Design of Hardware-in-Loop Simulation System Based on Pervasive Computing Technology

These days computer aided simulations are being used to perform hardware in loop (HIL) simulations. This is to ensure the safety and economics, as the real flight test cannot easily be done. Moreover due to the latest controller design techniques, which have further complicated the design implementation, the use of computer is inevitable for control system realization. The HIL simulation in real time validates the theoretical design of attitude control system, the stability of autopilot during the real flight and the consistency between the hardware characteristics and the theoretical analysis. This simulation is carried out in a real time environment and is a major step before the finalization of autopilots and overall control system for the actual flight. This paper presents various steps taken during HIL simulation and the discussion on major test results.

KY Boost converter is a negative output voltage DC-DC converter, that is polarity of output voltage is the reverse of input voltage. KY Boost converter operates in continuous conduction mode and it has non-pulsating output current, which decreases the current stress on the output capacitor as well as reduces the output ripples. Real time simulation of KY Boost converter is useful in testing the converter performance in variety of applications. Here real-time simulation of KY converter is done using miniature Full Spectrum Simulator, a simulation system to address the entire spectrum of simulation namely, offline simulation, real time simulation and hardware in loop(HiL) simulation. Average modelling of the converter is done and KY converter library is created in FSS-Mini. FSS is in its beginning stage and it supports assembly level solver options. The simulation results will be available in real-time and can be interfaced with a controller in the HiL simulation. The KY converter library can be therefore, effectively used in controller development and testing purposes.

In order to resolve the problem that DGPS (differential global positioning system) can not be used in the HIL (hardware-in-loop) simulation of aerocraft, but only simulated by math modeling, a method how to use DGPS in HIL simulation was brought forward on the base of GSS7700GPS simulator and NovAtel DGPS receiver. The DGPS simulation system configuration fig of aerocarft was shown.The trial data of single GPS and DGPS was acquired and plotted in the table. Comparing single GPS trial data with DGPS trial data, it improved that DGPS has more positioning accuracy than single GPS. The method realized that the whole DGPS out-of-doors running process could be simulated realistically in static environment of laboratory. The accuracy and reliability of DGPS simulation of aerocraft were improved greatly by using the method.

Aiming at the development of ESP system, hardware-in-loop simulation (HILS) method based on virtual integrated technology, which combines virtual model by ADAMS/Car, virtual controller by Simulink, and LabVIEW platform, is introduced. The principle of the HILS method is explained. The structure and relation among parts of the HILS system based on virtual integrated technology are discussed, and the HILS system for ESP is developed. Experiments on this system are performed and the results are analyzed and compared.

Terminal Sensitivity Projectile is served as the research object and the hardware-in loop simulation technology is employed to design the indoor hardware-in loop simulation system for infrared sensor of terminal sensitivity projectile. This system employs the Multi-Gen Creator to build the scene model and the target three-dimensional geometrical model as well as employs the Vega to produce the digital scene of detection field for infrared sensor. Meanwhile, the detection system of terminal sensitivity projectile--- infrared sensor is served as the substance and introduced into the simulation system to participate in the test and consist of the closed loop with other physical models and mathematical models as well as complete the real-time simulation function of terminal sensitivity projectile. The simulation result indicates that the infrared sensor can completely identify the target and is provided with such advantages as low false detection ratio and low omission ratio.

In high speed train, to obtain precise speed is important to high performance control, though the transducers used in the train are usually low resolution. The speed measurement was analyzed both on precision and update rate according to the control requirement. A comprehensive measure and calculation solution for traction motor speed measurement is presented. Measure clock period is adjusted according to motor’s different speed range and can obtain good measurement precision both in low and high speed range. The speed update rate can also be guaranteed. The proposed method is implemented and validated by hardware in loop simulation system.

This paper discusses a real-time obstacle avoidance algorithm and its implementation for an underactuated flat-fish type autonomous underwater vehicle (AUV) in 3D space. The algorithm has been developed using multi-point potential field (MPPF) method and its real-time testing is carried out using hardware-in-loop (HIL) simulations. In MPPF method, a region of predefined radius on a hemisphere in the positive x-axis around the bow of an AUV is discretized into equiangular points with centre as the current position. By determining the point at which the minimum total potential exists, the vehicle can be moved towards that point. Here the analytical gradient of the total potential function is not calculated as it is not essentially required for moving the vehicle to the next position. The MPPF method is interfaced with dynamic model of an underactuated flat-fish type AUV and it is tested and verified using HIL simulation tool. The details of the dynamics of AUV, MPPF method and its implementation, development of HIL test bench and the simulation results are presented in this paper. The results show that the proposed MPPF method is very effective for obstacle avoidance in 3D space and can be used in the real-time control of the AUV.

In this study, submillimeter level accuracy K-band microwave ranging (MWR) equipment is demonstrated, aiming to verify the detection of the Earth’s gravity field (EGF) and digital elevation models (DEM), through spacecraft formation flying (SFF) in low Earth orbit (LEO). In particular, this paper introduces in detail an integrated BeiDou III B1C/B2a dual frequency receiver we designed and developed, including signal processing scheme, gain allocation, and frequency planning. The receiver matched the 0.1 ns precise synchronize time-frequency benchmark for the MWR system, verified by a static and dynamic test, compared with a time interval counter synchronization solution. Moreover, MWR equipment ranging accuracy is explored in-depth by using different ranging techniques. The test results show that MWR achieved 40 m and 1.6 m/s accuracy for ranging and range rate during tests, using synchronous dual one-way ranging (DOWR) microwave phase accumulation frame, and 6 m/s range rate accuracy obtained through a one-way ranging experiment. The ranging error sources of the whole MWR system in-orbit are analyzed, while the relative orbit dynamic models, for formation scenes, and adaptive Kalman filter algorithms, for SFF relative navigation designs, are introduced. The performance of SFF relative navigation using MWR are tested in a hardware in loop (HIL) simulation system within a high precision six degree of freedom (6-DOF) moving platform. The final estimation error from adaptive relative navigation system using MWR are about 0.42 mm (range/RMS) and 0.87 m/s (range rate/RMS), which demonstrated the promising accuracy for future applications of EGF and DEM formation missions in space.

At the lunar patrol detection stage, effective and accurate inspection path planning is the prerequisite and basis for lunar missions. This article designed and implemented lunar surface inspection simulation and validation system, the system is to verify the part inspection technology by computer simulation technology, with a view to provide some technical support for autonomous navigation, autonomous mission planning, and related research of the future Chang'e-third surface inspections.

In the field of real time HiL (hardware-in-Loop) simulation of rail transportation traction electric drive system, in order to solve the problems that real-time simulation model, based on the equation of equivalent circuit state, occupies too many resources of system and lacks universality, and it is difficult to achieve on-line adjustment of variables. This paper presents the analysis and modeling of the basic components such as inductor, resistor, capacitor, four-quadrant convertor and so on. It realizes the real-time simulation of the four quadrant converter system. What’s more, the feasibility and effectiveness of the simulation model are verified by comparing the real-time simulation results with the experimental data.

Research and design of simulation and verification system of intelligent expressway based on ETC big data

study presented is the project: A Study on the Techniques of Major Danger Supervision And Precaution on the subject of The Evaluation and Macro-control Techniques of Major Danger Source of Key Technology of Labor Safety, a national key scientific and technological project of the 8th five-year plan. As shown in the study, the modern technological means will enable the solution of the safety observation and control of major danger source in the field of labor safety. Hence a supervision and precaution system capable of temporary supervision, forecasting of abnormal situation and immediate control of critical state, such as formed by the integration of sensor technology, multimedia technology, computer technology, technology of diagrams and figures, model and simulation technology and automatic control technology, based on the theories and practice of systematic safety engineering, will serve as the technical support to improve the level of safe working.

Pervasive computing has a great potential for many next-generation IT applications such as in e-learning. Pronunciation teaching is an essential part in Mandarin e-learning system. In this paper, tone analysis is made on the basis of wavelet transform (WT) which has good time-frequency localization as well as the advantage of being able to simulate the auditory property of ear. It has found its applications to exact pitch detection and accurate Mandarin tone recognition. By integrating the pervasive computing and tone analysis technology, a pervasive computing based Mandarin e-learning system is designed and implemented.

Hardware-in-Loop (HIL) simulation plays an important role in distributed energy resource (DER) systems design, analysis and development. These DER-based systems utilize interfacing power electronic converter units with primary controllers, connected to the distribution network. Before commissioning these DER units, the performance of each of the converters and control system needs validation both independently as well as in microgrid scenario. In such a situation, Controller HIL based simulation and analysis enables validation of control without need for actual plant hardware development. In addition, this approach accelerates system development time, and also enable ease of portability of the developed control algorithms from testing to implementation phase. In this work, a digital-signal-processor based CHIL test-bed for solar-storage integration has been presented using Typhoon 402 HIL Platform. The design of the power electronic system, interface to digital controller, and its performance has been shown with respect to case studies.

A pervasive computing system (PCS) requires that devices be context aware in order to provide proactively adapted services according to the current context. Because of the highly dynamic environmen...