Applied Mechanics and Materials Vol. 302

Abstract: This paper proposes an advanced technology to enhance the transfer capability of transmission system using flexible AC transmission system (FACTS). FACTS consists of thyristor-controlled series capacitor (TCSC), thyristor-controlled phase shifting transformer (TCPST), thyristor-controlled voltage regulator (TCVR) and static var compensator (SVC). The location of FACTS and their associated values dominate the transfer capability of transmission system. To determine the optimal solution of FACTS, this paper presents an enhanced differential evolution (EDE) approach to deal with this type of optimization problem. In comparison with basic DE, EDE uses a variable scaling mutation to adaptively adjust the mutation operation and enhance the global search capability of basic DE. The proposed method is verified on an IEEE 30-bus 41-transmission line system. To verify the performance of the proposed method, the basic DE and particle swarm optimization (PSO) methods are also implemented using the same database. The results show that the proposed approach provides better transmission loadability with less execution time than the existing methods.

Abstract: In a semi-conductor FAB, the chiller plant is a major drain of power among the supporting facilities. According to ISMI, the air-conditioning system consumes a quarter of the total electricity supply of a semi-conductor Fab, even more for some older Fabs. Thus, cutting down the power consumption of the chiller plant becomes extremely important to save energy. Therefore, a study was made to achieve 3% power reduction for the chiller plant. The purpose of this paper is to report the strategies used for the power reduction through testing, adjusting and balancing, and TAB. The strategies included: development of an experimental model for the chillers’ performance, the establishment of energy-efficient operational strategies, the enhancement of cooling tower energy efficiency, and conducting a full-scale experimental investigation. The development of this experimental model utilizes the ASHRAE Guideline 14-2002 as a tool, and is integrated with the BEMS system to perform a remote real time online energy auditing system, within which an intelligent operational strategy has been implemented.

Abstract: During high pressure die casting process, molten metal (aluminum) is injected with a die casting machine under considerable pressure into a steel mold or die to form products. Usually, during the process, the components can undergo several damages such as hot and abrasive wear, metal corrosion and plastic deformation. In order to increase the die life, a surface modification through the application of a Physical Vapour Deposition (PVD) coating can be done. This paper deals with the wear behaviour of a nanocomposite coating (AlSiTiN) deposited onto hot-working tool steel and onto a ion nitrided hot-working tool steel. The characterization includes: nanoindentation test, adhesion test, wear testing at high temperature and optical profilometry. Results showed that the nitriding step had a beneficial effect in terms of hardness, while adhesion between the coating and the substrate was reduced . The film exhibited good wear resistance, with adhesion phenomena as main mechanism.

Abstract: One of the challenges today is to build software frameworks for the embedded software in mechatronic systems. This paper presents the SmartModels approach which facilitates the design of a framework to create and generate easy development of software product lines solutions. One of its main strength lies in the ease with which a designer can handle the dynamic aspects of a model by dealing with variability and flexibility of user requirements. We illustrate our approach by modeling the embedded software requirements for developing anti-lock braking systems (ABS).

Abstract: Now the wild jujube processing conduce to pollution, but the demands for wild jujube kernel is growing wider. So, the urgent need to solve environmental problems in the wild jujube production. In this paper, the environment-friendly wild jujube date produced machine has been developed. This machine is designed broken with broken devices and separation devices. The role of broken device is smashed the wild jujube pericarp and flesh. The role of separation devices is separated the wild jujube flesh and date pit, the flesh and date pit can drop from different export. The experiment proved that the machine can effectively reduce water consumption and the volume of sewage to achieve the purpose of environment protection.

Abstract: Evaluation of form errors of machined parts is fundamental in quality inspection to verify their conformance to the expected tolerances. Performance of methods have been reviewed in [1].A methodology for maximizing the adherence to the specified tolerances using an integrated machining and inspection system is presented. Considering thedesired tolerance envelope of the part, an error decomposition technique is developed to model machining errors caused by the systematic and non-systematic errors in the machine tool. The model is used to adaptively plan the final machining cuts, based on inspection feedback, to enhance the geometric accuracy of the final product and is illustrated by an example.

Abstract: The operational modal analysis (OMA) was conducted on a certain industrial sewing machine to identify its modal parameters. Harmonic analysis was carried out through the OP.Synthesis method and false modes were removed according to the Modal Assurance Criterion, finally the natural frequency, damping ratio and modal shape were obtained. The vibration in the low frequencies is mainly nodding and shaking, while that in the high frequencies is local expansion of the head and motor end. The result shows that, the modal parameters of the industrial sewing machine can be well identified by the OMA method. This paper provides a valuable reference for the vibration source identification and structural vibration reduction.

Abstract: To realize the target of having a precise feature size measurement of multihole sheet metal part, this paper based on HALCON, first calibrates the camera with HALCON's calibration assistant. After acquiring the image of the multihole sheet metal part, the image coordinates of the center of fitting ellipse and the length of the long and short half shaft (pixel unit) can be gotten by proceeding a series of operations like thresholding, subpixel-precise contour extraction, fitting ellipses and so on. At last, the point coordinates in image are transformed into the plane Z=0 of the world coordinate system through translation and rotation, and the value of each feature size of the sheet metal part can be calculated.

Abstract: In order to set up a curved-shape branch artery-blood coupling model and investigate the effect of the material change in artificial blood vessel on the hemodynamic state, the method of finite element and Fluid Solid Interface in Ansys CFX was used to achieve the structural and fluid analysis with different materials. The displacement of tubular wall was increasing with the young's modulus decrease of material, and the tendency became clear. The von mises stress of the tubular wall is not well-distributed, and the value at the inlet of main artery and branch artery were large. However, at the outlet of artery was small, and the von mises stress of tubular wall with different materials has little difference. Results show that, the hemodynamic state was different with different materials, and the finite element method is helpful to the design and preparation of artificial blood vessel.

Abstract: In this study, we have made a comprehensive investigation on optimization of the compositions of PEG/PMMA binder system for water-debinding. An orthogonal test was designed and L9(33) table was chosen to investigate the influence of the molecular weight of low molecular PEG (L-PEG), high molecular PEG (H-PEG) and the percentage of L-PEG in PEGs on flaws of the injection moulded compacts after water-debinding. In addition, the ratio of PMMA content to PEGs content on flaws is also investigated. Four regions were defined as high stress region, safe debinding region, low binder removal rate region and unavailable injection region respectively. It is believed that our work could provide comprehensive and convincing principles for the manufacturing of injection-moulded ceramic parts via water-debinding.