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507results about How to "Avoid imbalance" patented technology

Intelligent pesticide application unmanned helicopter

The invention provides an intelligent pesticide application unmanned helicopter and belongs to the technical field of agriculture. The unmanned helicopter comprises a helicopter body frame, wherein the helicopter body frame is provided with a rotary wing flight system and a undercarriage component which are controlled by a flight control main engine; the communication end of the flight control main engine is communicated with a global position system (GPS), the master control output end of the flight control main engine is connected with the controlled end of the rotary wing flight system and is used for sending a navigation control signal to the flight system according to a contemplated route and real-time position information transmitted from the GPS; the central part below the helicopter body frame is also provided with a pesticide application device consisting of a pesticide chest, a liquid pump, a spray beam and a spray nozzle; the liquid outlet of the pesticide chest is communicated with the spray beam with the spray nozzle through a liquid infusion pipeline and the liquid pump; the flight control main engine also comprises an auxiliary control output end; and the auxiliary control output end is connected with the controlled end of the liquid pump and is used for sending a pesticide application control signal to the liquid pump according to the preset pesticide application sites and the real-time position information transmitted from the GPS. The unmanned helicopter can realize automatic navigation flight and can automatically control the pesticide application operation.
Owner:NANJING AGRI MECHANIZATION INST MIN OF AGRI

Test device and test method for testing delivery capacity of steam security valve

The invention relates to a test device and a test method for delivery capacity of a steam security valve based on system dryness control. The test device is mainly composed of a concurrent boiler, a steam separator, an energy storage and a test vessel through connecting in sequence. The test method for the delivery capacity of the steam security valve includes: regulating the opening degree of a regulating valve on a steam header to stabilize the steam pressure at a boiler outlet to avoid the unbalance between the steam supply amount of the boiler and the pressurization desired steam amount of the energy storage when testing different sizes of security valves; regulating the opening degree of a regulating valve between the energy storage and the test vessel to realize the stable discharge of the measured steam security valve; when testing the delivery capacity of the security valve, enabling the boiler to continuously supply gas for the energy storage system under pressure control so as to maintain enough pressure for the energy storage in testing, and accordingly the energy storage volume is reduced, and the device constructing cost is lowered; regulating the load of the concurrent boiler to change the overheat degree of the steam at the boiler outlet so as to meet the steam quality requirement in testing the delivery capacity. The test device and the test method have advantages of strong operating flexibility, stable system running and high testing precision.
Owner:EAST CHINA UNIV OF SCI & TECH

Method and device for measuring stator resistance and temperature detection method and device

The invention discloses a method for measuring stator resistance of a motor. The method comprises the following steps that the angle of a current vector function is obtained; the motor is controlled to operate in a current closed-loop mode according to a first d-shaft current applied to a shaft d of the motor to obtain a first steady voltage command of the motor; the motor is controlled to operate in a current closed-loop mode according to a second d-shaft current applied to the shaft d to obtain a second steady voltage command of the motor; the stator resistance of the motor is calculated according to the first d-shaft current, the second d-shaft current, the first steady voltage command and the second steady voltage command. The method can accurately measure the stator resistance of the motor, measurement precision of the stator resistance is greatly improved, and therefore temperature detection precision of the motor can be improved. The invention further discloses a temperature detection method of the motor, a device for measuring the stator resistance of the motor, a temperature detection device of the motor and a motor control system with the device for measuring the stator resistance of the motor or the temperature detection device.
Owner:GUANGDONG WELLING ELECTRIC MACHINE MFG +1

Data center system and management method for data center system

The invention provides a data center system and a management method for the data center system. In the data center system formed by a continuous communication network user, multiple data center sites, an instruction department and multiple site agency departments, when the user sends an application request to the instruction department, the instruction department estimates resources needed for running of the application requested by the user according to resources needed by applications of all types, electric power cost and bandwidth cost for running the application requested by the user at the data center sites are calculated according to resource usage conditions of all the data center sites and the estimated needed resources, the instruction department sends an application running request to the site agency department of the data center site with the lowest sum of the electric power cost and the bandwidth cost for running the application requested by the user, and the site agency department receiving the application running request allocates applications requested to run to a server managed by the site agency department. Thus, imbalance generated due to respective optimization of the electric power cost or the bandwidth cost is avoided, and the total operating cost of data centers is further reduced.
Owner:HITACHI LTD

Bi-directional DCDC converter

The invention provides a bi-directional DCDC converter. The bi-directional DCDC converter comprises a transformer, an inductor, a diode, a relay, a controller, a current detection module, a voltage detection module and a field-effect tube, wherein the current detection module is connected with an external first direct-current voltage, and the current detection module is connected to the transformer by virtue of the field-effect tube; the transformer is connected with the relay, and the transformer is connected to an external second direct-current voltage by virtue of the field-effect tube; the second direct-current voltage is connected to an alternating-current load by virtue of an inverter; the relay, the current detection module, the voltage detection module and the field-effect tube are connected with the controller; when direct-current power is transferred by the second direct-current voltage to the first direct-current voltage, the relay is controlled to be turned off, and the pulse width of a PWM signal transmitted by the second direct-current voltage is adjusted; when the direct-current power is transferred by the first direct-current voltage to the second direct-current voltage, the relay is controlled to be turned on, and the pulse width of a PWM signal transmitted by the first direct-current voltage is adjusted.
Owner:SHENZHEN KSTAR SCI & TECH

Positive-displacement compressor MVR heat pump evaporation system with adjustable pressure ratio working condition

ActiveCN104069642AAvoid system imbalanceEliminate superheatEvaporator accessoriesEvaporators with horizontal tubesCondensed waterEngineering
The invention relates to the industrial evaporation field, and especially relates to a positive-displacement compressor MVR heat pump evaporation system with an adjustable pressure ratio working station. The system is composed of a feed pump, a preheating device, a hierarchical evaporator, a positive-displacement water steam compressor, a separator, a condensation water tank, and a discharge pump; and the condensed water in the hierarchical evaporator bottom can be used for the secondary preheating on the fresh material liquid. The technical scheme mentioned above has the following advantages: (1) the solution evaporation parameters can be stably controlled, the condensed water stored in the preheating device and the hierarchical evaporator bottom can be used to preheat the fresh solutions in different levels so as to raise the solution temperature to the evaporation temperature before the solution enters the evaporation liquid room of the hierarchical evaporator, and thus the system unbalance caused by the temperature fluctuation of feed material is avoided; (2) a high-temperature water spraying mode and a low-temperature water spraying mode are adopted on the positive-displacement water steam compressor, thus the residual heat of condensed water can be fully utilized, the water amount can be adjusted at the same time, the actual pressure ratio of a positive-displacement water steam compressor can be adjusted, and the goal of adjusting the pressure ratio working conditions is achieved.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Ecology and environment-friendly soil improvement agent and preparation method thereof

The invention discloses an ecology and environment-friendly soil improvement agent, which is prepared from the following raw materials in parts by weight: 15-25 parts of ore soil filler, 7-11 parts of coal gangue, 8-10 parts of straw, 10-20 parts of mixed grass meal, 3-5 parts of compound microorganisms, 5-7 parts of humate, 8-12 parts of excrement of livestock, 4-6 parts of desulfurized gypsum, 6-8 parts of bamboo charcoal powder and 5-7 parts of trace element additives. The soil improvement agent provided by the invention can effectively overcome the imbalance of nutrient elements in soil, improve soil fertility, loosen the soil, improve fertilizer efficiency, increase the contents of organic matters and nutrients, loosen hardened soil, accelerate a process of raw soil ripening and improve or recover land productivity; furthermore, industrial and agricultural wastes are used as most of the raw materials, so that the soil improvement agent is environmentally-friendly and safe; furthermore, the preparation method provided by the invention is lower in material cost, easy in obtaining of raw materials, simple in technology and easy to operate and in realization of industrial production, thus having higher practical value and a good application prospect.
Owner:合肥市风达农业有限责任公司
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