7results about How to "Accurate control precision" patented technology

The present invention discloses a wind turbine pitch control system, which relates to the technical field of wind power generation, and in particular to a wind turbine pitch control system. The device includes a pitch hydraulic system, a controller, a calibration switch, a calibration block, a grating encoder, and a three-position four-way solenoid valve. The pitch control system controls the pitch hydraulic system actuator through the three-position four-way valve to achieve pitch action. The pitch control system is also provided with a grating encoder, which is used to collect pitch rotation angle information. The grating encoder has a high density of collected rotation signals and a high collection accuracy, thereby achieving more accurate control accuracy. The calibration switch is used to determine a predetermined position to prevent abnormal conditions such as controller reset, temporary freeze, or interference between the grating encoder and the controller during signal transmission, thereby causing the absolute angle obtained by the controller to be inaccurate.

The application discloses a seismic data storage method, a reading method, a storage device and a reading device, wherein the storage method comprises the following steps: determining a precision mode used for storing seismic data according to user demand; determining metadata used for describing the seismic data according to the precision mode; wherein the metadata comprises a global scale factor, a precision level factor, a sampling point number factor and a data format factor; determining a storage format of the seismic data according to the precision mode; wherein the number of bits occupied by the mantissa of the storage format corresponding to each precision mode is different; writing the metadata into the header of a seismic data file; and writing the seismic data into a seismic trace set of the seismic data file according to the storage format. The storage method can not only reduce the consumption of storage space, but also ensure the integrity and accuracy of the seismic data within the precision requirement range.

The invention discloses an intelligent universal umbrella fatigue testing machine and a detection method thereof. The fatigue testing machine comprises a rack, comprising an opening and closing mechanism mounted in the middle of a rack; comprising a compressed umbrella rod force measuring mechanism which is installed at the upper end of a rack; comprising an opening and closing stroke measuring mechanism which is installed at the bottom end of a rack and fixedly connected with an opening and closing machine; comprising a parachute opening and closing force measuring mechanism which is installed in the middle of the rack and arranged on one side of the opening and closing mechanism. The detection method comprises an umbrella fatigue test method for a manual umbrella to be detected and an umbrella fatigue test method for an automatic umbrella to be detected. The adaptive capacity of the device to detection of various umbrellas enables the device to be wide in application range and higher in value, and driving devices for clamping an umbrella sliding sleeve, pressing an umbrella switch button, fixing an umbrella top, compressing an umbrella rod and the like all adopt a motor driving mode, so that the whole control precision of the device is more accurate, and the device is more suitable for popularization and application. The speed and the stroke are more convenient to adjust.

The application discloses an antenna and antenna cover electric performance interval analysis method based on support function summation, relates to the technical field of radar antennas, and comprises the following steps: acquiring the nominal complex excitation of each array element of the antenna and the amplitude and phase interval of the excitation of each array element; obtaining the amplitude and phase interval of the equivalent transmission coefficient of each grid; constructing a general far-field interval model about the far-field complex value of each observation direction of the antenna and the antenna cover, and obtaining the uncertain far-field contribution of each unit in each observation direction; obtaining the first far-field amplitude upper and lower bounds in each observation direction; determining the second far-field amplitude upper and lower bounds in each observation direction; constructing an error index based on the first far-field amplitude upper and lower bounds and the second far-field amplitude upper and lower bounds in each observation direction, and judging whether the second far-field amplitude upper and lower bounds meet the accuracy requirement based on the error index and a preset accuracy threshold; and if yes, outputting a directional diagram interval and an electric performance index interval. The scheme improves the analysis efficiency.

This utility model discloses a rice cooker temperature detection device, relating to the field of rice cooker temperature detection technology, including a temperature sensor, a rice cooker lid, and a rice cooker ECU. This utility model uses a temperature sensor sealed to the lid, with the sensor probe extending into the pot. After being sealed to the lid by a sealing ring, the internal temperature is not leaked out, ensuring a small error between the temperature detected by the sensor and the actual temperature inside the pot. The sensor probe is a high-precision NTC thermistor, encased in a high-efficiency stainless steel probe shell. A shell fixing plate is provided on the probe shell to fix it to the rice cooker lid, ensuring accurate positioning of the temperature sensor probe. The other end is connected to the rice cooker ECU via a wiring harness connector, feeding back the temperature detected by the sensor probe to the ECU. The ECU then instructs the thermostat to adjust the internal temperature of the rice cooker during operation, facilitating precise control of the internal temperature, improving the fluffiness and texture of the rice.

The application relates to a positioning and mounting method of a continuous casting machine casting nozzle, which comprises the following steps: S1, centering adjustment device setting; S2, positioning device setting; S3, box body mounting and adjustment; S4, substitute module mounting; S5, refractory one-time pouring; S6, nozzle plate mounting; S7, refractory secondary pouring; the application takes the positioning device as a positioning reference, aligns the long side of the cross-shaped groove in the middle of the positioning device with the transverse center line of the continuous casting machine, aligns the short side of the cross-shaped groove in the middle of the positioning device with the casting flow center line of the continuous casting machine, adjusts the horizontal position of the box body through a horizontal jackscrew device, makes the position of the box body meet the accuracy requirement of the positioning device, carries out one-time pouring layer construction and preliminary positioning of the nozzle plate through the substitute module, and then accurately controls the accuracy of the nozzle plate and the positioning device through the cross-shaped scale, so that high-precision positioning of the box body, the nozzle plate and the control line of the continuous casting machine is finally realized.

The invention belongs to the technical field of electrical and automatic control and mechanical equipment, and particularly relates to a converter feeding anti-mixing device and method.According to the converter feeding anti-mixing device and method, a control system monitors the real-time position information of a lifting pipe in the horizontal direction and the relative position information of a material distribution opening on a Gray bus according to a code reader, and the real-time position information of the lifting pipe in the horizontal direction and the relative position information of the material distribution opening on the Gray bus are obtained; the control module is used for controlling the movement of the distribution trolley and the start and stop of the lifting driving module, so that the lifting pipe is aligned with the axis of the distribution opening, and the control module is used for controlling the start and stop of the lifting driving module after the lifting pipe is aligned with the axis of the distribution opening, so that the lifting pipe is pulled out of the distribution opening after distribution is completed without influencing the movement of the distribution trolley; and it is ensured that the lifting pipe is effectively inserted into the material distribution opening before material distribution, and material mixing caused by the fact that materials fall outside the material distribution opening during discharging is avoided. Moreover, the control system controls start and stop of the feeding belt according to the position information, monitored by the position detection module, of the lifting pipe in the vertical direction, material mixing caused by the fact that the lifting pipe does not enter a material distribution opening to extract and feed materials is avoided, and meanwhile the material distribution precision is accurately controlled.