Advanced Materials Research Vols. 463-464

Abstract: The paper approaches the optimal design of the mechanical systems based on parametric technique in MBS (Multi-Body Systems) environment. The optimization process is developed in five steps: parameterizing the virtual model for creating the relations between the objects (points, markers, bodies, constraints, forces), defining the design variables, defining the design objective and constraints, performing parametric studies in order to identify the sensitivity of the design objective at the modification of the design variables, and optimizing the model on the basis of the main design variables (with great influence on the design objective). For applying the optimization procedure, a solar tracking system used for increasing the energetic efficiency of the photovoltaic modules has been considered. The study is performed by using the MBS environment ADAMS of MSC Software.

Abstract: This work proposes the optimization by simulation of fabrication in manufacturing robotized systems, designing in principle of a flexible fabrication cell composed of many modules (centering, turning, etc) for machining of a product family, cell that is to be operated by an industrial robot whose purpose is the handling of parts within it (transport of parts among the cell modules). The production task shall be reviewed first, within which the typological nucleus to be machined, using the mathematic theory of utilities. The next step consists in determining the static configuration of the MRS in order to set the type and number of modules-operation using the mathematic modeling. Through the method of fictive ranges it shall be calculated the cost of the flexible production systems and it shall be determined the spatial arrangement of processing modules from MRS.

Abstract: This research was conducted during 1984-2009, on an irrigation reel hose machine - IATF-300 type. The paper presents the mathematical model that has been used to optimize hydraulic engine performance, its attempts where made taking in consideration the engine recommendations to test it to a load charge.

Abstract: Today, companies put their customers at the center of all activities and revise their marketing and sales strategies based on IT[1]. The companies, regardless of type of activity, size and structure, need to establish efficient management systems to evaluate their customer relationship system and provide other organizational tools to determine, lead, manage, and evaluate management strategies[2]. The purpose of this paper is to present a pattern based on EFQM model which is studied systematically in small and medium industries in order to get proper and unified approach in customer relationships by considering having proper approaches, results of approaches, and evaluating and reviewing of criteria .In this research we concentrate on the case study of Golsar Fars sanitary ware company among SMEs companies of sanitary ware industry in Iran in order to investigate the qualitative aspects of manifestations and see how the proposed pattern can be used by experts experienced in customer relationship management to help them to coordinate their activities with continuous improvement of the organization.

Abstract: Object tracking in three dimensional environments is an area of research that has attracted a lot of attention lately, for its potential regarding the interaction between man and machine. Hand gesture detection and recognition, in real time, from video stream, plays a significant role in the human-computer interaction and, on the current digital image processing applications, this represent a difficult task. This paper aims to present a new method for human hand control in virtual environments, by eliminating the need of an external device currently used for hand motion capture and digitization. A first step in this direction would be the detection of human hand, followed by the detection of gestures and their use to control a virtual hand in a virtual environment.

Abstract: In the control of the position of the robots systems one of the more important is to assure the minimum errors between the output and the target. All advanced researches in the word propose to use the neural network (NN) and the learning algorithm like Widrow and Hoff, or Levenberg-Marquard by using the least mean square (LMS) of errors and Delta rule, or back propagation training algorithm. Present paper is showing the mathematical model and numerical simulation of some important neurons types used in many applications that require extreme precision and neural network. All assisted researches were made with the owner LabVIEW virtual instrumentation. The research results and virtual LabVIEW instrumentation can be used in many other mechatronics applications.

Abstract: With the producing process becoming more and more complex, Enterprise replies on automatic simulation system from more aspects. To improve the efficiency of automatic simulation system on training, method Design and platform update. The virtual Reality Technology is applied to simulation system and a novel method is proposed, the structure and workflow is interpreted details. Finally a application case about chemical industry control is introduced and the effective of technology proposed is proven.

Abstract: Fuzzy risk priority numbers (FRPNs) were proposed for assessment of the probabilistic risk by synthetically using fuzzy set theory, failure mode and effect analysis. The priority rank of failure modes is evaluated by fuzzy risk priority number in the fuzzy failure mode and effect analysis, where occurrence probability ranking, effect severity ranking and detection difficulty ranking are all fuzzy weighted geometric mean, and the FRPN can be computed using alpha-level set and optimization model. An engine example was provided to illustrate the proposed fuzzy FMEA and the detailed computational process of the FRPNs.

Abstract: This paper presents the general structure, implementation features and a software module for tracing, visualization, shape recognition, measurement and efficiency evaluation for 3D model generation of objects to grip by an anthropomorphic gripper. Viewing is possible with an advanced video camera and shape recognition is possible through classifiers method. After setting the object shape, the gripper will approach the target, and its displacement is measured. Implementation, and how to work with the software designed are possible in several steps that are specified and described. The performance evaluation of the software system is based on a series of external factors, the most important being: light conditions; quality of video device; capture size; the human factor through a series of experiments focused on the system's ability to cope with external factors above mentioned.

Abstract: Model updating techniques are used to update the finite element model of a structure, so that updated model can be predicted the dynamic behavior of an actual assembly structure more accurately. Most of the model updating techniques neglects damping and so amplitudes of vibration at resonance and antiresonance frequencies cannot be predicted by using of these updated models. In dynamic design of structures predicting of these properties is necessary. This paper presents a new technique to create an accurate finite element (FE) updated model of complex assembly structures consisting of substructures and real joint by considering damping of them. Given the fact that modal testing of real joints (such as bolt with some washers) are almost impossible. The updated model of assembly structure is obtained in four steps. In the first step, mass and stiffness matrix of substructures, joint and assembly structure are updated using modal data and Eigen-sensitivity approach. In the second step, damping of assembly structure is identified using complex modal data and updated mass and stiffness matrices which are obtained in first step. In the third step, the effect of damping of joint on frequency response functions (FRFs) extracted from updated model was shown. In the forth step, damping matrix of joint is updated by using FRF-based model updating method and finally damped updated model of assembly structure compared with measured data.