34 results about "Stability result" patented technology

The invention discloses a dissolved oxygen measurement method and application based on the principle of fluorescence quenching, which belongs to the technical field of dissolved oxygen measurement in water bodies, and comprises the following steps: (1) measuring the phase of the excitation light and the phase of the reference light to obtain the phase difference ( 2) Use the calculation obtained in step (1) to obtain the partial pressure of oxygen Δp; (3) use the obtained Δp to calculate the oxygen saturation S; (4) use the oxygen saturation S obtained in step (3) to calculate the dissolved oxygen Concentration [O2], the dissolved oxygen concentration calculated by the method of the present invention has high accuracy and good stability of the result.

The invention discloses an aircraft holder stability testing device and an aircraft holder stability testing method based on a digital camera. A fixed bracket is arranged on the periphery of an aircraft, the top part of the aircraft is fixed to the lower end of a supporting rod through a universal joint and is positioned at the center of the fixed bracket, an oilcloth is horizontally arranged at the bottom surface of a frame of the fixed bracket, a logo image is arranged on the oilcloth, the digital camera is in rigid connection with a body of the aircraft, and the aircraft and the digital camera are connected with a PC upper computer on the ground through a picture data transmission system; and the digital camera is calibrated firstly, a relation between a pixel position of an image of the digital camera and a logo point position on the oilcloth is established, the fixed bracket and the oilcloth are kept in parallel to the ground horizontally in flight, exterior orientation parameters are obtained through processing picture data acquired in real time, and the stability result of an aircraft holder is obtained through variance calculation. The aircraft holder stability testing device adopts the scientific and effective aircraft holder stability testing method for detection stability of the aircraft holder, is simple and reasonable in structure, high in universality and convenient to disassemble, and can be suitable for various kinds of aircraft holders.

The invention discloses a motor servo system error symbol integral robust adaptive control method comprising the following steps of establishing a motor position servo system model; designing an error symbol integral robust adaptive controller; based on the error symbol integral robust adaptive controller, conducting stability proving of the stability of the motor servo system through utilization of the Lyapunov stability theory; and using the Barbalat lemma to obtain the global asymptotic stability result of the system. According to the invention, an error symbol integral robust adaptive anti-interference controller based on parameter self-adaptation is proposed for the parameter uncertainty and unknown non-linear factors in a motor servo system. The parameter adaptive rate can effectively estimate unknown parameters in the system, and error symbol integral robust terms are adopted to overcome other uncertain nonlinear factors in the system, thereby ensuring the control precision in the motor servo system.

The invention discloses a high-stability dye transferring device which comprises a dye transferring device body. A motor is arranged on the back face of the inner wall of a bottom box which is fixedlyconnected to the bottom of the dye transferring device body, and a moving rod is fixedly connected to the top of the front face of a rotating plate which is fixedly connected to an output end of themotor. By joint use of a motor, the rotating plate, the moving rod, a connection block, a moving plate, a transmission groove, a transmission column, a transmission frame, a slide rod, slide grooves,a transmission rod, a transverse plate and moving grooves, the problem of poor stability resulted from proneness to moving or shaking in use of the dye transferring device due to failure in roller storage is solved, the high-stability dye transferring device has advantages of realization of roller storage and high stability, proneness to moving or shaking in use of the dye transferring device is prevented, pedestrians or users can be protected from injuries, and practicality of the dye transferring device is improved.

The present invention provides a gender recognition method and device based on human face images, wherein the gender recognition method based on human face images includes: obtaining gender recognition results of consecutive N frames of human face images, and the gender recognition results are used to represent the identity of the observed person Gender attribute, N is a natural number greater than 1 and less than the preset number of frames; judge whether the gender recognition results of consecutive N frames of human face images are consistent; when the gender recognition results of the continuous N frames of human face images are consistent, the The gender attribute of the observer is determined as the gender attribute represented by the gender recognition result. In this way, the selected number of image frames is smaller than the number of image frames selected by the average method when obtaining consecutive N frames of human face images with consistent gender recognition results, so as to improve the recognition rate. And the stable result can be expressed by the power of the recognition accuracy of a single frame face image under the number of selected image frames, so when the number of selected image frames is small, a higher stable result can be obtained, that is, a relatively stable gender recognition result.