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254results about How to "Effective avoidance" patented technology

Steering law singularity avoidant spacecraft attitude control system

The invention relates to a steering-law singularity avoiding aircraft attitude control system, comprising an attitude task managing unit, an attitude controller, an attitude measuring unit, a gyro group steering-law unit, a frame angle position measuring unit, a control moment gyro group and an aircraft. The gyro group steering-law unit calculates the frame angle rate of the control moment gyro group by cooperating control moment gyro angle momentum table, zero motion algorithm and pseudoinverse steering-law algorithm, and adopts the angle rate value as the set signal of the control moment gyro group to improve the control precision of the aircraft attitude. The steering-law singularity avoiding aircraft attitude control system introduces the steering-law design method that chooses frame angle rate and the initial value of frame angle position based on look-up table, realizes accurate moment output of the control moment gyro group, avoids the singularity problem produced in the process of calculating frame angle rate of the control moment gyro group by the pseudoinverse steering-law algorithm as well as avoids the deadlock problem caused by the control moment gyro steering law when adopting zero motion algorithm and robust pseudoinverse steering-law iterative computations.
Owner:AEROSPACE DONGFANGHONG SATELLITE

Interior pressure self-adjustable ink supply cartridge structure

An interior pressure self-adjustable ink supply cartridge structure comprises an ink container having an ink accommodating chamber and an adjacent first ink reservoir disposed at one inner side therein wherein a first linkage shallow channel is provided to connect the ink accommodating chamber and the first ink reservoir thereby, and a second linkage shallow channel is associated with the upper edge of the first ink reservoir thereof. A passageway is linked to the other end of the second linkage shallow channel and passed across to a first guide channel of a second ink reservoir disposed at the other inner side of the ink container therein. A second guide channel is disposed extending at the other side of the second ink reservoir to communicate with a continuous winding and shallow regulation duct to which a third guide channel is connected at the other end thereof to associate the regulation duct with a preset empty chamber having an air vent disposed at the upper edge thereon. Via the aforementioned structure thereof, no matter in what state the ink supply cartridge is, whether it's being delivered, opened for ink supply, or shutoff from ink supply thereof, the negative pressure established at the ink accommodating chamber therein can be appropriately maintained on a certain level, efficiently achieving an automatic self-adjustment of interior pressure of the ink supply cartridge so as to avoid the problem of ink leakage or the situation of abnormal ink supply thereby.
Owner:ULIX INT

On-line laser machining apparatus for strengthening and toughening treatment of steel rail surface

The invention discloses an on-line laser processing equipment used for strengthening and toughening of the surface of a steel rail, comprising a laser processing lathe and a power system container. The laser processing lathe comprises a motion actuating mechanism, a laser processing head and / or a control system and a powder feeder which are arranged on a moving cart; and the power system container comprises a power generator, a refrigerator, an air compressor, a cool drying machine and a high-voltage power supply of a laser which are arranged in the container. The laser processing head can be arranged on the motion actuating mechanism and is directly connected with the laser or connected with the laser by a light-guiding system. The invention can complete the laser surface quenching, fused quenching, alloying and cladding treatment of various steel rails which comprises a stock rail, a curve, a guide rail, a switch and the like under the premise that the steel rail is not dismounted and the normal running of trains, thus leading the wear resistance of the processed steel rail to be improved greatly and having the characteristics of simple assembly and disassembly, high processing precision and simple operation and control.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Avoiding forbidden data patterns in coded audio data

Any of several information processing techniques may be used in various information storage and transmission applications to prevent the occurrence of certain "forbidden" bit patterns. According to an encoding technique, a reversible coding process is used to generate an encoded representation of an information stream that cannot contain any forbidden data patterns. This may be accomplished by partitioning the information stream into segments and encoding each segment according to a respective encoding key that is selected such that the results of the coding process cannot contain a forbidden data pattern. According to one substitution technique, all occurrences of forbidden data patterns are replaced with permissible data patterns that do not otherwise occur in the information stream. This may be accomplished by partitioning the information stream into segments, identifying an unused data pattern in a respective segment, and carrying out the replacement of all occurrences of the forbidden data pattern in that segment. According to another substitution technique, all occurrences of a forbidden data pattern are replaced by any permissible data pattern. This may be accomplished by partitioning the information stream into segments, identifying occurrences of the substitution data pattern and the forbidden data pattern in a respective segment, constructing a flag for each occurrence, and replacing all occurrences of the forbidden data pattern in that segment with the substitution data pattern. Decoding keys, substitution data patterns, substitution flags or any other information needed to recover the original information is assembled with the modified information in a form that does not equal the forbidden data pattern.
Owner:DOLBY LAB LICENSING CORP

High-precision moment output control method for control moment gyro group

The invention relates to a high-precision moment output control method for a control moment gyro group. The method comprises the following steps: (1) firstly, establishing a kinetic model of the control moment gyro group; (2) constructing a singularity avoidant manipulation rule algorithm and determining distance threshold values d1 and d2 of the control moment gyro group approaching to a singular area; (3) judging singularity of the kinetic model of the control moment gyro group and calculating a singularity metric value D of the control moment gyro group; if D is larger than d1, a paseudo-inverse manipulation rule algorithm is directly used as the manipulation rule of the control moment gyro group, if D is larger than d2 and smaller than d1, decreasing the accommodation amplitude of a parameter lambda, and if D is larger than 0 and smaller than d2, increasing the accommodation amplitude of the parameter lambda; (4) calculating framework angular speed values of each control moment gyro of the control moment gyro group; (5) integrating framework angular speed and calculating to obtain a framework angle position input to the step (1) for circular calculations and driving the control moment gyro group to output a moment to a satellite according to the framework angular speed values.
Owner:AEROSPACE DONGFANGHONG SATELLITE

Disinfecting robot with sweeping function

The invention provides a disinfecting robot with a sweeping function, and belongs to the technical field of disinfecting devices. The robot is used for solving the problems that disinfecting sterilizing in a public area is low in efficiency and poor in effect. The robot comprises a base and a main body; a sweeping device is arranged on the lower portion of the base, a walking device is arranged onthe lower portion of the sweeping device, and a plurality of laser radars and distance sensors are arranged on the base; and a storage battery, a control assembly and an atomizing disinfecting deviceare arranged in the main body, a sterilizing device is arranged on the upper portion of the main body, and the sterilizing device comprises an annular lamp holder and an ultraviolet lamp set. According to the robot, sweeping dust removing, ground wiping, atomizing disinfecting and ultraviolet lamp sterilizing are integrated, the operation is automatic, the use is convenient, and the work efficiency of disinfecting sterilizing is greatly improved; the sweeping and disinfecting sterilizing work is automatically conducted according to a planned route, so that the time and labor are saved; rotating spraying is conducted after disinfecting atomizing, so that the disinfecting effect is good; and the ultraviolet lamp set can effectively kill bacteria in the surrounding environment, so that bacteria is prevented from breeding.
Owner:安徽伽马莱恩机器人有限公司
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