Applied Mechanics and Materials Vols. 55-57

Abstract: This model has the advantage of solving the sensor coverage problems with complex target types. In this paper, we analyze the problem of Clifford connected partial Hybrid-type target coverage where cover sets are allowed to monitor a subset of the Hybrid-type targets at any point in time, while Clifford connectivity with the base station is retained. We analyzed the Clifford connection Partial target coverage, and proposed an algorithm--- CSNCPCCA on the basis of the Clifford connecting partial Hybrid-type coverage model of Clifford sensor network. At the same time the deployment of the sensor network achieves full coverage and connectivity among working nodes. Finally, we tested and verified the rationality of the model and the algorithm with actual data.

Abstract: Dent is one of the important factors affecting pipeline fatigue life, and it will greatly reduce the fatigue life of the pipeline in service. And the peak cycle stress on the dented pipeline is the key parameter to calculate pipeline fatigue life. For typical II type dent in the pipeline, the finite element models are established under different circumstances. A large number of the calculation results are sorted, inducted, drew. On this basis, the results are analysed by univariate and multivariate. Non-linear regression analysis was utilized to fit the results by matlab, some specific expressions of the relationship between the dented pipeline peak cycle stresses and the dent depth, diameter and thickness of pipeline, and the dent longitudinal length are obtained after much calculation and analog.

Abstract: The deformation resistance were researched during the projectile sabot impinging on the conic-chamber at a high speed in the interior ballistics phases . The calculational modeling of interior ballistics was set up based on the special structre of conic-chamber and projectile. The p-l curve, v-l curve and v-t curve were obtained with modeling by MATLAB. These curves were similar to those calculated with the correction subordinate method. And the results were coinsident with the experiment results. which proves the method to be feasible.

Abstract: In order to study the fractal character of representative complex exponential function just as generalized 3x+1 function T(x). In this essay, we proved that T(x) has periodic points of every period in bound (n, n+1) when n>1 in real axis. Then, we found the distribution of 2-periods points of T(x) in real axis. We put forward the bottom bound of 2-periodic point’s number and proved it. Moreover, we found the number of T(x)’s 2-periodic points in different bounds to validate our conclusion. Then, we extended the conclusion to i-periods points and find similar conclusion. Finally, we proved there exist endless convergence and divergence points of T(x) in real axis.

Abstract: In this investigation, we focus on three most frequently applied badminton footwork and analyze relations among the features of intensity of pressure, distribution of pressure, and the mean maximum pressure during the movements in order to improve technique and give available suggestions on footwear design and lower-extremity injury prevention. All subjects (N=10) performed three typical footwork movements: Left Front-court Lunge Steps (LFLS), Right Front-court Lunge Steps (RFLS), and Rear-court Revolve to Jump (RRJ) with the peak pressure and distribution of pressure collected by Medilogic insole measurement (300Hz) simultaneously. Due to the characteristics of footwork, the whole period was subdivided into two phases to be analyzed: toe-off (TO) and touch-down (TD). The results indicated that the metatarsal heads and lateral of heel proved to be the most contacting regions with the surface. Therefore, different areas of outsole should be designed with different materials respectively so as to disperse pressures. Stability for rear foot and ankle joint should be enhanced in terms with the shoe design in order to prevent potential lower-extremity injuries.

Abstract: With the rapid development and extensive application of network technology, the concept of IOT (Internet of Things) is coming into view. Through information sensing device, according to the agreed protocol, IOT can connect anything to the Internet and to achieve the exchange of information and intelligence management. This paper elaborates the core technologies of the IOT, describes the application of IOT, analyzes the three major issues of IOT development constraints, and makes a few comments to promote the development of IOT.

Abstract: In order to reasonably reduce the cost of project, and reduce the duration of project, the engineering project time–cost must be optimized. The paper concludes the project time - cost optimal solution, by establishing programming model of project time–cost nonlinear relation, and using particle swarm optimization algorithm to achieve progress optimization. And using an example shows that this optimization method is the feasibility and practicability in solving engineering project time–cost of nonlinear optimization.

Abstract: Due to the complex motion control in flexible roll forming when processing the sheet metal with variable cross-section, it is required for high real-time and high precision control during the processing. Controlling servo motor by adopting the configuration programming is a common approach to achieve roller motion, but it will not be able or difficult to realize by the configuration programming for complex contour sheet metal without the rules such as hyperbolic, or the molding product in non-symmetric cross-section shape, etc. Based on the process characteristic of flexible roll forming and its motion control technology, this paper adopts the variable time-domain discrete interpolation control method to process the variable cross-section sheet metal. Experiments indicate that this control method provides a good operating method for the sheet metal forming with complex variable cross-section shape in flexible roll forming.

Abstract: Process monitoring and fault diagnosis of batch process is a research focus in the industrial control field. In this paper, penicillin fermentation is taken as the research background, a visual batch process simulation system is designed based on mathematical models of an actual production process. By introducing different fault signals to the penicillin fermentation simulation process, the designed system can be used to simulate the real penicillin fermentation production process clearly. In the end, an ideal experimental simulation data for batch process fault diagnosis is provided.

Abstract: To move efficiently in an unknown environment, a mobile robot must use observations taken by various sensors to detect obstacles. This paper describes a new approach to detect obstacles for serpentine robot. It captures the image sequence and analyzed the optical flow modules to estimate the deepness of the scene. This avoids one or higher order differential in the traditional optical flow calculation. The data of ultrasonic sensor and attitude transducer sensor are fused into the algorithm to improve the real-time capability and the robustness. The detecting results are presented by fuzzy diagrams which is concise and convenient. Indoor and outdoor experimental results demonstrate that this method can provide useful and comprehensive environment perception for the robot.