95results about How to "Realize automatic balance" patented technology

A method for determining a fluid flow rate with a fluid control valve utilizes inherent characteristics of a particular valve in conjunction with easily measured parameters in order to determine a flow rate through the valve. A valve flow characteristic equation, a flow coefficient, and a rangeability for the valve are known and hardcoded into a chipset that controls the valve. A differential pressure transducer measures the pressure drop across the valve. A valve actuator controls the valve opening fraction. The differential pressure transducer and the valve actuator provide feedback signals to the chipset. The known and measured parameters are used to calculate an instantaneous valve characteristic and a fully-open flow rate for the valve. The instantaneous flow rate through the valve is then calculated from the instantaneous valve characteristic and the fully-open flow rate.

The invention discloses a coal-pillar-free self-forming roadway balanced mining design method and system. The method comprises the following steps of obtaining a rock mass fragmentation and expansion coefficient through a rock mass fragmentation and expansion function equation; based on the rock mass breaking and expanding coefficient, the roof cutting height enabling a stope to achieve breaking and expanding balance is obtained through a stope breaking and expanding control equation; a series of indoor tests are utilized to obtain roof stratum friction coefficients, and the roof cutting angle is obtained when the stope roof caving resistance is minimum through kerf surface friction comparison; and self-forming roadway support balance parameters are obtained, the roof cutting height, the roof cutting angle and the self-forming roadway support balance parameters are verified to obtain balance mining design parameters, and finally a coal-pillar-free self-forming roadway balance mining solution is formed. According to the coal-pillar-free self-forming roadway balanced mining design method and system, the breaking and expanding parameters, the top cutting parameters and the supporting parameters can be accurately calculated, and the accurate coal-pillar-free self-forming roadway balanced mining solution is formed.

The invention relates to a valve control method, in particular to a remote valve control method which is used in a central air conditioner system for storing energy and combining terrestrial heat. A central air-conditioner has the functions of multi-mode automatic switching control, dynamic flow balance control and room constant temperature control through adopting a programmable controller with high mathematical function calculating function, an electric executer and a plurality of valves and acquiring information of parameters of controlled objects of all places in the air conditioner system. The method can be applied to the central air conditioner system with an energy storage water tank and is especially suitable for the central air conditioner system for storing the energy and combining the terrestrial heat. The valves are independently controlled dynamically by using the programmable controller so as to directly realize the automatic balance of the dynamic flow and further realize the room constant temperature control of the central air conditioner. When the valve control method is adopted, the air temperature fluctuation value of a user end is 40-90 percent less than that calculated in the traditional valve control method, and the comprehensive energy consumption of the central air conditioner system is saved 8-33 percent than that adopted in the traditional valve control scheme.

The invention relates to a method used for adjusting three-phase unbalance of a zone area. According to the method, a three-phase balance adjustment concentrator is mounted beside a distribution part, and a tower pole having access wires is selectively equipped with multiple three-phase balance adjustment switches according to a load situation; the real-time data is analyzed and determined by the three phase balance adjustment concentrator, a distribution transform three-phase load unbalance degree reaches above 15% and continues five minutes, statistics of a combination result of all switch loads on a largest load phase is carried out, an unbalance degree after assumed phase change is calculated, an instruction is emitted to the corresponding switch on the largest load phase after optimal taking, loads are driven by the multiple three-phase balance adjustment switches to realize switching from present phases to target phases without power failure, and thereby three-phase automatic adjustment is realized. Through the method similar to a manual mode, work intensity of onsite workers can be effectively reduced, work efficiency is improved, line loss is reduced, great importance for prolongation of distribution transform service life is realized, and electrical appliances are made to realize safe and reliable operation.

The invention relates to a control system and method for a helicopter electrically-driven tail rotor. The control system comprises a pedal, an angular displacement sensor, a helicopter controller, a motor controller, a driver for a tail rotor driving motor, a motor driver of a tail rotor variable pitch structure, a detection unit, a gyroscope, a motor-reducer integrated structure capable of driving the tail rotor to rotate, and an electrically-driven variable pitch structure. By use of the control method, according to a pedal angle change and a helicopter tail gesture change of gyroscope detection, the revolving speed of the tail rotor driving motor is automatically controlled, and a variable pitch structure is regulated so as to realize the balance or the diversion of the helicopter. Theinvention provides the control system and method for the helicopter electrically-driven tail rotor, and replaces the internal combustion engine driving and the excessive transmission shaft of a traditional helicopter, so that the quick and stable automatic balance and diversion of the helicopter can be realized, operation difficulty is reduced, and reliability and stability are enhanced so as to be favorable for accelerating the technology of an electric helicopter to be progressed and developed.

The invention discloses a direct-current solid-state transformer with bipolar output voltage self-balancing capability, and belongs to the field of power electronic technology and direct-current powertransmission and distribution. A high-voltage side direct-current bus capacitor, a first bridge arm and a second bridge arm are connected in parallel between the anode and cathode of a high-voltage direct-current bus; a low-voltage side split direct-current bus capacitor, a load, a third bridge arm and a fourth bridge arm are connected in parallel between the anode and cathode of a low-voltage direct-current bus; a high-voltage side circuit is provided with an output end; a low-voltage side circuit is provided with an input end; a resonant cavity is provided with a high-voltage side and a low-voltage side; the output end is connected with the high-voltage side; the input end is connected with the low-voltage side; one end of a balance inductor L1 is connected with an input end g; one endof a balance inductor L2 is connected with an input end f; and the other end of the balance inductor L1 is connected with the other end of the balance inductor L2 and connected with the low-voltage side split direct-current bus capacitor. The topology of the invention directly outputs bipolar direct-current voltage; bipolar direct-current output can be realized without constructing a voltage balancer by an additional switching device, so that cost is saved.

The invention discloses a tower-type slag granulation steam-recovery unit, comprising a tower-type shell, wherein the bottom of the shell is provided with a steam drainage tube; a spray washing unit, a front-section steam-water separator, a mixer, a back-section steam-water separator, an air blower and a steam discharge tube are sequentially arranged above the steam drainage tube in the longitudinal direction of the tower-like shell; and an air window is arranged on a wall of the tower-like shell between the front-section steam-water separator and the mixer. In the tower-type slag granulationsteam-recovery unit, a cold air cooling steam mode is adopted except a spray washing mode. Compared with a water cooling steam mode, the cold air cooling mode is adopted, thus the implementation costis lower, the wastes of water resources are avoided, and the recovery of steam condensates is realized beneficially. In the tower-type slag granulation steam-recovery unit, a mode that the water carried in steams is separated independently is adopted and the front-section steam-water separator, the mixer and the back-section steam-water separator as well as the air blower which are sequentially arranged are utilized, thus the coordination effects and the separation effects are good.

The invention provides a leveling device of a vibrating seed disc of an air vibration disc type seedling seeder and a balance control method, and belongs to the field of agricultural intelligent equipment. The leveling device comprises a rack, the vibrating seed disc, an inclination angle detection platform, an amplitude-adjustable eccentric connecting rod mechanism and a servo electric cylinder,wherein the vibrating seed disc is subjected to amplitude adjustment through the amplitude-adjustable eccentric connecting rod mechanism, and a vibrating seed disc supporting table fixed to the lowerend of the vibrating seed disc is fixed to the inclination angle detection platform provided with a double-shaft inclination angle sensor through a spring; and the inclination angle sensor collects the inclination angle of the inclination angle detection platform and sends the inclination angle to a main control unit, after processing, pulses are output to drive the servo electric cylinder througha servo motor driver, leveling of the inclination angle detection platform is completed, and therefore, the vibrating seed disc is leveled. Different amplitudes of different seeds can be adjusted, and the uniformity of the population boiling effect and the seed suction rate and the seeding effect of the air vibration disc type seedling seeder are improved.

The invention provides a same-frequency displacement self-adaptive filtering automatic balancing magnetic levitation rotor system, which comprises a same-frequency displacement adaptive filter, a feedforward compensator, a controller, a power amplifier, an electromagnet, a rotor and a displacement sensor, wherein the rotor displacement signal is accurately divided into a displacement signal with the same frequency with the rotational speed of the rotor, and a displacement signal not at the same frequency with the rotational speed of the rotor through the same-frequency displacement adaptive filter, with the latter sent to the controller while the same-frequency current rigidity force is ensured to be zero, and the former sent to the feedforward compensator to eliminate the same-frequency displacement rigidity force; and the displacement signal with the same frequency with the rotational speed of the rotor and the displacement signal not at the same frequency with the rotational speed of the rotor are combined to eliminate same-frequency magnetic axis bearing, thereby realizing automatic balancing of the rotor. According to the invention, aiming to the problem that the detection error of rotor rotational speed seriously affects the automatic balancing precision, the same-frequency displacement adaptive filter is adopted to evaluate and track the rotational speed of the rotor, and as a result, the detection precision of the same-frequency displacement signal is obviously improved, and the automatic balancing precision of the magnetic levitation rotor is greatly improved. Therefore, the system provided by the invention is simple, feasible, and particularly a practical magnetic levitation rotor system.

The invention belongs to the technical field of intelligent concrete pump truck control, and relates to a novel automatic pump truck balancing system. The system comprises a pump truck, a balance system processor, a gyroscope, a GPS module, a language broadcaster, a supporting leg oil cylinder, a supporting leg oil cylinder green light, a supporting leg oil cylinder yellow light, a supporting leg oil cylinder red light, an oil pipe pressure sensor, an oil pipe, a distance sensor, a hardness sensor, a data transmission bus and a network platform. Automatic balance of supporting legs can be achieved, and the problem that possibly due to the fact that the experience of a concrete pump truck operator is insufficient, the truck cannot be balanced and potential safety hazards are caused is solved.