Advanced Materials Research Vol. 422

Abstract: Base on Knothe time function, a new time function was proposed by adding parameter which is approved more accurate in predicting surface subsidence than Knothe funciton. Combing this new time function with section function of surface subsidence basin, a dynamic model is proposed to predict surface subsidence induced by underground mining and a case study based on this model was carried out. The results illustrates this model is more accurate to reflect the dynamic process of surface subsidence

Abstract: In order to achieve real-time interactive movement control of three-dimensional solid model, using ultrasound features to achieve its function; established real-time interactive motion control models of three-dimensional solid model, and through the circuit design, it achieved transmit and receive of ultrasonic, so that it achieves real-time interactive movement control of three-dimensional solid model.

Abstract: With STEP-NC providing a way for seamless integration of the design, manufacturing, and quality control processes, the implementation of in-process measurement in this context has become a necessity for STEP-compliant NC manufacture. In the light of current research and development trends in this field, this paper proposes an approach to on-machine planning for in-process measurement, focusing on touch probing operations. Issues about the measured elements and the probing path planning are mainly addressed, and a prototype system is designed and implemented, which generates probing paths based on the information contained in the STEP-NC part program. The feasibility of the proposed approach is demonstrated with an example STEP-NC file.

Abstract: The descaling technology with high-pressure waterjet is widely used in hotrolling process. Waterjets from descaling nozzles play a crucial role on surface quality of hot-rolling steel billet. Since structure of a nozzle accounts for characteristics of the waterjet produced, nozzle structural data are very important for hotrolling billet descaling. However, some of nozzle structural data can only be obtained through experiment due to machining tolerance generated during the factory production of the nozzle. A set-up investigating descaling nozzles performance was established. Laboratory Virtual Instrumentation Engineering Workbench (LabVIEW) was applied to develop a testing system of the set-up, through which the real-time measurement of descaling nozzle data could be achieved. The testing system included three modules, pressure-flow curve, three-dimensional(3D) platform movement track and jet impact force measurement. All the nozzle structural data and water jet performance could be obtained by means of the modules. A GPZ10-type nozzle used for scale removal was tested. Results obtained were presented and discussed.

Abstract: Extrusion for tractor speed-down gears with big modulus have big distortion resistance , dentiform cavity filled difficulty and the service life of die low etc technology difficult problem , a method dividing the material flow in dentiform cavity of concave model was put forward ,and combining with floating die technology ,working-out extrusion new technics , the experiment results show that this shaped technics is beneficial for improving the corner filled capability and decreasing the shaped load 50% significantly, increasing the service life of die，the finished forging parts needs only a bit turning or grinding on excircle , can get qualified parts and would not harm the fibrous tissue of the teeth, have driven cold precision forging of spur gear with big modulus into practice.

Abstract: Noise identification is one of the most important issues in radar and sonar engineering, in which Kolmogorov–Smirnov (KS) statistic is widely adopted. Although KS statistic is the most reliable method till now, it does not have high precision as people believe. The performance of KS statistic is studied in this work, while an experiment is carried out to show the precision of KS statistic, including both test and recognition. The result could help researchers decreasing error of using KS statistic in the future.

Abstract: A new de-noising algorithm based on Intrinsic Time-scale Decomposition (ITD) is proposed after analyzing the statistical characteristics of additional Gaussian white noise decomposed by ITD. Compared with the Wavelet Threshold De-noising(WTD) and de-noising algorithms based on empirical mode decomposition (EMD), the numerical simulation results show that this algorithm has comparable performance with the de-noising based on EMD and the WTD, and it is no need for spline interpolation, iterative sifting and selection of the wavelet base. It is a new adaptive de-noising algorithm.

Abstract: High-power lasers (>+21dBm), because of their ability to transmit long distance signals, have gradually become the common solution for signal transmission systems including regional cable television, Fiber To The Home (FTTH), and gigabit passive optical networks (GPON). However, if protective design is not implemented at the client-side facility, users may be exposed to health hazards caused by the high-power laser, e.g. direct eye exposure to laser beams. High-power optical adapters with photo-interrupters use metal shutter to prevent direct laser beam exposure to the eyes. They have progressively replaced conventional optical adapters and have entered the market mainstream. Our study uses the elastic-plastic theory together with parametric design to investigate the effect of geometry on the initial photo-interrupter spring-back angle. Once the metal spring-back stabilizes after several attempts of insertion and extraction, the initial springing-back angles are found to be the same as the simulated results. In our study, it is observed that factors including the ratio of the notch width to the total width of the metal shutter plate and the relationship with the boundary conditions have significant influence on the springing-back angle. These can be used as references in design control.

Abstract: The main idea of this paper is recent about the transformation of system actions extracted from the user requirement. The system actions are required before the implementation of reconfigurable automation work system. System actions are selected base on suitability of a process. Later, each system actions are matched with suitable system components to create a set of system specification. This specification is used to implement the automation system for each process. The developments of the automation work systems are limited by some constraints such as number of component used as well as the availability of component in the repository system.

Abstract: A magnetic beads agitation device is given based on electromagnetic MEMS. The micro planar coil which is used for controlling the magnetic beads in the device will generate heat, and the heat will directly affect the reaction droplet’s temperature, even lead the failure of the reactants and enzymes. Against this problem, the mathematical model for temperature field analysis of magnetic beads agitation device is established based on three-dimensional transient heat balance equation, boundary conditions of radiation and convection; and then the finite element model for the magnetic beads agitation device is established; in the end, simulation and calculation of temperature field distribution of the device are done in different load, and the simulation results are coincident with the existing literature’s experimental results ,which verified the correctness of this analysis method.