55results about How to "Less design parameters" patented technology

The invention discloses a nonlinear self-adaption control method of near-space hypersonic vehicle (NHV), which belongs to a flight control method in the technical field of aerospace. The control method mainly comprises three control law parts: a nominal nonlinear generalized predictive control law (NGPC), a B-spline recursive functional linkage network (BRFLN) self-adaption control law, and a robust control law of gain self-adaption adjustment. The invention integrates the simplicity of the NGPC method and the effectiveness of dynamic uncertainty of the BRFLN learning, targets the immeasurable dynamic uncertainty and fast interference of an attitude system in the flight of the NHV, brings favorable learning effect, and realizes the nonlinear accurate control to the attitude angle.

The invention provides a wind turbine pitch variation execution mechanism robust control method based on H-infinity mixed sensitivity. The method comprises the following steps: establishing an open-loop transfer function GP (s) of a pitch variation execution mechanism; establishing a sensitivity function S and a complementary sensitivity function T; establishing weighting functions W1, W2, and W3 meeting constraint conditions; and establishing a closed-loop system transfer function Tzw (s) of a generalized controlled object of the pitch variation execution mechanism, and further obtaining a transfer function K(s) of an H-infinity controller Chinf. According to the method, the H-infinity mixed sensitivity robust control is applied to the wind power generation pitch variation execution mechanism, and an advanced control plan is provided for the pitch variation execution mechanism to carry out rapid and accurate pitch variation command tracking, thereby reducing tracking error, and improving tracking performance, dynamic performance, robust performance and anti-interference capability of the pitch variation execution mechanism.

The invention discloses a heat recovery system with a plurality of stages of hybrid heaters. Specifically, the heat recovery system comprises a BEST machine, five high-pressure heaters, five low-pressure heaters, the two to five hybrid heaters, boosting pumps and a condensate pump; each hybrid heater is configured with the corresponding boosting pump; the condensate pump is positioned between thelow-pressure heaters and a steam condenser; extraction steam of the first high-pressure heater is from a main steam turbine; the extraction steam of the second high-pressure heater to the fifth high-pressure heater is from the BEST machine; steam sources of the hybrid heaters are all from the BEST machine, wherein the steam source of the last stage hybrid heater is from the exhaust steam of the BEST machine; the extraction steam of the five low-pressure heaters is from the main steam turbine; and the last stage hybrid heater is connected with one of the low-pressure heaters, and the water supply of the last stage hybrid heater is from the low-pressure heater. According to the heat recovery system with the plurality of stages of deaerators, the circulating efficiency of the system is improved; the superheat degree of the steam is fully utilized; the project cost is reduced; the cold end loss of the steam is reduced; and the heat recovery system with the multiple stages of deaerators isparticularly suitable for the situation that the steam extracting steam of a plurality of heaters are close to the saturation pressure of the steam, and the feed water flow is large.