3 results about "Pitch rate" patented technology

This invention constructs a sliding mode surface by superimposing the pitch angle error signal, the pitch rate signal, and the nonlinear piecewise integral signal of the error. A second-order nonlinear error coupling filter is then designed to obtain the first-order and second-order output signals of the sliding mode filter. These are then superimposed through error coupling to obtain a hybrid differential signal of the second-order sliding mode surface. By superimposing equivalent control terms and adaptive disturbance estimation terms, the desired value of the main motor armature voltage is calculated using second-order sliding mode control. Then, using an inversion design approach, the desired armature voltage rate signal is gradually obtained by integrating the piecewise coupled pitch angle error signal. Finally, the helicopter pitch control signal is obtained through equivalent voltage and error feedback and inversion calculation, and then sent to the main motor, thus realizing attitude tracking control of the helicopter pitch channel.

A flight control system, flight control rules, and an aircraft are provided. A flight control system includes an input device configured to receive a pitch rate command, a processor operable to receive a pitch angle command, calculate a pitch angle saturation limit, compare a sum of the pitch rate command, a scaled pitch rate, and a scaled pitch angle to the pitch angle saturation limit, convert the pitch rate command system to a pitch angle command system to limit a pilot's pitch up pitch rate command in response to the sum exceeding the pitch angle saturation limit value, and couple the pitch rate command to an aircraft control surface for a failure condition of one of the control surfaces, and the aircraft control surface is configured to adjust the aircraft control surface setting in response to the pitch rate command and / or the pitch angle command to protect the aircraft from a stall condition.

The invention discloses a wind turbine generator control method and system based on dynamic independent variable pitch gain adjustment. The method comprises the steps that S1, operation data of a wind turbine generator are monitored in real time; s2, calculating a generator rotating speed error, a generator rotating speed change rate, a wind speed change rate and a wind direction change rate according to the operation data; s3, judging whether gust working conditions are met or not, and if all gust working conditions are met, setting a gust control trigger flag bit as TRUE; s4, when the trigger flag bit is TRUE, obtaining an independent variable-pitch proportional gain Kp scheduling coefficient according to the product of the rotating speed error and the rotating speed change rate, and finally obtaining an independent variable-pitch additional variable-pitch rate; and S5, outputting a step variable pitch rate signal according to the trigger flag bit, and superposing the independent variable pitch additional variable pitch rate to obtain a comprehensive variable pitch rate instruction so as to execute a variable pitch action. The method has the advantages of cost reduction, efficiency improvement, reliability improvement and the like.