Applied Mechanics and Materials Vols. 321-324

Abstract: According to the current domestic crane safety protection measures are not perfect situation, this paper used DM3730 processor, the embedded theoretical basis, combining the industrial field work environment in consideration, design a set of perfect crane safety monitoring system, accept and deal with crane various signals, various types of emergency situations and signal change to make effective response measures to avoid accidents.

Abstract: In this paper a theoretical approach of the generalized hybrid model and time cycle optimization of a mechatronics line served by mobile robot with manipulator is presented. Thus, the considered global model is a hybrid one as it is based on the dynamics of discrete and continuous components which interact on a basic level. The generalized Synchronized Hybrid Petri Nets (SHPN) model describes this hybrid system with N degree of repetitive tasks. The advantage of this generalized approach consists in the optimization of the process parameters. Consequently, a time cycle optimization which is based on the minimization of temporal duration events is proposed. The proposal is exemplified by the assembly/disassembly process of a mechatronics line (A/DML), served by a wheeled mobile robot (WMR) equipped with a robotic manipulator (RM).

Abstract: Considering the robust control of stabilized platform of rotary steering drilling system, an adaptive fuzzy sliding mode control strategy based on genetic optimization is presented. Firstly, the universal approximation property of fuzzy system is used to approximate the uncertain external disturbance upper bound of stabilized platform under wording condition. Subsequently, sliding mode controller is designed to guarantee the robustness of the closed-loop system and sign function is replaced by bipolar sigmoid function to weaken chattering. Finally, genetic algorithm (GA) is applied to search the optimal controller parameters, including switching function coefficient, membership function of fuzzy system, adaptive coefficient of fuzzy system and sigmoid function coefficient. Simulation results show that this control strategy can make stabilized platform achieve optimal control performance and robustness.

Abstract: Rolling mill as a class of key iron and steel industry metallurgical equipment, responsible for the national production of heavy plate strip, its productivity and product quality of course become the focus of attention. In a large rolling mill equipment, rolling mill drive system as the interface with the electrical system, electrical energy into mechanical energy, and rolled steel production process to meet the torque and speed required for high precision and high dynamic control performance. In this paper, plate and strip rolling mill of the early nonlinear dynamic system as the research object, through theoretical analysis, numerical simulation and experimental study, done the following work.For the beginning of the process of rolling mill main drive system of the nonlinear characteristics of chaotic motion, through the theoretical analysis has proved that the original vibration system to become passive equivalent non-linear systems, the use of passive non-linear system characteristics, a class of moving boundary mechanical vibration system to exert control over the chaotic behavior, simulation experiments show that the control strategy is not only achieved rapid control of the system, and control is simple, easy to achieve.

Abstract: This paper mainly reviews the development of permanent magnet synchronous motor drive system. It presents several approaches of PMSM control strategies, including control strategies based on classical control, modern control and intelligent control. Theoretical background briefly describes the properties of these control techniques. Among these control strategies, vector control and direct torque control are considered as the mature methods for PMSM motors control currently. Advanced control strategies, with adaptive control, variable structure control and intelligent control included, improve the performance of PMSM in some respects, such as variations of plant parameters sensitivity, external disturbance and so on. It shows that the researches in this area are still a popular research topic. Finally, this paper prospected the foreground of the control strategies for PMSM.

Abstract: Torque ripple is a disadvantage of SRM. Using DTC strategy can cut down the ripple. DTC is a kind of Bang-Bang control, the result is limited. Fuzzy control can measure the error level to get better result. CCC strategy, DTC strategy and fuzzy DTC strategy are simulated in the article. Simulation results show that DTC strategy had cut down the ripple to some extent than CCC and it works better by combining with fuzzy control.

Abstract: This paper proposes a system design for identification and anti-counterfeiting of goods using RFID technology. The system consists of RFID reader, antenna and tags, since most application systems are cost sensitive, different protocols are compared and then ISO/IEC 15693 is selected as communication protocol. By tuning the value of Q and by matching the resonance for both reader and tags, the systems performance has enhanced a lot especially for the distance of read and write. To search RFID tags easily, 16 slots anticollision is adopted and gives a command design flow. For the anti-counterfeiting, EAS method is used, by setting the related memory bit, EAS function is activated and can protect goods from stealing. Such system has a variety of applications such as libraries, asset management, logistics and so on.

Abstract: There are still plenty of shortcomings in existing construction elevator,such as low automation ,high cost and no communication equipment between the driver and users. The CAN bus and PLC are used in construction elevator control system to achieve the construction elevator automatic control, The experimental results show thatthe system can save almost one hundred control signal wires,it makes the installation and maintenance more convenient,and enhances the system function of real-time,reliability,flexibility.

Abstract: Workspaces of two plane-symmetry parallel machine tools whose limbs are composed of the revolute joint, the prismatic joint and the spherical joint were studied comparatively in this paper. Firstly, manipulators of the plane-symmetry 3-RPS parallel machine tool and the plane-symmetry 3-SPR parallel machine tool were introduced, and their simulation manipulators were given. Secondly, the workspaces of the plane-symmetry 3-RPS parallel machine tool and the plane-symmetry 3-SPR parallel machine tool were solved and expressed in the same figure on the basis of the computer aided geometric technique method, respectively. Lastly, indices measuring the workspace were defined, and workspaces of the plane-symmetry 3-RPS parallel machine tool and the plane-symmetry 3-SPR parallel machine tool were analyzed comparatively from two aspects: positional workspace and posture angle.

Abstract: For external disturbances and parameter perturbation problem of Electromagnetic guiding system, the adaptive sliding mode control method is used, take advantage of sliding mode switching surface eliminate the steady-state error and increase the precision at steady-state and robust performance of single electromagnetic guiding system. Matlab Simulation results show that the proposed control strategy shows good tracking performance and strong robustness