Advanced Materials Research Vols. 562-564

Abstract: The stable linear switched systems will converge to the balance Point. If different switched laws be chosen, the convergence Process will not be the same, so there is an optimal switched law. The issues of optimal switched law based on norm, convergence radius, convergence distance and convergence direction are respectively studied, and the optimal switched law is confirmed by solution of matrix equation. All kinds of instance have been considered synthetically, the synthetic optimal switched law is given, by which an optimal status of system in convergence process is reflected roundly. By calculate and simulation of practice examples and the using process of stability criterion is realized distinctly.

Abstract: In order to improve the efficiency of fire and reduce losses of life and property, in this paper,wireless sensor network is applicated in the fire and rescue. Wireless communication module chip is chipcon cc2430.Using temperature sensor and measuring pulse sensor,the data information of the temperature and pulse hops of person is transmitted to the terminal management system by wirelessly.Convenient the external person of scene command the fire scene.Practice shows that wireless sensor networks based on-line monitoring system firemen are great market potential.

Abstract: For effective routing in wireless sensor networks many routing protocols have been implemented. However, transmission of data requires both energy and QoS efficient routing in order to ensure efficient usage of the sensors and effective access to the gathered measurements. An energy-efficient QoS routing algorithm for sensor networks is proposed which can also run efficiently with best-effort traffic. The algorithm finds a least-cost, delay-constrained path for realtime data in terms of link cost that captures nodes’ energy reserve, transmission energy, error rate and other communication parameters. Moreover, the throughput for non-real-time data is maximized by adjusting the service rate for both real-time and non-real-time data at the sensor nodes by using two different calculation. Simulation results have demonstrated the effectiveness of our approach for different metrics.

Abstract: The data transfer of wireless sensor network (WSN) can not be separated with routing protocol, Energy efficiency is one of the most important factors in wireless sensor networks. In this paper based on the uneven distribution of the LEACH cluster head and the different lengths and base station communications, we present a improved LEACH algorithm which refers to remaining energy and optimal cluster heads. Computer simulation using NS2 reveals that the proposed protocol reduces the energy consumption compared with the existing LEACH protocol.

Abstract: In view of the detection of moving object in video sequence, the traditional moving object detection algorithms are researched. The paper presents a new algorithm for object detection based on initial contour and improved variational GAC model. First, this method built up background model utilizing Gaussian mixture model and background subtraction to extract initial contour of the object; taking initial contour as initial value of curve evolution. Then, an improved restriction item is introduced into variational GAC vector model, the proposed restriction item that is a nonlinear hear equation with normalized diffusion rate, therefore re-initialization procedure of level set function is completely eliminated. Iteration number of curve evolution and run time is reduced. The experimental show that accurate contour of moving object is got and this algorithm is effective and feasible in real video environment.

Abstract: Main engine remote control system of modern ship with unattended engine room is vital for the navigational safety , through a starting trouble of the AUTOCHIEF-IV remote control system, analyzes the air starting process of the system from the “Local”“Bridge”“Engine Control Room”position ， identify the trouble reason and solve the fault, put forward the daily work of the special note, provide for work personnel to valuable reference.

Abstract: A new type of tire testing machine is put forward. Various road surfaces can be imitated by this machine. The highest speed per hour is 250kM/h. Through finite element analysis the frame of the machine satisfy the design requirements in the aspect of strength and flexibility. Dynamics analysis demonstrate that the frame's natural frequencys are more than 90Hz. In this way covibration can be avoided effectively. The each rank amplitude are less than 10μm, this value is within allowed band.

Abstract: For the purpose of reducing product structure levels and shorting transfer chain of parameter, in this paper the product structure levels are expressed with generalized modular. The concept of directed graph of parameter connection structure for generalized modular is proposed with the use of directed graph theory, generalized modular, sub-modular and part represented by vertex, the driven relations of parameter connection represented by directed edge, and the properties of directed graph of parameter connection structure for generalized modular are gained. The directed graph of parameter connection structure for generalized modular is divided into a number of sub-graphs according to the relations of product-level modular structure. And the horizontal edges of sub-graphs among vertexes are decomposed. Therefore, a standardized relation of parameter connection structure is established by given the decomposition algorithm and the mathematical description of parameters connection that are provide the theoretical basis for parameters connection analysis of variant design.

Abstract: In order to research contact force between mechanical components of the multi-deformable assembly and product’s reliability, this paper explored the non-linear contact problems by employing the contact mechanics and the finite element method. On the basis of the Lagrange multiplier algorithm, taking multi-deformable assembly as a system, the finite element method is utilized in this paper to analyze the contact cases among deformable components in various conditions, the distribution rules of contact force, the distribution rules of stress and the deformation, with the purpose of figuring out the weakness regions and their solutions.

Abstract: The equation for the recovered spectrum is derived in spatially modulated interferometric imagers, which takes into account the pixel photosensor width. The results show that the effect of the pixel photosensor width on the recovered spectral intensity is related to the wavenumber and the intensity of the incident spectrum, which causes the broadband spectral waveform changed, and the distortion increases with the spectral bandwidth increasing. A mathematical algorithm is given to correct the distortion, and the experimental results show this method is effective.