24 results about "Lower velocity" patented technology

The utility model relates to a kind of mixing device for epoxy zinc-rich primer processing, including base and mixing barrel, the upper surface of base is equipped with the positioning sleeve for positioning mixing barrel;The side of base upper surface is installed with lifting plate by lifting module, hollow shaft is rotatably installed in the inside of lifting plate and penetrates, the both sides of hollow shaft outer surface are equipped with scraper by elastic mechanism;Stirring shaft is rotatably installed in the inside of hollow shaft, the upper and lower ends of stirring shaft are extended to the outside of hollow shaft, and dispersion disc is installed at the bottom of stirring shaft. By the transmission cooperation of linkage mechanism and transmission mechanism, while stirring shaft high-speed rotation is carried out to the material stirring, scraping plate is driven to slowly rotate to scrape the material adhered to the inner wall of mixing barrel and make it mix in stirring, since scraping plate can rotate at lower speed, so it can guarantee scraping material while reducing the wear and tear with the inner wall of mixing barrel, improve service life.

An automated method of washing a fluidic system 210 of an IVD analyzer 200 from a previous fluid is disclosed, the fluidic system 210 comprising at least one fluidic path 211, 213, 215. The method comprises controlling by a controller 250 a pump 240 and at least one fluid-selection valve 230 for pumping a wash fluid 221 and / or air 232 through the at least one fluidic path, wherein in a time-priority mode 10 the method comprises pumping at higher speed air, in a first step 11, in order to remove the previous fluid from the at least one fluidic path, and wash-fluid plugs alternated to air plugs, in a second step 12, in order to wash out residuals of the previous fluid, and wherein in a wash-fluid-priority mode 20 the controller 250 is configured to operate according to either a sample-wash mode 30 if the previous fluid is a sample 2 or according to an other-fluid-wash mode 40 if the previous fluid is any fluid other than a sample 2, wherein in the sample-wash mode 30 the method comprises pumping air at lower speed, in a first step 31, in order to remove the previous fluid from the at least one fluidic path, pumping at least one wash-fluid plug at higher speed, in a second step 32, and pumping wash-fluid plugs alternated to air plugs at lower speed, in a third step 33, in order to wash out residuals of the previous fluid, and wherein in the other-fluid-wash mode 40 the method comprises pumping air at lower speed, in a first step 41, in order to remove the previous fluid from the at least one fluidic path and pumping wash-fluid plugs alternated to air plugs at lower speed, in a second step 42, in order to wash out residuals of the previous fluid.

The invention discloses a servo motor PID position pointing smooth optimization method based on acceleration feedback, and belongs to the technical field of motor control. The method comprises the following steps: acquiring PID parameters, a motor target position and in-place preset time; determining an acceleration section, a deceleration section and an adjustment section in the travel according to the starting point and the target position; executing acceleration section three-loop PID control, and adjusting a position loop command value according to acceleration feedback; executing deceleration section three-ring PID control, and adjusting a position ring command value according to acceleration feedback; adjusting section PID control is executed, and the position loop command value is kept at the final position; according to the invention, the position ring command value during execution of each position ring can be dynamically adjusted according to real-time acceleration measurement and calculation, so that the movement speed of the motor from the initial position to the final position is ensured to be a smooth acceleration-first deceleration-second movement curve; the target position is approached at a low speed, so that the position, speed overshoot and in-place position fluctuation can be effectively reduced, and the pointing precision of the servo motor is remarkably improved.

This invention provides a nozzle, method, and open-face wind tunnel for improving flow field quality. The nozzle for improving flow field quality has a coaxial double-layer jet, comprising a main jet and an outer jet coaxial with and surrounding the main jet, wherein the outer jet has a lower velocity than the main jet. This invention directly alters the starting position of the shear layer of the open-face wind tunnel jet, i.e., the nozzle structure, minimizing the generation of large-scale vortex structures and effectively maintaining good flow field quality in the wind tunnel test section (downstream of the nozzle).

The utility model discloses a defoaming type water-based damping coating discharging device based on continuous lifting bearing, which comprises a discharging support frame, a discharging pipeline is fixedly connected to the side surface of the lower end of the discharging support frame, a driving motor is fixedly connected to the lower surface of the discharging support frame, a stirring cylinder is rotatably connected to the bottom surface of a groove of the discharging support frame, and a stirring rod is fixedly connected to the bottom surface of the groove of the discharging support frame. A fixed baffle is arranged on the side surface of the discharging bearing frame, and an electric push rod is fixed to the upper surface of the fixed baffle. The defoaming type water-based damping coating discharging device based on continuous lifting bearing is provided with a stirring cylinder and a stirring rod, so that when the device works, materials are stored through a discharging bearing frame, and then the stirring cylinder is driven to rotate through a driving motor; and the stirring cylinder drives a stirring rod on the surface to stir the water-based damping coating at a lower speed, and bubbles are promoted to rise to the surface of the coating and are broken, so that the distribution uniformity of the damping material is improved, and the damping performance of the coating is improved.

When a holding unit is lowered, a control unit gradually increases the lowering velocity of the holding unit toward a target lowering velocity, performs a constant velocity lowering operation of maintaining the lowering velocity of the holding unit at the target lowering velocity, and then gradually decreases the lowering velocity of the holding unit from the target lowering velocity to stop the holding unit. The control unit controls the drive unit to gradually increase the rotational velocity of the pulleys in response to a gradual decrease in the diameter of the outer surface of the belt wound-up around the pulley by unwinding in the constant velocity lowering operation.

The application belongs to the technical field of submarine cables, and particularly relates to a method and system for optical cable pay-off tension control for optical and electrical composite submarine cable cabling, wherein a control unit is used to control an optical cable pay-off reel to reduce tension, and meanwhile, the production speed of a cabling machine is controlled to be reduced, and the biggest advantage of reducing the production speed of the cabling machine is to ensure stability; the cabling speed is reduced by a lower speed, that is, the cabling winding speed is reduced, and in the case that the cable speed of the upstream supply is still relatively high, the tension of the cable as a whole at the end is quickly relieved, and then the tension is transmitted to the upstream to relieve and reduce the tension of the cable as a whole, and meanwhile, the speed can be reduced to improve production stability, and the optical cable pay-off reel is controlled to reduce tension, and the tension relief at a higher speed is performed from the pay-off end of the upstream, so that bidirectional tension relief between the optical cable pay-off reel and the cabling machine is realized, and thus the stress relief of the optical cable is accelerated, so as to reduce the problem that the tension adjustment is not timely due to the delay of the tension adjustment of the pay-off reel.

The invention discloses a step loss calibration method for a stepping motor of a general engine electric injection throttle valve. The step loss calibration method comprises the following steps that the throttle valve opening degree and the difference value between the target rotating speed and the actual rotating speed of the general engine are collected in real time; judging whether the stepping motor loses step or not and judging the step losing direction according to the opening degree of the throttle valve and the rotating speed difference value; and when the stepping motor loses steps and the rotating speed does not reach the target rotating speed, controlling the stepping motor to rotate in a low-speed mode for compensation. Whether the step of the stepping motor is lost and the step losing direction are judged by judging the opening degree of the throttle valve and the difference value between the target rotating speed and the actual rotating speed of the general gasoline engine. If the stepping motor loses steps and the rotating speed does not reach the target rotating speed, the stepping motor enters a stepping motor step loss compensation mode, the stepping motor is controlled to rotate at a low speed, and therefore larger torque can be provided to drive the throttle valve to rotate.

A position control device for controlling a position of a control target is configured to calculate a velocity command value and a torque command value based on a position command value and a position detection value; determine, based on the velocity command value calculated from the position command value, whether or not the control target is operating at a constant velocity in a very low velocity region in which the velocity of the control target is in a velocity range that is less than or equal to a predefined threshold value; and then add, in response to determining, based on an acceleration command value, that the control target is being in very low constant velocity operation, a friction compensation amount for compensating for friction generated in the very low constant velocity operation to at least one of the torque command value, the velocity command value, and the position command value.

A method for full-parameter calibration of low-speed wind tunnels for wind environment testing in transportation and ports is disclosed. The method includes: constructing a full-parameter calibration device at the lower limit flow velocity; calibrating the wind tunnel's lower velocity limit, flow stability at the lower velocity limit, velocity ratio, turbulence intensity, flow uniformity, and axial velocity gradient; constructing a full-parameter calibration device at non-lower limit flow velocities; calibrating the wind tunnel's upper velocity limit, flow stability, velocity ratio, temperature rise, and noise; constructing an airflow deflection calibration device; and calibrating the wind tunnel's airflow deflection angle. This invention achieves full coverage and integrated calibration of nine key parameters of low-speed wind tunnels; significantly improves calibration accuracy and reliability across the entire flow velocity range; enhances the repeatability and consistency of calibration results; and features a simpler, more efficient, and more operable process, adaptable to various low-speed wind tunnel structures such as closed-loop and open-loop systems. It provides accurate, reliable, and standardized technical support for transportation, waterway engineering, port engineering, wind speed sensor calibration, and extreme wind environment simulation testing.

The invention discloses a bidirectional spiral mixing stirrer which comprises a shaft rod used for driving blades on the shaft rod to rotate; the first breaking conveying blade group is arranged from one end to the middle of the shaft rod; the spiral directions of the first breaking conveying blade group and the second breaking conveying blade group are opposite; the first breaking and conveying blade group and the second breaking and conveying blade group are used for breaking and conveying powder; the first breaking conveying blade set and the second breaking conveying blade set each comprise at least one first arc-shaped blade, at least one second arc-shaped blade and at least one spiral blade. The first arc-shaped blade, the spiral blade and the second arc-shaped blade are not connected. The invention further discloses a stirring machine. When the first arc-shaped blade and the second arc-shaped blade rotate, the first arc-shaped blade and the second arc-shaped blade continuously and efficiently break and smash powder, and meanwhile the powder is pushed to move towards the middle of the shaft rod at a low speed, so that the powder is turned over and stir-fried, and the powder is not prone to caking.

A control system designed to control the powertrain of a motor vehicle so that it operates in a selected configuration from a variety of options. the control system is designed to receive an environmental indicator signal that shows the presence of traffic lights in front of the vehicle, the control system is designed to predict, based on the ambient display signal, whether it is necessary to bring the vehicle to a standstill or to brake to a relatively low speed at a given time, wherein the control system is designed so that, if it is predicted that the vehicle will need to come to a standstill or decelerate to a relatively low speed at a certain time, the powertrain is made to operate in a second configuration rather than a first configuration before a braking torque is requested from the braking system by a driver or an automatic control system, wherein the control system is designed to perform regenerative braking when a braking torque is required, wherein wheels connected to the drivetrain cause one or more electric machines coupled to the drivetrain to generate electrical current for storage in a charging storage device, wherein in the first configuration a first group of one or more wheels is arranged for propulsion by the drive train and in the second configuration the first group of one or more wheels and additionally a second group of one or more wheels are arranged for propulsion by the drive train.

A military vehicle includes a cabin. The cabin includes a bottom assembly and a foldable top assembly. The bottom assembly is configured to receive and removably couple with different top assemblies. The foldable top assembly is configured to transition between a folded position for a low velocity aerial drop (LVAD) and a deployed position. The foldable top assembly includes a torsional spring configured to provide a torque to assist transitioning of the foldable top assembly from the folded position to the deployed position.

The application provides a multi-mode head position measurement method and device, electronic equipment and storage medium, the method comprises: the plurality of servo cylinders arranged at intervals are all taken as first controlled objects, and a first control instruction is generated for each first controlled object; the first current motion information of each first controlled object is determined in real time respectively; in the case that the first current driving force corresponding to the first current force parameter reaches the corresponding first limit driving force, the first current position is taken as the first limit position of the first controlled object. Through the technical scheme provided in the embodiment of the application, the first controlled object runs at a lower speed under the limitation of a smaller limit driving force, and when reaching the first limit position, it will not cause a larger kinetic energy impact and a larger pressure on the coating machine and other equipment; and the position of the plurality of servo cylinders is measured at the same time, and the efficiency is higher.

The application relates to a motor control method applied to a rivet production, which comprises the following steps: firstly, the relationship curve between the torque and the speed of the motor is obtained from the mechanical characteristics of the motor, and the optimal acceleration control curve is determined; secondly, the motor is adjusted to the speed control mode, the position of the motor is controlled to the pre-detection position based on the optimal acceleration control curve; the speed of the motor is adjusted to a lower speed, the load torque of the motor is observed by using the observer method, and whether the rivet exists and is qualified is detected according to the size of the load torque; finally, the rivet and the sheet metal part are riveted until all the stations complete the riveting. The riveting speed of the application can normally break through the rated speed of the motor, the riveting efficiency is high, the rivet without the rivet and the unqualified rivet can be detected without additionally increasing the torque sensor and the displacement sensor, the detection cost is low, and in general, the application has high work efficiency and high cost performance.

The utility model relates to the technical field of tires, and discloses a run-flat and mute cotton integrated tire which comprises a tire body, triangular annular air bags are inserted into the left side and the right side of the interior of the tire body, and a layered inner tire is inserted into the upper side of the interior of the tire body; the arc-shaped supporting plate is inserted into the upper side of the inner side of the tire body, and anti-skid grains are arranged on the outer side of the tire body. According to the run-flat and mute cotton integrated tire, the triangular annular air bags are additionally arranged on the left side and the right side in the tire body, so that after the tire loses air pressure, compared with a mode that high-strength rubber is additionally arranged on the tire side, additional structural support can be provided, the shape of the tire is helped to be maintained, and tire deformation caused by insufficient air pressure is reduced; therefore, under the support of the triangular annular air bag, the tire can continuously bear the vehicle for a period of time at a lower speed even under the condition of no air pressure, and the use quality of the run-flat tire is improved.

A position control device for controlling the position of a control object is configured to successively calculate a velocity command value (V) and a torque command value (τc) based on a position command value (Pos_ref) and a position detection value (Pos); to determine, based on the velocity command value (V) calculated from the position command value (Pos_ref), whether the control object is operating at a constant velocity in a very low velocity range, where the velocity of the control object is within a velocity range less than or equal to a predefined threshold value (Vth);and subsequently, in response to determining, based on an acceleration command value (A), that the controlled object is operating at a very low, constant speed, to add a friction compensation amount (τs) to compensate for friction generated in the very low, constant speed operation to the torque command value (τc) and / or the velocity command value (V) and / or the position command value (Pos_ref).

The application provides a hydraulic transmission bulldozer reversing control method and a bulldozer, and belongs to the field of bulldozer control. The technical scheme is as follows: a hydraulic transmission bulldozer reversing control method comprises the following steps: when the speed gear of the target driving gear is higher than the speed gear of the current driving gear, the direction gear is switched first, and then the speed gear is raised to the speed gear of the target driving gear; when the speed gear of the target driving gear is lower than the speed gear of the current driving gear, the current speed gear is lowered to the speed gear of the target driving gear, at this time, the direction gear remains unchanged, and then the direction gear is switched; when the speed gear of the target gear is equal to the speed gear of the current gear, the direction gear is directly switched. In the scheme, the driver only needs to directly operate the reversing gear, and then the bulldozer automatically reverses through gear judgment, so that the operation process is simplified, and the bulldozer always operates at a lower speed gear when reversing, so that the gear impact is reduced.

Dynamic ram accelerator operation permits operation with lower acceleration, permitting launch of acceleration sensitive payloads such as crewed vehicles. Operational cost is reduced, and reliability improved, by reducing or eliminating internal consumable parts. Relative motion between a projectile and propellant at entry to the ram accelerator enables initial ram combustion at relatively lower velocity. Valves may maintain separation between sections within the ram accelerator that contain different propellant compositions. Timing of valve opening and closing is coordinated to provide conditions suitable for ram combustion. Control over propagation speed of propellant within the system may be obtained using one or more of baffle shape, baffle spacing, propellant temperature, propellant pressure, propellant mixture, temperature of components such as baffles, and so forth. Before the projectile is launched, internal separators between sections are removed, providing an open path to the ram accelerator exit.

A shock absorber (D) comprises a cylinder (1), a piston rod (2), a piston (3) connected to the piston rod (2) and dividing the interior of the cylinder (1) into a rebound-side chamber (R1) and a compression-side chamber (R2), an outer tube 4 forming a reservoir (R) between the outer tube (4) and the cylinder (1), a rebound-side main valve (7), a compression-side main valve (11) and a compression-side auxiliary valve (13) arranged in series between the compression-side chamber (R2) and a reservoir (R), and a rebound-side auxiliary valve (12) and a suction check valve (14) arranged in series between the reservoir (R) and the compression-side chamber (R2), wherein a damping force is generated by the rebound-side auxiliary valve (12) only when the piston velocity during a rebound operation is in a very low velocity range.and a damping force is generated by the compression-side auxiliary valve (13) only when the piston speed during a compression operation is in the very low speed range.

The invention discloses an intelligent decision-making method based on multi-modal projectile velocity measurement data, and relates to the technical field of projectile velocity measurement, and the method comprises the steps of module deployment initialization, environment collection, synchronous triggering, adaptation degree calculation, weight fusion, error correction and decision-making storage. The method has the advantages that by deploying the multi-modal speed measurement module and the environment perception sub-module integrated with the multi-parameter detection function, the pre-trained environment-modal adaptation degree model is called to calculate the adaptation degree of each module and generate the dynamic priority list, and the data fusion weight is dynamically allocated according to the priority; the weight of an abnormal module is adjusted in combination with environmental interference conditions, and errors are compensated based on historical data of similar scenes; the defects that in the prior art, a single speed measurement module is difficult to adapt to complex environments and bullets with different attributes, data fusion weight fixing lacks scene pertinence, and error correction has no accurate basis, so that the speed measurement precision is low and the decision is unreliable are effectively overcome.

The utility model relates to the technical field of die casting, and discloses an injection system and a die casting machine, the injection system comprises: a housing, which is provided with a chamber capable of accommodating molten metal, and the upper end of which is provided with a cover plate; the two ends of the U-shaped pipe are arranged on the cover plate, the middle of the U-shaped pipe extends into the shell, one end of the U-shaped pipe is a discharging port, and a feeding hole located in the molten metal is formed in the U-shaped pipe; one end of the charging valve is connected to the feeding hole; the pressurizing device is arranged at the other end of the U-shaped pipe in a sealed mode and can inject gas into the U-shaped pipe. The injection system is arranged in the die-casting machine, and during die-casting operation, molten metal can be supplied into a die at a low speed, so that bubbles in the molten metal are effectively reduced, and the casting quality of a large thick-wall structural part is guaranteed.

The present application aims at the problem that the star-sealing contactor is limited by the capacity of the contactor itself in controlling the overspeed of the elevator, and cannot provide enough torque to reduce the elevator to a lower speed, and proposes an elevator control method, which comprises an electronic star-sealing device and a mechanical star-sealing device, and comprises an elevator normal parking control method and an elevator fault parking control method, and the present application utilizes the cooperation of the electronic star-sealing device and the mechanical star-sealing device and the optimization of the control method, the mechanical star-sealing device of the present application is small in selected capacity and saves cost; the electronic star-sealing process can avoid the module damage caused by the too large impact current in the electronic star-sealing process, and the elevator can be more safely electronically star-sealed.

This utility model proposes a masterbatch loading mechanism, comprising: a shell with an internal cavity, in which a partition plate is fixed, dividing the cavity into a discharge chamber and an installation chamber; a discharge pipe fixed to the lower end of the shell, having a discharge channel communicating with the discharge chamber; a storage silo within the installation chamber, with a feed hopper on the top plate of the shell for conveying masterbatch into the storage silo, and a discharge port at the lower end of the storage silo; and a screw feeder mounted on the bottom plate of the shell, with its inlet located within the installation chamber and communicating with the discharge port of the storage silo; and its outlet located within the discharge chamber. In this design, the masterbatch flows out of the screw feeder at a very low velocity, effectively reducing wear from collisions between the masterbatch and the inner wall of the discharge chamber, thus reducing dust and improving safety.