45 results about "Parabolic trajectory" patented technology

A bicycle frame with a counter-rotating four bar linkage system includes a front frame section, a rear frame section, and a shock absorber. The front frame section includes a top tube, a head tube, a seat tube, a bottom bracket, a down tube and a pivoting base formed on the down tube near the bottom bracket. The rear frame section is connected pivotally to the front frame section and has two seat stays, two chain stays, two dropouts, a connecting member, an upper linkage member, a lower linkage member and a parabolic virtual pivot (PVP). The PVP moves in a forwardly and upwardly parabolic trajectory and the dropouts of the rear frame section move in a nearly vertical trajectory when the rear frame section is pivoting.

A method, device, and computer program for determining range to a target is disclosed. Specifically, the invention provides a method, device and computer program for determining a second range to a target based on a first range to the target and an angle to the target such that the parabolic trajectory of a projectile is accounted for in determining the second range. The device generally includes a range sensor for determining a first range to a target, a tilt sensor for determining an angle to the target, and a computing element for determining a second range to the target based on the first range and the determined angle.

A method for calibrating camera parameters is disclosed, which is carried out on the basis of a moving calibration object subject to the influence of gravity. The method is carried out by causing the calibration object to move along a parabolic trajectory under the influence of gravity, taking pictures of the calibration object that moves along the trajectory with a camera at a preset shutter speed to obtain a plurality of calibration image with the calibration object at different positions and times, and based on the coordinates of the calibration images and the picturing times, estimating homography between an image plane and a trajectory plane, and then using the constraints provided by the homography to obtain intrinsic and extrinsic parameters of the camera.

A reconnaissance system that comprises a projectile (10) that has an opening (17) through which images of a target area can be acquired. The projectile (10) is launched from a portable launcher (30) towards the target area, and comprises image acquiring means (13, 14) for acquiring images of the target area through the opening (17) and for transmitting the images to a remote station (70); means for stabilizing the projectile (10) and/or the image acquiring means (13, 14) while flying in a nearly-parabolic trajectory above the target area; and a remote station (70), for receiving and displaying the transmitted images that comprises a monitor (71) for displaying the transmitted images.

A real-time sun avoidance method of a camera with a cylindrical hood for a geostationary orbit satellite includes a first step of calculating, according to the orbital information, an included angle [beta] between the direction of the sun and the Z axis of an orbital coordinate system, and a sun avoidance offset angle [phi]sunavoid before optimization; a second step of determining the trajectory of a parabola A: for dA>0, then A=ax2+bx, otherwise, A remains unchanged, where the parabola independent variable x=[alpha]+[delta]-[beta], [delta] denotes a selected avoidance margin angle and a and bdenote parabolic coefficients respectively; a third step of calculating a camera safety angle [tau] after optimization; and a fourth step of calculating a sun avoidance offset angle [phi]<[tau]>sunavoid after optimization according to the calculated camera safety angle [tau] after optimization in the third step. The method in the invention ensures that the included angle between the direction ofthe sun and the optical axis of the camera transitions smoothly at the sun avoidance starting point and ending point in accordance with the pre-designed parabolic trajectory, thereby eliminating the risk of jet unloading due to the sun avoidance and improving the service life of the camera.

The invention discloses a parabolic trajectory directional tangent constant speed welding robot device, and belongs to the technical field of welding robots. The device comprises a mechanical arm consisting of an X-axis translation component and Y-axis translation component, a Z-axis turntable, a controller, a welding power supply, a welding gun and the like. A workpiece with a parabolic trajectory welding seam rotates along with a workpiece mounting table under control, and the welding gun moves along with the X-axis and Y-axis translation components under control. An independently moving three-degree-of-freedom mechanism is used for realizing a high-quality welding function for the parabolic trajectory welding seam of the workpiece. During welding, the welding gun is always on a normal on a parabolic trajectory welding seam weld point, a welding direction is the tangential direction of a parabolic trajectory, a tangent always faces a certain preset fixed direction, welding speed is kept constant, welding quality and efficiency are high, and manufacture, maintenance and using cost are low. The relative position and posture of the welding gun and the welding seam weld point on the workpiece are always kept at each point during the welding, so that an optimal welding effect can be achieved.

The invention belongs to the technical field of confrontation shooting simulation and in particular relates to one set of an algorithm for judging a simulated shooting effect by a flight track kineticenergy projectile, minimum structures and functions of a device and an information platform which are matched with the algorithm, and a principle for recognizing a target and identifying diversifieddamage effects. The algorithm provided by the invention takes a digital imaging technology as the foundation, and a shooter opinion is deduced through resolving an optical imaging relation and quantifying a digital image; a position relation between a target and the projectile is judged by combining actual determination and a projectile calculation technology; and simulated shooting can be carriedout on any physical object. The algorithm provided by the invention is better that a light direction collimation technology which cannot represent a trajectory, is optimized and innovated in the aspect of damage recognition, can more vividly represent the shooting and can obtain more valuable battlefield data; and the algorithm is especially applicable to the shooting simulation of a sniper riflesystem, is also applicable to other firearms or point mass destruction weapons with a parabolic trajectory and also can be used for civilian shooting sports or entertainment.

An automatic player piano is a combination between an acoustic piano and an electronic system serving as a recorder and an automatic player; while a user is fingering a piece of music on the acoustic piano, the player strongly depresses some keys and softly depresses other keys so as to give artistic expression to the tones, and the depressed keys give rise to hammer motion at different values of hammer velocity; since the hammer velocity is proportional to the loudness of tones, the controller is expected exactly to determine the hammer velocity; the hammers travel on linear trajectories and parabolic trajectories depending upon the hammer velocity so that the controller estimates the hammer velocity by using different methods, whereby the controller can produce music data codes exactly expressing the tones to be produced.

The invention discloses a high-altitude parabolic detection method and device and a storage medium. The high-altitude parabolic detection method comprises the steps that images are continuously acquired, an image sequence is formed, and the image sequence comprises continuous multiple frames of images; detecting the image sequence to obtain a high-altitude parabolic trajectory; detecting the imagesequence to obtain a human body target; judging whether the high-altitude parabolic trajectory is associated with the human body target or not; and if not, shielding the human body target in the image sequence. And collecting a high-altitude parabolic trajectory by detecting the image sequence, and collecting a human body target by detecting the image sequence. And judging whether the high-altitude parabolic trajectory is associated with the human body target or not, and shielding the non-associated human body target in the image sequence to protect the personal privacy of the human body target. According to the method, personal privacy of irrelevant personnel can be protected while the high-altitude parabolic dangerous event is detected, and the method has popularization value in actualuse.

In a self-propelled construction machine, in particular cold milling machine, recycler or surface miner, for working ground surfaces, comprising a milling drum supported at a machine frame and a conveying device arranged at the machine frame which accepts the milled-off material from the milling drum during the working operation and, on a continuously revolving first transport belt, unloads it, in conveying direction, onto a point of discharge at a discharge end along a parabolic trajectory, it is provided for the following features to be achieved: as a minimum, the last section of the conveying device as seen in conveying direction comprises no less than one continuously revolving cover belt arranged above the transport belt, said cover belt extending essentially parallel to the transport belt and resting against the milled-off material on the transport belt at least in a partial section of the length of the transport belt.

The invention discloses a high-altitude parabolic monitoring and early warning system, which comprises a radar detection module, an intelligent analysis module and an early warning module, can monitorhigh-altitude parabolic in real time, has no time delay and quick response, and can quickly calculate the throwing position and the landing position of the parabolic according to the parabolic trajectory. And then pedestrians near the landing position are warned and prompted in time, evidence obtaining is conducted on the area near the throwing-out position so that responsibility can be quickly and accurately determined afterwards, the structure is simple, use is stable and reliable, and market competitiveness is high.

The invention discloses a method and system for preparing a direction-controllable bent optical bottle, and the method comprises the steps: simulating the interference between a plane wave and a circular Pearl vortex beam after the phase modulation of a parabolic trajectory through a computer, loading the amplitude and phase information of the beam to interference fringes, and acquiring a phase hologram and transmitting the phase hologram to a spatial light modulator; starting a helium-neon laser to emit a Gaussian beam which passes through a beam expander and a non-polarization beam splitting cubic mirror; after light is irradiated to the spatial light modulator, propagating the light through a 4f system to obtain a circular Pearl vortex beam after parabolic trajectory phase modulation; and transmitting the circular Pearl vortex beam under the parabolic trajectory phase effect in undisturbed air, so that the circular Pearl vortex beam can be transmitted along the preset parabolic trajectory, and a three-dimensional bent light bottle is spontaneously formed in the transmission process. The direction of the bent light bottle can be controlled, and the higher freedom degree is achieved in the aspect of capturing and controlling particles.

The invention belongs to the technical field of teaching equipment and provides a parabolic demonstration teaching aid for colledge mathematics teaching which comprises a fixed plate, a connecting plate, a rotary table, a launching barrel, a controller and a computer. The bottom end of the fixed plate is vertically provided with a groove, the groove is arranged inside the fixed plate, a through hole is uniformly arranged on the front end surface of the fixed plate, and a magnetic switch and an LED lamp are arranged in the through hole. The rotary table is rotatably mounted on the connecting plate through a first rotating shaft, and the rotary table can rotate in the vertical plane of the connecting plate; The launching barrel is rotatably mounted on the rotary table through the second rotating shaft, the launching barrel is used for ejecting the steel ball, a launching unit is arranged in the launching barrel, the launching unit is used for ejecting the steel ball in the launching barrel, and the steel ball moves in a parabolic trajectory in the groove of the fixing plate; the second rotating shaft is fixed on the upper end of the firing barrel, and the axis of the rotating shaft2 is located in the horizontal plane where the end face of the opening of the firing barrel is located. The invention ensures the precise adjustment, realizes the control of a single variable, and improves the scientificity of analysis and research.

The invention discloses a parabola gauge. The parabola gauge mainly consists of a coordinate frame 1, an abscissa wheel 2, an ordinate wheel 3, a V-shaped frame 4, a telescopic line 5, a coil spring 6, a sliding rod 11, a sliding block 12, a pen cap 13, line nozzles 21, an abscissa wheel fixing knob 22, a rotating wheel 41 and a connecting line 51. Due to the resetting tension of the coil spring, both the telescopic line and the connecting line are in a tensioned state. Firstly a midpoint of the telescopic line between the two line nozzles is fixed on the pen cap, then the abscissa wheel is fixed at a corresponding position on the coordinate frame by using the abscissa wheel fixing knob according to parameters of a parabola and a drawing pen is inserted into the pen cap, the sliding rod is moved upwards, the whole telescopic line is always maintained to be in the tensioned state in the moving process, and then a track of the drawing pen is the parabolic trajectory.

The invention discloses an improved solving method for a Lambert orbital transfer problem based on a Newton iteration thought. The method comprises the steps of 1, calculating a transfer angle theta,an auxiliary variable c and an auxiliary variable s; 2, determining the shape of the track according to the transfer angle and the auxiliary variable in the step 1; 3, when delta t is larger than delta tp, determining that the transfer orbit is an elliptical orbit, and carrying out solving; 4, when delta t is smaller than delta tp, determining that the transfer orbit is a hyperbolic orbit, and carrying out solving; 5, when delta t is equal to delta tp, determining that the transfer orbit is a parabola orbit, and carrying out solving; 6, expressing the Lambert orbital transfer problem analytical equation in the steps 3-5 as a function of a conic curve semi-major axis, and calculating a conic curve semi-drift diameter; 7, calculating orbital transfer point speed and intersection speed; and 8, proving the high efficiency and accuracy of the improved solving method for the Lambert orbital transfer problem based on the Newton iteration thought. The invention aims to improve the solving speed of the Lambert orbital transfer problem in spacecraft rendezvous.

The invention belongs to the technical field of slime water processing, in particular relates to a slime water classification pool based on the parabolic classification theory. The invention conducts the classification principles based on the differences in the parabolic trajectories of the coal slime particles with different shapes, weights, and sizes in the liquid medium; the pool at least comprises a pool body, an adjustable vibration board device, and a drainage mud sluggish board structure; the adjustable vibration board device comprises a vibration board, a hinge chain, flexible shock vibration pieces and an ultrasonic regulation device, and is arranged in the middle of each grading room, and the effect of speeding up the grading of coal mud particles and settlement can be achieved; the drainage mud sluggish board structure comprises an oblique board, a bracket, an axle, a bearing, and a manual rotating valve, the pool body is divided into five grading rooms and is connected with the pool bodies at the same time, the angle of the oblique board can be adjusted 360 degrees to achieve the full guidance of the coal mud particle classifications. The invention has the characteristics of being simple in structure, low in construction cost, small in maintenance workload and obvious in effect, and the like.

The present invention provides an interactive display device, wherein the interactive display device includes: a booth; two parabolic baffles with different shapes arranged on the booth; a disc that moves at any position on the booth; Between the two parabolic baffles of different shapes. The technical solution provided by the invention breaks through the traditional way of viewing and displaying, adopts two parabolic baffles with different shapes, allows the participants to manually eject the disc, and displays the optical properties of the parabola through its trajectory, realizing inquiry learning and improving the Participants are interactive and interesting.

The invention discloses a road dust removing device for urban environmental protection, which includes a base, a rectangular groove is reserved in the middle of the lower surface of the base, and a C-shaped steel slide rail is welded at the bottom of the rectangular groove near the four corners, and the sliding groove of the C-shaped steel slide rail is slidably connected with a bearing seat, thesame transmission roller is rotatably connected between two C-shaped steel slide rails with opposite openings, and the upper surface of the chassis is respectively fixed with a water storage tank anda water pump through bolts, and the water pumping end of the water pump is connected with the cavity of the water storage tank through a connecting conduit, and the upper surface of the chassis is close to the tail end through bolts to fix the inclined sliding groove. The water pumping end of the water storage tank is connected with the cavity of the water storage tank through a connecting conduit. The invention can sweep the dust in the middle of the road to the edge of the road under the action of a transmission belt, and the dust moves from the middle of the road to the side of the road ina translational manner so as to avoid the dust flying into the air in a parabolic trajectory caused by the traditional sweeping.

The invention discloses a high-altitude parabolic object detection and discrimination method based on millimeter wave radar data fitting. According to the method, a suspicious parabolic area of a high-rise building is monitored in real time through a millimeter-wave radar system, a distance-Doppler detection track of a moving target is obtained, and a distance-Doppler characteristic curve of the moving target in radar detection is used for discriminating a high-altitude parabolic behavior. And performing fitting processing on the distance-Doppler trajectory of the moving target after clutter suppression and a simulation characteristic result of classical mechanical parabolic motion, and judging whether a high-altitude parabolic behavior occurs or not. The invention effectively provides the method for judging the high-altitude parabolic trajectory by the millimeter wave radar, and the feasibility and reliability of evaluating the high-altitude parabolic behavior are greatly improved.

The invention relates to the technical field of an applet platform of WeChat, and in particular to a method for displaying a parabolic animation effect when a commodity is added to a shopping cart based on the applet platform of WeChat. The method comprises the steps of when a right side is clicked to add a commodity shopping cart, obtaining a click position, a position of a page where a pellet islocated and a position where the pellet is going to run; running the defined pellet to the click position at a background and displaying the pellet; then obtaining a value of y according to the valueof x during running on the basis of a formula (y=a*x*x+b*x+c), wherein the values of a, b and c can be calculated according to a starting point and an ending point; and finally running the pellet byuse of left and top animations to form a parabolic trajectory. With the method, the problem of no graphic animation effect addition running according to the parabolic trajectory when the commodity isadded to the shopping cart based on the applet platform of WeChat is solved.