2572 results about "Front edge" patented technology

The invention provides a turbine blade design method which comprises the following steps: S1, dividing a turbine blade profile into four sections at equal intervals along the radial direction according to the size of a turbine, and calculating section parameters of a middle-section turbine blade profile; s2, connecting the four sections by adopting a third-order Bezier curve, defining a blade front edge angle theta as an included angle between the Bezier curve and a blade front edge radial inlet angle alpha, and generating a three-dimensional blade model by changing the inclination angle theta of each section; s3, performing optimization to obtain an optimized theta parameter; and S4, according to the optimized theta parameter, fitting each section blade profile by using a third-order Bezier curve to generate a turbine stator and rotor three-dimensional model. According to the method, the machine learning method is applied to design of the turbine blade, the three-order Bezier curve, the CFD numerical simulation method and the particle swarm optimization are utilized, the blade parameters are given, the geometric parameters can be quickly and accurately predicted, the calculated amount is reduced, the cost is reduced, the design efficiency is improved, and the quality of the designed blade is guaranteed.

An absorbent article having a front edge intended to be positioned at a front side of a person and a rear edge intended to be positioned at a rear side of a person, said absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet, and an absorbent material between said topsheet and said backsheet, wherein at least a first spacer element is included between said topsheet and said backsheet, wherein the first spacer element has a top side facing the topsheet, a bottom side facing the backsheet, and a number of lateral sides between the top and the bottom side, and wherein the absorbent material extends along at least two opposite lateral sides of the first spacer element; said first spacer element being configured to guide liquid to the absorbent material upon wetting of the absorbent article.

A bipedal robot includes an upper region includes a head and neck assembly having a neck portion and a head portion coupled to the neck portion. Said head portion includes: a frontal shell having a rear edge, a rear shell having a frontal edge, and an illumination assembly. The illumination assembly is configured to illuminate a region that: (i) extends between a rear edge of the frontal shell and an extent of the frontal edge of the rear shell, (ii) is positioned adjacent to the extent of the rear edge of the frontal shell, and (iii) is positioned adjacent to the extent of the frontal edge of the rear shell.

A gutter cover system has a reverse-curve cover and clips, fastened to fascia, that secure the back edge of the cover. The front of the cover has an S shape with a convex upper part and a concave lower part. The lower part clips inside the upper front edge of the gutter. The cover is corrugated with fore-aft extending ridges and grooves. The corrugations create small triangular openings for water to enter the gutter while preventing small leaves and evergreen needles from entering the gutter.

The utility model relates to an air bag cushion and a mattress using the same. When an existing air bag cushion is assembled, the splicing precision of adjacent air bag strips is poor. The air bag cushion comprises a cushion body, the cushion body comprises air bag strips which are arranged side by side in the front-back direction of the cushion body, the front edges and the rear edges of the adjacent air bag strips are provided with front connecting pieces with front holes and rear connecting pieces with rear holes respectively, and when the front connecting pieces and the rear connecting pieces of the adjacent air bag strips are fixedly connected in an overlapped mode, the front connecting pieces and the rear connecting pieces of the adjacent air bag strips are connected in an overlapped mode. And the front holes are vertically aligned with the corresponding rear holes, so that the adjacent air bag strips are arranged in parallel at equal intervals. The front connecting piece and the rear connecting piece are provided with the front hole and the rear hole respectively, the front hole and the rear hole are vertically aligned, and it is ensured that the front connecting piece and the rear connecting piece are accurately stacked and fixedly connected, it is ensured that the adjacent air bag strips are parallel to each other, it is also ensured that the distance between the adjacent air bag strips meets the use requirement, and comfortable support is provided for a user; the use experience is improved.

An embodiment vehicle body structure includes a floor panel, a dash crossmember mounted at a front edge of the floor panel, and a dash panel connected to a top edge of the dash crossmember, wherein the dash crossmember includes a cross portion extending in a width direction of a vehicle and a front portion protruding from the cross portion toward a front of the vehicle, wherein the front portion includes a horizontal wall protruding horizontally from the cross portion toward the front of the vehicle, an upper flange extending vertically upward from the horizontal wall, and a lower flange extending vertically downward from the horizontal wall, and wherein the horizontal wall, the upper flange, and the lower flange each extend in the width direction of the vehicle.

The invention relates to the field of the centrifugal fan industry, in particular to an impeller with multi-element coupling bionic blades and a centrifugal fan, the impeller comprises a front disc and a rear disc, an exhaust inlet is formed in the middle of the front disc, a plurality of blades are arranged on the rear disc in a surrounding array mode, and the blades comprise long blades and short blades which are evenly distributed at intervals; the long blades and the short blades are all metal plate type single-arc multi-element coupling bionic blades. According to the impeller with the multi-element coupling bionic blades and the centrifugal fan, according to the principle of a bionic flow control technology, the front edge of the long blade adopts a streamline structure characteristic of simulating the outer side edge of a shark tail fin, and the tail edge of the blade adopts a typical arc tooth structure characteristic of simulating the feather front edge of a tenon wing; the common problems of small flow, low pressure, low efficiency and large noise of a centrifugal fan in the prior art are solved.

The invention discloses a low-water-head water turbine with a flow guide wing bionic blade, which is provided with a variable pitch system for adjusting an included angle between a runner blade and an incoming flow direction, and a deflection control system for adjusting an included angle between a guide vane arranged on a bulb body and the incoming flow direction, the water flow impact acting force on the blades can be changed through the water flow impact acting force, the water flow impact acting force on the blades can be changed through the water flow impact acting force, and the water flow impact acting force on the blades can be changed through the water flow impact acting force. In addition, the blade of the runner of the hydraulic turbine set is the blade with the wave-shaped front edge, and a section protruding outwards is arranged in a pipeline for containing the bulb body and the runner, so that the water energy utilization rate of the hydraulic turbine set is further increased. The blade adopts a sine curve-shaped waveform front edge, and the structure simulates a convex shape on a fin-shaped limb of an underwater organism, so that the resistance in water is reduced, and the water energy utilization rate of a water turbine set is increased.

A bipedal robot includes an upper region includes a head and neck assembly having a neck portion and a head portion coupled to the neck portion. Said head portion includes: a frontal shell having a rear edge, a rear shell having a frontal edge, and an illumination assembly. The illumination assembly is configured to illuminate a region that: (i) extends between a rear edge of the frontal shell and an extent of the frontal edge of the rear shell, (ii) is positioned adjacent to the extent of the rear edge of the frontal shell, and (iii) is positioned adjacent to the extent of the frontal edge of the rear shell.

The invention describes a testing apparatus (1) for use in a wind turbine rotor blade manufacturing facility, comprising a pulling means (10) adapted to pull an adherent strip (3T) from a surface of a rotor blade (2); a positioning arrangement (11) configured to maintain a predetermined pull angle (x) between the adherent strip (3T) and the surface of the rotor blade (2) during a test procedure; and a support frame (12) for holding the pulling means (10) and positioning arrangement (11), which support frame comprises a clamping arrangement (14) adapted to clamp about the leading edge (2LE) of the rotor blade (2). The invention further describes a method of performing a test procedure on a wind turbine rotor blade (2) using the inventive testing apparatus (1).

Various implementations include a low-drag smart tether system for measuring fluid speed and direction. The system includes a sleeve, a pressure sensor, and a tether. The sleeve has a longitudinal axis and an airfoil shaped cross-section as viewed in a plane perpendicular to the longitudinal axis. The sleeve has a leading edge. The sleeve defines a tether opening extending parallel to the longitudinal axis. The pressure sensor is disposed along a surface of the sleeve. The pressure sensor is configured to measure the pressure exerted on the pressure sensor by air moving over the surface of the sleeve. The tether extends through the tether opening defined by the sleeve. The tether has a tether longitudinal axis. The tether opening is positioned such that fluid flowing around the sleeve causes the sleeve to rotate about the tether longitudinal axis.

The invention relates to a cooperative control method for smooth pit-passing braking of a vehicle. The cooperative control method comprises the following steps that geometric data of a road surface pit and initial time data of predicted contact between a target wheel and the front edge of the pit are obtained through a preview sensing system; when the geometric data and the initial time data meet a preset triggering condition, triggering a suspension position control mode of the target wheel: acquiring target height data of a suspension, and generating a movement track of an active suspension of the target wheel from the current height data to the target height data; controlling an active suspension actuator to track the motion trail; and responding to the condition that the active suspension actuator reaches the preset supporting state. According to the method, traditional passive impact bearing is converted into active impact avoiding and buffering, so that collision energy between the wheels and the pothole edge is greatly absorbed, vertical bumping and pitching shaking of a vehicle body under the condition that a single wheel passes through a pit are effectively restrained, and unprecedented stable and comfortable braking experience is provided for passengers.

The invention discloses a fatigue life evaluation method for a single-crystal high-temperature alloy blade with a recrystallization defect, and relates to the technical field of blade life evaluation, and the method comprises the following steps: obtaining single-crystal high-temperature alloy data through a first experiment, and carrying out data analysis; a three-dimensional finite element model of the single-crystal high-temperature alloy blade is constructed, and first simulation of crack propagation is carried out; and constructing a recrystallization defect-fatigue life database. According to the fatigue life evaluation method for the single-crystal high-temperature alloy blade with the recrystallization defect, the fatigue life of the single-crystal high-temperature alloy blade with the recrystallization defect is predicted in a damage-free mode, the serviceable blade can continue to serve, and the economic loss of blade scrapping caused by dissection is reduced; the fatigue life of the blade is evaluated on the basis of crack parameters such as initial crack positions, initial crack front edge shapes and three-dimensional crack propagation tracks generated by recrystallization defects distributed at different parts of the blade, and the evaluation result is more accurate.

The air conditioner outdoor unit comprises an outer shell and a fan part, the fan part comprises a hub and a plurality of blades, a front edge, a rear edge, a blade top and a blade root are formed on each blade, and a plurality of characteristic faces are arranged from the blade root to the blade top; wherein the front edge distribution curve is formed by the projection of the front edge of the blade on the meridian plane, the rear edge distribution curve is formed by the projection of the rear edge of the blade on the meridian plane, and the points on the working angle distribution curve are composed of the working angles on the characteristic planes and the radiuses of the corresponding characteristic planes. At least one of the leading edge distribution curve, the trailing edge distribution curve and the working angle distribution curve is represented by a Bezier function. The front edges and / or the rear edges of the blades are adjusted through the front edge distribution curve, the rear edge distribution curve and the working angle distribution curve to optimize the flow field of the fan part, the smoothness degree of airflow passing through the blades is improved, the flow velocity distribution on the blades is controlled, the performance of the blades meets the design requirement, and then the static pressure coefficient and the working efficiency of the fan part are optimized.

Disclosed is a sanitary article comprising a topsheet and a backsheet, the sanitary article extending in a longitudinal direction and in a transverse direction, the sanitary article having a first and second longitudinal side edges, a front edge and a rear edge, the sanitary article having a first fastening wing extending from the first longitudinal side edge and a second fastening wing extending from the second longitudinal side edge, the first fastening wing including a first coated adhesive region, being constituted by the total adhesive area provided on a garment facing side thereof and the second fastening wing including a second coated adhesive region, being constituted by the total adhesive area provided on a garment facing side thereof.

A transfer device includes an extendable transfer platform. The transfer platform includes a fixed plate, a moveable plate, and at least one platform actuator configured to selectively move the moveable plate relative to the fixed plate between a retracted position and an extended position in which a leading edge of the moveable plate is located distally from a leading edge of the fixed plate. The transfer platform also includes a transfer belt having a first end secured to a first driven roller, and a second end secured to a second driven roller. The transfer device also includes a platform support structure secured to the transfer platform for supporting the transfer platform above a floor surface. The platform support structure includes at least one support actuator configured to selectively move the transfer platform relative to the floor surface between a lowered position and a raised position.

The invention discloses a fan blade detecting and deicing system and method. The fan blade detecting and deicing system comprises a detecting unit, a deicing unit and a control unit. The detection unit comprises an icing detection assembly, an icing thickness detector and a temperature sensor are arranged in the icing detection assembly, the icing thickness detector detects icing thickness data of the blade surface in real time, and the temperature sensor detects temperature data of the fan blade surface in real time; the deicing unit comprises an electric heating film which is at least laid on the front edge of the blade in the length direction of the blade. And the control unit comprehensively analyzes the icing thickness and temperature change condition corresponding to the whole blade according to the icing thickness data and temperature data of the blade surface, and independently triggers and controls the heating state of each blade deicing unit based on the comprehensive analysis result. According to the fan blade detecting and deicing system and method, the precise monitoring function, the intelligent deicing strategy and stable and safe operation are integrated, and the wide application and popularization value is achieved.

The utility model discloses a blade for wind power generation, and belongs to the technical field of wind power. The blade comprises a first blade section and a second blade section which are independent of each other, a first section is arranged at the tail end of the first blade section, a second section is arranged at the head end of the second blade section, and the first section and the second section are connected in an assembled mode through a mechanical connecting assembly and an inclined glue joint layer. The mechanical connecting assembly comprises a plurality of single connecting structures which are distributed on the upper side, the lower side and the front edge area of the blade section. An included angle of 30 degrees is formed between the fracture surface and the axis of the blade; the distance between the setting position of the section and the root of the blade is 30-35% of the length of the whole blade; local reinforcing skins are laid on the transition area of the blade root and the easily-damaged area at the position 1 / 3 away from the blade tip. According to the utility model, a mixed connection mode can be adopted, the advantages of the two connection modes can be integrated, and the connection strength is ensured while the weight of the segmented blades is reduced.

The invention discloses an axial flow fan and an air conditioner. The axial fan includes: a hub; the blades are connected to the periphery of the hub at intervals; in the blade profile section of the blade, the blade profile relative camber F / D is 30%-40%, and the maximum camber relative position E / D is 55%-65%; and in a shape graph of rotationally projecting the axial fan to the meridian plane, the line types of the front edge distribution curve and the rear edge distribution curve are flow direction types without sudden change. The air conditioner comprises the axial flow fan. The air conditioner has the advantages of being large in air volume and high in whole machine heat exchange capacity.

A fan has a rotating bulge defining a radially outermost point of the rotating cone relative to a rotational axis. The rotating bulge is defined by a radially outwardly extending forward portion leading to the radially outermost point on the bulge and then a radially inwardly extending portion aft of the radially outermost point of the bulge leading into the core engine path within the splitter housing. The core splitter housing has a leading edge, and the bulge radially outermost point being upstream of the leading edge of the splitter housing. The bulge radially outermost point is a first radial distance from a rotational axis, and the leading edge of the splitter housing being at a second radial distance of the rotational axis, and a ratio of the first radial distance to the second radial distance being at least 0.95.

The invention relates to the technical field of axial flow fans, in particular to an impeller with S-shaped blades and an axial flow fan applying the impeller. On the axial projection of the impeller, the peripheral contour of each blade is defined by a blade root edge, a blade front edge, a blade outer edge and a blade rear edge, and the blade root edge is connected with the hub; the blade front edge and the blade rear edge are both wavy curves, and the blade root edge and the blade outer edge are both arc-shaped lines with the axis O of the hub as the circle center. Each blade is provided with a pressure face and a suction face, the pressure faces and the suction faces are oppositely arranged, and on the radial projection of the impeller, the pressure faces are arranged in a wave shape in a protruding mode from one end of the blade root edge to one end of the blade rear edge towards the suction faces and then concavely arranged, so that the blades are of an S-shaped structure. The problem that a traditional blade structure cannot meet the use requirements of high efficiency and low noise can be solved.

The invention relates to an active optimization design method of an axial flow fan blade, which comprises the following steps of: defining a blade profile construction line by adopting seven parameters such as a leading edge radius, and parameterizing and representing two-dimensional blade profile geometric characteristics based on NURBS curve control points; a two-dimensional blade profile and three-dimensional fan coordinate system is constructed, and control point coordinate mapping is achieved through matrix transformation; the method comprises the following steps: acquiring an initial sample based on Latin hypercube sampling, and establishing a Gaussian process proxy model by combining two-dimensional CFD calculation data; a K-RVEA algorithm is applied, maximization of a worst attack angle lift-drag ratio and minimization of a resistance coefficient are taken as double targets, Pareto optimization is carried out in combination with geometry and performance constraints, and iteration is terminated through a hyper-volume convergence criterion; and the optimized two-dimensional blade profile parameters are converted into NURBS description, and stacking is carried out in the spanwise direction to generate a three-dimensional blade entity. The grid sensitive effect in three-dimensional optimization is overcome, the flow field analysis precision is improved, invalid calculation is reduced, the blade profile curvature continuity and the process feasibility are guaranteed, and the design period of the axial flow fan is shortened.

The present invention relates to the field of detection equipment technology, solving the technical problem in the prior art that sensors are still easily lost in severe icing conditions. In particular, it relates to an anti-icing sensor with a V-shaped concave-convex groove on the windward side. A temperature measuring end is provided on the side of the sensor housing away from the mounting seat. The temperature measuring end is provided with an anti-icing structure. The sensitive element is connected to the sensor housing and is located on the inner side or leeward side of the temperature measuring end. The cross-section of the windward end parallel to the airflow direction is an isosceles triangle. The first vertex of the isosceles triangle of the windward end faces the direction of the incoming flow. The groove at the front edge of the windward end has a V-shaped cross-section. As the flow direction extends, the groove width increases with a linear gradient and the groove depth decreases with a linear gradient, forming a continuous three-dimensional topological surface. The present invention uses the different affinity and repellency surface properties of the concave-convex steps to break up water droplets and even water films, accelerate the flow of water droplets in the groove, reduce the overall ice adhesion of the windward end surface by nearly half, and greatly reduce the damage of ice to downstream components.

An embodiment of a fishing fly box includes a generally rectangular open case defining an interior space for holding fishing flies including ferromagnetic hooks. The case is defined by a side wall structure extending from a base surface. A locking lid is configured for sliding movement along opposed top edges of the side wall structure, between an open position and a closed position in which the lid is slid forward with its leading edge abutting an edge of the case at the first side wall of the case. One or more magnets are positioned in the side wall structure or base surface. A blade edge is attached to the case in the interior space and exposed at a notch formed in the side wall structure, and is covered by the lid with the lid in the closed position.

The invention provides an AI-based engine blade defect identification and detection method and system, and the method comprises the steps: S1, scanning an engine blade through an eddy current detection probe according to the sequence of the front edge, the blade body, the rear edge and the root of the engine blade, obtaining an eddy current response signal, and transmitting the eddy current response signal to a signal processing system; s2, extracting defect features from the defect eddy current signal of the defective engine blade; extracting a defect-free feature from the defect-free eddy current signal of the defect-free engine blade; s3, establishing and training an engine blade detection model through the extracted defect features and defect-free features; and S4, whether the engine blade to be detected has defects or not is detected through the engine blade model. According to the invention, based on artificial intelligence eddy current detection, the accuracy and efficiency of detection are improved, the probability of missing detection and false detection is reduced, and the technical problem of missing detection or false detection caused by low detection efficiency in the prior art is solved.

The invention relates to the technical field of optics, in particular to blade front and tail edge polishing and correcting equipment which comprises a clamp for loading a to-be-detected guide vane, a polishing system is arranged beside the clamp, and the to-be-detected guide vane is vertically placed on the clamp; the system also comprises a laser interferometer system. The laser interferometer system comprises a laser and a beam splitter, and the beam splitter splits a measuring light beam and a reference light beam; linear collimating lenses are respectively arranged on light paths of the measuring light beam and the reference light beam, and the measuring light beam and the reference light beam respectively penetrate through the collimating lenses to form horizontal linear light beams. On-line real-time detection is achieved through the laser interferometer system, the defect portions of the front edge and the tail edge of the guide vane are accurately positioned, the polishing head can conveniently move to the defect portions to conduct fine polishing, the production period is shortened, and the production cost is reduced.

The invention belongs to the technical field of uncertainty probability characterization analysis, and discloses a thermoplastic composite material leading edge structure design allowable value probability characterization method and system under a small sample condition, and the method comprises the steps: defining a plurality of candidate probability distribution models; fitting each model based on the original sample data and calculating an AIC value and a BIC value; a dynamic weight factor alpha is calculated according to the sample size n, and then a hybrid information criterion HIC value is calculated; generating a plurality of sample sets through Bootstrap self-service sampling, recalculating the HIC value on each sample set, and counting the selected optimal frequency of each model; and determining an optimal probability distribution model according to the frequency, wherein the optimal probability distribution model is used for representing a design allowable value. According to the method, the dynamic weight factor alpha is introduced, AIC and BIC criteria are effectively unified, optimal balance between prediction precision and model complexity is achieved under the condition of small samples, and engineering practicability and robustness are remarkably improved.

The invention relates to a steering engine and piezoelectric patch hybrid driven variable camber wing, belongs to the technical field of aerospace, and solves the problems of poor wing surface deformation continuity and poor transmission effect in the prior art. The plurality of flexible trailing edge deflection modules are arranged in the straight wing main body; the skin structure is arranged on the outer surfaces of the straight wing main body and the flexible trailing edge deflection module; the module connecting structure is connected with the plurality of flexible trailing edge deflection modules; wherein the straight wing main body comprises a front edge D-shaped structure wing box, a plurality of wing ribs arranged on the rear side of the front edge D-shaped structure wing box, and a bearing rear wall arranged on the rear sides of the wing ribs; each flexible trailing edge deflection module comprises a driving rib assembly fixed to the bearing rear wall, driven rib assemblies arranged on the two sides of the driving rib assembly, carbon rods sequentially connected with the driving rib assembly and the driven rib assemblies, an inhaul cable driving mechanism and a piezoelectric driving mechanism, and the driving rib assembly and the driven rib assemblies are sequentially arranged in the longitudinal direction of the variable-camber wing.

A recreational vehicle comprising a generally horizontal floor, a plurality of generally upstanding walls defining a living space in conjunction with the floor, and a seating element in contact with the floor and comprising a plurality of tubular supports and a plurality of generally planar side panels, and wherein: upper edges of the plurality of side panels comprise a first ledge adjacent a front edge and a second ledge proximal a rear edge, the ledges being closer to a lower edge than a remainder of the upper edge is to the lower edge, each of tubular supports extends from a ledge of one side panel to a corresponding ledge of another side panel, and an upper surface of the tubular supports positioned in the ledges is coplanar with the remainder of the upper edge.

The invention relates to the crossing field of mechanical engineering and intelligent manufacturing, and discloses a real-time monitoring, regulating and controlling method for the manufacturing process of an automobile lightweight component. According to the method, a distributed fiber bragg grating sensing array is embedded in a mold, and a three-dimensional strain field at the flowing front edge of resin is obtained in real time; a multi-scale pore generation kinetic model is combined to perform online inversion on an unwetted area and pore distribution; and the pressure gradient and the mold temperature field of the hot press are adaptively regulated and controlled, and the flow path is dynamically corrected. The system comprises a sensing embedding module, a strain demodulation module, a pore inversion module, a regulation and control instruction generation module and a multi-zone execution module. According to the method, closed-loop precise control over the porosity being lower than 0.5% is achieved, and the consistency and reliability of the mechanical property of the component are remarkably improved.