68results about How to "Reduce output error" patented technology

The invention relates to a system debug method of a movable type direct current ice melting apparatus based on a gate turn-off (GTO) device. The method comprises the following steps: (1) a direct current ice melting apparatus carries out a low voltage signal test without an ice melting line; (2) the direct current ice melting apparatus carries out a zero load test without the ice melting line; (3) the direct current ice melting apparatus carries out an undercurrent test without the ice melting line; (4) the direct current ice melting apparatus carries out heavy current test and ice melting load line temperature rise test. Thereby, the invention can guarantee that the system debug can examine the performance of the apparatus. The system debug method provided in the invention is reliable and feasible.

The invention discloses a method for calibrating the combination of a strapdown inertial combination gyroscope. The method comprises the steps of after the scale factor and the installation error angle of the combination of the gyroscope are known, carrying out significance analysis on the quadratic term coefficient in an error model without a zero order term by sequentially measuring the output values of the strapdown inertial combination at eighteen positions to obtain an actual error model of the gyroscope related to apparent acceleration; calculating all coefficient values in the error model by a calculation formula. Compared with other error coefficient calibration methods, the method can be used for obtaining the error term model of the gyroscope related to apparent acceleration within three coordinate axes of the strapdown inertial combination, and calibrating the error terms of the combination of the gyroscope related to apparent acceleration, thus improving the degree of accuracy of the error model; furthermore, the calibrating process is simple and the needed time is short.

The invention provides a variable arm articulated coordinate measuring machine provided with a magneto-electric locking arm apparatus. The variable arm articulated coordinate measuring machine comprises fix rotatable joints, three segments of measuring arms, a base and a gauge head. The six rotatable joints connected in series through the three segments of the measuring arms form a space open chain structure, and the tail end of the open chain structure is the gauge head of the measuring machine. From the base, a first-order joint and a second-order joint are internally provided with joint locking assemblies, and the joint locking assemblies are electromagnetic joint lock assemblies. According to the invention, in the joint locking assemblies of the articulated coordinate measuring machine based on an electromagnetic technology, additional arrangement of machinery structures is unnecessary, no influences are exerted on the mechanical distribution of the measuring machine, after the joints are locked, the number of sensors for dynamic output is reduced, the rotation of an angle sensor is restricted, the output errors of the angle sensor are reduced, and the measuring precision is improved.

The invention provides a variable arm articulated coordinate measuring machine provided with a magneto-electric locking arm apparatus. The variable arm articulated coordinate measuring machine comprises fix rotatable joints, three segments of measuring arms, a base and a gauge head. The six rotatable joints connected in series through the three segments of the measuring arms form a space open chain structure, and the tail end of the open chain structure is the gauge head of the measuring machine. From the base, a first-order joint and a second-order joint are internally provided with joint locking assemblies, and the joint locking assemblies are electromagnetic joint lock assemblies. According to the invention, in the joint locking assemblies of the articulated coordinate measuring machine based on an electromagnetic technology, additional arrangement of machinery structures is unnecessary, no influences are exerted on the mechanical distribution of the measuring machine, after the joints are locked, the number of sensors for dynamic output is reduced, the rotation of an angle sensor is restricted, the output errors of the angle sensor are reduced, and the measuring precision is improved.

The invention makes a request of protection of an H-plane-fracture-waveguide terahertz directional coupler and relates to a terahertz circuit unit assembly. A core coupling region of the coupler is formed by two one-quarter-circular-ring rectangular waveguides; one waveguide serves as a main waveguide and the other waveguide serves as an auxiliary waveguide; and the two waveguides are intersectedat the middle position of one side of a narrow edge to form a fracture with an H-plane waveguide. Specially-shaped bending structures are connected to the two ends of the main waveguide and the auxiliary waveguide, so that a testing device or another device is connected with an input port and an output port of the coupler. The four ports are arranged at the centers of four planes of the square. The coupler that has a simple structure and is implemented conveniently and designed ingeniously has excellent practical performance and is improved well; and thus the couple is suitable for large-scalepopularization and application.

The invention makes a request of protection of an H-plane-fracture-waveguide terahertz directional coupler and relates to a terahertz circuit unit assembly. A core coupling region of the coupler is formed by two one-quarter-circular-ring rectangular waveguides; one waveguide serves as a main waveguide and the other waveguide serves as an auxiliary waveguide; and the two waveguides are intersectedat the middle position of one side of a narrow edge to form a fracture with an H-plane waveguide. Specially-shaped bending structures are connected to the two ends of the main waveguide and the auxiliary waveguide, so that a testing device or another device is connected with an input port and an output port of the coupler. The four ports are arranged at the centers of four planes of the square. The coupler that has a simple structure and is implemented conveniently and designed ingeniously has excellent practical performance and is improved well; and thus the couple is suitable for large-scalepopularization and application.

The invention provides a high-precision program-controlled direct-current resistance box and a resistance correction method. The high-precision program-controlled direct-current resistance box comprises a controller, a keyboard module, a display module, a resistance network module and a motion control module; the keyboard module is connected with the input end of the controller, the keyboard inputmodule is provided with a keyboard, and the keyboard is used for inputting a resistance value; the display module is connected with the output end of the controller, and the display module is provided with a display screen; the resistance network module is provided with at least one rotary rheostat , and a rotary rheostat is provided with an adjusting rotary handle; the motion control module is connected with the controller, the motion control module is connected with motors, the number of the motors is the same as that of the rotary rheostats in the resistance network module, and the motorsare in transmission connection with the adjusting rotary handle; the resistance value can be adjusted instead of manual work, the adjusting speed is high, the accuracy is high, and the use efficiencyis improved; according to the resistance correction method, the output error of the resistance box can be reduced, and the precision of the resistance box is improved.

The invention discloses a nitrogen oxide sensor controller. The nitrogen oxide sensor controller comprises a heater resistance measuring circuit, a micro-control unit, a heating driving circuit, a first pump current detection circuit, a second pump current detection circuit, a third pump current detection circuit, a first pump voltage control circuit, a second pump voltage control circuit and a third pump voltage control circuit. The sensor heater resistance is measured by the heater resistance measuring circuit, and the control and the detection of pumps are achieved by the three independentpump voltage control circuits and the three independent pump current detection circuits. A microcontroller conducts operation treatment on acquired heater resistance signals and acquired pump currentdetection signals, and heating control signals, pump voltage control signals, output oxygen concentration signals and nitrogen oxide concentration signals are obtained. By the adoption of the nitrogenoxide sensor controller, the accurate measurement of the heater resistance of a nitrogen oxide sensor is achieved, the temperature control accuracy of the sensor is improved, the control over pump units of the nitrogen oxide sensor and the accurate measurement of the pump current signals are achieved on this basis, and the accuracy of detection conducted by the nitrogen oxide sensor on the concentration of oxygen and the concentration of the nitrogen oxide in the automobile exhaust gas is improved.