternative approach, to which this work refers, is to develop high-fidelity actuator models based on the component physics and to reduce their complexity by trying to obtain a compromise between accuracy of results and real-time execution requirements. In the paper, real-time models of a servo-hydraulic actuator for primary flight controls are developed, taking into account the basic features of the fly-by-wire implementation (the non-linear direct-drive servovalve dynamics, the structural compliance, the oil compressibility, the saturation of commands, and the digital controls) as well as other physical phenomena, which are often disregarded in hydraulic actuator modelling (the hinge play, the flow forces on the servovalve spool, and the laminar servovalve flow). The simulation results of models characterized by different levels of complexity are compared with experimental data obtained by testing the aileron actuator of a modern fly-by-wire aircraft, and the relative importance of the model characteristics is highlighted and discussed, providing useful guidelines about actuator model reduction for real-time applications.

关键词： flight control systems hydraulic actuators modelling real-time simulation hardware-in-the-loop testing

来源：评论

学校读者我要写书评

暂无评论

Study of an energy dissipative under-ride guard for enhancement of crashworthiness in a car-truck collision

引用

INTERNATIONAL JOURNAL OF VEHICLE DESIGN 1999年第1-2期22卷 29-53页

作者： Rakheja, S Balike, M Hoa, SV Concordia Univ Dept Mech Engn CONCAVE Res Ctr Montreal PQ H3G 1M8 Canada Concordia Univ Dept Mech Engn Ctr Composite Mat Montreal PQ H3G 1M8 Canada

The performance potentials of a concept of an energy dissipating under-ride guard are investigated under direct and oblique impacts to enhance the crashworthiness of automobiles involved in collisions with heavy freight vehicles. The under-ride guard is analytically modelled incorporating non-linearities due to asymmetric damping, stiffness, clearance spring and kinematics of linkages, using the principle of conservation of momentum and Lagrangian dynamics. hardware-in-the-loop tests are performed to evaluate the impact energy dissipated by the damper and to verify the proposed model. The analysis is performed for different angles of impact and coefficients of friction between the automobile bumper and the under-ride guard. The performance benefits of the proposed guard at different impact angles are investigated using performance criteria based upon the magnitude of intrusion of the car mass, peak car mass acceleration, and dissipated energy. A multi-variable design optimization is performed to minimize the magnitude of intrusion and peak acceleration, and maximize the energy dissipated by the damper. The results of the study show that the severity of a crash involving an automobile and a heavy vehicle can be significantly reduced by the proposed guard by: (1) limiting the magnitude of intrusion;and (2) dissipating the part of the crash energy through the damper.

关键词： under-ride guards car-truck collisions energy dissipation hardware-in-the-loop testing modelling impact analysis oblique impact dampers

来源：评论

学校读者我要写书评

暂无评论

Analysis and validation of a real-time AC drive simulator

引用

IEEE TRANSACTIONS ON POWER ELECTRONICS 2004年第2期19卷 336-345页

作者： Champagne, R Dessaint, LA Fortin-Blanchette, H Sybille, G Ecole Technol Superieure Dept Elect Engn Montreal PQ H3C 1K3 Canada Inst Rech Hydro Quebec Power Syst Testing & Network Simulat Lab Varennes PQ J3X 1S1 Canada

This paper presents the analysis and validation of a real-time ac drive simulator. Real-time simulation has been used for over a decade in power systems engineering to test controllers thoroughly, efficiently, and safely. The development and testing of large ac drives could benefit from this type of simulation, but real-time power system. simulators have modeling restrictions preventing stable and accurate simulation of isolated drives switching at high frequencies. These restrictions can be overcome by combining in a single model both the power converter and motor models. After discussing the salient issues related to the real-time simulation of ac drives, a prototype real-time simulator for drives is described. Its ability to accurately emulate the behavior of large drives is demonstrated through two case studies. A first case study demonstrates the feasibility of simulating a drive of typical complexity in real-time. The second case study demonstrates how the controller for a PWM VSI fed induction motor, switching at 4 kHz, is designed, implemented in a microcontroller and tested in real-time using a simulated inverter, motor and load. Comparisons against results obtained with another simulation tool, which uses extremely accurate variable-step integration algorithms, demonstrates the validity of our approach.

关键词： AC motor drives hardware-in-the-loop testing real time simulation state space methods

来源：评论

学校读者我要写书评

暂无评论

Real-Time hardware-in-the-loop Tests of Star Tracker Algorithms

引用

INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING 2013年第1期2013卷 14.1-14.13页

作者： Rufino, Giancarlo Accardo, Domenico Grassi, Michele Fasano, Giancarmine Renga, Alfredo Tancredi, Urbano Univ Naples Federico II Dept Ind Engn I-80125 Naples Italy Univ Naples Parthenope Ctr Direz Dept Technol I-80143 Naples Italy

This paper deals with star tracker algorithms validation based on star field scene simulation and hardware-in-the-loop test configuration. A laboratory facility for indoor tests, based on the simulation of star field scenes, is presented. Attainable performance is analyzed theoretically for both static and dynamic simulations. Also, a test campaign is presented, in which a star sensor prototype with real-time, fully autonomous capability is exploited. Results that assess star field scene simulation performance and show the achievable validation for the sensor algorithms and performance in different operating modes (autonomous attitude acquisition, attitude tracking, and angular rate-only) and different aspects (coverage, reliability, and measurement performance) are discussed.

关键词： biomedical facility Performance metrics indoor test simulating algorithms Of STARS hardware-in-the-loop testing Computer hardware stars FIELD STARS

来源：评论

学校读者我要写书评

暂无评论

Design and hardware-in-the-loop Integration of a UAV Microavionics System in a Manned-Unmanned Joint Airspace Flight Network Simulator

引用

JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS 2009年第1-3期54卷 359-386页

作者： Ates, Serdar Bayezit, Ismail Inalhan, Gokhan Istanbul Tech Univ Fac Aeronaut & Astronaut Controls & Avion Lab TR-80626 Istanbul Turkey

One of the challenges for manned-unmanned air vehicles flying in joint airspace is the need to develop customized but scalable algorithms and hardware that will allow safe and efficient operations. In this work, we present the design of a bus-backboned UAV microavionics system and the hardware-in-the-loop integration of this unit within a joint flight network simulator. The microavionics system is structured around the Controller Area Network and Ethernet bus data backbone. The system is designed to be cross-compatible across our experimental mini-helicopters, aircrafts and ground vehicles, and it is tailored to allow autonomous navigation and control for a variety of different research test cases. The expandable architecture allows not only scalability, but also flexibility to test manned-unmanned fleet cooperative algorithm designs at both hardware and software layer deployed on bus integrated flight management computers. The flight simulator is used for joint simulation of virtual manned and unmanned vehicles within a common airspace. This allows extensive hardware-in-the-loop testing capability of customized devices and algorithms in realistic test cases that require manned and unmanned vehicle coordinated flight trajectory planning.

关键词： Microavionics hardware-in-the-loop testing Flight network simulator

来源：评论

学校读者我要写书评

暂无评论

Development of a tip-tilt air-bearing testbed for physically emulating proximity-flight orbital mechanics

引用

ADVANCES IN SPACE RESEARCH 2023年第10期71卷 4332-4339页

作者： Fernandez, Bautista R. Herrera, Leonardo Hudson, Jennifer Romano, Marcello Naval Postgrad Sch Monterey CA 93943 USA

This paper presents the design and development of a new granite hardware-in-the-loop air-bearing testbed that can emulate the rel-ative dynamics of orbiting spacecraft. The air-bearing testbed's granite slab is supported via a fixed post and two mechanically adjustable screw actuators that allow the table's surface to change in orientation. The surface can actuate in two axes: pitch and roll. As the table tilts, the Earth's gravitational acceleration affects the acceleration experienced by a floating test vehicle operating on its surface without the need to activate the vehicle's on-board thrusters. Thus, the testbed emulates the relative orbital dynamics between two orbiting space-craft, instead of the planar zero-g conditions provided by most granite table facilities. Proof-of-concept experimental results are presented. Published by Elsevier B.V. on behalf of COSPAR.

关键词： Spacecraft relative motion hardware-in-the-loop testing Air bearing testbed

来源：评论

学校读者我要写书评

暂无评论

Sliding mode observers for robust fault estimation in linear parameter varying systems

引用

INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL 2023年第15期33卷 9084-9108页

作者： Chen, Lejun Edwards, Christopher Alwi, Halim Sato, Masayuki Nateghi, Shamila Shtessel, Yuri UCL Dept Elect & Elect Engn London England Univ Exeter Coll Engn Math & Phys Sci Exeter Devon England Japan Aerosp Explorat Agcy Mitaka Tokyo Japan Univ Alabama Huntsville AL 35899 USA

A linear parameter varying sliding mode fault reconstruction scheme is proposed. Compared with other conventional sliding mode observer designs, the estimate emerges quite naturally from the equations governing the sliding motion, and although the process may be viewed as a filtering of the discontinuous injection, there is no phase lag introduced in the process. A semi-analytic solution to the proposed linear parameter varying sliding mode observer is first discussed. This motivates the structure of the linear matrix inequality formulation which is proposed, and clarifies the class of systems to which the approach is applicable. The linear matrix inequality problem set up minimizes the induced Script capital L2$$ {\mathcal{L}}_2 $$ gain between the fault estimate and external disturbances, whilst ensuring linear quadratic performance of the underpinning sliding motion. The proposed scheme has been validated using the Japan Aerospace Exploration Agency's Multi-Purpose Aviation Laboratory aircraft-in-the-loop platform to demonstrate the design efficacy.

关键词： aerospace fault diagnosis hardware-in-the-loop testing linear parameter varying systems sliding mode observer

来源：评论

学校读者我要写书评

暂无评论

Investigation of active torsion bar actuator configurations to reduce vehicle body roll

引用

VEHICLE SYSTEM DYNAMICS 2006年第9期44卷 719-736页

作者： Cimba, David Wagner, John Baviskar, Abhijit Ford Racing Technol Dearborn MI 48120 USA Clemson Univ Dept Mech Engn Automot Res Lab Clemson SC 29634 USA

The increasing popularity of sport utility/light-duty vehicles has prompted the investigation of active roll management systems to reduce vehicle body roll. To minimize vehicle body roll and improve passenger comfort, one emerging solution is an active torsion bar control system. The validation of automotive safety systems requires analytical evaluation and laboratory testing prior to implementation on an actual vehicle. In this article, a computer simulation tool and accompanying hardware-in-the-loop test environment are presented for active torsion bar systems to study component configurations and performance limits. The numerical simulation illustrates that the hydraulic cylinder extension limits the active torsion systems ability to provide body roll angle reduction under various driving conditions. To compare the control systems time constant and body roll minimization capabilities for different hydraulic valve assemblies and equivalent hose lengths, an experimental test stand was created. For a typical hydraulic pressure and hose diameter, the equivalent hose length was not a key design variable that impacted the system response time. However, the servo-valve offered a quicker transient response and smoother steady-state behavior than the solenoid poppet actuators that may increase occupant safety and comfort.

关键词： Chassis dynamics hydraulics hardware-in-the-loop testing design analysis

来源：评论

学校读者我要写书评

暂无评论

Evaluation of driver steering preferences using an automotive simulator

引用

INTERNATIONAL JOURNAL OF VEHICLE DESIGN 2014年第2期66卷 124-142页

作者： Black, Jesse Freeman, Paul T. Wagner, John R. Iyasere, Erhun Dawson, Darren M. Switzer, Fred S. Honda R&D Amer Inc Raymond OH 43067 USA Clemson Univ Dept Mech Engn Clemson SC 29634 USA Jacobsen Textron Co Charlotte NC 28273 USA Clemson Univ Dept Elect & Comp Engn Clemson SC 29634 USA Clemson Univ Dept Psychol Clemson SC 29634 USA

A high fidelity steering simulator was developed and validated to support driver steering preference studies. The steering simulator was validated using in-vehicle test data and two pilot studies before application to a demographics-based driver preference study with 43 subjects. This latter study reflected the following trends: drivers who used their vehicles for utility purposes preferred faster steering ratios and heavier steering torque in residential, country, and highway environments. In contrast, car enthusiasts preferred fast steering ratios in residential and country environments and light steering torque on the highway. These relationships may be used to set steering targets, during future vehicle developments, to accurately match vehicles to their intended market segments.

关键词： vehicle dynamics steering systems human subject testing assessment driver preferences automotive simulator hardware-in-the-loop testing steer-by-wire steering ratios steering torques

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：