Ding Fang Chen

The Design of Giant Magnetostrictive Flow Valve and its COMSOL Simulation

By combining magnetostrictive actuator with flow valve directly, the flow was precisely controlled due to magnetic materials’ properties of fast response (less than 1μs)and large magnetostrictive strain (up to 1500ppm). The structure was designed based on this theory, and the flow - displacement model of valve was established by analyzing the size of the valve opening in different incentive current. The flow field was analyzed through multi-physics analysis software COMSOL. Simulation results showed that, the continuous adjustment and precision control were realized in a certain range of flow in the valve. Therefore, it could not only adjust the flow in micro amount directly, but also can be a pilot valve for high frequency precision large flow valve.

Real-Time Virtual Instrument Platform Based on Multi-Thread Technique

In Virtual instrument (VI) established for computer based automated test and control, the process with only single thread has limits when developed for acquiring high speed data, analyzing and displaying them the meaning while. Any interference from another task may block the whole running process and cause data missing. In order to increase the throughput, responding time and multi-task processing efficiency of VI, multi-thread programming with the platform LabWindows/CVI is introduced in this paper. Contents include the two strategies to establish multi-thread program, Thread pool and Asynchronous Timer, and how to protect data with multi-thread programming. Finally, a case study showed a multi-thread VI based on Asynchronous Timer method, with the comparison of performance between single thread and multi-thread program.

Research on Mechanical Dynamics with a Use of a Vehicle Wake Generating Device Simulation and Design

There is rich automotive wake and wind resource on the highway. Power can be used for power generation, supply of electrical equipment or the highway into the grid .The paper proposes a new wind vertical axis wind generator. According to the actual conditions ,the important institutions are needed to optimize device emulation. The dynamics of shaft has a major impact on the stability of the power plants work. Use ANSYS to provide a reference for further optimization agency. Radial pendulum balls mounted to the whole device can be stable on the shaft buffer.

Applied-Information Technology with Design and Research on Innovative DIY Training Platform of Learners Based on Mechanical Properties

Since the open lab cannot improve the students’ practical ability in a good manner, and the full-featured laboratory equipment has a high cost, this paper thus designs a students’ innovative DIY training platform that quickly assists to model the KT board, in order to enhance the students’ practical skills and thinking abilities, and improve the quality of experiment teaching. The platform solves the existing DIY modeling’s issues of great difficulty in manual processing, low precision and long cycle. Based on the design platform of SolidWorks, this paper completes the parametric design of the device virtual prototype, adopts the virtual prototyping technology to make dynamics simulation analysis towards the critical parts, and verifies the rationality of this mechanism design and correctness of function implementation.

New Intelligent and Efficient Pesticide Sprayers in Mechanical Manufacturing Engineering

In view of the traditional low mechanization,degree of automation and lack of humanization etc, a n-ew intelligent and efficient pesticide spraying machine can be created to add pesticide to cotton.Completed parametric design of the devices virtual prototype by SolidWorks,and we apply virtual prototyping technologyto key parts to go on dynamics simulation analysis,to verify the reasonableness of this mechanism design and correctness of the function to achieve.

Research on Mechanical Manufacturing with Design and Analysis of an Intermittent Separation Bricks Machine

In order to better meet the needs of brick mechanized packaging,design full-automatic brick packaging line intermittent separate mechanism,cam with partial gear combined with exercise, can be a smooth and efficient completion of the process of lift brick. According to the actual functio -nal requirements,calculate the size of the main components.Agencies coordinated through comput-ational analysis, operation with a fixed motivity driven, by changing the number of teeth of the partial gear to meet the separation requirements of the different thickness brick.By the dynamics simulation of the mechanism,to determine whether the mechanism meets the design requirements.

The Development and Application of Smart Material Pumps

This paper reviews the characteristics of smart materials, such as Piezoelectrics (PZT), shape memory alloys (SMA) and mganetostrictive materials (Terfenol-D). Since the properties of these smart materials vary greatly in terms of free strain and actuation stress, there is a need to identify the optimum smart materials for a particular application. From the review and comparison of different types of pumps (based on PZT, SMA and Terfenol-D), we recognize that these pumps have their unique advantages in specific application fields.

Derivation of Magnetostrictive Losses from Admittance Spectra

There are three types of losses for magnetostrictors, elastic loss, magnetic loss and piezomagnetic coupling loss, similar to the loss mechanism of a piezoelectric (elastic, dielectric and piezoelectric losses) that our group has established recent years. By introducing these losses factors we can characterize magnetostrictive losses using complex parameters. Here we derived the relationship of mechanical quality factors and losses factor based on admittance spectra expression we have established previously. By measuring accurately the mechanical quality factors QA for the resonance and QB for the anti-resonance in the admittance/impedance curve, we can derive these three physical losses to characterize magnetostrictive hysteresis loss.

Optimization and Simulation of Portable Crane's Arm System Based on MATLAB

The arm system is the central part in the design of a portable crane. The purpose of this program is to assure that the load moves approximately along the path of the horizontal direction in the process of luffing, through the optimization of the bars’ length of the arm system. Using vectors in the mathematical model, we figured out the coordinates of the bottom point of the truck-beam according to the geometric relationships of the four-bar linkage. With the appliance of proper algorithm and the idea of visualization, we calculated the reasonable length of the bars in MATLAB and transformed the results into software ultimately. The design is suitable for different types of portable cranes, and the software is very convenient and can be used in engineering.

Characterization of Magnetostrictive Losses Using Complex Parameters

Loss characterization in magnetostrictors is one of the key issues for realizing reliable magnetomechanical transducers. Concerning with the hysteresis minor loop within a relatively linear area of magnetostrictive curve, there are three types of losses, elastic loss, magnetic loss and piezomagnetic coupling loss, similar to the loss mechanism of a piezoelectric (elastic, dielectric and piezoelectric losses) that our group has established recent years. By measuring accurately the mechanical quality factors QA for the resonance and QB for the anti-resonance in the admittance/impedance curve, we can derive these three physical losses. By introducing these losses factors we can characterize magnetostrictive losses using complex parameters.