6results about How to "Smooth speed change" patented technology

The application improves a variable frequency fan natural wind simulation method based on algorithm control, solves the problems of current variable frequency fan natural wind simulation, such as non-complete randomness, existence of partial periodicity and still predictable, large random error, and thus reduces user experience, the method comprises the following steps: determining a natural wind basic wind speed; selecting a certain segment of simulated natural wind duration length; selecting a pulse wind speed reference value, calculating a pulse wind speed; judging and calculating the simulated natural wind speed in this segment of time; judging whether to return to the step according to the relationship between the control duration and the selected simulated natural wind duration, the application uses a single-chip microcomputer to control the fan speed, uses an algorithm to simulate the natural wind, changes the fan speed through continuous circulation and reciprocation to realize the simulation of the natural wind, simultaneously applies a first-order low-pass filter, the speed change is more smooth, and the service life of the machine body is also protected, and the application has the advantages of intelligence, high efficiency, and strengthened user comfort, etc.

The application discloses a model-based mode switching combined control method for a shaft fan variable cycle engine. Firstly, a constant rotating speed control is carried out on a low-pressure output shaft of an external rotor, a low-pressure rotor rotating speed cascade controller is designed, and parameters of the cascade controller in the mode switching process are on-line set through a fuzzy theory. Secondly, through analysis of the relationship between the residual power of the low-pressure shaft and the rotating difference and the compressor surge margin in the mode switching process, a closed-loop controller for an internal connotation nozzle area is designed to compensate the output power of the low-pressure shaft and reduce the engine thrust; in order to inhibit the disturbance caused by the clutch engagement / disengagement and the pitch angle change in the mode switching process, a nozzle area pre-opening strategy and a pitch angle feedforward are introduced, and the surge margin of the low-pressure compressor in the mode switching process is improved through bleeding regulation. The application can provide a technical reference for the engineering development of a new generation of high-speed long-range helicopter power device in China.

The utility model discloses a large-scale articulated bus road energy harvesting system, relates to the technical field of energy collection, and aims to solve the technical problem that a road energy harvesting system using vehicle vibration energy is urgently required to be developed in the prior art to generate power and supply power to road sensing equipment. The system comprises an input module, a conversion module and a power generation module which are connected in sequence. The input module comprises a fixing frame connected with a guide mechanism, the guide mechanism makes contact with a vehicle and receives vibration of the vehicle, an elastic energy storage device arranged between the fixing frame and the guide mechanism is arranged on the guide mechanism, and the guide mechanism is connected with the conversion module through a first connecting device. The conversion module comprises a rotating mechanism, the rotating mechanism converts linear motion of the guide mechanism into rotating motion, and the rotating mechanism is connected with a power generation module which performs electromagnetic induction power generation through rotation. The input module, the conversion module and the like are adopted, mechanical energy of vehicle vibration is converted into electric energy, energy is effectively converted and utilized, and energy conversion and utilization efficiency is improved.

The application discloses a kind of based on improved model predictive control unmanned ship trajectory tracking control method and device.The method includes, H-PINN method is introduced into unmanned ship hydrodynamics model, obtains the simplified hydrodynamics model of unmanned ship;Based on the prediction model of the trajectory tracking of unmanned ship obtained in simplified hydrodynamics model, the expected trajectory and control quantity of model predictive control MPC are designed using differential flatness theory, and stability analysis is designed according to Lyapunov function.The method improves model predictive control using differential flatness theory, and Lyapunov function optimization analysis is combined, improves trajectory tracking precision, reduces the change amplitude of control quantity, so that the speed change in navigation process is more smooth.

A control method for slow variable-power start-up of a scraper conveyor includes: controlling the start-up of the motors at the head and tail of the scraper conveyor in four stages: In the first stage, the conveyor starts from zero speed and accelerates uniformly until the output torque of the head motor reaches a first torque threshold, at which point it enters the second stage; in the second stage, the conveyor moves at a uniform speed at the speed at which it entered the second stage, until the chain tension reaches a tension threshold, at which point it enters the third stage; in the third stage, the conveyor uses the speed at which it entered the third stage as the initial speed, gradually increasing acceleration, and then gradually decreasing acceleration until the output torque of the head motor reaches a second torque threshold, at which point it enters the fourth stage; and in the fourth stage, the conveyor moves at a uniform speed at the speed at which it entered the fourth stage. This method can reduce the number of chain tension peaks and the vibration frequency.

This utility model discloses an optimization device for an automatic reciprocating control system of a high-speed wire rod winding trolley, belonging to the field of high-speed wire rod production technology. This optimization device includes a support assembly, a mobile trolley body, a control cabinet, and a heat dissipation mechanism. The control cabinet houses the control system body. The heat dissipation mechanism includes a mounting box, the front of which is fixedly connected to the back of the control cabinet. A partition is installed inside the mounting box, and the front of the partition and the inner wall of the mounting box form a storage cavity filled with coolant. Several first heat dissipation fins are installed on the front of the mounting box, extending through the control cabinet into the interior at the end furthest from the mounting box, and extending through the mounting box into the water storage cavity at the other end furthest from the control cabinet. This utility model effectively optimizes heat dissipation and has high practical value.