69results about How to "Effective speed control" patented technology

The present invention discloses an electric vehicle asynchronous motor fuzzy adaptive dynamic surface control method with the consideration of an iron loss. According to the control method, by using the nonlinear function in a fuzzy logic system approximation system, an adaptive backstepping method is used to design a controller, and the dynamic surface control technology and a fuzzy adaptive method are combined. Through introducing a first-order low-pass filter, a 'computing explosion' problem caused by continuous derivation in traditional backstepping control is successfully overcome. In addition, control signals uqs and uds only exist in an adaptive parameter Theta<^>, and the amount of computation is reduced. Through fuzzy adaptive dynamic surface control method adjustment, motor operation can rapidly reaches a stable state and is more suitable for a control object with the need of rapid dynamic response like an electric vehicle driving system, a simulation result shows that the influence of parameter uncertainty is overcome and an ideal control effect is ensured according to the control method, and the rapid and stable response of rotation speed is realized.

The invention discloses a high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and a method for preparing the same, and belongs to the technical field of metal-basecomposite materials. The method includes compressing superfine aluminum powder until the porosity of the superfine aluminum powder is appropriate, loading the superfine aluminum powder in jackets, sealing the jackets and drilling the peripheries of the jackets to allow an appropriate quantity air to flow into the jackets; placing the jackets in air furnaces, heating the jackets at the low temperatures and thickening oxidation films; increasing the temperatures until the temperatures reach the high temperatures, generating AlN and Al2O3 from nitrogen and oxygen in the air, sintering powder treated at the high temperatures, and carrying out heat processing on the powder to obtain the high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material which is an (AlN+Al2O3)/Al composite material with excellent high-temperature strength and heat resistance. The high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and the method have the advantages that the air is used as oxygen and nitrogen sources, and complicated equipment can be omitted; risks such as aluminum powder combustion can be prevented, the quantities of oxide and nitride can be easily regulated and controlled, and the high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and the method are short in period, low in cost, easy to control and suitable for large-scale industrial preparation.

The invention provides a GIS (Geographic Information System)-based operational control method and system for a pipeline cleaner or a detector. The operational control method comprises the following steps: acquiring a circuit graph layer of a natural gas pipeline by using a GIS; acquiring natural gas flow data in real time by establishing a pipeline model and using an SCADA (Supervisory Control and Data Acquisition) system; calculating a theoretic flow value of natural gas in the natural gas pipeline; controlling and adjusting the actual control flow value to be equal to the calculated theoretic value according to the actual natural gas flow data value acquired in real time; further controlling the operational speed of the pipeline cleaner or detector. The method and the system realize real-time control of natural gas flow of each trace point gate station of the natural gas pipeline, ensure that the flow data can be reasonably scheduled by detection personnel and further effectively control the operational speed of the pipeline cleaner or detector.

The invention belongs to the technical field of aluminum alloy inspection, and in particular, discloses a 4G base station aluminum alloy radiator profile extrusion mold. The extrusion mold comprises an upper mold part and a lower mold part (3); and the upper mold part and the lower mold part (3) are superposed to form the extrusion mold. The extrusion mold is characterized in that a feed port is formed in the end surface of the upper mold part; the feed port is provided with division holes (2) and guide holes (5); the division holes (2) and the guide holes (5) are arranged side by side in parallel; a mold hole is formed in an extrusion mold cavity of the lower mold part (3), and comprises a tooth piece part (4) and a baseplate part (8) communicating with each other; the tooth piece part (4) is corresponding to one guide hole (5) in the upper mold part; and the baseplate part (8) is vertically corresponding to the multiple division holes (2) in the upper mold part. The extrusion mold extrudes a radiator profile through a complete extrusion method to finally improve the heat dissipating performance of a radiator and to satisfy the 4G base station development demands so as to solve the problem of weak performances in a traditional inserted piece type radiator.

The invention discloses an extreme learning machine based control method for an asynchronous motor drive system of an electric automobile. According to the invention, aiming at a problem of nonlinear and iron loss problem of a prior electric automobile motor drive system, a command filtering technology is introduced into a traditional backstepping design method. Through the introduction of a compensation mechanism, errors caused by filtering waves are reduced and a problem of calculation explosion caused by continuous derivation in traditional backstepping control is solved successfully. According to the invention, by utilizing the extreme learning machine algorithm for approximating a nonlinear function in the motor drive system, the method provided by the invention is combined with the command filtering technology and a self-adaptive backstepping method. Through regulation by utilizing the method provided by the invention, operation of the motor can reach a stable state quickly. The method is suitable for control subjects requiring quick dynamic response such as the electric automobile drive system. A simulation result shows that the control method provided by the invention can eliminate influence due to parameter uncertainty and is beneficial to ideal control effect, so that quick and stable response to rotation speed is realized.

The invention discloses a stepped transmission with mechanical uninterrupted power. The stepped transmission comprises a frictionless transmission speed regulator, a first shaft, a second shaft, intermediate shafts, odd-numbered-gear driving gears, odd-numbered-gear driven gears, even-numbered-gear driving gears, even-numbered-gear driven gears, odd-numbered-gear combining sleeves and even-numbered-gear combining gears, wherein the frictionless transmission speed regulator comprises a speed regulating motor or a hydraulic motor, a speed regulator input gear and a speed regulator output gear; the speed regulator input gear is meshed with a driving gear of the first shaft; the speed regulator output gear is connected with the even-numbered-gear driving gears or the even-numbered-gear drivinggears through the intermediate shafts; and through the frictionless transmission speed regulator, the rotating speed of the speed regulating motor or the hydraulic motor is changed, the rotating speed of the speed regulator output gear is regulated, and the shifting between odd-numbered gears and even-numbered gears is completed. The stepped transmission with mechanical uninterrupted power has the beneficial effects that no any friction parts are adopted during the gear shifting process and the stepped transmission with the uninterrupted power is achieved; furthermore, the gear shifting process is completed through gear transmission and switchover; and the impact force during the gear shifting process is eliminated.

The invention discloses a command filtering control method of an extreme learning machine of a permanent-magnet synchronous motor for an electric vehicle. According to the control method, aiming at the problems of iron loss and non-linearity existing in an electric vehicle motor driving system, a command filtering technology is introduced to a traditional back-stepping design method, an error generated by filtering is reduced by introducing a compensation mechanism, and the problem of computation explosion caused by continuous derivation during the controller design process by the traditional back-stepping design method is successfully solved. An extreme learning machine algorithm approaches to a non-linearity function in the system, and the command filtering technology and a self-adaptive back-stepping method are combined; after adjustment by the control method, the operation of a motor can rapidly reach a stable state, and the control method is more suitable for a control object, such as a driving system for the electric vehicle, requiring rapid dynamic response; and a simulation result shows that the influence of parameter uncertainty can be solved with the adoption of the control method, an ideal control effect is favorably ensured, and rapid and stable response to a rotational speed is achieved.

The invention discloses an online regulating system of an optical fiber drawing chuck. The online regulating system comprises the chuck, a drawing furnace and a coating die which are sequentially arranged from top to bottom and is characterized in that the top of a prefabricated rod is suspended on the chuck, the body of the prefabricated rod is placed in the drawing furnace, subjected to high-temperature melting and drawn into an optical fiber, the optical fiber penetrates the coating die for coating, the transverse positions of the chuck are regulated through a first linear drive mechanism and a second linear drive mechanism which are located on a transverse direction and are perpendicular to each other, and a concentricity detecting device is arranged between the drawing furnace and the coating die. The online regulating system is simple in structure, high in applicability, capable of conveniently and flexibly regulating optical fiber positions online to allow the optical fiber to be concentric with the central position of the coating die, capable of increasing coating evenness and consistence, capable of guaranteeing coating quality, capable of avoiding defective conditions such as fiber breaking, capable of greatly increasing production yield, capable of guaranteeing production quality, capable of lowering production loss and capable of increasing production economic benefits.

The invention provides a rising swing blade type vertical-shaft wind generating set, wherein a hinged seat is arranged at one ends of support rods; the hinged seat is hinged to a rotating support through a first pin shaft and the axial direction of the first pin shaft is perpendicular to the length direction of the support rods; fan blades are hinged to the other ends of the support rods through a hinged mechanism; a buffer cushion is arranged between the rotating support and the support rods. Compared with the prior art, the support rods are hinged to the rotating support through the hinged seat and the first pin shaft, the stability of the vertical-shaft wind generating set is improved by virtue of the gyroscopic effect, and in the meantime, the buffer cushion made of an elastic material is arranged between the rotating support and the support rods of the rising swing blade type vertical-shaft wind generating set; the buffer cushion causes all the support rods to be located within the same horizontal plane, and as a result, the stability of the whole set is effectively guaranteed and the output power of the generator is kept stable. In addition, as the fan blades are hinged to the support rods through the hinged mechanism, the windward area of a wind wheel can be adjusted according to the wind power; the rising swing blade type vertical-shaft wind generating set is capable of generating power normally even at strong wind; the rising swing blade type vertical-shaft wind generating set is good in strong wind resistance, simple in structure without tail vane, material-saving and low in composite cost.

The invention belongs to the technical field of fuel supply for internal combustion engines, and in particular, relates to a novel structure low-temperature pump. The novel structure low-temperature pump comprises a cold end area, an air-state cooling area and a hot end area; the air-state cooling area is arranged between the cold end area and the hot end area; the cold end area comprises a cold end pump body and a vacuum insulation cover; a cold end piston is arranged in the cold end pump body; the end part of the cold end piston is designed in a ring groove opening form; the head part of a cold end connecting rod is mounted in a piston opening ring groove; the hot end area comprises a hot end piston; the hot end piston is mounted in a hot end pump body; a pressure relief device is arranged on the hot end piston; a displacement sensor is arranged on the hot end pump body; and a high-pressure air pipe is arranged in the air-state cooling area. The novel structure low-temperature pump has the following beneficial effects: liquefied natural gas in a low-temperature tank can be totally pumped out to improve the vehicle endurance; the structure is simple and effective; the reliabilityis improved; the machining manufacturability is excellent; and the batch production is convenient.

The invention discloses a fan temperature sensing and speed regulating method. The method comprises the following steps that 1, a fan is powered on to start, and a fan system enters an intelligent control mode; 2, a temperature sensor senses the external environment temperature, and the external environment temperature is fed back to a controller in time; 3, the controller compares the external environment temperature with the temperature data pre-loaded in a database so as to extract the data of temperature which is the same as or close to the external environment temperature, the corresponding rotating speed of the temperature data is taken as a control instruction, the control instruction is sent to a driving board, and the driving board controls a fan motor to work; and 4, the temperature sensor continuously senses the external environment temperature and circularly executes the step 2 and the step 3. According to the fan temperature sensing and speed regulating method, the rotating speed can be correspondingly adjusted according to the temperature change of the external environment.

The invention discloses a method for preparing needle-like yttrium oxide. The method comprises the following steps: first reacting yttrium nitrate or yttrium chloride which serves as an yttrium sourcewith a complexing agent ethylene diamine tetraacetic acid in a water bath to obtain a sol-shaped first intermediate product; then reacting the first intermediate product with an alkali solution undera hydrothermal condition to obtain a second intermediate product yttrium carbonate; and calcining to obtain monodispersed yttrium oxide particles having micron-grade sizes and are of a needle shape with two tip ends under an electron microscope. The needle-like yttrium oxide prepared by the method has unique appearance, good dispersibility, uniform size and excellent optical performance; and thepreparation method is simple, is easy to operate, and is low in cost and wide in application prospect.

A vehicle may include a dual clutch transmission that adjusts a travel speed of the vehicle based on clutch torque, a brake that makes the vehicle slow down to reduce the travel speed of the vehicle, and a controller that sets a target speed of the vehicle and controls the dual clutch transmission and the brake to allow the travel speed of the vehicle to follow the set target speed.

The invention discloses a concrete distributing machine for a bridge floor. The concrete distributing machine consists of three parts, i.e. a traveling part (1), a hopper part (2) and an electric appliance remote control part (3), wherein the traveling part (1) comprises two light steel rails (1-1) paved along the bridge direction; two electric end beams (1-2) are arranged on the light steel rails (1-1); the hopper part (2) comprises a hopper box (2-1) and a hopper frame (2-2); the hopper box (2-1) is arranged in the hopper frame (2-2) which is connected with a box type traveling wheel (2-3) with a motor; the electric appliance remote control part (3) comprises a complete machine braking motor (3-1) and hopper braking motors (3-2); the same sides of the two electric end beams (1-2) are respectively provided with a traction wire guiding rope bracket (3-3) and a fixed electric box (3-4) by bolts. The concrete distributing machine disclosed by the invention has the advantages that the operation is convenient, the construction cost is effectively reduced, the labor intensity of workers is greatly reduced and the working efficiency is improved.

The invention discloses a feeding machine with weighing systems and a leaked feed receiving device. The feeding machine comprises a frame, a feed bin, feed hoppers, feed spraying pipes, electromagnetic valves, a vibrator, the leaked feed receiving device and the weighing systems, wherein the upper part of the frame is connected with the feed bin; one or more feed hoppers are connected with and arranged below the feed bin in a vertical direction; one or more feed spraying pipes are connected with and arranged on each feed hopper; a plurality of the feed spraying pipes are in connected arrangement from bottom to top along the vertical direction of the feed hoppers; the plurality of the feed spraying pipes are arranged into one or more rows; the outlet direction of the plurality of the feed spraying pipes is horizontally and slightly inclined downward; the vibrator is connected with and arranged on the outer wall of a feed hopper, or connected with and arranged on a connecting body of theplurality of the feed hoppers, or connected with and arranged on the outer wall of the feed bin; each feed spraying pipe is provided with an air blowing pipe; each air blowing pipe is connected withan electromagnetic valve; the leaked feed receiving device is connected with and arranged below the frame, can collect a feed scattered in the process of feeding and can automatically scrape a scattered feed into a collection box; and the weighing systems can weigh and measure a feed sprayed from the feed spraying pipes.

The invention relates to a mechanical stirring type co-coagulation flotation coupled two-layer horizontal sedimentation tank water purifying system and a method thereof. Dissolved air flotation is organically combined with a two-layer horizontal sedimentation tank to form a novel floatation and sedimentation tank. Mechanical flocculation and the dissolved air floatation are organically combined through a co-coagulation flotation technology to form co-coagulation dissolved air floatation in order to enhance the stability of a bubble floc. The air floatation are organically combined with ozone oxidation to realize full contact with polluting substances in water in order to greatly enhance the ozone oxidation effect. Mechanical flocculation, co-coagulation flotation and two-layer horizontal sedimentation are organically combined, so the operation is convenient, and the stable bubble floc is formed while effectively controlling the rotating speed and reducing the water conservancy loss. The method has the advantages of flexible running manner, effective reduction of the running cost, high water quality change adaptability, simple structure, high efficiency, convenience in running, and wide application prospect.

The invention discloses a straw pulverizer, including a pulverizing chamber, a rolling shaft, a transmission gearbox, and a motor. The pulverizing chamber is arranged on a rack, and the left side of a pulverizing chamber housing is provided with a feeding inlet. The inner wall of the pulverizing chamber is provided with a fixed cutter. The pulverizing chamber is internally provided with the rolling shaft. The rolling shaft is provided with a moving cutter. The rolling shaft and the transmission gearbox are connected. The transmission gearbox is connected with the motor through a V tape. The motor is arranged on a motor base. The motor base is arranged on the rack. The motor is on the right end of the pulverizing chamber. The straw pulverizer effectively improves automation degree of the pulverizer. Through cooperation of the fixed cutter and the moving cutter, straws are pulverized more thoroughly. Through cooperation of the motor and the transmission gearbox, rotating speed of the moving cutter can be effectively controlled. The straw pulverizer is simple in structure, reasonable in design, low in energy consumption, and easy in popularization and application.

The invention relates to the technical field of non-motor vehicle speed limiting mechanisms, and discloses a speed limiting wheel disc mechanism based on a disc brake, the speed limiting wheel disc mechanism comprises a first brake disc, a second brake disc and a connecting mechanism, the first brake disc and the connecting mechanism are fixedly connected through the connecting mechanism, one side of the first brake disc is provided with an arc-shaped groove I, and the other side of the first brake disc is provided with an arc-shaped groove II; a limiting supporting column is fixedly installed in the middle of one side of the first brake disc, and an arc-shaped groove II is formed in the side, corresponding to the arc-shaped groove I in the first brake disc, of the second brake disc. According to the speed limiting wheel disc mechanism based on the disc brake, the maximum compression displacement of a single set of reset springs is set, so that it is ensured that centrifugal force borne by a transmission pressing block after a non-motor vehicle reaches the set speed can effectively overcome the elastic force influence of the reset springs; and the displacement amount for extruding the first brake disc and the second brake disc to move towards the two sides can be in contact with calipers on the disc brake, and the braking effect is achieved.