Applied Mechanics and Materials Vols. 157-158

Abstract: By using pin-on-disk wear test method, the wear behavior of W9Gr4V high speed steel with smooth and non-smooth concave samples which treated by laser texturing technology was investigated between room temperature and 500 . It was found that the anti-wear ability of the non-smooth concave samples was increased more than that of the smooth ones and the anti-wear ability of the non-smooth samples was evident than the smooth ones at temperature increasing. In this paper, the anti-wear mechanism of non-smooth concave samples and wear characteristics with smooth and non-smooth samples in high-temperature were analyzed.

Abstract: Ocean large steel structures are usually constructed on the slide site, being prone to forming large deformation because of its features such as heavy weight, large bulk and great span. However, the 18 large-scale steel structures of a nickel ore project are need to building on the non-slide foundation, resulting in different settlements of foundation. Moreover, the earthquake load is one of main load of the high-level structure. And the earthquake often happens suddenly and is out of control, with devastating destructive power. To ensure the safety of construction, it’s necessary to analyze the influence of large steel structure responding to the seismic load. This paper expounds the analyzing method on the response of the large steel structure based on non-slide site to the earthquake load. This article has analyzed responses of three-dimensional finite element model to the earthquake load with ANSYS analysis of finite element, such as the stress, deformation analysis, modal analysis and transient dynamic analysis, and assessed the risk of earthquake. This paper provides a feasible and effective analyzed method for researching the response of structure built on non-slide site to the earthquake load, which has important significance for the seismic design of the structure.

Abstract: Frequency-aimed optimal structural design of stiffened shell is concerned. It is a reverse design problem for the first several modal frequencies to converge to a set of target value. A design method combined modified bi-directional evolutionary structural optimization (BESO) and size optimization is presented. Optimization model consists of skin and regular grid frame structure. To solve irregular branches and holes that often exist in ordinary topology optimization results, instead of elements, the existence states of ribs in the frame are used as design variables and sensitivity of the rib is discussed. Detailed design is conducted by size optimization. Example shows that frequency requirements are achieved. And the optimum structure is regular and clear, the localized modes problem is avoid. This is very suitable for designing airplane wind tunnel flutter test models.

Abstract: These days, research of multiple robots, which has distributed function and maximize their total ability have been frequently observed in the field of rescue robots or soccer robots tournament called ROBOCUP. This shows the rapidly growing need of more sophisticated multiple robots which are more dependable compared to function-integrated single robots. Accordingly, several studies have been made regarding sharing and distribution the knowledge which are obtained from the sensory operation. This knowledge must be utilized not only for geographical navigation but for highly complicated exercises. Asama et al. proposed the Intelligent Data Carrier (IDC) with the aim of sharing knowledge among the robots. This utilization of memory media has disadvantage of an increase in cost and redundant need of supervising system for the memory modules. Therefore, in this paper we propose the knowledge sharing system and autonomous line control system using the broad band wireless communication devices, such as wireless LAN and BluetoothR. If the robot modules are equipped with the independent communication systems, efficient and simplified unitary system shall become the practical use. This enables the robot to manage the knowledge interactively.

Abstract: In this subject, the Analysis Parametric Design Language (APDL) was used to process the parameterized finite element model of large load, long span suspended platform and simplify the structure model of suspended platform, Coupling and constraint equation was established to process the special connected construction .Study the influence of the suspended platform construction and the structure section change on the integral structure. Determine the analysis schemes of the different section, obtain the stress distribution and the structural deformation of the platform structure. Aimed at the least weight of the suspended platform structure, analyze the influence of every main structure section，the lacing bar and the web members arrangement on the suspended platform structure to provide references for the design and analysis of the large load, long-span suspended platform structure.

Abstract: This paper introduces the design of suspension mechanism of a large load and big span Temporarily Installed Suspended Access Equipment (TISAE), and acquires the expression of each of component and the wire rope based on the typical equation of force method. Setting up the mathematical optimization model and writing a program search for the optimal positions of installing wire rope. Based on ANSYS analyze the general suspension organization structure and the new suspension organization. The new suspension mechanism may take larger work load.

Abstract: Complex Products may present more than one type of defects and these defects are not always of equal severity. These defects are classified according to their seriousness and effect on product quality and performance. Demerit systems are very effective systems to monitoring the different types of defects. So, classical demerit control chart used to monitor counts of several different types of defects simultaneously in complex products. Recently, H.W. Kang et al.[7] introduced Demerit-GWMA(generally weighted moving average) and Demerit-EWMA control charts that can detect small shifts of the process mean more sensitively than the classical demerit control charts. In this paper, we present an effective method for process control using the Demerit-GWMA statistics with fast initial response. Moreover, we evaluate exact performance of the Demerit-GWMA control chart with fast initial response(FIR), Demerit-GWMA and Demerit-EWMA according to changing sample size or parameters.

Abstract: Open-front press is one of the dominating equipment for punch forming. Body frame is the primary loadbearing part of this machine, and its rigidity and intensity have great influence on the working performance. In order to optimize the structure of body frame and shorten the product development cycle, finite element analysis, which is an effective technique in CAE, is used to investigate the body frame’s deformation and stress distribution in the presented work. By taking JC21-160, a representative type of open-front press, as the analysis object, the whole procedures of this work, such as modeling, meshing, loading, constraint handling and the solving, have been discussed explicitly. The analytical method and result will conduce to improve the structure design of this kind of machine and the similar devices.

Abstract: Coverage has recently emerged as a premier research topic. More and more research focused on coverage in wireless sensor networks using Voronoi. While most existing research efforts in the area of wireless sensor networks have focused on networks with nodes which have the same capabilities. But for Heterogeneous Wireless Sensor Networks (HWSN), which is more universal, there is a lack of study for using Voronoi solves the problem of coverage. In this paper we address on X-Voronoi for solve coverage in heterogeneous networks. Simulations confirm that the X-Voronoi is able to solve the problem of analyzing coverage performance in heterogeneous networks. To our knowledge, this is the first study on Voronoi for Heterogeneous Wireless Sensor Networks.

Abstract: In this paper, the study for the bonding tool position of ultrasonic transducers for thermosonic Flip-Chip LED bonding is presented. Improving the efficiency of ultrasonic transducers plays an important role in the bonding process. To obtain the actual movement of ultrasonic transducer, finite element method ATILA was employed to get more detailed information. To verify the reliability of simulation results, the impedance characteristic and resonance frequency of the transducer mechanical system have been measured using a LCR meter. Moreover, different mounting position of bonding tool on the transducer was studied. Use ATILA to find the best tool position, and vibration amplitude of the tool was measured by Laser Doppeler Vibrometer. Experimental bonding results are verified by in-house shear force test bed.