31results about How to "Solve the stall problem" patented technology

The invention relates to the field of robot trajectory planning, and provides a smooth transition method of multi-space trajectory planning of a teaching robot, aiming at solving the unsmooth problemin the trajectory switching process. The smooth transition method comprises the steps that a teaching program of the teaching robot is analyzed, the switching direction of the trajectory planning is judged, if the trajectory planning is that the switching direction is from cartesian space to joint space, a tail end of cartesian space trajectory planning is acquired, according to the requirements on a path and a velocity, a first posture and a first velocity at the tail end are acquired, first angular velocities of various joints are obtained by employing a jacobi matrix, and by taking an angleindicated by the first posture as a starting angle and the first angular velocities as starting velocities, joint space trajectory planning is carried out; or else, a starting point of the cartesianspace trajectory planning is acquired, a second posture at the starting point and second angular velocities of the various joints are obtained, and by taking an angle indicated by the second posture as a terminal angle and the second angular velocities as terminal velocities, the joint space trajectory planning is carried out. Smooth transition of the trajectory planning in space switching is realized.

The invention discloses a parallel operation axial flow primary fan automatic regulating method and an automatic regulating device. According to the method, a fan current monitoring and comparison module is added on a fan pneumatic blade automatic control module, the current of more than two fans is firstly judged during fan air quantity regulation and control, and the air quantity regulation sequence of a fan is determined according to fan current quantity; the preferential increase of the movable blade opening degree of the fan with low current is used as an air quantity increase regulation condition; the preferential decrease of the movable blade opening degree of the fan with high current is used as an air quantity decrease regulation condition. The optimized control strategy is adopted, the headwind and stall problem of the primary fan is effectively avoided, and the automatic regulation quality of an axial flow primary fan is greatly improved, so guarantee is provided for boiler burning stability.

The invention relates to a winch lifting and standing system for a rocket offshore launching station frame and a lifting and standing control method of the winch lifting and standing system. The winchlifting and standing system comprises a lifting and standing unit and a buffer unit, wherein the lifting and standing unit comprises a winch, a lifting and standing steel wire rope, a lifting and standing pulley and a connecting ring; the buffer unit comprises a supporting arm, a buffer pulley, a reversing pulley, limiting rods, a buffer steel wire rope, a pendant and a butt joint arm, two limiting plates are fixed on the supporting arm, limiting clamping grooves are formed in the left sides of the two limiting plates, the limiting rods are located in the limiting clamping grooves in the twolimiting plates, the limiting rods are connected with one end of the buffer steel wire rope, the other end of the buffer steel wire rope bypasses the reversing pulley and the buffer pulley to be connected with the pendant, the butt joint arm is fixed on a lifting and standing frame, two butt joint plates are fixed at the upper end of the butt joint arm, butt joint clamping grooves are formed in the upper sides of the two butt joint plates. The winch lifting and standing system has the advantages of being simple in structure and stable in action, safe and reliable, good in buffering effect andhigh in adaptability. The lifting and standing control method has the advantages of being simple in process, easy to implement and high in safety.

The invention discloses a garbage collecting and load balancing method and system of a Java virtual machine and aims to solve the problem that the Java virtual machine pauses and affect service when performing global garbage collection. The garbage collecting and load balancing method comprises the steps that S1, the tenured generation usage rate of the Java virtual machine is detected through a detection process of a service server; S2, whether the tenured generation usage rate reaches to a preset threshold value or not is judged, if yes, a notification for pausing a service quest of the current service server is sent to a notifying process of a load balancer, garbage collection begins, and if not, waiting continues. By adopting the garbage collecting and load balancing method, the problem of server pausing produced by garbage collection of the Java virtual machine in a cluster environment is solved.

The invention relates to a tailstock type vertical takeoff and landing unmanned aerial vehicle and a flight control method. The unmanned aerial vehicle comprises a wing-shaped fuselage, wings, four ducted propellers on upper and lower sides of the fuselage, as well as upper vertical fins and lower wingtip undercarriages at the end parts of the wings, wherein drive force is provided to the ducted propellers by batteries or an engine inside the fuselage. The flight control method of the tailstock type vertical takeoff and landing unmanned aerial vehicle comprise methods in a takeoff stage, a takeoff transition stage, a flat flight stage, a landing transition stage and a landing stage. Quad-rotor and fixed-wing flight modes are both achieved, so the loadability of the vertical takeoff and landing aircraft can be improved; by a unique takeoff and landing manner and layout, flight is smoother and more steady; flat flight speed is quick; the stall problem in takeoff and landing transition stages and a flat flight transition stage is better solved.

A stall-eliminating blower for blowing or exhausting is composed of casing, motor, vane wheel and airflow collector, and is characterized by its additional reverse-flow unit, which can make the eddy flow caused by stall flow reversely back to main flow channel, so eliminating stall.

The invention discloses a device and a method for avoiding stall caused by strong wind in a vertical axis wind turbine. The tower is provided with more than one power generation unit, a crane is arranged at the top of the tower, and the crane is provided with a hook; the blade group comprises more than two blades, the blade is arc-shaped and consists of a chord and a corresponding arc, more than one support arm is arranged between the arc and the chord, the support arm is provided with a plurality of lugs hung by the hook, and more than two pulleys are arranged on the chord; tracks, the number of which is as same as that of the blades, are arranged in each power generation unit, wherein the tracks are synchronous with the blades, and sliding mechanisms consisting of the chords and the pulleys are in sliding fit with the tracks; both the upper end and the lower end of the blades are provided with male connecting mechanisms, female connecting mechanisms are arranged on the tracks corresponding to the upper ends and the lower ends of the blades, and the male connecting mechanisms are matched with the female connecting mechanisms; and in strong wind, the blades are hoisted to the ground sequentially from bottom to top through the crane. The device and the method are safe and reliable.

The invention discloses an automatic releasing device for a solar photovoltaic support coiled material and a using method of the automobile releasing device. The method comprises the steps that the end face on the outer side of the coiled material is introduced into a support production line shaft roller, a machine is started for low-speed operation, the operation condition of the coiled material on a support stand column, the rail entering condition of the extending end of the coiled material, the shaft operation condition on a support production line and the coiled material uncoiling constant-speed condition are observed, operation continues when the four states are normally, and if not, the machine is halted till the states are adjusted to be normal. The problems of deflection, stalling, speed reduction and the like caused in existing coiled material uncoiling methods are solved, the solar photovoltaic support manufacturing speed is increased by 1-2 times, the coiled material breakage rate is lowered to 1-2%, labor is reduced by 1/5, the solar support on-site manufacturing cost is reduced, the labor efficiency and product quality are improved, and potential safety hazards are reduced.

The invention discloses a variable pitch system protection system and method in a wind generating set power grid phase-loss fault. According to the technical scheme, the variable pitch system protection system comprises a circuit breaker and a filter reactor, wherein a contactor is additionally arranged between the circuit breaker and the filter reactor, a state of the contactor is controlled by an auxiliary contact of an intermediate relay powered by a switching power supply, the intermediate relay is connected to a driver, and the driver can determine signal input or output according to whether a voltage of a direct-current bus exceeds the limit or not. According to the system, hidden dangers such as overspeed and overloading caused by a variable pitch system during power grid voltage phase loss can be eliminated, and the safety performance and the automation degree of a set are improved.

The invention discloses an automobile brake-by-wire system and belongs to the technical field of automobile brake systems. The system comprises a motor, a magnetorheological clutch, a planetary gear train, a planetary roller screw mechanism, a giant magnetostrictive driving mechanism, a main cylinder, a brake actuating mechanism, a brake pedal, a pedal simulator, a sensor and a controller. According to the brake system, a vacuum booster in a traditional hydraulic brake system is replaced by the motor, so that dependence on the vacuum degree of an engine is eliminated; the magneto-rheological clutch is used for effectively solving the problem of motor stalling during long-time braking; a planetary gear train is used for reducing speed and increasing torque, and the requirements for motor rotating speed and power are reduced; a planetary roller screw mechanism is used for replacing a traditional gear rack mechanism and a traditional ball screw mechanism, and the problems that the bearing capacity is insufficient and the service life is short are effectively solved. And the giant magnetostrictive driving mechanism is used as an auxiliary driving device, so that the system response time is prolonged, and meanwhile, the potential safety hazard caused by using a high-pressure energy accumulator is avoided.

The invention relates to the field of hovercraft motion control, in particular to a hovercraft high-speed rotation control method based on longitudinal speed planning. According to the invention, the speed planning method based on sideslip angle constraint is adopted to solve the stall problem of the hovercraft during high-speed rotation by adopting traditional nonlinear feedback control, so that accurate speed tracking can be realized while the hovercraft rotates, and the maneuverability and operation capability of the hovercraft are improved; and according to the method, it is guaranteed that the hovercraft accurately tracks the expected heading in the high-speed rotation process, meanwhile, the drifting phenomenon caused by the too large rotation rate is avoided, and the reliability and safety of the hovercraft in the high-speed rotation process are improved.

The invention provides an integral saw combined type double-flywheel saw blade group system for wood. The integral saw combined type double-flywheel saw blade group system for wood comprises a first saw blade group and a second saw blade group, wherein the first saw blade group comprises a first rotating shaft, a first saw blade, a first bearing, a first inner positioning sleeve, a first outer positioning sleeve and a first conical shaft; the second saw blade group comprises a second rotating shaft, a second saw blade, a second bearing, a second inner positioning sleeve, a second outer positioning sleeve and a second conical shaft; and a first belt pulley and a second belt pulley are respectively arranged at the front end of the first saw blade group and the front end of the second saw blade group. The invention further discloses a wood cutting process. A cutting machine is used in the wood cutting process and comprises the integral saw combined type double-flywheel saw blade group system for wood. The saw blade groups are successively and fixedly mounted on the corresponding rotating shafts, the front ends of the rotating shaft are disassembled and assembled by a tapered connecting structure, a left shaft sleeve and a right shaft sleeve can be separated and firmly combined, the wood is cut by the two saw blade groups, and requirements on a motor are reduced while the cutting efficiency is improved effectively.

The invention provides an unmanned ground effect aircraft with a slide-way type adjusting device. The unmanned ground effect aircraft comprises an unmanned ground effect aircraft body and the slide-way type adjusting device arranged on the middle longitudinal axis in the unmanned ground effect aircraft body. The slide-way type adjusting device comprises a fixing shaft, a moving sliding block, a traction lock chain, a hydraulic mechanism and a gyroscope. By arranging the slide-way type adjusting device in the unmanned ground effect aircraft, the problem that takeoff power is excessive caused byoverlong sliding distance and insufficient lifting force when the ground effect wing aircraft is in a take-off stage is effectively solved; the problem of aircraft stall caused by excessive elevationangle at the moment when the aircraft is out of water surface in the take-off stage is further effectively solved, so that the ground effect wing aircraft takes off before reaching resistance peak ina short time and a short distance, the stability and safety during flight are ensured, and the installation of the device is simple and rapid.

The invention provides an integral wood sawing device with double draw blade groups and a wood cutting process. The integral wood sawing device comprises a saw box. From the right end to the right end, the saw box is divided into a first saw cavity and a second saw cavity by fixing beams. A feeding platform is fixedly arranged, at the bottom end of the box body, in the first saw cavity. A feeding conveyor belt surrounds the feeding platform, and is driven by a first drive roll. A first deadweight roller is arranged at the upper end of the feeding conveyor belt movably, and a second deadweight roller is arranged at the upper end of the inside of the second saw cavity movably. A first saw blade group and a second saw blade group are respectively fixedly arranged on the left side wall and the right side wall of the fixing beams, and are distributed in staggered way from up to down. The invention further discloses the wood cutting process adopting the integral wood sawing device with double saw blade groups; wood is cut after being conveyed by the conveyor belt. As belt pulleys are driven by a single motor and a fly-wheel structure is utilized, energy consumption is lowered while environmental friendliness and energy conservation are achieved.

The invention provides an anti-stall double-layer pump inlet structure. A horn seat and a separation seat are arranged at a pump inlet, the horn seat and the separation seat are both of horn mouth structures, the separation seat covers the surface of the horn seat through a support, and a circle of annular gap is reserved between the separation seat and the horn seat, so that a water inlet flow channel of a pump is divided into two parts, the part located in the center is a main inlet, and a gap between the horn seat and the separation seat forms an auxiliary inlet. The water inlet flow channel of the pump is divided into the main inlet and the auxiliary inlet through the separation seat, when the pump operates under the small-flow working condition, backflow at the inlet of the pump is discharged outwards through the divided auxiliary inlet, thus the main inlet is prevented from being blocked due to the backflow, the stall problem under the small-flow working condition is solved, the anti-stall performance of the pump is improved, and the application range of the pump is widened.