In the context of smart city development, the managed pressure drilling (MPD) drilling process faces many uncertainties, but the characteristics of the process are complex and require accurate wellbore pressure control. However, this process runs the risk of introducing un-modelled dynamics into the system. To this problem, this paper employs neural network control techniques to construct a dual-network system for throttle pressure control, the design encompasses both the controller and identifier components. The radial basis function (RBF) network and proportional features are connected in parallel in the controller structure, and the RBF network learning algorithm is used to train the identifier structure. The simulation results show that the actual wellbore pressure can quickly track the reference pressure value when the pressure setpoint changes. In addition, the controller based on neural network realises effective control, which enables the system to track the input target quickly and achieve stable convergence.

Signs of sexual assault evident in inquest and post-mortem report

The U.S. Department of Commerce just announced that it will add high tariffs for solar modules imported from China. The Canadian government is also investigating the adoption of similar measures, following recent complaints filed by Ontario-based solar manufacturers. With the solar industry in hypergrowth, it’s not a surprise that these governments are interested in boosting new jobs, protecting their economies, and fostering the solar sector. The problem is that tariffs are a short-sighted approach that actually attack the future of North American solar on its home soil, and likely destroy more jobs than they create.

A flow control valve element has a generally spherical ball. An inlet is formed in the ball. An outlet is also formed in the ball, the outlet opposing the inlet. A hollowed-out portion extends between the inlet and the outlet. A pair of opposing flats are formed in the ball, the flats each having a first flat portion formed in an external portion of the ball and an opposing second flat portion formed in the hollowed-out portion of the ball.