Applied Mechanics and Materials Vols. 541-542

Abstract: Chaotic management of the roadside parking causes traffic jams. The design and research of charge parking space automatically has been done in order to achieve the unmanned management roadside parking. The automatic charging parking space is mainly composed of translation guide rail, telescopic boom, solid tire part and control module; the device with high efficiency, security and stability is fully automatic. Based on different location, it has obvious effect to ease traffic pressure through the standard management.

Abstract: In this paper a simple optical coupling method for water-jet guided laser machining system is introduced and its characteristics are studied. By the introduced method the output spot pattern behind the water-jet was observed instead of the laser focus. In order to acquire the pattern a piece of glass was used to block the water-jet but let the laser through, and a light screen was placed behind the glass in a certain distance to display the pattern image. Since the image scale could be adjusted by changing the distance between the glass and the light screen, the CCD magnifying system was no longer needed. It is found that the pattern varied while the coupling condition changed. Only in small chance the pattern was a tiny spot but more commonly it was in a ring-like shape which could be easily recognized. So such ring-like patterns could be signals for optical coupling guidance. Furthermore a series of study to analyze the correlation between the pattern shape and coupling parameters was carried out by simulation with the help of Zemax.

Abstract: Cut geometry data is an essential information in current machining simulation and optimization. The tool orientation changed continuously during free-form machining become a challenge in predicting cut geometry in 5-axis milling. This paper present an extended analytical method to define cut geometry during semi-finish milling. The algorithm was developed by taken into account the existence of helical angle. The developed model was successfully implemented to generate the shape and the length of cut. From the test it was found that helical angle gives significant effect to the cut geometry.

Abstract: This paper presents finite element method (FEM) and experimental analysis on high-speed milling for thin-wall machining of Al7075-T651. Changes in cutting forces, temperature, and chip morphology according to cutting conditions are analyzed using FEM. Results of machining experiments are analyzed in terms of cutting forces and surface integrity such as surface roughness and surface condition. Variables of cutting conditions are feed per tooth, spindle speed, and axial depth of cut. Cutting conditions to improve surface integrity were investigated by analysis on cutting forces and surface roughness, and machined surface condition.

Abstract: This paper discusses the effect of changing the location of the tool point, on the mobile platform, on the kinematics of a planar parallel manipulator. It is shown that changing the position of the end-effector greatly changes the shape and the area of the reachable workspace. Global conditioning index and the structural length index are used as global indices to find the optimum location of the end-effector on the mobile platform of a parallel manipulator. The results show that the performance criteria are varying in opposite directions, the dexterity is decreasing when the workspace area is increasing. Hence, the problem of optimal design becomes a problem of determination an acceptable compromise between the two requirements. The results of the present work show that the position of the end-effector on the mobile platform should be considered while optimizing the performance of a parallel manipulator.

Abstract: This article adopts nonlinear vibration method to analyze the fluctuation process of warp yarn. Selecting Kelvin model.A differential equation of the warp yarn vibration in lengthwise and crosswise is established by Newton law.And using Galerkin truncation method to separate the variables of time and space and to discrete partial differential equations into ordinary differential equations.The vertical and lateral vibration response of the warp are analyzed by 4-order Runge-Kutta method and matlab. Getting transverse and longitudinal vibration of warp yarns.

Abstract: This paper takes dual-spindle turning center as the research object, researching on the key technology of the efficient processing and integration application, the special post processor for dual-spindle turning center was developed based on the IMSPOST, the technical problems of dual-spindle structural system and post processing algorithm for varies of processing modes were solved, the NC processing programs were generated effectively and correctly. Production application showed that: the development of post processor for dual-spindle turning center improves the automation level and quality of NC programming effectively, brings the processing capability of dual-spindle turning center full play, and provides technical support for the manufacturing of complex mechanical products.

Abstract: This paper demonstrates the synthesis of planar four-bar for path generation. The feature is that the path includes an arc segment. The users can prescribe coordinates of arc center, a precision point on the arc, and the corresponding pole. The four-bar is synthesized mainly with the aid of the Bobillier theorem. The tasks that the paths or coupler curves pass through at most two additional precision points are also considered. Several nonlinear equations thus have to be derived and combined to find the coordinates of the pivots in synthesizing the four-bar.

Abstract: This paper presents the modified quadruple-tanks process, a flexible laboratory process with an adjustable Simulink block, which is multivariable system consisting of four interconnected water tanks included with lower interacting valve. The new general form of modified quadruple-tanks mathematic model and Simulink block is developed for the advantage of control system analysis and design which can make practical use for many styles of multivariable process by adjusting the value of connected valve resistance, inlet and outlet valve ratio. In this paper described clearly about physical properties of modified quadruple-tanks process, mathematical modeling, transformation of modified quadruple-tanks process, analysis of right half-plane zeros characteristic and controller design for multivariable system. By the several models of transformed modified quadruple-tanks, they can be used to teach students in the skills of multivariable control system analysis and design, understanding control limitation due to interactions, model uncertainties, non-minimum phase behavior, and unpredictable time variations, design decentralized controllers, Implementing decouples to reduce the effect of interactions, and understanding their limitations.

Abstract: A modified Distributed Tuned Mass Damper (DTMD) design approach was proposed in this study. In the traditional DTMD or TMD design, the general approach is to focus on the attached spring (s) and damper (s) under predefined mass (distribution). In this study, the DTMD design approach is to focus on the attached masses in the DTMD system. The numerical examples will be presented to illustrate the validity and effectiveness of the proposed DTMD design approach.