Applied Mechanics and Materials Vols. 44-47

Abstract: In formation-flying satellite SAR system, especially the satellites are LEO or MEO, Doppler frequency shift of SAR echo has a character of long-range changes and quick time variation. Because of this, imaging with high quality become difficulty. Based on the theories and methods of universal gravitation, the relative positions and velocities between every satellite and the ground detection center can be computed, then the Doppler frequency shift for formation-flying satellite SAR system can be estimated that only need to known the parameters of satellite orbit, the working frequency and the azimuth of antenna of master satellite radar. The simulation results show that by using this method, the scope of Doppler frequency shift can be reduced to a very small range, about two in a thousand compared to original echo.

Abstract: According to the relationships of link lengths in crank-rocker linkages, the effective areas of link lengths for type I, type II and type III of the linkages were analyzed firstly. The relationship between the minimum transmission angles, extreme position angles and the link lengths were derived theoretically and drawn visually as variation trend maps and some conclusions are summarized. The conclusions can be used as guidance for optimal synthesis of crank-rocker linkages.

Abstract: A new optimized highway earthwork allocation model from mass-haul diagram idea is built in this study. A mass-haul diagram is a kind of traditional manual method, but it is visualized and convenient for earthwork allocation. With it, the earth moving operations can be represented as discrete events systems, and an ant colony optimization (ACO) algorithm is developed as a system to be equipped with the model. It was shown that the model developed in this study was effective and could increase earthwork allocation efficiency. The model can compute cut and fill quantities and generate the optimal earthmoving plan automatically.

Abstract: The integrated technology is the main way for the instrument development. The combination of networked collaborative design and multi-objective optimization method, considering the different product design and development of individual fitness degree, to provide the best integrated development for the product solution. The system of Flexible integrated knowledge management was built for networked collaborative design. The system architecture is flexible hub, to support the collaborative development of decision-making and optimal design of innovative integrated development. Innovative multi-objective optimization algorithm also was established based on networked collaborative design. It is realized to obtain fast convergence of the optimal solution set for Knowledge groups. The individual goals, to achieve the optimal design of integrated development, were achieved.

Abstract: A new computer-aided detection (CAD) scheme for detecting lung nodules is proposed in this paper. Firstly, the lung region is segmented from the CT data using adaptive threshold algorithm etc; Secondly, building active contour model to segment and remove lung vessel accurately in the lung region; Next, suspicious nodules are detected and omitted renal vessel is filtered using a selective shape filter; Finally, nodule features are extracted and rule-based classifier is used to distinguish true or false positive nodules. Experiment results indicate that this scheme can help radiologist improve the diagnosis efficiency.

Abstract: To widespread six-dimensional spatial vibration and shock in engineering, a novel device is present in which Hexapod platform is used as the main body and Magneto–rheological(MR) damper is used as a vibration control units installed at six branch chain. But the mathematics model for controlling is very complex because the multi-DOF model is highly coupling. In this paper, owing to the six chain vectors of the Hexapod mechanism are linear independence, which shows every branch of the system can be controlled by independent controlling algorithm. A neutral-fuzzy control algorithm is designed to achieve active vibration control a 2-DOF model. The results indicate that the effect of isolation after active control is obvious comparing passive control.

Abstract: Experimental analysis has been done for vibration and noise found in Walking-beam conveyer. Two possible solutions design have been proposed, which integrate with physical components on the speed control system. Because of the determine frequency of the valve, the only way to reducing the opening rate of the valve is using complex signal, which is not what I expect. My research is finding out how to use a simple signal to do complex speed control on Walking-beam conveyer. Through anglicizing the simulation of above design, select the appropriate system for speed control of the Walking-beam conveyer, which provides a theoretical basis and engineering practice for the electro-hydraulic proportional speed control and equipment in the application of non-ferrous metallurgy equipment.

Abstract: The accuracy and credibility of model is the most important determinant of development of Modeling and Simulation (M&S). There is a desperate need for an immediate practical solution to the problem of VV&A (Validation, Verification and Accreditation) of simulation systems. A discussion and experiment of the relative merits of informal methods and formal methods are provided in this paper. In spite of increasing simulation speed via parallelization, the number of problem cases that can be covered is not highly increased. On the other hand, formal methods have proven to be valuable techniques, but they require detailed specifications of systems and requirements, therefore they are not very accessible in practical simulation systems development. According to the exhaustiveness of formal methods, a Model Driven Architecture (MDA) based simulation VV&A framework guided by model checking is presented in this paper. This framework combines scalability of simulation with exhaustiveness of formal methods in order to get the best of both worlds for simulation model verification. It can provide more confidence in simulation models and increase the use of formal methods in the context of M&S by people that are not trained in formal techniques.

Abstract: This paper analyses the importance of embedding the importance of commercialisation of University’s research in the Engineering education in Malaysia. By conducting courses or program about this commercialization aspects by the engineering faculty, the commercialization process for the university will be sustained in future. The literature so far reviewed shows that engineering education processes have been extensively studied to study the best mechanism and model for engineering education in Malaysia. Aiming to contribute to such literature, we look at the current practice of Engineering Faculties under the Malaysian Research Universities in order to see to what extent aspects of commercialization of university’s research are incorporated in their syllabus. We found that the aspect of the commercialization of university‘s innovation are less exposed to engineering students in Malaysia. This paper suggests that it is vital to incorporate the commercialization of university’s research aspects into the engineering syllabus to develop the culture of entrepreneurship among engineering students which eventually assists the university to commercialize its’research.

Abstract: The objective of data fusion is to be able to draw inferences that may not be feasible with data from a single sensor alone. In this paper, data from three sets of sensors are fused to estimate the defect profile from magnetic flux leakage (MFL) inspection data. The three sensors measure the axial, radial and tangential components of the MFL field. Data is fused at the feature level. Examples of signal features are amplitude, width, etc. A radial basis function network (RBFN) is then employed to map the fused features appropriately to obtain the geometric profile of the defect. The feasibility of the approach is evaluated using the data obtained from the MFL inspection of oil pipes. The results obtained by fusing the axial, radial and tangential components appear to be better than those obtained using the axial and radial component alone.