Applied Mechanics and Materials Vols. 271-272

Abstract: Oil source made up of constant pressure variable displacement pump, accumulator, and pipeline is widely used to provide stable pressure for electro-hydraulic control system in practical engineering. The control system is non-linear and real-time, each part of which is interactive, a simulation model of energy source system is built, which includes constant pressure pump, accumulator and pipeline and load by means of AMESim software. Based on the simulation and experiment, the relationship between the load frequency variation and the pressure fluctuation of oil-source are obtained, the research provides support on how to confirm the equipment parameter properly, improve the stability of oil source system and enhance the control precision by reasonable confirming the equipment parameter.

Abstract: This paper focuses on “A shape” frame’s two-cylinder synchronization control of Remotely Operated Vehicle (ROV) launch and recovery system. First, two-cylinder synchronization control scheme with counterbalance valve and proportional valve is proposed. Second, counterbalance valve model is established, and its supercomponent is generated. Finally, simulation of synchronization control system is performed. After adjusting PID controller parameters, displacements error of two cylinders is controlled in the allowed range.

Abstract: The main issue addressed here is that of estimating the kinematic state components of a vehicle in autonomous navigation using landmark angle-only measurements from an onboard passive sensor. The estimates of the absolute position and velocity of the vehicle are provided by a hybrid coordinate fusion filter. The hierarchical architecture of the filter which consists of a group of local processors and a global processor is developed for improving estimation accuracy. In each local processor, an extended Kalman filter uses hybrid information from the reference Cartesian coordinate system and the modified polar coordinate system for state and state error covariance extrapolation and updating. In the global processor, a weighted least squares estimator is utilized to combine the outputs of local processors to form a global estimate. By using only two landmarks simulation results show that proposed algorithm improves the estimation accuracy drastically.

Abstract: Embedded systems become more and more complex, various area was applied the system for their performance. In the contents, system developer and engineer need to analyze the detail system quality attributes when they want to develop their system using embedded system. Therefore it is important work to know accurate quality attributes for embedded system. In this paper, we propose to identify the quality attributes for embedded system. The quality attributes were extracted from the ISO/IEC standard. And we consider their relation between the quality attributes.

Abstract: The instrument of electromagnetic measurement while drilling （EM-WMD）works in the underground environment. In the case of mechanical structure design, sealing is a key problem that needs to be focused. Based on the application of using the traditional design theory to determine the sealing structure and size, finite element analysis is implemented on the rubber O-ring radial seal structure by using the nonlinear finite element software MSC.Marc. The numerical simulation is processed according to different parameters both of axis and axle sleeve gap value and seal groove fillet radius value, and then both of the influence factors of sealing effect are analyzed. Finally , based on this, the relevant seal structure size is optimized.

Abstract: Aiming at the application requirements of this over-speed warning system for preventing the secondary accidents on expressway, this study has conducted certain researches on vehicle speed detection, license plate recognition, and wireless warning techniques. Through settling certain key technologies as over-speed vehicle recognition and license plate recognition based on video tracking, this study would accomplish the portable over-speed warning system model used on expressway and provide technical support for the prevention of secondary accidents on expressway.

Abstract: In order to ensure the safe operation of the tailings pond, and control the occurrences of mine accidents, Strengthening the security research and Establish forecasting model are important. This paper takes dam deformation as the research key, takes the online monitoring as row data, and takes deformation factors as the main line, then uses the method of wavelet neural network, finally establish the prediction model and then analyze. The result shows that this method avoids the concrete form of knowledge representation and has the great nonlinear function approaching capability.

Abstract: Based on LS-SVM pattern recognizer, this paper develops an intelligent method for solving the problem of change-point detection, and the proposed model is applied to detect change-point of process mean-shift in auto-correlated time series process. In this research, LS-SVM algorithm and moving window method are used to detect the location of the mean shift signal, the LS-SVM pattern recognizer is designed and the performance of the recognizer is evaluated in terms of Accuracy Rate. Results of simulation experiment show that the proposed intelligent model is an effective method to detect change-point in ARMA data series.

Abstract: Planning anthropomorphic robot hand for manufacturing waterproof glove, we adopt the geometric modeling method and develop a dexterous robot hand. This robot hand has powerful fingertip force and dexterous motion. This paper presents the design and experiments of this robot hand which has 7 actuated degrees of freedom. Each part of the robot hand has been established the geometric model. For acquiring the powerful force, the finger is driven by tendon, and the driving force from the actuators has been transmitted to the fingers by wire ropes in the arm. The prototype of this robot hand has been developed and tested. This experiment demonstrates that the robot hand can wear the glove efficiently and make accurate gestures which is the user expected. The application of this robot hand in the waterproof glove production line can save the physical labor.

Abstract: Aimed at existing problems on the bending performance of pneumatic bending joint, a new type of pneumatic bending joint is proposed in this paper. Double flexible pneumatic actuators are used as actuating drivers. Based on the first law of thermodynamics and the joint dynamic equation, the angle dynamic model is established and analyzed. Moreover simplified model is proposed. Meanwhile, its dynamic characteristic is analyzed through simulation analysis. The simulation suggests the following results: in the gas-filled phase, the joint’s pressure response time is about 10ms; while it is about 60ms in the gas-escape phase; and the angle response time of joint is 10 to 20ms. When the joint damping coefficient is increasing, this value will also increase.