2120 results about "Windage" patented technology

The invention relates to a water-drop-shaped captive balloon high-altitude wind power generation system. The water-drop-shaped captive balloon and kite cloth carried by the water-drop-shaped captive balloon are used for generating lift force to drive a ground power generator to generate power. The lift force generation mechanism is that the windward side and the wind resistance are increased by adjusting the pitch angles of the aerostat and the bearing kite cloth, and the wind resistance is converted into cable tension to drive power generation. A V-shaped pulley expansion mode is adopted to uniformly distribute tension of main and auxiliary cables, so that bag damage caused by non-uniform stress in a posture adjusting process is avoided; the captive balloon is provided with an attitude controller, communicates with a ground control system through wireless data transmission, adjusts the take-up and pay-off speed of a main cable and an auxiliary cable to control the pitching angle to achieve lift force control, and greatly improves the power generation efficiency. The main cable power output winch drives a generator to generate electricity through a one-way bearing, and the input end is connected with a motor through a clutch to achieve cable recovery. The backpack kite cloth can be controlled to open and close through a small winch to increase and decrease wind resistance; lift force and wind resistance control is optimized, the power generation efficiency is improved, safety is enhanced, operation is simplified, and maintenance is convenient.

The invention relates to the technical field of automobile design, and particularly discloses an automobile wind resistance optimization design method based on a machine learning model, and the method comprises the steps: collecting data of different automobile types, and carrying out the cleaning and standardization processing; constructing a wind resistance prediction model, training the model by using the preprocessed data, and minimizing a prediction error by adjusting model parameters; key design variables are selected, the variation range of the key design variables is determined, and a parameterized model is constructed; selecting sample points in a design variable space, generating a corresponding geometric model, calculating a wind resistance coefficient and establishing a sample point database; dividing sample point data into a training set and a test set, optimizing a machine learning model, searching an optimal solution in combination with an optimization algorithm, and iteratively updating the model by increasing sample points until the precision requirement is met; an optimal design variable combination is determined, an optimized automobile geometric model is generated, CFD simulation verification is carried out, and a design scheme containing detailed parameters and optimization results is output.

This application provides a wind-resistant, stable power generation agricultural-solar hybrid system, including pillars, beams, photovoltaic supports, and photovoltaic panels erected in farmland. The photovoltaic panels are equipped with a buffer mechanism and an overload release device. The buffer mechanism effectively absorbs kinetic energy and reduces the swaying amplitude and speed of the photovoltaic panels through its elasticity, and automatically resets the photovoltaic panels after strong winds. The overload release device protects the photovoltaic panels from damage caused by strong winds. This application overcomes the technical defects of existing static wind-resistant systems, reduces system wind resistance, can withstand super typhoons, provide stable power generation and irrigation, and promote agricultural production.

The invention provides a control method, device and equipment for a mine ventilation system and a storage medium, and the method comprises the steps: determining a first target branch based on a complete incidence matrix corresponding to a mine ventilation network diagram and the branch weight of each branch in the mine ventilation network diagram; acquiring target air volume data of the first target branch, and acquiring branch air volume data of each branch based on the target air volume data; obtaining a second target branch corresponding to an independent path in the mine ventilation network diagram based on the complete incidence matrix; obtaining target resistance data of the second target branch, and obtaining branch resistance data of each branch based on the target resistance data; based on the branch air volume data and the branch resistance data, wind resistance adjustment data and wind resistance data are obtained; obtaining actual wind resistance data based on the wind resistance data and the wind resistance adjustment data; and dynamically controlling the mine ventilation system based on the branch resistance, the air volume monitoring data and the actual air resistance data. And the ventilation system can be adjusted as required.

The cab comprises a driving compartment and a steering mechanism, the driving compartment is provided with a driving cabin and comprises a front portion and side portions located on the two sides of the front portion, wheel openings are formed in the side portions and used for being matched with front wheels, the wheel openings and the front wheels are concentrically arranged, and the steering mechanism comprises a steering wheel arranged in the driving cabin. In the X direction, the value range of the maximum size L4 of the driving compartment is larger than or equal to 1550 mm and smaller than or equal to 1950 mm, the distance between the center point of the steering wheel and the center point of the wheel opening is L11, and the value range of L11 is larger than or equal to-65 mm and smaller than or equal to 335 mm. Wherein L11 is a negative value when the center point of the steering wheel is located on the side, close to the front portion, of the center point of the wheel opening, and L11 is a positive value when the center point of the steering wheel is located on the side, away from the front portion, of the center point of the wheel opening. According to the cab in the embodiment of the invention, the layout of the cab can be reconstructed, a design space is reserved for forming a streamline structure at the front part of the cab in a limited space, and the design of the low-wind-resistance cab is conveniently realized.

The invention discloses a data processing method and device for a whole vehicle wind resistance coefficient, terminal equipment and a storage medium. The method comprises the steps of obtaining a plurality of shape parameter design variable samples of a vehicle; designing a variable sample based on each shape parameter, and training to obtain a wind resistance coefficient prediction model; carrying out global optimization on the wind resistance coefficient prediction model by taking a prediction result of the wind resistance coefficient prediction model as a fitness function value based on a particle swarm algorithm to obtain an optimal appearance parameter design variable; and obtaining an optimal shape design scheme of the vehicle based on the optimal shape parameter design variables. According to the method, the wind resistance coefficient is predicted through the prediction model and the particle algorithm, automatic calculation of the vehicle wind resistance coefficient is achieved, the accuracy problem caused by artificial subjective analysis is avoided, and the analysis accuracy of the whole vehicle wind resistance coefficient is greatly improved.

The invention discloses a cab. The cab comprises a driving compartment. The driving compartment body comprises a front portion and side portions located on the two sides of the front portion. The maximum size of the driving compartment in the X direction is L4, and the value range of the L4 meets the condition that the L4 is larger than or equal to 1550 mm and smaller than or equal to 1950 mm. The front part comprises a windshield part, the windshield part is obliquely arranged relative to the vertical plane, the inclination angle is alpha 1, and the value range of alpha 1 meets the condition that alpha 1 is larger than or equal to 15 degrees and smaller than or equal to 25 degrees. The front portion further comprises a first area portion and a second area portion which are located below the windshield portion in the Z direction, and the second area portion is located between the first area portion and the windshield portion and connected with the windshield portion. And in the Z direction, the second area part is obliquely arranged relative to the vertical plane, the inclination angle is alpha 2, and the difference value between the inclination angle alpha 1 of the windshield part relative to the vertical plane and the inclination angle alpha 2 of the second area part relative to the vertical plane meets the condition that alpha 1-alpha 2 is larger than or equal to 0 degree and smaller than or equal to 5 degrees. According to the cab in the embodiment of the invention, the front part of the cab can form a streamline cab structure with low wind resistance in a limited space, and the design of the cab with low wind resistance is realized.

The invention provides a joint prediction method and system for a wind resistance coefficient and a surface pressure field of an automobile, and relates to the technical field of automobile aerodynamics. According to the joint prediction method, the pressure field and the wind resistance coefficient are predicted in the same network in parallel, and the wind resistance coefficient obtained by pressure field integration and derived from the pressure field and the wind resistance coefficient obtained by network direct regression are calibrated by physical consistency constraint. The model has physical confidence and interpretability while ensuring numerical precision, so that a key stress area can be positioned and serves an automobile modeling iteration process.

The invention discloses an intelligent clean air conditioner automatic control system and an integrated control method, and belongs to the technical field of clean environment control. In order to solve the problems of dispersed control, high energy consumption and insufficient dynamic response of an existing clean air conditioning system, an intelligent control algorithm and hardware facilities are integrated, a multi-parameter collaborative optimization model is constructed, and the temperature, humidity, airflow velocity and pressure of a clean workshop are accurately regulated and controlled in real time. The system comprises a central controller, a sensor network, an actuator and a control software module, an air valve and variable air volume equipment are dynamically adjusted through data fusion and a machine learning algorithm, wind resistance and turbulence are reduced, and airflow organization efficiency is optimized. Meanwhile, the system supports remote monitoring, fault self-diagnosis and self-adaptive energy-saving modes, and the operation stability and the energy efficiency ratio are remarkably improved. According to the integrated control method, the problems that a traditional system is insufficient in intelligence and high in maintenance cost are solved, and remarkable energy-saving benefits and environmental adaptability are achieved.

The cab comprises a driving compartment body and a vehicle door, the driving compartment body comprises a front portion and side portions located on the two sides of the front portion, wheel openings are formed in the side portions and used for being matched with front wheels, the wheel openings and the front wheels are concentrically arranged, the vehicle door is connected to the side portions and can be opened relative to the side portions, and the vehicle door comprises a front edge and a rear edge which are arranged in the X direction; in the X direction, the front edge and the rear edge of the vehicle door are located on the two sides of the center point of the wheel opening respectively, in the X direction, the distance between the rear edge and the center point of the wheel opening is L1, the distance between the front edge and the rear edge is L2, and the ratio a of L1 to L2 is larger than or equal to 0.65 and smaller than or equal to 0.95. According to the cab, the man-machine design of the cab can be optimized, the driving comfort and getting-on and getting-off convenience of a driver are improved, furthermore, the driving length requirement and / or the cab wind resistance design requirement can be considered while the man-machine design of the cab is optimized, and the streamline cab with low wind resistance is formed.

A dynamic wind-resistant flexible photovoltaic power generation mount system, in which multiple photovoltaic panels are mounted astride a same load-bearing cable and connected in series to form a flat-plate-type photovoltaic power generation suspension cable. Each photovoltaic panel can sway with the wind around the load-bearing cable. The present application overcomes the defects of existing static wind-resistant technologies, pioneers a new dynamic wind-resistant approach, reduces wind resistance, and achieves an exceptionally strong wind-resistant effect. The present application allows for an increased span, reduces the number of pile foundations, and minimally interferes with large-scale agricultural machinery operation. The movement speed of shadows is rapid, so that crop photosynthesis is not affected, and instead, crop growth is stimulated and agricultural yield and income are increased.

The utility model relates to an air duct structure and a cabinet machine in the technical field of air conditioners, the air duct structure comprises a main air duct, a fan, an air outlet frame and a grating, the grating is installed between the air outlet end of the main air duct and the air outlet frame, airflow in the main air duct contacts with the grating in the flowing process, the grating scatters eddy current, and the air outlet end of the main air duct is connected with the air outlet frame. Air flow blown out of the main air duct passes through the grille and then is blown to the air outlet frame, the pressure difference between the air flow and the air outlet frame is reduced, air outlet is smoother, and therefore abnormal sound is effectively eliminated. The installation position of the grille can effectively scatter the vortex area, meanwhile, installation operation of the grille is more convenient, the installation position is easy to operate, additional positioning pieces do not need to be added in the air duct to fix the grille, the grille only needs to be directly connected to the lower side of the air outlet frame or the upper side of the air outlet end, and the installation operation is convenient. The additional positioning piece is omitted, so that the smoothness of the air cavity of the main air duct is further improved, and the air resistance of the air cavity is reduced.

The invention provides a climbing robot. The climbing robot comprises a fixing frame, a box body arranged on the fixing frame, an obstacle crossing mechanism arranged on the box body and a climbing mechanism arranged on the obstacle crossing mechanism. A movable block is installed on the rotating shaft through a first spring, threaded rods are movably installed at the two ends of the movable block, bearing seats are installed on the threaded rods on the periphery of the first bevel gear, a fixed block is installed between the two bearing seats, and a rotating block is arranged in the fixed block and fixedly connected with the second bevel gear. Clamping blocks are installed at the lower ends of the rotating shafts and matched with movable grooves in the rotating blocks. And through the obstacle crossing mechanism, a large space is formed between the device and the climbing object for obstacle crossing, after obstacle crossing is completed, the device is attached to the climbing object again, wind resistance is reduced, and the climbing stability is improved. The climbing mechanism comprises moving arms on the two sides, shells are fixedly connected to the lower ends of the moving arms, driving rollers are fixed to the shell on the driving side, auxiliary rollers are fixed to the shell on the driven side, and the climbing efficiency can be effectively improved.

The invention discloses a tower crane cluster cooperative control method and system for an intelligent construction site and a medium, belongs to the technical field of tower crane control, and aims to solve the problems that existing cluster control among multiple tower cranes mainly depends on manual control, large potential safety hazards are easily generated in complex tower crane operation, and the working efficiency is high. And intelligent cooperative control of work among a plurality of tower cranes is difficult to realize. The method comprises the steps that track error prediction of a tower crane rope is conducted on current dynamic environment characteristics in a current construction area, and wind resistance-swing angle coupling error data are obtained; track intersection and coincidence judgment is conducted on the tower crane rope moving tracks of the tower crane tasks to be executed in the multiple tower cranes in the future time period, and an abnormal tower crane moving track diagram is predicted and determined; performing optimal path generation processing on the abnormal tower crane moving trajectory diagram under a federated learning framework to obtain an optimized tower crane moving trajectory diagram; and track avoidance execution processing is conducted on the risk tower crane with the track crossing risk, and a tower crane avoidance strategy of the risk tower crane is obtained.

The utility model belongs to the technical field of air conditioners, and discloses an air outlet mesh enclosure and an outdoor unit panel, main ribs are additionally arranged, and the minimum width of the main ribs in the radial direction of a center plate is limited to be larger than the width of radiation ribs in the radial direction of the center plate, so that the structural strength of the air outlet mesh enclosure is enhanced; therefore, when the air outlet mesh enclosure is designed, the number of the annular ribs can be reduced, so that the density of grids of the grating is reduced, the air outlet resistance of the air outlet mesh enclosure is reduced, and the noise of the air outlet mesh enclosure is reduced. Meanwhile, the minimum width of the main ribs in the radial direction of the center plate is limited to be larger than the width of the radial ribs in the radial direction of the center plate, the structural strength of the whole air outlet mesh enclosure can be improved, and the identification degree of the air outlet mesh enclosure is improved. In addition, the radiation ribs and the main ribs extend in the radial direction of the center plate in an arc mode, so that the radiation ribs and the main ribs are matched with the arc in the blade rotating direction of the wind wheel, the wind resistance of the air outlet mesh enclosure is smaller, and the air outlet noise is lower.

According to the deformable multi-rotor airship, an air bag filled with light gas is mounted in a rack, and the air bag can be inflated and deflated with the light gas from a gas tank at any time through an airborne gas pump. The multi-rotor aircraft is high in maneuverability and stable in attitude control, and the air bag can provide extra buoyancy, so that loads of the rotors are reduced, the overall flight efficiency is improved, and the endurance time is prolonged. Air in the air bag can be compressed into the air tank through the air pump, and the size of the air bag is reduced to reduce wind resistance and enhance control capacity. Firstly, additional lift force is provided by adding the air bag, the power consumption of the aircraft is greatly reduced, and the aircraft is suitable for long-time hovering and low-speed cruising. And secondly, the design reserves the flexibility and controllability of the multi-rotor unmanned aerial vehicle, more complex and efficient control can be carried out, and the dynamic response speed of the aircraft is effectively improved. And finally, the air bag capable of inflating and deflating air in real time greatly enhances the environmental adaptability of the aircraft, and can effectively cope with various complex environments in low-altitude scenes.

The invention relates to the field of fan operation monitoring, in particular to a dishwasher fan operation state real-time monitoring method and system.The method comprises the steps that a current stabilization sequence and a stabilization starting point moment of a fan are obtained, and a stable current mean value and a stable current standard deviation are calculated; calculating a load intensity index of the fan; fitting according to a least square method to obtain an adjustment index, and calculating an equivalent wind resistance coefficient based on the load intensity index and the adjustment index; acquiring a center line, an upper limit and a lower limit of the control chart, and calculating a current correction value at a target moment by using EWMA; generating and sending an alarm signal in response to that the current correction value is less than the lower limit or greater than the upper limit; and in response to that the current correction value is not greater than the upper limit and not less than the lower limit, calculating the fault probability of the fan to complete monitoring. According to the technical scheme, the precision of the fan monitoring result can be improved.

The invention relates to the technical field of household appliances, and discloses a refrigeration range hood which comprises an air conditioner assembly, a refrigeration assembly and a control assembly. The range hood assembly is arranged below the air conditioner assembly and comprises an air cabinet and a range hood fan, a condensation air opening is formed in the air cabinet, and the condensation fan is connected with the condensation air opening; the range hood fan is arranged in the air cabinet; the flow guide partition plate is arranged in the air cabinet, the flow guide partition plate is matched with the inner wall of the air cabinet to form a flow guide cavity, the air inlet end of the flow guide cavity is communicated with the condensate air opening, the air outlet end of the flow guide cavity is communicated with an air inlet of the range hood fan, and the flow guide partition plate comprises an extension section and an air guide section which are sequentially arranged from top to bottom; the air guide section extends to the side wall of the air cabinet from the bottom edge of the extension section. According to the refrigeration range hood, wind resistance can be reduced, the air volume can be increased, and noise reduction is facilitated.

The utility model provides a wind resistance balancing wing plate, which belongs to the technical field of balancing wing plates, and comprises a wing plate main body, the wing plate main body is divided into a front edge, a wing-shaped middle part and a rear edge along the spanwise direction, the wing plate main body is provided with a sawtooth structure, the sawtooth structure is continuously arranged triangular sawteeth, and the triangular sawteeth are arranged in the wing plate main body. The sawtooth structures are integrated on the edge of the wing plate body to form an integrated structure, the vertex of each sawtooth is located on the edge line of the wing plate body, gears of the sawtooth structures are arranged in a staggered mode, and the sawtooth structures are continuously distributed along at least one side edge of the wing plate body. The sawtooth structures are continuously distributed along the edge of at least one side of the wing plate body, preferably distributed on the edges of the two sides, so that the airflow optimization effect is maximized, turbulent flow of a traditional wind resistance balance wing plate is reduced, the smoothness of airflow is improved, and therefore wind resistance is reduced, and stability and efficiency are enhanced.

The invention provides a lifting luggage rack and a vehicle with the same, and relates to the technical field of automobiles. The lifting luggage rack comprises a support assembly and a lifting assembly, wherein the support assembly has a first state and a second state; the support assembly comprises a support body capable of moving up and down, a filling block and an end support capable of swinging, and the end support and the filling block are arranged at the two ends of the support body. When the end bracket, the filling block and the bracket main body are connected in sequence, the bracket assembly is in a first state; when the filling block moves downwards to enable the end bracket to be connected with the bracket main body, the bracket assembly is in a second state; the driving part comprises a first driving assembly and a second driving assembly, the first driving assembly is connected with the support body and the filling block, and the first driving assembly is used for driving the support body and the filling block to move up and down; the second driving assembly is connected with the end support and used for driving the end support to swing. The problems that in the prior art, a luggage rack generates large wind resistance, and oil consumption and power consumption are improved are solved.

The invention belongs to the field of photovoltaic supports, and provides a desert photovoltaic support foundation stabilizing device, which comprises a fixed pile; the supporting assembly is installed at the top end of the fixing pile, and a folding assembly is installed at the supporting assembly; the top frame is fixedly installed on the top face of the supporting assembly, connecting frames are fixedly installed on the two side walls of the top frame, top plates are rotationally installed at the connecting frames, and photovoltaic panels are laid on the surfaces of the top plates; the folding assembly comprises a mounting frame, a hydraulic push rod, a connecting rod, a sliding plate and a hinge rod; by arranging the fixing piles, the supporting assemblies, the top frame and the folding assemblies, wind resistance is greatly reduced, impact force borne by the top plate is reduced, the situation that the support is loosened, inclined and even collapsed due to strong wind impact is effectively avoided, the stability of the whole photovoltaic support under the severe wind power condition is ensured, and the service life of the photovoltaic support is prolonged. And the normal operation and the service life of the photovoltaic power station are ensured.

The cab comprises a driving compartment and a brake pedal, the driving compartment is provided with a driving cabin and comprises a front portion and side portions located on the two sides of the front portion, wheel openings are formed in the side portions and used for being matched with front wheels, the wheel openings and the front wheels are concentrically arranged, and the brake pedal is arranged in the driving cabin and connected to the front portion. Wherein in the X direction, the value range of the maximum size L4 of the driving compartment meets the condition that L4 is larger than or equal to 1550 mm and smaller than or equal to 1950 mm, when the brake pedal is in the non-braking state, the center point of the brake pedal is located on the side, facing the front portion, of the center point of the wheel opening, the distance between the center point of the brake pedal and the center point of the wheel opening is L9, and the value range of L9 meets the condition that L9 is larger than or equal to 10 mm and smaller than or equal to 410 mm. According to the cab in the embodiment of the invention, the layout of the cab can be reconstructed, a design space is reserved for forming a streamline structure at the front part of the cab in a limited space, and the design of the low-wind-resistance cab is conveniently realized.

The invention discloses an intelligent photovoltaic parking shed, and relates to the technical field of photovoltaic parking sheets.The intelligent photovoltaic parking shed comprises a shed framework, a photovoltaic module is installed at the top of the shed framework, a control module is installed below the photovoltaic module, a wind power regulation and control mechanism is arranged above the shed framework, and the wind power regulation and control mechanism is used for guaranteeing the overall use stability of the shed framework; a stable bin with a continuous curvature arc-shaped outline is adopted to guide lateral flow air to form a wall attachment effect and reduce differential pressure resistance caused by airflow separation, and the isosceles triangle splitter plates with the tip ends facing outwards and ventilation holes between the splitter plates are matched, so that strong air flow can be effectively guided to be dispersed to the two sides, and the heat dissipation effect of the control module is improved. According to the principle of aerodynamics, the wind resistance coefficient is greatly reduced, then the characteristics of airflow around the car shed framework are improved, airflow separation and generation of vortexes are effectively restrained, and airflow can bypass the car shed framework more smoothly.

The invention relates to the technical field of vehicle-mounted antennas, in particular to a combined ultra-short-wave high-power center-fed vehicle-mounted antenna which comprises an antenna base, an antenna whip rod, a row of curved section units, a long metal curved sheet, a whip head spring assembly and a whip root plate, the antenna base comprises an integrated shell fixedly connected with the whip root plate, and a wind box device installed in the integrated shell; when a vehicle runs normally, a row of curved section units form a hard straight frame, the curved section units bind the antenna whip rod, the antenna whip rod cannot be bent and swung, vibration impact on the vehicle has small influence on the hard antenna, the hard antenna can stably receive signals, and when the vehicle runs at a high speed, the antenna whip rod cannot be damaged. When the vehicle runs at a high speed, the hard straight frame formed by the row of curved section units is disassembled, the antenna pole loses constraint, airflow blows the antenna pole, and the antenna pole bends following the wind, so that the soft antenna can reduce the wind resistance of the vehicle in the high-speed running process.

The cab comprises a driving compartment body, the driving compartment body comprises a front portion and side portions located on the two sides of the front portion, wheel openings are formed in the side portions, and the wheel openings are used for being matched with front wheels and are concentric with the front wheels. In the X direction, the ratio of the length size L8 of the front overhang to the maximum size L4 of the driving compartment meets the condition that L8 / L4 is larger than or equal to 0.38 and smaller than or equal to 0.48; wherein the length dimension of the front overhang is the distance from the foremost end of the front part to the central point of the wheel opening in the X direction. According to the cab in the embodiment of the invention, the layout of the cab can be reconstructed, and in a limited space, a design space is reserved for forming a streamline structure at the front part of the cab while the driving comfort and the getting-on and getting-off convenience are met, so that the design of the low-wind-resistance cab is conveniently realized.

The invention relates to a bending moment-torque composite loading device for testing the load capacity of a steering engine, and belongs to the technical field of ammunition weapon system testing. In the device, the pressure head, the pressurizing rod and the composite loading slip ring synchronously rotate along with the rotation of the rudder wing, so that the applied pressure can be ensured to be always perpendicular to the rudder surface and is closer to the real wind resistance working condition during flight. The bending moment output device and the torque output device are coupled together through the composite loading slip ring, so that the bending moment and the torque can be loaded at the same time and are closer to the actual flight condition.

The invention belongs to the technical field of vehicle fairing control, and particularly discloses a vehicle fairing control method and system fusing oil consumption and wind resistance, a terminal and a medium. Comprising the steps that the speed, fuel consumption parameters and wind pressure parameters of a vehicle in the running process are obtained, and fuel consumption change parameters and wind pressure distribution characteristic parameters are extracted; a multivariable optimization model with the minimum comprehensive energy consumption as the target is constructed; based on the model, a model prediction control algorithm is adopted to solve the optimal control quantity of the attitude of the fairing in a prediction time domain, and control instructions of the angle and the deflection direction are generated; when environmental disturbance or attitude response deviation is detected, dynamically adjusting a target function weighting coefficient or an input penalty factor to correct control output; and adjusting the posture of the fairing in real time according to the corrected control instruction. Through fusion modeling of fuel consumption parameters and wind pressure characteristic information, predictive control and self-adaptive adjustment of the attitude of the vehicle fairing are realized, and fuel economy and aerodynamic performance can be considered under multiple working conditions.

The utility model discloses a mechanical control active air inlet grille and an automobile, the air inlet grille comprises a frame which is provided with a driving wheel and an air inlet, fan blades which are rotatably connected in the frame, an elastic component which is used for providing force for opening the fan blades, and an actuating mechanism which is arranged in the frame, according to the mechanical control active air inlet grille, the fan blades are kept in the open air inlet state through the elastic assemblies, the mechanical control active air inlet grille is suitable for low-speed heat dissipation, the air speed is high and the wind power is large at the high speed, air is sucked through the air inlet to serve as power, the action mechanism is pneumatically driven to close the fan blades, and then air resistance is reduced. When the vehicle speed is reduced, the elastic mechanism opens the fan blades to dissipate heat, the structure is simple and durable, the cost is reduced by replacing an original motor with a mechanical structure, and then the competitiveness of the whole vehicle is improved.

The disclosed technology includes a support system for an optical sighting device of a bow. The support system includes a support structure configured to attach to a bow and an elevation assembly configured to move along an elevation direction relative to the support structure. The support structure can include an elevation actuator configured to cause the elevation assembly to move along the elevation direction when the elevation actuator is actuated and a windage assembly configured to move along a windage direction relative to the support structure. The windage direction can be approximately perpendicular to the elevation direction. The support structure can further include a windage actuator configured to cause the windage assembly to move along the windage direction when the windage actuator is actuated. The windage actuator can be disposed at least partially in the elevation actuator.

The utility model provides a portable four-rotor unmanned aerial vehicle which comprises a vehicle body, four vehicle arms and four rotor assemblies, and one end of each vehicle arm is provided with one rotor assembly; a containing space is formed in the fuselage body, a first resistance reduction structure is formed at the front end of the fuselage body, and second resistance reduction structures are formed on the two sides of the fuselage body; a supporting structure is arranged at the bottom of the vehicle body, and the other end of each vehicle arm is connected with the supporting structure in a locking mode through a first locking piece. The four-rotor unmanned aerial vehicle has the advantages that wind resistance in the flying process can be effectively reduced, and therefore the flying speed of the four-rotor unmanned aerial vehicle can be increased; according to the four-rotor unmanned aerial vehicle, all the vehicle arms can be folded by simply disassembling the first locking pieces, and therefore the four-rotor unmanned aerial vehicle can be conveniently stored and transported.