Parameter Identification and Linear Model of Giant Magnetostrictive Vibrator

A linear magnetization model is built to replace the Jiles–Atherton model in order to describe the relationship between the magnetic field intensity and the magnetization intensity of the giant magnetostrictive vibrator (GMV). The systematic modeling of the GMV is composed of three aspects, i.e., the structural mechanic model, the magnetostrictive model, and the Jiles–Atherton model. The Jiles–Atherton model has five parameters to be defined; hence, its solution is so complex that it is not convenient in application. Therefore, the immune genetic algorithm (IGA) is applied in the identification of the five parameters of the Jiles–Atherton model and it showed a higher stability compared with the identification result of the differential evolution algorithm (DEA). The identification parameters of the two algorithms were employed, respectively, to calculate the excitation force and it was found that the relative error of IGA was evidently smaller than that of DEA, indicating that the former was more reliable than the latter. According to the identification results of IGA and based on the least square method (LSM), curve-fittings to the magnetic field intensity and magnetization intensity were conducted by using the linear function. And the linear magnetization model was built to replace the Jiles–Atherton model. Research results show that the linear model of the GMV can be established by combining the linear magnetization model with the structural mechanic model as well as the giant magnetostrictive model. The linear magnetization model, which has great engineering application value, can be applied in the open-loop control of the vibrator.

Auslegung von Servopressenantrieben/Design of Servo Press Powertrains

Die Auslegung des Antriebsstrangs einer Servopresse stellt einen komplexen Prozess dar. Aufgrund der konstruktiven Wechselwirkung der Komponenten ist dieser mit einer potenziell großen Anzahl von Iterationsstufen, häufig auch im Kontakt mit Zulieferern, verbunden. Im Beitrag wird ein Softwaretool vorgestellt, das den Entwicklungsprozess einer Servo- presse beschleunigt und variabler gestaltet. Im Rahmen des Vorhabens wurde neben einem parametrischen Motormodell ein variables mechanisches Modell eines Servopressen-Antriebsstrangs erstellt und validiert.   The design of a servo press drive is a complex process. Due to the interaction of the design components in the drive train, it is subject to a potentially large number of iteration stages, often also in contact with suppliers. This article presents a software tool that accelerates the development process of an electrical servo press drive. Within the presented research project, a parametric motor model and a mechanic model of a servo press powertrain were developed and validated.

Fluid-mechanic model for fabrication of nanoporous fibers by electrospinning

A charged jet in the electrospinning process for fabrication of nanoporous fibers is studied theoretically. A fluid-mechanic model considering solvent evaporation is established to research the effect of solvent evaporation on nanopore structure formation. The model gives a powerful tool to offering in-depth physical under-standing and controlling over electrospinning parameters such as voltage, flow rate, and solvent evaporation rate.

On Spiral Spring in Elastic Deformation

Spiral spring is one of most important components in mechanical systems. According to literatures, there are only few studies on spiral springs. Using the Castiliago’s method and Mohr’s theorem, the mechanic model of spiral spring in elastic deformation is developed. As a typical case, Archimedes spiral spring is studied in details and experiments are also conducted to validate the mechanic model. Experiment shows that the theoretical analysis and experimental result matches very well, therefore the mechanic model can be used to estimate the deformation of spiral spring and to guide and facilitate the design of spiral spring.

Dynamic Research of Knitting Element for Computerized Flat Knitting Machine Based on ANSYS/LS-DYNA

Based on research on the knitting processes, an impact mechanic model for knitting elements was established to investigate the variation of the impact force in vertical direction between the cam and the select jack. The variation of the displacement, velocity, acceleration of the select jack and the stability for the needles’ moving has been confirmed by the simulation of knitting process based on the software ANSYS/LS-DYNA. Furthermore, the variation of the select jack has been confirmed by experimental measurement during the knitting process. The data of the experiment results were in accordance with the ANSYS’ simulation which verified the correctness of the ANSYS’ analysis. It provided a theoretic basis for the design of computerized flat knitting machines.

The Construction and Property Analysis of Bogie Wheel with Damping Structure

This paper introduces a new-type bogie wheel and its properties, i.e., bogie wheel with tubular spaced-damping, which has vibration-reducing buffering functions. The mechanic model of bogie wheel based on crawler bulldozer of some type was built. Matlab software was used to simulate such bogie wheel. The results show that bogie wheel with spaced-damping can effectively buffer the vibration on such bulldozer under different load cases.

The Granule Mechanic Model for Numerical Simulation of Coal Stream in Coal-Fired Power Plant

In this paper, the contact models of particle system of coal stream are analyzed; the granule mechanic models of coal stream in different imposed conditions are summarized. Using 3d-discrete element method, a particle mechanic model of clumps is constructed by the contact bonding model to simulate the cataclasm phenomena during the coal conveying of Coal-fired power plant, which plays an important role in assuring the fidelity and integrality of 3D virtual coal conveying scene.