Applied Mechanics and Materials Vols. 687-691

Abstract: Taking the hyperchaos Rossler system as an example and based on the Lyapunov Stabilization Law, with the parameters unknown, through the designing of controller, the synchronization of the driving system and the responding system has been realized by using the nonlinear feedback controlling method. This method provides a convenient way for the synchrocontrol of hyperchaos system, whose effectiveness has been further proved by the numerical simulation experiment.

Abstract: Cavity expansion modeling is an important method for penetration analysis. Based on the Mohr-Coulomb criterion, a quasi-static cylindrical cavity expansion model for the penetration of confined concrete targets was proposed in this paper. Formulas of cavity expansion stresses calculation were obtained and the lateral confinement effects of steel tubes on the cavity expansion stresses were also investigated. Numerical results about the relationships between the ratio of tube wall thickness to tube radius and cavity expansion stresses were discussed.

Abstract: A new and effective analytical perturbation method is presented for the multipole acoustic logging in a transversely isotropic medium (TIM) whose symmetric principal axis is parallel to the borehole axis although the exact solutions could be found. In this paper, the new perturbation method is adopted to simulate the dispersion characteristic in a borehole surrounded by a TIM for the first time. The TIM is regarded as a reference unperturbed isotropic state added to the perturbations, and three perturbation quantities about moduli deviated from the isotropic medium are introduced. By selecting a group of displacement potentials and a cylindrical coordinate system oriented along the borehole axis, the zero-, first-order and second-order perturbation solutions of the multipole acoustic field are derived for the weak transversely isotropic elastic solid which has its symmetric principal axis parallel to the borehole axis. The acoustic fields inside and outside the borehole excited by a multipole source are investigated. The dispersion characteristics in the borehole are numerically simulated by the perturbation method in the range of the second perturbation solutions. It is found that the dispersion characteristic by the perturbation method inside the borehole excited by monopole, dipole sources and quadrupole source are similar to obtained by the exact solution.

Abstract: This paper is to use the method of test of goodness of fit test of hypothesis. By computing the maximum likelihood estimates of income, the results, to test scores of students to obey normal distribution, and confirm by MATLAB.

Abstract: This article in view of the present large complex planee parts due to large size,complicated structure, detection method and technical route problem affecting precision and difficult to achieve part, through the use of advanced portable measuring equipment (Metronor light pen measuring instrument, laser scanner and laser tracker device) and product 3D model information to build a reasonable detection technology platform, in view of the different components of the inspection requirements and purposes, using different method to creat the datum, measurement and the assistant tools of different detection technology route, solved the aircraft large, complex parts, assembly process control and quality control in product processing, the difficulty of assembly accuracy control, not only improves the precision of large parts quality and throughout the aircraft parts manufacturing and assembly process reached the assembly efficiency high assembly quality requirements, meet the requirement of aircraft parts assembly process, for large, complex parts of aircraft digital detection technology to lay the solid foundation, further accelerate the process of the development of the current aircraft digital measurement adied assembly technology, improve the efficiency of product processing, lower the manufacturing cost.

Abstract: As it is impossible to conduct real-time monitoring on slope condition of highways, a remote monitoring system has been specially designed. Making use of GPRS technology, Labview and solar power, the system has realized nobody monitor on slope anchor system, automatic collection of slope pressure and displacement data. It enjoys advantages such as high-accuracy, real-time monitoring and high-reliability. Among existing effective monitoring ways, massive man-power is needed for on-field work, but real-time monitoring is still left to be achieved.

Abstract: First of all, the most important thing in introducing the digitization to the instrumentation and control system of nuclear power plant is its reliability. Then, what needs to do is designing each part of the system combined with the digital characteristic. Only through the system design of redundancy and diversification can the system of instrumentation and control be secure to run.

Abstract: The technologies of wireless mesh network are adopted and a new remote control and communication system for intrinsically safe robot is proposed, which is helpful for rescue and detection in coal mine, not only achieves real-time monitoring of CO, CO₂, CH₄, O₂ and temperature under assumed disaster area, selecting obstacle crossing modes for robot body, remotely sensing the states of motion and walking distance, remotely controlling gas detection and sampling device, monitoring environmental noise/video and other interactive functions. This paper focused on the principle of its architecture, software implementation ways of remote control system and analysis of its data flow. The system has the advantages of superior range for wireless controlling and more visual data than other similar systems, which is verified by experiments and has practical value.

Abstract: The paper puts forward the way to solve the problem of SVM training on the large scale firstly, Then perform the experiment to verify the feasibility of scheme. In the last section, SVM fault diagnosis method based on the Mapreduce is put forward.

Abstract: Characteristics of modern badminton can be summarized as fast, comprehensive and highlighted. In order to organize badminton training scientifically; we must choose convenience and practical methods in monitoring. Heart rate is a reflection of the body and it is a sensitive physiological indicator. It is widely used in sports training thanks to its relevance, timeliness, testability, non-invasiveness and practicality. In this paper, heart rate was recorded during a badminton class. We evaluated the training programs according to the heart rate changes and discussed the application of heart rate monitoring in badminton training.