30results about How to "Solving Compensation Issues" patented technology

The invention relates to an active disturbance observation-based fuel pressure control method, aims at solving the problems of time-varying characteristics and non-linearity of an internal combustion engine fuel injection system and non-ideal application of traditional PID (proportion integration differentiation) control in fuel pressure control and the like, and provides the method of realizing control on fuel pressure by adopting model-based feedforward control and state observation-based feedback control. The method mainly comprises target fuel pressure computation, fuel pressure sensor practical fuel pressure collection and computation, fuel measuring unit fuel volume flow rate feedback regulation amount computation, fuel measuring unit fuel volume flow rate feedforward control amount computation, conversion of fuel measuring unit fuel volume flow rate into current, conversion of fuel measuring unit current into a PWM (Pulse Width Modulation) duty ratio, fuel measuring unit practical work current measurement and computation, a fuel measuring unit current feedback regulator, fuel measuring unit PWM modulation frequency computation, a fuel measuring unit PWM drive, a fuel measuring unit, a fuel injection system and a fuel pressure active disturbance observer.

The invention provides a method for compensating and enhancing a dynamic shielded image in real time, solves the real-time compensation and enhancement problems of the dynamic shielded image and improves the quality of the dynamic shielded image. The technical proposal comprises the steps of estimating the motion vector between two adjacent images by a moderate method based on a video image output by a camera, combining motion compensation with a time domain Kalman filter technique of a pixel gray value, performing time domain filtering treatment for all pixels so as to compensate the image information of a dynamic shielded area, and finally performing self-adaptive grey widening and edge enhancement treatments for the compensated image.

The invention provides an aeromagnetic compensation method based on a non-linear aeromagnetic total field gradient compensation model. Time series weighting modeling of output of a flux-gate magnetometer is carried out, and a direction cosine of a geomagnetic field and a direction cosine of an airplane, and an aeromagnetic compensation model characteristic matrix are estimated, and thereafter airplane platform magnetic interferences observed by an optical pump magnetometer is predicted to acquire the non-linear aeromagnetic total field gradient compensation model, and then the non-linear aeromagnetic total field gradient compensation model is solved to acquire an aeromagnetic compensation result. By establishing the non-linear aeromagnetic total field gradient compensation model, a compensation problem of an interference magnetic field caused by time delay between data channels is effectively solved, and the precision of the aeromagnetic compensation is greatly improved.

The invention provides a blade vibration detection and fault prediction system for fan. The fan rotates in a circular motion centering on a connecting shaft at a certain rotating speed. The system comprises a fan blade vibration detecting device as a hardware part and a fan fault prediction method as a software part.

The invention provides an overload electrohydraulic executing mechanism drive valve system with a compensation function, and aims to solve the problem that CN101709807 is constrained by a spring and thus cannot be applied to the overload electrohydraulic executing mechanism drive valve system. The key points are that the system comprises a drive oil cylinder, a compensation oil cylinder and a spring, wherein a piston rod of the drive oil cylinder is connected with a valve rod of an overload valve; a piston rod of the compensation oil cylinder is abutted against the spring; the compensation oil cylinder is connected with the drive oil cylinder in parallel. The system has the positive effects that energy is absorbed, stored and released by the spring and the compensation oil cylinder together, the spring is not a unique involved part, the problem of spring constraint is solved, further the application to the overload electrohydraulic executing mechanism drive valve system is realized, and reliable operation of the overload electrohydraulic executing mechanism drive valve system is guaranteed.

The invention discloses a motion sensor temperature drift correction method and system, and an electronic device. The method comprises the steps: step S1, setting a device to be tested, and reading the temperature T0 inside a motion sensor, the acceleration speed and data initial values of six axes of a gyro by an upper computer program; step S2, supplying power to a heating circuit; step S3, recording bias of the six axis data of the motion sensor and the initial values at each temperature point by the upper computer program; step S4, writing the bias value in a memory of the device; and step S5, in the use of the device, according to the current motion sensor temperature, adopting a linear approximation compensation method to compensate the motion sensor data, and thus obtaining more accurate motion sensor data. The motion sensor temperature drift correction method and system provided by the invention can solve the problem of calibration and compensation of the temperature drift of the motion sensor, and have relatively high efficiency and relatively low cost.

The invention relates to a thermocouple thermometer and a test method based on MAX31856, and the latest MAX31856 released by Maxim Company is selected as the thermocouple digital converter. The MAX31856 contains a 19-bit analog-to-digital converter (ADC). The MAX31856 features an internal temperature sensor for automatic thermocouple cold-junction compensation. The MAX31856 has a temperature look-up table that supports thermocouples with different graduation numbers, and the temperature look-up table can perform nonlinear correction on the thermocouple temperature data. The invention solves the problem of thermocouple cold junction compensation and the problem of nonlinear correction of thermocouple temperature measurement. The temperature resolution of the thermometer is 0.0078125°C. Thermocouple voltage measurement accuracy is ±0.15%. The thermometer can be used portablely, and can also be connected to a computer to display data in real time, which greatly facilitates the work of engineering and technical personnel and has certain practical value.

The invention relates to a locking and turning device for a suspension type air rail turnout interface which can fundamentally solve the problem of locking and switching an interface for suspension type air rail turnouts and meets the need for a vehicle to change lines. A power output end of an electric push rod is hinged on one end of a locking pin and drives a cam mechanism to perform linear motion; the cam mechanism drives crank mechanisms to perform rotation having a sequential difference with the locking pin; a hinge four-bar mechanism comprises the crank mechanisms, connecting rod members and turning crank components; and the crank mechanisms drive horizontal locking pins and overturn plates to rotate through the connecting rod members and the turnover mechanism components, thereby realizing horizontal locking of the locking pins and overturn of the horizontal locking pins and the overturn plates. The locking and turning device has the advantages of solving the problem of compensation for a reserved expansion joint of suspension type translation turnouts and the problem of interface locking after switching is in place, so as to realize the continuity of a running surface of avehicle, and achieving the driving of the locking and turning movement through the same power source by adoption of the hinge four-bar mechanism, reducing power supply and improving the reliability of the device.

The invention provides a volume-type fluid mechanism which comprises an eccentric shaft and a working medium moving part, wherein the eccentric shaft comprises a driving shaft and a deflection non-sleeve body; the deflection non-sleeve body is arranged on the rotating shaft of the driving shaft and/or arranged on the eccentric part of the driving shaft; and the working medium moving part sleeves the driving shaft and the deflection non-sleeve body. According to the volume-type fluid mechanism provided by the invention, the compensation problem of the mechanism is effectively solved, the life of the volume-type fluid mechanism is prolonged, the sealing performance of the volume-type fluid mechanism is effectively improved and the efficiency is improved.

The invention discloses a thermal temperature rise compensating method for a numerical-control machine tool. In work of the numerical-control machine tool, a displacement sensor obtains elongation ofa rolling ball lead screw under each motion axis thermal temperature rise state of the numerical-control machine tool, and a corresponding mapping function is established according to a relationship between the elongation and a motion axis displacement error value; and a PMC system of a numerical-control system automatically calculates the error compensation value of each motion axis, and the numerical-control machine tool control system compensates motion axis displacement errors caused by thermal temperature rise. According to the thermal temperature rise compensating method disclosed by theinvention, the elongation of each motion axis lead screw thermal temperature rise is directly obtained by the displacement sensor, so that elongation data errors of rolling ball lead screw temperature rise are small, and precision is high; elongation data of the rolling ball lead screw temperature rise and the motion axis displacement error data are transmitted into the PMC of the numerical-control system to automatically calculate the error compensation value, and therefore, thermal temperature rise compensation precision is effectively improved, and product cost increase amount is smaller than 2%-3%. The method realizes solving the problems that processing precision of numerical-control equipment is reduced, a qualification rate of processed products is low, and the like as motion axispositioning errors are caused by motion axis transmission shaft deformation due to temperature changes with low cost.

The invention provides a compound expansion joint used in the petrochemical field. The compound expansion joint used in the petrochemical field is provided with an intermediate pipe assembly. Heat insulation linings are arranged on the inner wall of the intermediate pipe assembly, and two ends of the intermediate pipe assembly are separately connected to a set of external pressing corrugated pipeassemblies arranged back to back. The external pressing corrugated pipe assemblies comprise end pipes, corrugated pipes, corrugated pipe connection pipes, end ring assemblies, outer pipes, retaining ring assemblies with thermal insulation ceramic fibers, flow-guiding barrel assemblies with wear-resistant linings and dust-proof sealing rings, the corrugated pipes sleeves the end pipes, the heat insulation linings are arranged on the inner walls of the end pipes, one ends of the corrugated pipes are fixedly connected with the ends, close to the direction of an expansion center, of the end pipesthrough the corrugated pipe connection pipes, the other ends of the corrugated pipes are connected with one ends of the outer pipes through end ring assemblies sleeving the end pipes and having gaps with the end pipes, and the other ends of the outer pipes are connected to the intermediate pipe assembly. The compound expansion joint can completely solve the problem of corrosion failure of a cold wall pipeline high temperature expansion joint of a large refining and chemical plant, and the cost of expansion joint is reduced.