39results about How to "Avoid large fluctuations" patented technology

A multicarrier communication apparatus capable of reducing an amount of information required for feedback, making a range of transmission power fluctuation small, and achieving rapid convergence on a target transmission power is disclosed. With this apparatus, subcarrier pair determination section (1142) puts a plurality of subcarriers contained in a multicarrier signal into pairs, notifies combining section (106) of information pertaining to the pairs of subcarriers, combines received power of each pair of subcarriers, and outputs combined received power obtained in this manner to command producing section (1146). Target power storage section (1144) stores target power for received power in such a manner that SIR at the subject apparatus becomes a desired SIR. Command producing section (1146) compares combined received power for the pairs of subcarriers and target received power, produces a command indicating a difference in power between these two received powers, and generates a control signal containing the produced command.

In a scroll compressor, a sliding direction of a Oldham coupling is defined such that an acting direction of an inertia force of the Oldham coupling is substantially opposite to an acting direction of a reaction force by gas compression, and thereby a range of fluctuation of a total torque of a first rotational torque acting on an orbiting scroll by the reaction force of gas compression and a second rotational torque of sliding movement of the Oldham coupling becomes smaller than that of the first rotational torque to suppress a noise and vibration caused by fluctuation of a rotational torque of the orbiting scroll without any limited designing of an involute shape thereof.

A method for calculating the supply-production balance speed of an electric submersible direct-drive screw pump production well, comprising steps: S1, calculating the initial supply-production balance speed; when the formation liquid supply is stable, calculating the initial supply-production balance speed that matches the current formation liquid supply Oil well supply-production balance speed; S2, calculation of supply-production balance speed during operation; when the formation liquid supply changes, monitor and calculate the dynamic fluid level of the oil well during the operation of the electric submersible direct drive screw pump at the initial oil well supply-production balance speed The fluctuation value of the initial oil well supply-production balance speed is adjusted to obtain the supply-production balance speed during operation. According to the formation liquid supply capacity of different oil wells, the present invention automatically and in real time adjusts the operating speed of the electric submersible direct drive screw pump unit, so that the oil wells can reach the balance of supply and production, ensure that the oil wells keep running within a reasonable flow pressure range, and avoid excessively high screw pump speeds. Causes problems such as screw pump emptying, dry grinding, motor burning caused by insufficient liquid supply of oil wells, and also avoids too low speed of screw pumps affecting the liquid supply of oil well formations.

The invention discloses a set of optimization control methods of an ethylene cracking furnace. The set of optimization control methods of the ethylene cracking furnace comprises the following steps of establishing a cracking depth model, implementing COT advanced control, optimizing key technology parameters, realizing integrated application, establishing a combustion chamber flame diagnostic system, and establishing a cracking furnace energy management system. By the adoption of the set of optimization control methods of the ethylene cracking furnace, efficiency of ethylene and propylene (or diene) is improved, and energy consumption of the ethylene cracking furnace is reduced. Optimization control over the realizing process reduces severer interference, caused by frequent manual operation, to the COT, the fluctuation amplitude of operation conducted when events, such as reduction of the fuel gas pressure and dryer switching occur is reduced, and therefore the level of the stableness rate of the COT of the whole device remains high. The cracking depth model of the cracking furnace is established, and operation conditions of different cracking working conditions are optimized, so that the yield of the diene is in a high level, and energy conservation and optimization of the cracking furnace are realized.

The invention discloses an automatic ignition control system and method for stove burning of a hot blast stove. The system at least comprises an air slope setter, an air flow signal selector, an air flow adjuster, a coal gas slope setter, a coal gas flow signal selector and a coal gas flow adjuster. According to the method, after a combustion signal is received, an air flow set value output to the air flow adjuster by the air slope setter is gradually increased, and a combustion-supporting air adjusting valve is controlled to gradually increase an air flow; the coal gas flow set value on an input port of the coal gas slope setter follows the air flow actual-measurement value to be gradually increased, and is output to the coal gas flow adjuster, and a coal gas adjuster is controlled to increase the coal gas amount, so that ignition is achieved; an ignition task is completed until the air flow actual-measurement value is equal to the set value of the air slope setter, and the coal gas flow actual-measurement value is equal to the set value of the coal gas slope setter; and finally, the normal stove burning process is executed through the air flow adjuster and the coal gas flow adjuster. According to the system and method, flow stable control can be effectively achieved, the coal gas flow follows the air flow actual-measurement value to achieve proportional control, and automatic and safe ignition is achieved.

The invention discloses an active flow field reconstruction air-cooling tower, comprising: a tower body; a radiator located at the bottom of the tower body; a flow guiding device arranged outside the radiator; The radial direction of the radiator extends outward from the radiator; the back plate has a concave portion, the opening of the concave portion faces the radiator, and the wind deflector is partially located in the concave portion; the cover plate is arranged above the wind deflector and the back plate, and the two ends of the cover plate are respectively It is connected with the top of the back plate and the tower body, and the wind deflector, the back plate and the cover plate form a guide channel; the back plate includes a first louver, and the blades of the first louver extend in the vertical direction; The opening degree of the first louver is controlled; the application of the above-mentioned active flow field reconstruction air cooling tower can improve the adaptability of the flow field reconstruction device to different wind directions.

The invention discloses an LED lead frame, and the lead frame is a plate type frame structure. The invention is characterized in that a plate type frame is formed by arranging convex plates which are extended towards the middle part and mutually spaced in a peripheral frame, the convex plates respectively form a chip holding part, an inner lead connecting part, an outer electrode part and a pipe body supporting part, the peripheral frame forms a connecting base plate, the inner lead connecting part and the chip holding part are positioned at the front end of the outer electrode part, and the chip holding part is provided with a reflecting cavity. Simultaneously, the invention discloses a method for manufacturing an LED by adopting the lead frame, a process that encapsulating colloid is injected and moulded is adopted to cause the LED chip to be capsulated, and after a pin and an electrode outside the LED is punched and bent, the LED is separated from the base plate of the lead frame into an independent device. The invention has the advantages that the structure is simple, the LED lead frame is easy to be installed, and the consistency of the product is good.