14results about How to "Decelerate fast" patented technology

The invention relates to the technical field of detection equipment, in particular to a ship propeller static balance detection device which comprises a rotary table, a rotating and fixing arm and a supporting shaft, the axis of the rotary table is vertical, the rotating and fixing arm is horizontally installed on the rotary table, the length direction of the rotating and fixing arm is in the radial direction of the rotary table, and the supporting shaft is installed at the end, away from the rotary table, of the rotating and fixing arm. The axis of the supporting shaft is vertical, the supporting shaft rotates on the rotating and fixing arm, and a clamping structure used for fixing the propeller is arranged on the supporting shaft; the gravity center shift of the propeller is detected by using centrifugal force to replace the action of gravity in a traditional mode, and larger acting force can be provided for the propeller, so that small unbalance can be detected more easily, and the detection sensitivity is improved; through the damping structure, the propeller can be rapidly decelerated and stopped as soon as possible, the situation that the propeller needs to be naturally decelerated for a long time to stop in a traditional method is avoided, and the detection time is greatly shortened.

The invention discloses an unpowered returning-field aircraft spoiler speed control method based on active disturbance rejection control, belongs to the technical field of unmanned aerial vehicle flight control, and aims to solve the problem that high-precision speed control is difficult to realize due to insufficient robustness when a traditional spoiler control strategy faces a complex and changeable environment and unknown disturbance. According to the method, the expansion state observer introducing active disturbance rejection control is adopted, unmodeled dynamics and external disturbance in the system are estimated on line and compensated in real time, the speed deviation is responded in a short time, the adaptive capacity to unknown disturbance is remarkably improved in unpowered return field section spoiler speed control, and the speed control accuracy of the spoiler is improved. According to the method, the dependence on an accurate model is reduced, higher-precision and more robust speed control is realized, and an effective technical means is provided for safe, stable and accurate landing of unmanned aerial vehicles and other unpowered landing aircrafts.

The utility model relates to expressway emergency technology field, put forward a kind of vehicle-mounted automatic expressway rapid road sealing device, including mounting bracket, support plate, multistage telescopic frame, winding shaft, gear, servo motor and pull rope.Mounting bracket is located on vehicle, support plate is fixed in the middle part of mounting bracket, both sides are respectively equipped with multistage telescopic frame, winding shaft is rotatably connected with support plate, winding shaft top is equipped with gear, the output shaft of servo motor is fixedly connected with one gear, two gears are engaged with each other;Winding shaft winding pull rope is connected with multistage telescopic frame end respectively.Multistage telescopic frame is composed of multistage U-shaped frame body sleeve, and elastic sheet is equipped in each telescopic frame.One winding shaft upper end and lower end are equipped with threaded rod, threaded rod drives limit frame lifting by moving plate, limit frame is equipped with spring and limit block in it.Can be through the control multistage telescopic frame unfolding and contraction, form temporary roadblock behind expressway emergency operation vehicle, to realize rapid road sealing and vehicle deceleration.

The invention relates to a braking system in an at least partially autonomous vehicle, which has a wheel brake (1) for each wheel (VR, VL, HR, HL), the wheel brakes being equipped with a main brake control system (BRS1) and a redundant secondary brake control system (BRS2), the main brake control system having a main controller and an electromechanical main actuator for each wheel for actuating the wheel brakes, the main controller generating a main control signal for actuating the corresponding electromechanical main actuator based on a theoretical deceleration preset value generated in a pilot system and / or a theoretical deceleration preset value generated on the driver's side by means of a brake pedal. According to the invention, the secondary brake control system has a secondary controller independent of the main controller and an electromechanical secondary actuator independent of the main actuator for each wheel. The secondary controller generates a secondary control signal for actuating the corresponding electromechanical secondary actuator based on the theoretical deceleration preset value generated in the pilot system.

The application provides a wing-body fusion back support engine reverse thrust device capable of inhibiting air intake distortion, which comprises a ring-shaped reverse thrust vane located on the inner side of a back support engine nacelle cover and reverse thrust flow guiding plates located on the two side surfaces of a back support engine nacelle support. When reverse thrust is needed, with the increase of the unfolding angle of the flow guiding plates, the hindering effect of the flow guiding plates on the forward movement of the reverse thrust air flow is more and more significant, so that the air intake quality of the turbofan engine during the reverse thrust work is ensured; in addition, the flow guiding plates also have the interference effect on the air flow similar to that of a spoiler, so that the form resistance is increased, which is beneficial to the faster deceleration of the airplane. The application effectively solves the adaptability problem of the reverse thrust device and the wing-body fusion back support engine, inhibits the occurrence of air intake distortion, strengthens the braking effect of the reverse thrust device, and guarantees the flight safety of the wing-body fusion back support engine layout.

The utility model relates to a roller passing transmission speed compensation mechanism which comprises a main driving assembly, a transmission part and a roller passing assembly, the main driving assembly and the roller passing assembly are installed on a machine frame, the main driving assembly is connected with the roller passing assembly through the transmission part, and the main driving assembly comprises a main driving roller, a transmission shaft, a motor, a driving wheel and an installation base. The mounting seat is mounted on the rack, the motor is mounted on the mounting seat, the main driving roller and the driving wheel are fixedly arranged on the transmission shaft, the transmission part is connected with the driving wheel, and the motor drives the transmission shaft to rotate. According to the passing roller transmission speed compensation mechanism, the main driving assembly and the passing roller assembly are connected through the transmission piece, it is guaranteed that the main driving assembly and the passing roller assembly can rotate synchronously when transmitting pole pieces, the reverse acting force on the pole pieces caused by passing roller inertia can be greatly reduced, the passing roller of 150 mm is adopted for transmitting the pole pieces, the pole lug turnover probability is reduced by 50%, and the pole piece transmission speed is improved. The passing roller is installed in a two-end fixing mode, and the strength of the passing roller is improved.

The invention discloses a low-altitude manned aircraft, and relates to the technical field of manned aircrafts, the low-altitude manned aircraft comprises a cavity, the lower surface of the cavity is fixedly connected with a fixing plate, the upper surface of the cavity is provided with a flight mechanism, the flight mechanism comprises a fixing frame and a fixing box, the fixing box is fixedly connected to the outer surface of the cavity, and the fixing plate is fixedly connected to the fixing frame. The fixing frame is fixedly connected to the upper surface of the fixing box, and the flying mechanism is arranged, so that the cavity can complete take-off work under control, and the effect of flying in different directions in the air under control is achieved; an air circulation mechanism penetrates through the upper surface of the cavity, the air circulation mechanism is used for purifying air in the cavity, the air circulation mechanism comprises an exhaust pipe, the exhaust pipe penetrates through the upper surface of the cavity, and a first supporting rod is fixedly connected to the top end of the exhaust pipe; the end of the first supporting rod is fixedly connected with a stepping motor, and the effect that the aircraft can be flexibly changed to stop on the water surface and the ground is achieved.

The utility model discloses a large-ramp locomotive magnetic track safety auxiliary braking device, and belongs to the technical field of locomotive magnetic track braking. Comprising a brake box, inclined plates are fixedly connected to the two sides of the brake box, first magnetic attraction frames are arranged on the two sides of the interior of the brake box, a plurality of second magnetic attraction frames are arranged between the two first magnetic attraction frames, the inclined plates are matched with fixing blocks, and when the first magnetic attraction frames and the second magnetic attraction frames are gathered together, the first magnetic attraction frames and the second magnetic attraction frames are mutually fixed; and when the first magnetic attraction frame and the second magnetic attraction frame are scattered, the spherical head can freely turn over in the arc-shaped groove, so that the first magnetic attraction frame and the second magnetic attraction frame as well as the second magnetic attraction frame and the second magnetic attraction frame can swing mutually, and the braking effect is improved. In the process that the first magnetic attraction frame and the second magnetic attraction frame are attracted to the rail, the angle between the first magnetic attraction frame and the second magnetic attraction frame can be freely adjusted according to the radian of the rail, and therefore the electromagnet is prevented from disengaging from the rail and affecting the braking effect of a locomotive.

The utility model relates to a tackle speed reducer which comprises a fixing frame, a rotating frame arranged above the fixing frame and provided with one end hinged to the fixing frame, and a plurality of rubber sheets evenly arranged on the two sides of the top of the rotating frame in the advancing direction of a tackle, and a rotating cam is rotationally assembled at the end, away from the hinged position of the fixing frame and the rotating frame, of the fixing frame. The rotating cam is located below the rotating frame, and the rotating cam can abut against the bottom face of the rotating frame and drive the rotating frame to rotate upwards in the upward rotating process, so that the tackle moves from low to high on the rotating frame. A plurality of grooves in one-to-one correspondence with the rubber sheets are formed in the top of the rotating frame, compression springs stretching out and drawing back in the direction perpendicular to the length extension direction of the rotating frame are arranged between the bottom faces of the grooves and the bottom faces of the corresponding rubber sheets, and the compression springs are used for jacking the rubber sheets upwards so that the rubber sheets can make friction contact with the tackle. The technical problems that a pulley is slow in speed reduction and long in braking distance are solved.

The present application discloses a motor driving method, a motor driving system, an electronic device and a storage medium, the method comprising: in response to receiving a deceleration instruction, obtaining the current running speed of the driven device as the initial speed; in response to the initial speed satisfying a preset speed condition, using at least one of the several driving motors driving the driven device as a passive motor, setting the phase of the passive motor to a preset fixed phase value as a deceleration damping of the other several driving motors, so that the driven device is decelerated to the target speed specified by the deceleration instruction; wherein the several driving motors coaxially drive the driven device. In the above manner, when the driven device needs to decelerate, by setting the phase of one of the several driving motors used to coaxially drive the driven device to a preset fixed value, so as to be used as an auxiliary deceleration damping of the driven device, the deceleration of the driven device is accelerated, and the stability of the deceleration process can be improved by adding resistance to decelerate.

The utility model discloses a bridge safety guardrail which comprises a fixed beam. The guardrail assembly is arranged on the inner side of the fixed beam, the guardrail assembly comprises a mounting beam and an anti-collision part, the mounting beam is parallel to the fixed beam, the anti-collision part is rotationally mounted on the side, away from the fixed beam, of the mounting beam, and a damping part is arranged at the joint of the anti-collision part and the mounting beam; the guardrail assembly is connected with the fixing beam through the buffering assembly, the buffering assembly comprises at least one set of second buffering parts, and the at least one set of second buffering parts comprises a plurality of elastic parts which are overlapped with one another. The anti-collision part is impacted to rotate, the vehicle can be effectively prevented from flying out of the bridge, the damping part generates resistance to rotation of the anti-collision part, and therefore external braking force can be provided for the impacted vehicle, and the vehicle can be decelerated faster. Through deformation of the elastic part, radial impact is buffered, the kinetic energy of an automobile is reduced, and the damage probability of the guardrail is reduced. The buffering effect of the guardrail can be improved through the overlapped use of the multiple elastic parts.

The utility model relates to the technical field of handrail rails, in particular to a handrail rail for high-rise emergency escape, which comprises a rail and universal wheels, a separation mechanism is arranged on the rail, the separation mechanism comprises a fixed shaft, a torsion spring and a dust shield, the bottom of the dust shield is clamped with the torsion spring, and the bottom surface of the dust shield is rotatably connected with the fixed shaft. Through the arrangement of the separation mechanism, the two rows of dust shielding plates are separated through the universal wheels and the separation plate so that the universal wheels can roll in the universal wheel grooves, after the universal wheels pass through the dust shielding plates, the torsional springs are limited between the dust shielding plates and the rails, the dust shielding plates can cover the universal wheel grooves again through the bounce force of the torsional springs, and therefore dust and chippings are effectively prevented from entering the dust shielding plates, and the service life of the dust shielding plates is prolonged. Therefore, stagnation of the universal wheel caused by barrier blocking is avoided, meanwhile, jolting of the universal wheel caused by the barrier is avoided, the universal wheel runs more smoothly, and the best escape time is won for escapers.

The invention discloses a coating drying device and a using method thereof, and belongs to the field of drying equipment, the coating drying device comprises a box body, a feeding port and a discharging port are symmetrically formed in the side wall of the box body, guide rollers are arranged on the box body, and a workpiece is supported through the guide rollers to stably penetrate through the box body; the air pipes are uniformly mounted in the box body, the air heater for providing hot air for the air pipes is mounted on the box body, and the bottom walls of the air pipes are opened, so that the air pipes blow hot air to the surfaces of workpieces through the openings, and the workpieces can be dried; the coating on the surface of the workpiece is preliminarily dried when passing through the position below the first air pipe, and at the moment, the top coating does not flow again when not subjected to friction force; according to the scheme, the partition plate, the negative pressure assembly and the air inlet are arranged; low-temperature gas can be transferred, the contact probability of the low-temperature gas and high-temperature gas exhausted from the gas pipe is reduced, then the heat exchange effect between the high-temperature gas and a workpiece is improved, and the heat utilization rate of the high-temperature gas is increased.

The invention provides an emergency braking system and method of a vehicle and the vehicle. The emergency braking system includes an input module configured to receive an emergency braking request from a user and generate an input signal; the control module comprises a vehicle control unit, and the vehicle control unit is configured to generate an emergency braking instruction based on the input signal; a processing module including a battery management system configured to generate a power-off signal based on the emergency braking command; and the driving module comprises a motor, and the motor is configured to stop running in response to the power-off signal. According to the emergency braking system, the vehicle can be braked under the emergency condition according to needs. In addition, the emergency braking system of the present invention brakes the vehicle based on a user request and using the battery management system, whereby the vehicle can decelerate or stop faster, improving the safety of the user and the vehicle.