Applied Mechanics and Materials Vols. 182-183

Abstract: Along with the thorough study on magnetic localization of warship, the research on the accuracy judgment method of the magnetic localization solution is more and more important. Previously there has been big limitation of the statistical magnetic localization judgment method based on the statistical phenomenon in the online magnetic localization, so it is difficult to achieve. For solving the above problem, by the aid of the entire search ability of the genetic algorithm, when the movement parameter of the target warship is unknown and the magnetic probe has the attitude angles, adopted the mentality of “Position calculation will be the captain as unknown variables, positioning to determine the amount of time is known to act as a criterion” , complete the magnetic localization arithmetic method based on the single rotation elliptic sphere magnetic model, it can complete the localization arithmetic and location solution identify efficiently. The computed result indicated the effect is good. The Magnetic location of warship can be divided into two sub-problems: positioning solution and the correctness determine of the positioning solution. There has been many research results of the magnetic location solution in comparison, the research on the accuracy judgment method of the magnetic location solution is not sufficient. In real time, with the online request, there isn’t many algorithms can achieve magnetic calculation and the correctness determine of the positioning solution.

Abstract: In inertial navigation system, gyro is used to measure the angular velocity of carrier relative to inertial space for achieve attitude matrix updated in real time. Gyro difficult to eliminate the error, results in strapdown inertial navigation system precision decrease with time. Star sensor is a high-precision attitude measuring instrument and don’t require any priori information, the attitude date can be provided by star sensor. Thus, gyro is simulated by star sensor in order to improve the precision of strapdown inertial navigation system.

Abstract: By modeling ship motion as two rotations, and modeling tire as spring and damper, the dynamics equation of ship and vehicle multibody system is developed using Lagrange equation. Runge-Kutta numerical method is used to get the solution of dynamics equation. The position of vehicle mass center and force between tire and deck contact are analyze for the safety of lash free design. The changing of position shows the stability of vehicle, and the zero vertical force in one tire shows that in severe conditions lash free design cannot ensure the safety of vehicle.

Abstract: Kingview software combined with the SQL Server database are applied in the data storage of monitoring system of the automatic coating production lines of solar collector tubes. The system can acquisition parameter the critical process parameters on-site in real time, the data after the necessary processing are stored in the database, as well as operations such as tracking of the history of process parameters, alarm queries, generating reports etc. can be realized in the corresponding pages that use the SQL functions contained in the Kingview.

Abstract: This paper presents the Enhanced Bluetree, a mesh topology scheme for Bluetooth scatternet formation. The scatternet formation algorithm includes two phases. In the first phase, a designated node called the root starts to create a tree-shaped topology and in the second phase the tree-shaped topology is converted into a mesh-shaped topology. In addition, a return connection mechanism is introduced in this phase to generate more connection paths among the nodes. The mechanism contains two scatternet topology models including the slave/slave mesh (SSM) model and the master/slave mesh (MSM) model. The SSM Model builds a mesh-shaped topology by interconnecting more leaf nodes. On the other hand, the MSM Model connects additional intermediate nodes to establish the backbone connection in a mesh-shaped topology. Simulation results show that both the SSM and the MSM of an Enhanced Bluetree more effectively improve the network performance than Bluetree by significantly reducing the average path length.

Abstract: A simple and feasible modulation scheme called Continuous Pulse Sequence Width Modulation (CPSWM) is proposed to eliminate the crosstalk among multiple ultrasonic sensors in ultrasonic life location system. To improve the performance of multi-life location system (i.e. sharp autocorrelation and flat cross-correlation characteristics), both the continuous pulse sequence (CPS) width and the duration between two CPSs can be modulated using chaotic, pseudorandom or other methods. The duty cycle of each pulse is fixed to be 50%. To adapt to the intrinsic inertia property of ultrasonic transducers, only central work frequency is used in the CPSWM sequence scheme. The CPSWM scheme only uses digital signal generated by a FPGA processor, no D/A converter is used. The experimental results of ultrasonic multi-life location system consisting of two-channel SensComp 600 series electrostatic sensors with the proposed excitation sequences demonstrate that the ultrasonic multi-life location system with the proposed method can realize multi-life location simultaneously.

Abstract: Arsenic is a toxic substance. It will bring detrimental effect to the health, when the arsenic content in water exceeds 10μg /L. For water containing arsenic, we use this control system to remove arsenic to ensure water quality. Arsenic removal in water production is with the characteristics such as time-varying, delay, nonlinear. The system uses a combining control strategy based on fuzzy control and conventional PID control. In the control process, , the precise control and stability can be achieved by online modifying and improving the control rules. The results of experiments show that this method has rapid response, no overshoot and good robustness compared with the traditional controller.

Abstract: There is a very complicated nonlinear relationship between the input digital image pixel value and the display colors, which is difficult to be described by traditional linear methods to achieve high accuracy. In the study, a monitor calibration model is established based on artificial BP neural network theory and by the hue angle range of the experimental data display classification. Because of the good simulation of nonlinear properties of the BP neural network, the calibration model achieves high accuracy. The color error mean value between the chroma value to be displayed and the chroma value driven by the image pixel value which is calculated by the calibration model is rather less than that of the minimum range of the human eye can identify. The calibration model could be used in the gamut matching phrase in the printing color management system, when the monitor is severed as an output device.

Abstract: The influences of the paper properties on ink-jet printing quality are very complex. In order to predict the printing quality quickly and accurately, it is necessary to establish a mathematical model and an evaluation system, based on which we can estimate the paper used for ink-jet printing is suitable or not. In this paper, five kinds of ink-jet papers with different properties were chosen, and the properties including brightness (X₂),gloss(X₃),roughness(X₄),air permeability(X₅) and absorbency(X₆), were tested; then ink-jet printing in the same conditions was carried out and different printing parameters were tested, including solid density(D),dot-gain(DG),print contrast(K)and hue(H). Through combining analysis of each single printing quality parameter with some paper properties by using PCA of SPSS, the correlation functions D/DG/K/H(X2, X3, X4, X5, X6) were obtained. Meanwhile, a comprehensive function Y(D, DG, K, H) involving the printing quality parameters was achieved through synthesis data processing of SPSS. This study shows the influences of paper properties on the printing quality parameters and their corresponding weights, and it also proposes a prediction model of paper printability, which can provide a theory reference for printing work in ink-jet printing.

Abstract: In the current highway design, poor coordinate of the alignment has a great effect on the sight distance which would increase the danger and difficulty of driving. For this reason, safety checking for highway alignment is required by the current standard. In this paper, 3D simulation technique was used to model the real scene of driving. Based on the concept of the preview sight distance (PVSD), two typical coordinates of alignment in practice were discussed. Although the current standard requirement is met, it is demonstrated that the alignment in the location of a minor horizontal curve and combination of a tangent with a circular curve could still provide driver confusing information. Some recommendations were suggested so as to improve the highway alignment design.