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Articles by G. Yan
Total Records ( 3 ) for G. Yan
  G. Yan and Y. Gu
  Due to the advantages of the flexibility and economics in exploration and production of offshore liquefied natural gas (LNG), the floating production storage and offloading unit for liquefied natural gas (LNG-FPSO) has attracted wide attentions in recent years. The offloading system for LNG transportation from LNG-FPSO to LNG carrier is one of the most important parts in LNG-FPSO. The influences of the main parameters such as the mass flow rate and the height difference of the pipeline. on the performance of LNG offloading in offshore associated gas fields were investigated. A model based on a typical offshore LNG offloading system was first established and simulations were conducted. The governing equations were then used to evaluate the effects of parameters together with the simulation results. It was found that there was an economic mass flow rate for practical design on balance of the cost in pump head and BOG. The height difference of the pipeline must be considered for the increase of required pump head and harms from pressure changes. The effects of other parameters on the performance of LNG transportation such as diameter, equivalent roughness of pipeline and LNG compositions were also discussed.
  H. Li and G. Yan
  To portably monitor the motility of the total GI tract, a method for assessing GI motility by simultaneously measuring transit time and contraction frequency is put forward. The portable monitoring system is composed of a swallowable telemetric capsule, a portable recorder, magnetizing coils deposited in vitro, and workstation for data processing. The transit time and contraction frequency of the GI tract are deduced by analysing the variation of the position and orientation angles of a telemetric capsule in time domain and frequency domain. AC electromagnetic localization method is used to determine the position and orientation of the telemetric capsule in vivo. In the paper, the localization model based on a quasi-static magnetic field, the method of monitoring GI motility and the set-up of the monitoring system are detailed. Then from static and dynamic experiments, the performances of the system including the accuracy and dynamic response are evaluated. Finally, the electromagnetic safety of the system is verified by simulating electromagnetic radiation to the human body.
  P. Zan , G. Yan and B. Huang
  A three degrees-of-freedom inchworm-type robot is presented for miniature endoscope inspection in the human respiratory system. The robot is actuated with pneumatic artificial muscle and clamped by two air chambers. The robot`s extra resistance in the human trachea is analysed in detail and the dynamic model of the robot is built. In order to solve the problems of low stiffness and the nonlinear movement characteristic of the pneumatic robotic system, a fuzzy wavelet neural network controller is proposed to control the robot position servo system using the principle of pulse width modulation. Simulation and experimental results both demonstrate that the training of the fuzzy wavelet neural network controller is faster and the control quality is effectively improved. The monitoring experiments had been done in a swine trachea during mechanical ventilation, and the miniature system can dynamically measure respiratory parameters.
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