34results about How to "Compatible with practical engineering applications" patented technology

The invention provides a risk assessment method for relative values ​​of lightning parameters of distribution network lines, and relates to the technical field of lightning protection for overhead lines of power system distribution networks. This method comprehensively evaluates the risk level of towers in a specific distribution network line by introducing lightning activity parameters such as the relative value of ground flash density and the relative value of lightning current amplitude induced overvoltage, and accurately finds out the towers with a relatively high level of lightning risk in a specific line. Protection is carried out in order to meet the goal of lightning damage control for distribution network lines in different regions.

The invention discloses a disc hobbing cutter box mechanism of a shield tunneling machine and an application method thereof. The disc hobbing cutter box mechanism comprises a box body and a rotation mechanism, wherein a hobbing cutter installing mechanism is arranged in the box body, one side of the hobbing cutter installing mechanism is fixedly connected with a hobbing cutter, and the rotation mechanism is installed on the other side of the hobbing cutter installing mechanism; the rotation mechanism comprises a rotation mechanism installing block and a rotation box installed on the rotation mechanism installing block. A cutter box is simple in structure and easy to machine, and meets strength requirements. The cutter box is structurally integrated and free of any independent small part, and operation by a robot is convenient. When the disc hobbing cutter box mechanism is used in cooperation with a manipulator, torque generated in the rotation process of the rotation mechanism on the cutter box can be transmitted to the box body through mechanical fingers, and a mechanical arm does not need to bear the torque. A bevel arranged on a left baffle and a bevel arranged on a right baffle of the rotation mechanism installing block can prevent the left baffle and the right baffle from getting stuck in the box body. The rotation mechanism is installed behind the hobbing cutter installing mechanism, and the hobbing cutter is prevented from being scratched by falling rock-soil in the rock-soil cutting process.

The invention discloses a design method of a harmonic gear device, and designs the harmonic gear device comprising a rigid gear and a flexible gear and the rigid gear and the flexible gear capable ofrealizing space engagement. The design method comprises the following steps: (1) in a direction perpendicular to the axis of the flexible gear, front, middle and back sections of the flexible gear areselected; (2) a discrete point of a tooth profile of each section of the rigid gear is obtained through an envelope method based on a simulation motion trajectory of the flexible gear; and (3) a complete tooth profile of the rigid gear is obtained according to the obtained discrete points of the tooth profiles of the three sections of the rigid gear. The design method prevents defects in the conjugate profile design through single-section motion or adjustment of flexible gear structure in a traditional design method, and is more accordant with actual working conditions of a harmonic gear transmission device; and the designed rigid gear device is high in overlap ratio, stable in transmission and capable of effectively improving the transmission efficiency.

The invention provides a bolt pre-tightening force identification method based on singular value decomposition and a support vector machine, and belongs to the technical field of vibration signal fault detection. The invention provides a bolt pre-tightening force measuring method based on a vibration signal in order to solve the problems that the pre-tightening force of a bolt is reduced and eventhe bolt is separated and falls off due to the fact that mechanical environments such as impact and vibration generated in the operation process of mechanical equipment. The method comprises the stepsof collecting an impact vibration signal of a single bolt connecting beam in a free state through DASP modal analysis software; carrying out empirical mode decomposition and reconstruction on the experimental data to remove noise and trend terms; carrying out feature dimension reduction by combining singular value decomposition, and extracting a vibration signal feature vector; and taking the vibration signal feature vector as an input feature, performing classifier model training through the support vector machine, and finally realizing pre-tightening force identification of the bolt connecting structure by using the trained classifier.

The invention discloses a method for evaluating the denitrification ability of an SCR reactor, which comprises the following steps: obtaining historical data of each measuring point of the unit from a data source, performing data preprocessing, correcting the oxygen amount at the outlet and inlet NOx concentrations, and calculating the denitration capacity. In addition to the amount of ammonia consumed per unit of NOx, the working conditions of temperature and outlet NOx concentration are divided and typical working conditions are selected, and the ammonia consumption curve of removing unit NOx is fitted and converted accordingly. The upper limit is determined by the relationship between the amount of ammonia and the slip rate of ammonia, and the denitrification capability of the SCR reactor is evaluated in combination with the slope of the trend line and the upper limit. The method for evaluating the denitrification capability of the SCR reactor provided by the invention can realize steady-state tracking and self-adaptive correction calculation.

The invention relates to a rapid high-precision relative pointing control method of a noncoplanar rendezvous orbit, in particular to a feedforward PID (proportion, integration and differentiation) control based rapid high-precision relative pointing control method of the noncoplanar rendezvous orbit, and aims to solve the problem that rapid high-precision tracking-pointing control methods related to satellite attitudes under the noncoplanar rendezvous orbit do not exist in the prior art. The feedforward PID control based rapid high-precision relative pointing control method including adopting an Euler angle for attitude description of a spacecraft, creating dynamical and kinematical equations of the spacecraft, and acquiring an precise expected angle theta according to a noise-containing expected angle z by a Kalman filtering algorithm of a spaceborne computer; designing an attitude control law of each axis according to a formula of ; selecting two parallelly-placed single-frame control moment gyroscopes to control a yaw axis, and selecting two flywheels to control a rolling axis and a pitch axis respectively; calculating gyroscopic moment T and flywheel actual output moment uw to complete rapid high-precision relative pointing control of the noncoplanar rendezvous orbit. The feedforward PID control based rapid high-precision relative pointing control method is applicable to rapid high-precision relative pointing control of the noncoplanar rendezvous orbit.