34results about How to "Reduce the number of changes" patented technology

The control apparatus for an electric rotating machine includes a prediction section to predict a controlled variable of the electric rotating machine applied with an output voltage of a power conversion circuit for each of prescribed operation states of the power conversion circuit, and a manipulation section to manipulate the power conversion circuit to operate in one of the respective operation states determined as an actual operation state based on the controlled variable predicted by the prediction section. The control apparatus further includes an average voltage direction calculating section to calculate a direction of an average output voltage vector of the power conversion circuit. The manipulation section includes a priority setting section to set priority for each of the operation states based on the direction of the average output voltage vector calculated by the average voltage direction calculating section in determining the actual operation state.

The invention provides a finish machining turning tool which comprises a turning tool body and a special-shaped turning insert; and each of a main cutting blade and an auxiliary cutting blade of the special-shaped turning insert is an arc with R being 40-50mm and has the blade length of 8-10mm, a main back cutting surface is an arch-shaped surface with R being 6-7mm, an auxiliary back cutting surface is an arch-shaped surface with R being 6.5-8mm, the intersection of the main back cutting surface and the auxiliary back cutting surface of the special-shaped turning insert is an arch-shaped edge, and the edge participates to turning as a cutting blade in the turning process. By adopting the finish machining turning tool provided by the invention, the stress condition of a cutter and the discharge direction of cuttings when the cutting depth is smaller than 0.05mm during finish machining turning can be effectively improved, and the problems of vibration, extrusion cutting and scratching of a processed surface with the cuttings are solved; and sleeking processing is performed while turning is performed, and the difficulty of finish machining turning and the surface roughness of a workpiece are lowered.

The invention relates to the technical field of unmanned gyroplane autonomous tracking, in particular to an unmanned gyroplane moving target autonomous tracking device based on a pan-tilt camera and an airborne sensor. The unmanned gyroplane moving target autonomous tracking device comprises an aircraft and a ground station. The aircraft comprises an aircraft controller, an aircraft propeller motor connected with the aircraft controller, and a pan-tilt motor. The pan-tilt motor is connected with the pan-tilt camera. A wireless image transmission module and a wireless data transmission module are arranged between the aircraft and the ground station. The aircraft and the ground station are connected through the wireless image transmission module and the wireless data transmission module. Images obtained by the airborne pan-tilt camera serve as input of a system, coordinates of a target in the images are obtained on the ground station through a Struck algorithm, modeling is conducted on the coordinates of the target through a uniformly accelerated motion (CA) model, the control quantity of a pan-tilt is designed according to the coordinates, estimated through modeling, of the target, and accordingly tracking instantaneity and smoothness of the pan-tilt camera are guaranteed.

The invention discloses an optical flow sensor integrating cameras with different focal lengths, which relates to the field of visual positioning sensor design for rotor drones, including a circuit board, a ranging sensor, an embedded chip, and a camera; wherein, the ranging sensor and the The camera is configured on one side of the circuit board; the embedded chip is configured on the other side of the circuit board, and the embedded chip is respectively connected with the distance measuring sensor and the camera. The present invention adopts a plurality of fixed-focus cameras to increase the zoom speed and meet the rapidity requirements of optical flow. When it is in a wide range of different heights, it improves the definition of the ground texture picture used for estimating the optical flow speed, and through the optical flow The method can accurately obtain the actual movement speed of the rotor UAV, thereby improving the overall computing efficiency.

The invention discloses an anti-collision method, device, computer-readable storage medium and equipment of an RFID system, belonging to the technical field of radio frequency identification. The method includes: Step S100: Estimate the number of tags and group the tags; Step S200: Determine the time slot parameter according to the number of tags in the current group; Step S300: Send a command with time slot parameters to the tag, and the tag receives the command Then generate a random number as the time slot value; step S400: open three time slots each time and receive the response signal of the tag at the same time, and mark the time slot as an idle time slot, a successful time slot or a collision time slot according to the situation of the response signal; step S500: Adjust time slot parameters according to the number of free time slots, successful time slots and collision time slots; if the number of successful time slots is 0, return to step S200; otherwise, return to step S300. The invention has high versatility, is simple and easy to implement, solves the label starvation problem, reduces the possibility of label collision, improves system identification efficiency, and optimizes system performance.

The present invention provides a practical Byzantine fault-tolerant node setting method, wherein, the consensus message sent by the consensus node is received, and the information of the first consensus node is extracted from the consensus message, wherein the first consensus node is the one for sending the consensus message The set of consensus nodes; according to the received consensus message, extract the execution result of the consensus node, and according to the execution result, divide the first consensus node into the second type of Byzantine nodes and non-Byzantine nodes; extract The second consensus node information saved by the client, according to the first consensus node information and the second consensus node information, obtains the first type of Byzantine node; performs the first processing on the first type of Byzantine node, and performs the first processing on the second type The node does the second processing. The present invention distinguishes different types of Byzantine nodes, and adopts different processing strengths for different types of Byzantine nodes, can keep non-malicious Byzantine nodes as much as possible, reduces the number of view changes, saves online computing resources, and Try to eliminate malicious fraud or attacking Byzantine nodes to ensure the safe and reliable operation of the system.

The invention provides a group management elevator system which sets possibility of allocating a hall call to a specified elevator lift car to be different from those to other elevator lift cars, so as to increase convenience for passengers. A group management control device excludes an elevator lift car which runs in a specified running mode from allocation objects of hall calls (S42). After a new hall call is logined (S43, YES), the group management control device calculates an evaluation value used for allocation according to a current position, load, the number of allocated hall calls, a heading layer and a moving direction of the elevator lift car. Besides, the group management control device calculates a specified evaluation vale for the specified elevator lift car capable of being switched into the specified running mode, and adds the specified evaluation vale and the evaluation value used for allocation. The group management control device allocates the hall call to the elevator lift car with the lowest evaluation value.

The invention discloses an optimized-levenberg-marquardt (LM)-algorithm-based laser radar waveform decomposition method. The method comprises the following steps that: (1), a laser radar system records observation waveform data of back scattering in a digital mode; (2), signal enhancement is carried out on the observation waveform data, wherein the signal enhancement contains noise processing and smoothing processing; (3), a threshold value is set, peak-inflection point detection is carried out on the enhanced signal, and initialization estimation values containing a number, an amplitude, a position, and a pulse width initialization parameter are determined; (4), a standard LM algorithm is corrected by using an improved training module and iteration is carried out on the initialization estimation values to obtain feature parameters, including amplitudes, positions, and pulse widths, of all components of the enhanced signal; and (5), goodness of fit is calculated by using fitting data and original observation data and precision of the goodness of fit is determined; and an efficiency of a fitting algorithm is determined by using the number of times of iteration.

The present invention relates to the technical field of semiconductor manufacturing, in particular to a wafer chip cutting method, in which a tool cuts all the first slits in the first cutting direction and then cuts all the second slits in the second cutting direction. A cutting direction and a second cutting direction are perpendicular to each other, and the first cutting direction is parallel or perpendicular to the central axis of the wafer chip, and at least in the second cutting direction, the cutting position of the cutter is at within the active area of ​​the wafer chip. In the wafer chip cutting method of the present invention, at least in the second cutting direction, the cutting positions of the knives are all in the effective area of ​​the wafer chip, and there is a certain distance from the invalid area of ​​the edge of the wafer chip, which can reduce the existing At the knife exit position, the crystal grains formed in the invalid area of ​​the cutting edge of the knife can easily fly away from the blue film and damage the knife under the impact of the water flow.