Applied Mechanics and Materials Vols. 380-384

Abstract: This paper proposes an adaptive sliding-mode observer (SMO) for a low-speed interior permanent magnet synchronous motor (IPMSM) drive. In this paper, an adaptive SMO is employed to estimate the rotor speed and extended EMF, a soft phase locked loop (PLL) technology is used to estimate rotor position due to its strong robustness since under voltage phase unbalance or polluted and variable-frequency environment. The global asymptotic stability of the proposed adaptive SMO is verified using Lyapunov stability analysis with considering motor parameter variations. Simulation results are presented to verify the principles and to demonstrate the effectiveness of the proposed method.

Abstract: To meet enterprise-class application, the paper constructs a general distributed value-added logistics services platform for real-time tracking and querying the goods during storage and shipping process. Based on RFID, GPS and GSM/GPRS to improve storage and transport efficiency, the whole project consists of vehicle-mounted terminals, control center, and warehouse management system. Focused on the onboard system, architecture design and software implementation of terminals are given. The result shows that the system can provide some references for addressing the transparency of the third party logistics and efficient collaboration.

Abstract: One method which is based on model to settle the long development cycle of driver motor control software is adopted for Electric Vehicle (EV). It is to achieve Field Oriented Control algorithm (FOC) designing, model building, and microcontroller driver integration, task scheduling, code generation; Model simulation experiments are completed aiming at three kinds of running conditions such as a constant speed, accelerating, on load; finally, these running conditions are realized in EV and dynamometer platform. Simulation and experimental results show FOC has a well performance on speed regulating by comparing technical parameters with Chang An Ben Ben Mini, adopting the method also shorten the development cycle of motor control software.

Abstract: This paper develops a sliding-mode controller with fuzzy rules for the single magnetic levitation system with delay, different signals and interference. The control algorithm comprises a sliding-mode controller which is designed for enhancing robustness when plant uncertainties, and a fuzzy controller which is designed for smoothing the control input when switching at these boundary manifolds. An algorithm is presented for selecting the coefficients of the swithing plane such that the overall closed-loop system has stable eigenvalues. A control input is shown to be smoothing and overcome the chatter. The performance of the single magnetic levitation system is obtained by simulation and experimental results which show that the proposed fuzzy sliding-mode controller algorithm is effective for tracking different signals with interference.

Abstract: This paper address the problem of generating invariants of hybrid systems. We present a new approach, for generating polynomial inequality invariants of hybrid systems through solving semi-algebraic systems and quantifier elimination. From the preliminary experiment results, we demonstrate the feasibility of our approach.

Abstract: With respect to the conventional hydraulic broaching machine, the all-electric CNC broaching machine has many advantages. This paper combines the digital servo control system, the double ball screw and the linear motion rail to realize broaching for the two workpieces internal threads of the different rotations and lead distances. The DSP-based full-AC drive control system was developed. The observer is used to observe the speed instead of measuring the speed using the velocity sensor such as the encoder. It solves the drive control problems for the speed-sensorless servo-motors. That is in line with the trend of the CNC broaching machine technology toward the electronization, high-speed and preciseness.

Abstract: The Due to the error, parallel manipulators always exhibit some position and orientation errors at the mobile platform. The analysis of accuracy is carried out to find the source errors which affect the pose accuracy of the end-effecter in terms of the error model. The accuracy synthesis is implemented to obtain the geometry tolerance of the major parts affecting the uncompensable pose error. In order to finish these works, one method is proposed, which can also be used to handle the similar mechanism

Abstract: Flight simulator control loading system is an important part of the flight simulator, and it provides operating force people feeling system for Pilots. This paper introduces the working principle of digital control load system, and describes in detail the simulation and application of the electric servo loading system in the flight simulator. After tested the system has reached the ideal simulation results.

Abstract: in order to solve the poor adaptability problem with the traditional reentry guidance, A new evolved Acceleration Guidance Logic for Entry (EAGLE) is studied for the Reusable Launch Vehicle (RLV) here. According to the guidance, the reference drag acceleration profile is updated every period based on the predictive range-to-go. In the lateral profile, basing on the generated reference drag profile, two reversal times are got successively through numerical predictive method. The technique of feedback linearization is used to track the reference drag acceleration profile. The algorithms of updating the reference drag profile and searching reversal times are both the method of golden-section search, so the EAGLE method can be performed onboard. The simulation results based on different reentry conditions show that the approach has good robustness and real-time ability.

Abstract: Road safety has drawn wide attention from the whole society in recent years. The system of collision warning and anti-collision as an emerging vehicle safety technology can effectively help drivers avoid rear-end accident. This paper uses driver assistance system to analogously simulate true condition of driving and road. By real-time monitoring safe distance between two vehicles under the condition of following, this paper optimizes and adjusts the existing simulator. Drivers can avoid some untimely happening or unnecessary warning through improved and optimized simulator, which provides crucial technical conditions for producing more controlled and real-time interactive simulator.