45results about How to "Guaranteed to follow" patented technology

The invention aims at providing a slide vane compressor. The problem that backpressure oil supplying of an existing slide vane compressor is not stable is mainly solved. According to the technical scheme, negative pressure is generated in a main oil way in a spindle through a fan, and then an upper oil tube assembly is used for pumping oil from an oil pool; a backpressure oil tank is communicated with the main oil way, and the main oil way supplies pressure oil to the backpressure oil tank. Through the arrangement, oil supplying of the backpressure oil tank is more stable and reliable.

The invention relates to an unmanned vehicle path following method based on event-triggering model prediction control. The method comprises the steps that a nonlinear kinematic model of a vehicle is established; unmanned vehicle kinematic global coordinate position information is collected and transmitted to a controller of the vehicle; an event triggering mechanism is designed, an optimization problem is solved to perform redundancy elimination processing, and whether a control strategy of the vehicle is updated or not is decided; and a model prediction controller solves an optimal control strategy by use of the position information in combination with state constraint and input constraint in a vehicle global coordinate system. According to the method, the event triggering mechanism is introduced, and it can be guaranteed that following to a reference path is guaranteed while the calculation amount is reduced; and compared with traditional periodical sampling control, an action is done only at the occurring moment of a determined event, for example, an error exceeds a threshold or a specific moment is reached, according to the event triggering mechanism, path following control isrealized, and meanwhile the calculation amount is greatly reduced.

The invention relates to a mechanical sealing device with an axial adjusting function for a large-sized dredger sludge pump. The mechanical sealing device comprises a seal tank connected with the sludge pump in a sealed mode, as well as a moving ring seat provided with a moving ring and a static ring seat provided with a static ring in the seal tank, wherein a push ring is arranged between the static ring seat and the seal tank; the moving ring seat is in fastened connection with a shaft sleeve via a fastening bolt, and rotates together with a pump shaft; an external adjustable static ring axial compensation mechanism is arranged on the outer end face of the seal tank; the external adjustable static ring axial compensation mechanism comprises a gland arranged at the outer end of the seal tank, and the gland is connected with the outer end face of the seal tank; an adjusting gasket is arranged between the gland and the outer end face of the seal tank; and static ring compensation assemblies are uniformly distributed in the circumferential direction of the outer end face of the seal tank. The mechanical sealing device is used for solving split and integrated mechanical sealing; and the working height of a spring is not changed with the adjustment of a pump body in installation and use processes, and the damaged spring element can be replaced timely without detaching equipment, so that the performance stability and reliability of user equipment are guaranteed, and the service life of the sealing device is prolonged.

The invention relates to an automatically-operating loading trolley, and particularly relates to a loading following trolley, which comprises a trolley body. The upper part of the trolley body is provided with a loading platform; the bottom part of the trolley body is provided with wheels; the trolley body is provided with a control module, sensor modules, a power module, a power supply module and a display; and the control module is respectively connected with the sensor modules, the power module, the power supply module and the display via lines. The loading following trolley has tracking, loading and remote control functions, warning is given when tracking fails, in combination with the functions, a heavy object can be placed on the trolley, the trolley can follow the person to move, and load of travelling is greatly lessened; and by using the remote control function, the heavy object can be remotely controlled to be transported to a designated place, and carrying by the user is not needed.

The invention discloses a device and method for measuring a three-dimensional space flow field in a sub-span wind tunnel. Firstly, a tracer particle spreader for spreading tracer particles are connected with a high-pressure air source, the tracer particles are placed in the spreader, and since the tracer particle spreader is connected with the high-pressure air source through a pipeline, the spreading density of the tracer particles is adjusted by adjusting the pressure of the high-pressure air source; four cross-frame CCD cameras are equipped with anti-focal-length perspective control lensesto shoot the flow field, so that clear imaging of a three-dimensional space is ensured; by utilizing lasers, three-dimensional space illumination of the flow field is carried out through the assembledbody light source; a synchronous controller sends out a trigger signal to control synchronous work of the cameras and the laser, and the pressure of the high-pressure air source is adjusted; and after tracer particles in a test area meet the requirements, flow field images are collected through all the cameras, the flow field images shot by the four cameras are reconstructed, and a three-dimensional space flow field of the test area is obtained.

A longitudinal speed trac control method and a device for an expected path vehicle, belongs to the field of driverless vehicle control, In order to solve the problem of longitudinal speed tracking control of vehicles on expected path, the total drive torque is calculated and distributed to the drive torque of each hub motor by a torque distribution controller, the output torque of the hub motor acts on the wheels, The longitudinal speed control is used to track the desired trajectory, in which the tire utilization rate is used as the optimization function, and the moment distribution algorithmis designed according to the pseudo-inverse method to distribute the total moment. The effect is to ensure that the tire is in the stable range without exceeding the adhesion limit, and the requiredprecision of the distribution is higher, so that the longitudinal speed tracking is more accurate.

The invention discloses an acceleration-based follow-up vehicle control method, which relates to the technical field of intelligent control, and comprises the steps of: 1, setting a safety distance Lsof a base station of a follow-up vehicle and a target tag, a maximum speed Vmax of the follow-up vehicle, and a time shortening amount Tv of shortening the distance between the base station of the follow-up vehicle and the target tag to the safety distance Ls, and initializing an acquisition number i=0; 2, setting i=1, and acquiring a current speed of the follow-up vehicle after a time interval Delta Ti; 3, setting i=i+1, acquiring a current speed Vt of the follow-up vehicle after the time interval Delta Ti and acquiring a distance Li between a current base station of the follow-up vehicle and the target tag; 4, calculating current acceleration An of the follow-up vehicle according to the current speed Vt of the follow-up vehicle after the time interval Delta Ti and a speed of the follow-up vehicle after the time interval Delta Ti-1; 5, calculating estimated acceleration Am of the follow-up vehicle according to the distance Li, the safety distance Ls, the current speed Vt and the timeTv; 6, controlling a motion state of the follow-up vehicle according to the Am, An, Vt, and Vmax; 7, and repeating the steps from 3 to 6.

A method for total drive torque output of an unmanned vehicle, belongs to the field of driverless vehicle control, In order to solve the problem of the accuracy of the total drive torque output of theunmanned vehicle, the main point is to take the error between the ideal longitudinal speed and the actual longitudinal speed and the error rate of change as the input of the controller, The controller outputs the electronic throttle opening and searches for the hub motor torque map corresponding to the electronic throttle opening prepared in advance to output the total driving torque of the vehicle. The effect is to ensure the following performance of the longitudinal speed of the vehicle and provide the accurate total torque for each wheel to distribute torque.

The invention discloses a microleakage device and a common rail tube. The microleakage device comprises a valve seat, wherein a valve seat oil channel is formed in the valve seat, the valve seat is provided with an oil inlet and an oil return opening which communicate with the valve seat oil channel, a valve core and a first limiting structure are arranged in the valve seat, the valve core and thevalve seat are in clearance fit with each other, the clearance between the valve core and the valve seat respectively communicate with the air inlet and the air return opening, two ends of the valvecore are respectively a first end of the valve core and a second end of the valve core, and in the flowing direction of fuel oil, the first end of the valve core is located on the upper stream of thesecond end of the valve core, and the second end of the valve core is abutted against the first limiting structure. The microleakage device is added on the common rail tube, and when rail pressure isexcessively high, releasing of the rail pressure is performed through the microleakage device, the excessively high part of the rail pressure is released, following performance of actual rail pressureand set rail pressure of an engine is enabled to be good, and the problem that a microleakage oil sprayer is poor in rail pressure following performance is solved.

The invention relates to a wading boot special for flood-fighting and emergency rescue. The wading boot special for flood-fighting and emergency rescue is characterized in that a treading type ventilation air bag is arranged in a rubber high-waist wading boot body and is located at the position of the heel, an air outlet and an air inlet are formed in the ventilation air bag, an exhaust ball valve with a spring is arranged at the position of the air outlet, an air inlet valve block is arranged at the position of the air inlet of the ventilation air bag, one end of an exhaust pipe stretches into the ventilation air bag from the rear heel of the high-waist wading boot body and is connected with the air outlet of the ventilation air bag, the other end of the exhaust pipe extends upwards to the uppermost end of the boot waist from the rear outer side of the surface of the boot waist after passing through the waterproof boot waist, and the exhaust pipe is fixed to the surface of the waterproof boot waist through a pipe fastener. According to the wading boot special for flood-fighting and emergency rescue, moisture in the boot can be discharged automatically, the situation that the boot is separated from the foot can be avoided, it is guaranteed that the boot is in close fit with the foot, the waterproof height of the wading boot is greatly increased, and water can be effectively prevented from entering the boot. The wading boot is quite suitable for flood-fighting and emergency rescue and can also be widely applied to mole drainage, underground coal mining, work of fisherman and work in paddy fields.

The invention provides a charging transaction management method. The method comprises the following steps of completing a charging transaction via a plurality of charging piles, wherein the transaction of the charging piles generates transaction data including the user information and accounts, and selecting a plurality of supervising roles from the user according to the transaction data, whereinthe supervising roles record the transaction data, and the rewards or penalties are made according to the work of the supervising roles. The data in the transaction process is digitally managed, the charging transaction of the electric vehicle is promoted, and each party can conveniently and effectively complete the electric quantity transaction.

The invention relates to a PWM pulse width dynamic adjustment and neutral point balance method based on a current observer, and the method is technically characterized in that a current fundamental component is extracted through current observation, the dynamic adjustment time and the steady-state adjustment voltage are calculated, the adjustment output level time is calculated through neutral point balance, and the adjustment output level time and the dynamic adjustment time are input to the pulse width adjustment to complete the adjustment of the PWM pulse width. The problems that PWM response lags behind in existing conventional table look-up control, current coupling and disorder exist in the adjusting process, harmonic waves are increased and the like are solved, the advantage that the current harmonic waves of an optimized PWM table look-up method are low is reserved, meanwhile, the defect of an existing neutral-point balance technology is overcome, the limitation that common-mode component adjustment must be used is broken through, and the problems of insufficient adjustment capability and poor real-time performance caused by limitation of zero-sequence voltage adjustment in an existing method are solved.

The invention relates to the technical field of additive manufacturing, in particular to a piezoelectric actuating type accompanying hammering strengthening device and method for electric arc additive manufacturing, and the device comprises an accompanying gear transmission system and a piezoelectric hammering head; the following gear transmission system comprises an inner gear, a machine base, a hollow fixed shaft system, a motor, an input shaft system and a planet carrier system. The base is used for supporting the motor; the motor is connected with the input shaft system; the input shaft system transmits the motion to the hollow fixed shaft system; the hollow fixed shaft system is connected with the planet carrier system; the planet carrier system is in meshed connection with the inner gear through a gear; the piezoelectric hammering head system is vertically connected to the lower portion of the planet carrier system and right faces the weld joint, and the piezoelectric hammering head system rotates around the welding gun in a whole circle when rotating along with the planet carrier system. According to the invention, the whole-circle position control of the piezoelectric hammering head around the fixed hollow shaft can be realized, and the device has the advantages of accurate hammering force control, high hammering frequency and small structural size.

The invention relates to an intelligent stage system based on multidirectional force measurement. The system comprises a plurality of stage modules, a stage follow spotlight, a support and a PLC device. The stage modules form a whole stage, the stage module comprises a plurality of friction force detection chips and a plurality of pressure detection chips, the friction force detection chips are arranged on the surface layers of the stage modules, the pressure detection chips are arranged on the lower layers of the friction force detection chips, the PLC device is connected with the friction force detection chips, the the pressure detection chips and the stage follow spotlight, the pressure detection chips are correlatied, the pressure detection chip is provided with a first pressure indication module and a second pressure indication module, the first pressure indication module and the second pressure indication module alternately flicker, the pressure detection chip is used for detecting the pressure position, the friction force detection chip is used for detecting the stage surface friction force, the friction force detection chip is used for detecting the moving direction of a stage performance personnel, and the PLC device controls the stage follow spotlight according to the moving direction of the performance personnel detected by the friction force detection chip.

The invention relates to a solid tracer particle generator. The solid tracer particle generator comprises a connecting flow channel and a combustion frame. A hollow combustion cavity is formed in theconnecting flow channel and can be connected to the experiment flow channel in series, and then experiment fluid in the experiment flow channel is allowed to flow through the combustion cavity. The combustion frame is arranged in the combustion cavity and can bear fuel, and tracer particles generated after the fuel is ignited can be mixed with experimental fluid in the experimental flow channel and move along with the experimental fluid. The invention further relates to a flow field measuring device comprising the solid tracer particle generator. According to the solid tracer particle generator and a flow field measuring device, the whole generation process of the solid tracer particles is completed in the experiment flow channel, fuel can be combusted with air in the experiment flow channel to generate the solid tracer particles in the experiment process, additional gas flow does not need to be added, control over the experiment fluid flow is facilitated, and the fluid following performance of the solid tracer particles is guaranteed.

The invention relates to a multidirectional intelligent control system for follow spotlights on stages. The system comprises a pressure module, a coordinate module and a device module, wherein the pressure module comprises a plurality of stage component modules, pressure sensing chips and a plurality of first signal emitters; the surfaces of the stage component modules are square; the pressure sensing chips are arranged at the centers, four apex angles and four edge midpoints of the stage component modules; in the same component modules, the pressure sensing chips can be repeatedly and virtually connected in pairs; the first signal emitters are arranged at the virtual connection midpoints of the pressure sensing chips; the first signal transmitters are respectively connected with two pressure sensing chips; the coordinate module comprises a first positioning sensing chip, a microphone device and a second signal emitter; the second signal emitter and the first positioning sensing chip are arranged on the microphone device; the first positioning sensing chip is used for positioning the microphone; and the second signal emitter is used for sending the positioning of the first positioning sensing chip.