Key Engineering Materials Vols. 579-580

Abstract: In order to verify and analysis the theory model of direct drive system, the methods of computer-aided modeling and simulation analysis in Simulink and Simscape environment were presented. Based on the theory model of direct drive system, simulation models were constructed in two kinds of different environment, the model building and analysis process were detail introduced, the simulation results were compared and experiment verification. The simulation and experiment results showed that the relative error of time domain response of simulation results under two kinds of environment is within 4%, the relative error of frequency domain response is within 4.5%. Comparing simulation results under Simulink environment with the real test results, the relative error of time domain response is within 20%, and the relative error of frequency domain response is within 15%. The consistence and correctness of the two methods are verified, the proposed methods can also be applied to modeling and simulation analysis of others Mechatronic servo system.

Abstract: As there are relatively fewer studies about non-uniform magnetic field design and numerical analysis, a model of wedge pole electromagnet has designed and analyzed based on the traditional electromagnet design method. The effects of coil turn, conductor sectional and electric current density on magnetic field intensity had also designed and calculated. The design and numerical analysis of wedge pole electromagnet were conducted which adopted the finite element simulation and optimal design method. The magnetic induction intensity for the wedge pole electromagnet in different positions of the air gap had analog calculated. The simulated and test results for distributing magnetic field can be well corresponded by considering the effect of eddy loss, material and machining errors of electromagnetic. The result indicated that the method of simulation is correct and practical. The method provides a reliable simulation analysis and empirical data for the design of non-uniform magnetic field.

Abstract: Assembly processes are very complex and hard to setup in one-time for large-scale products. Much assembly information is produced in various assembly processes and such information has not integrated or considered for next assembly processes. This leads to problems of deciding manufacturing tolerance of productions quality in the final assembly process. An object-oriented assembly information model and visualization for VAFM (Virtual Assembly Fat Model), is presented in the paper. The information modeling for assembly processes considers not only geometry data, but also non-geometry information, and those information produced by assembly process evolve, mature and derived during the whole assembly process. The paper presents modeling language based on XML and distributed storage based BSON for assembly object. The visualization of VAFM is also presented.

Abstract: In order to avoid the cumbersome wiring, limited transmission distance, high power consumption and high cost etc when using cables to transmit data in production workshops, a data transmission system combining ZigBee with USB is researched in this paper. The system hardware adopts the structure of wireless MCU CC2430 and USB interface chip CH372, the software uses the ZigBee2006 protocol stack and the USB2.0 protocol. The paper presents the hardware architecture and principle of the system and analyzes the program design of the upper and lower machines. The laboratory test results indicate that data can be transmitted from any PC to the specified one stably through ZigBee multi-hop network and the USB bus. The implementation of the experiment system has laid the foundation for the wireless data transmission between workshop equipment.

Abstract: In modern mechatronic system design process, how to shorten the design schedule and to ensure that the performance of the system designed to meet the indicator has been the focus of attention. This paper presents a mechatronic system co-designing method based on Matlab and Recurdyn. Takes a typical uniaxial direct drive system as example, describes the implementation process of the co-designing method. The dynamics model of direct drive system has been builded, on this basis, the co-simulation model based on Matlab and Recurdyn has been established. Simulates and analyzes time domain and frequency domain characteristics of the co-simulation model in different conditions, and compares simulation results and corresponding experiment results. Comparison results showed that: Open-loop time-frequency domain simulation results and experimental results are basically consistent, amplitude-frequency characteristics matching degree (ACMD) greater than 73%, phase frequency characteristics matching degree (PCMD) greater than 87%, time domain response matching degree (TRMD) greater than 89%. It verifies the validity and correctness of the co-designing method.

Abstract: An energy-efficient wireless sensor routing protocol (Energy-efficient clustering hierarchy routing protocol, EECH) for industrial field is proposed based on LEACH protocol according to the energy inefficiency of existing routing protocols and the characteristics of industrial field applications. The EECH protocol takes full advantages of the node clustering and time slot distribution in LEACH and implements the functions such as clustering, multi hop time slot distribution, node sleeping and data gathering. The cluster heads can be evenly distributed in the area with the geography location information of the wireless nodes, so that the optimal data gathering path can be established. Meanwhile, the EECH protocol can reduce the conflict in data receiving/transmitting and the energy consumption of the nodes, and extend the network lifetime through the multi hop time slot distribution and node sleep mechanism. The simulation results have shown that the death time of the first node in EECH protocol is extended double time than that of LEACH protocol. When most of the nodes dies, the amount of received data of the base station node is more than twice as much as the LEACH protocol, which has verified the energy efficiency characteristic of the EECH protocol.

Abstract: Onboard X-Band Weather Radar and data filter prediction is one of core services of the Xinjiang meteorological emergency system. Based on installation conditions provided by IVECO trunk, the structure of X-band radar antenna, lifting height and antenna work requirements, combined with the modular design concept, this paper developed the X-band weather radar antenna dedicated lifting system. This system consists of radar antenna base platform, lifting rack rails, rollers, sprockets, cylinder etc. when working, the system can not only utilize the synchronizing control strategy to ensure the system stability but also quickly set up an antenna. Based on the design of Onboard X-band Weather radar antenna lifting electromechanical system, we developed the radar data management system. In this software, Object-oriented programming language, multi-threaded programming methods and software modularity method is utilized to design the platform architecture, GIS controls and dynamic mesh technology are used to make the radar map, and based on the principle of Kalman filtering, intelligent prediction approaches are studied. Computer numerical simulation and experimental results show that the electromechanical system developed by this paper has good performance and utilized the data filtering technology to provide the reliable method for meteorological warning.

Abstract: In the hybrid vehicle applied basic research and engineering development, regenerative braking is to reduce energy consumption, reduce emissions and increase the driving range of the important means. According to the different hybrid vehicle driving conditions, how to use regenerative braking control parameters, thereby enhancing the braking energy recovery, is a hybrid car regenerative braking system of the heart. In this paper, the regenerative braking control parameters of the hybrid electric vehicle, by a reasonable choice of regenerative braking of the hybrid vehicle control parameters can increase the regenerative braking energy recovery, for reducing fuel consumption and maintain SOC are benefits. Computer Numerical simulation and simulation results show that the regenerative brake control parameters for hybrid vehicle fuel consumption and greater impact on the SOC, and the regenerative braking may affect the minimum speed limit of the regenerative braking effect, the lower the minimum speed limit the greater the braking energy recovery, thesis research is regenerative braking hybrid vehicle control parameters selected to provide a reference.

Abstract: From the start of the key technology of 3D model creating, motion simulation, visualization and interaction of roaming, and elaborates the development method of visual simulation system of virtual wind farm. this article achieved that the system not only can realize real-time roaming interaction between participants and 3D simulation system, and can simulate the interaction between the wind turbine and wind field, but also will be the application of VR technology in the dynamic analysis, processing and analysis result, enhance product development from degree and gain a higher level of details.

Abstract: In this paper, a mathematical model of the loading system is established. The characteristics of the loading channel and disturbance channel are analyzed through this mathematical model. Analysis results show that the loading channel is unstable and disturbance torque leading the input command. It directly impact on the output torque, serious affect the systems loading precision. Characteristics of the loading system are analyzed, and the results show that stiffnesss effect on the loading system is twofold, should be considered at the same time. Reduce the system's moment of inertia is good for the characteristics of the loading system.