37results about How to "Fix flutter" patented technology

The invention relates to a ball screw grinding chatter stability limit graph determining method, comprising the steps: 1) establishing a dynamics model of a grinding process via an experimental method; 2) according to the stability criterion of cybernetics, determining a grinding chatter stability limit graph; and 3) according to the grinding chatter stability limit graph, determining the parameters of the grinding technique for ensuring the grinding stability. The invention mainly aims at solving the chatter inhibition problem of a numerical control thread grinder in the grinding process of a ball screw, adopts the experimental design method to accurately identify the parameters of the grinding dynamics model, determines the grinding chatter stability limit graph according to the parameters, and provides the parameters of the grinding technique to ensure the grinding stability, thereby effectively solving the chatter inhibition problem in grinding process. The curve can be used to determine the parameters of the grinding technique, namely the abrasion wheel main shaft speed n and the grinding depth h to avoid flutter, thus the invention can improve the grinding quality and efficiency of the ball screw.

A geophysical exploring device method for the transitional zone areas between bog and shallow beach sea belongs to the technical field of geophysical exploration. An air gun is arranged in a drill bit composed of two drill bit piece bodies, filling blocks are welded into the two drill bit piece bodies, a drill stem connecting flange is arranged at the bottom of a drill stem, the drill stem connecting flange is of an integrated structure, drill bit connecting flanges are arranged at the upper portions of the drill bit piece bodies, the drill bit connecting flanges are of two semi-annular structures, the drill stem connecting flange is sleeved by an anti-loosen screw to be connected with the drill bit connecting flanges, and accordingly the drill stem and the drill bit piece bodies are combined to form a main body structure of a detachable type air gun drill bit. Two symmetrical spiral pieces are welded to the bottoms of the drill bit piece bodies respectively to form a dual-spiral drill bit structure. The diameter of the drill bit composed of the two combined spiral piece is 500mm. The drill bit piece bodies are of hollow structures, composed of two semi-tubular structures respectively and sleeved by screws to be fixed. The air gun is arranged in the hollow structures. By means of the dual-spiral drill bit structure, stimulating operation of the air gun can be finished synchronously.

The invention discloses a numerical control card-less rotary cutter, which comprises a base, a front tool post, a rear tool post, a moving motor, compression rollers, a compression roller speed control system and a compression roller rotating motor, wherein two ends of the base are provided with upright brackets which are provided with round timber clamping mechanisms; the base is provided with a tool post slideway, and two ends of the front and the rear tool posts are arranged on the tool post slideway through slide blocks which are sleeved on a sliding leading screw; two compression rollers are arranged on the front tool post in parallel, one compression roller is arranged on the rear tool post, and the three compression rollers are arranged in a triangular shape; the base is provided with a rotary motor which is matched with the round timber clamping mechanisms through a triangular belt, a driven wheel and a big gear wheel, and the driven wheel is matched with a cutting feed speed reducer, a rear transmission gear box, a rear driving shaft and the sliding leading screw; the compression roller rotating motor is matched with the front tool post compression roller; and the motors are connected with a master control system of a computer control cabinet through conducting wires, and an integrated circuit chip is arranged in the computer control cabinet. The numerical control card-less rotary cutter solves the technical problems of rotary cutting bending and fluttering of thin round timbers and operation semi-automation in the prior art.

The invention discloses a method for optimizing static aeroelasticity and flutter of an all-moving horizontal tail. Firstly, a finite element model is established, then static aeroelasticity, flutterand balance weight are optimized one by one, the matching degree is high, the minimum-weight full-motion horizontal tail which meets the requirements for static aeroelasticity and flutter and does notaffect the appearance of the horizontal tail is obtained, constraint conditions are met, and the problems of static aeroelasticity and flutter of an airplane are effectively solved.

The invention discloses a novel dual-blade-groove cutting tool. The cutting tool comprises a tool bar and two profiling cutting blades; the two profiling cutting blades are installed on a same workingsurface of the end part of the tool bar; a main blade bit of a working end of one of the profiling cutting blades is skew to the left by an angle alpha, and a main blade bit of a working end of the other profiling cutting blade is skew to the right by an angle alpha; and the two profiling cutting blades are symmetrically distributed, and alpha is an acute angle. Compared with a standard groove cutting tool, the contacting area between the cutting tool and a cutting workpiece is reduced in the feeding process along the radial direction, so the radial cutting force is reduced; groove processingis conducted by back-and-forth and layer-by-layer feeding of the cutting tool along the axial direction, so the cutting force generated by processing is mainly axial and the radial cutting force is greatly reduced; and the problem of vibration in the process of processing is solved, the processing precision is improved, and processing efficiency is conveniently improved.

The invention relates to a novel marine self-floating type wind-wave power generating device. The novel marine self-floating type wind-wave power generating device is composed of four self-floating type multi-energy collecting wheels fixed by an anchored rectangular rod frame and used for driving power generators separately. The novel marine self-floating type wind-wave power generating device ischaracterized in that six arc-shaped blades are arranged on a hub of each self-floating type multi-energy collecting wheel, the above-water portions of the blades receive wind energy, and the underwater portions of the blades receive wave energy; and the hollow hubs are used for achieving self-floating, ratchets are arranged on the inner rings of the hollow hubs, ratchet wheels on speed-up machines force the wave energy and the wind energy to selectively rotate in the same direction to push the hollow hubs to rotate the ratchet wheels only in the same direction. The sector blades can be used for receiving the wind energy or the wave energy, the wind energy or the wave energy is absorbed by arc-shaped concave surfaces of the blades, the wind energy or the wind energy is converted into mechanical axial force to push the hollow hubs to rotate, the ratchets cooperating with the ratchet wheels are arranged on the inner rings of the hollow hubs, the ratchet wheels force the wave energy or the wind energy to selectively rotate in the same direction to push the hollow hubs to rotate only in the same direction, thus, the speed-up machines are driven to rotate, and the power generators coaxial with the speed-up machines rotate at a high speed to start to generate power.

The invention discloses a one-way valve, a rocket engine supercharging system and a rocket engine. The one-way valve comprises a guide cylinder, a valve body and a valve element. The guide cylinder is provided with an open end, a closed end and a first boss which transits from the closed end to the open end; the valve body is connected with the outer wall of the guide cylinder to form a main cavity, and is provided with an inlet channel and an outlet channel communicated with the main cavity; the axial cross section of the valve element is in a T shape, the small-diameter end of the valve element is a connecting end, the large-diameter end of the valve element is a force application end, the connecting end is movably arranged on a first boss in the guide cylinder through an elastic piece, and the force application end is used for sealing the inlet channel under the action of the elastic piece. A discharge cavity is formed between the closed end and the elastic piece, and a leakage opening is formed in the portion, forming the discharge cavity, of the guide cylinder and used for discharging media leaked from the main cavity to the discharge cavity. In the state that the force application end seals the inlet channel, the contact areas of the two surfaces in the thickness direction of the force application end and the main cavity are the same, so that the valve is prevented from being opened when the valve is reversely communicated with a high-pressure medium.

The invention discloses a semi-automatic five-shaft dividing and cutting machine which comprises a machine frame, a shaft supporting component, a rotating shaft component, a supporting wheel component, a cutting and moving platform, a control panel, an electrical box, a driving box, a displayer and a cutting component. Five cutting shafts are symmetrically installed on a shaft bottom plate and a shaft installation rear plate through radial bearings respectively, and two sets of shafts are installed on the shaft bottom plate. One set of shafts are used for cutting, the other set of shafts are used for feeding and discharging, can rotate around a T-shaped shaft and are interchanged in position, shaft supports are arranged during cutting of the cutting shafts, supporting wheels are arranged on one side of a workpiece and used for offsetting cutting radial force, five shafts carry out cutting at the same time, the production efficiency is nearly five times that of a single shaft, the overall machining time is shortened due to coincidence of feeding and discharging auxiliary time and cutting basic time, the production efficiency is improved, due to the application of the shaft supportsand the support wheels, the problems of flutter, cutter back-off and the like in the cutting process are effectively solved, the cutting quality is improved, and the defects are overcome.

The invention discloses a remote sensing satellite platform control and image correction method based on flutter information. The method comprises the steps of simulating satellite motion and constructing a flutter image data set, expanding data volume through data enhancement, preprocessing flutter image data, extracting image flutter information by using a ResNet algorithm, feeding back the flutter information to a satellite attitude control system for control, and guiding a Transformer model to perform image correction by using the flutter information. In order to solve the technical problem that space tasks such as high-resolution reconnaissance cannot be clearly imaged due to limitation of high-frequency low-amplitude micro-vibration of a spacecraft, satellite flutter information is solved by using a flutter image, and a satellite platform is controlled and image correction network learning is guided by using the flutter information. Therefore, a satellite flutter estimation, attitude control feedback and image correction closed-loop system is built. The invention provides a satellite flutter information estimation and attitude control information feedback based on a ResNet algorithm and a flutter image correction intelligent method based on a Transform model, and the spatial information intelligent processing capability of China is effectively improved.

The invention provides a pneumatic support device for steady operation of an overlong boring cutter bar. In the device, two support plates of a cylinder support (3) are fixed on a base plate, and thedistance between the two support plates meet the mounting requirements of a cylinder (7); a connecting line between cylinder mounting holes on the two support plates and the central line of the base plate form an included angle alpha; and the degree of the included angle alpha is consistent with the direction of resultant cutting force. Two ends of the cylinder (7) are fixed on the cylinder support (3); and the cylinder support is fixed on an end face of a boring cutter bar (1); the boring cutter bar (1) is provided with an air tube mounting groove, one end of an air tube (8) is communicated with the cylinder, and the other end thereof is communicated with a pressure regulating/stabilizing unit (4) and an air tube switch (5). A piston rod of the cylinder extends to prop on the inner wall of a bottom hole and support the boring cutter bar when compressed air enters the cylinder. The pneumatic support device solves the problems of cutter relieving and vibration due to insufficient cutterbar rigidity in precision boring of hole parts with large length-diameter ratio, is applicable to boring of holes with large length-diameter ratio, and has the advantageous of simple structure, convenient operation, reliable operation, low cost and no pollution.

The invention provides an arc-shaped guide rail cab sun-shading device which comprises a motor module, a roller shutter assembly, guide rails, flexible shafts and up-and-down limiting devices. Guide rails at different radians are adopted according to different vehicle body steel structures, the sun-shading device can well adapt to and increase space in a cab, power is transmitted through the high-performance flexible shafts, and synchronism and the same direction are guaranteed; the flexible shafts are made of compact fixed structure steel pipes, and the stability, coordination and balance of a sun-shading curtain overall system are guaranteed; the purpose that under limitation of the existing compact space and shape, the sun-shading device occupies small space in order to increase the space of the cab is achieved; high efficiency, stability and high strength are achieved, sun-shading requirements under various vehicle body shapes are met, loading is convenient, performance is reliable, and no jamming or twisting phenomenon exists.

Disclosed is a solid wood floor. The solid wood floor comprises a plurality of floor blocks and leveling devices arranged below the floor blocks, and is characterized in that each floor block comprises a plurality of single floors spliced with one another and keels arranged below the single floors and fixedly connected with the single floors; the keels extend to the edges of the floor blocks and are connected with the keels of the adjacent floor blocks in an adjacent mode; and the leveling devices are arranged below the adjacent keels. By means of the structure, the multiple single floors and the multiple single floors and the keels are stably connected in sequence, deformation of the solid wood floor can be effectively prevented, and therefore the problems of tile deformation, bulging, warping and the like are solved. In addition, through the arrangement of the leveling devices, the heights of the adjacent floor blocks can be adjusted in sequence very conveniently, the ground height difference is eliminated, and therefore the solid wood floor can adapt to complex sites.