36results about How to "Optimize trajectory" patented technology

In a golf ball having, on a spherical surface, numerous dimples in a plurality of types of differing diameter, the dimples include smallest size dimples having a diameter of 2.7 mm or less and largest size dimples having a diameter of 4.3 mm or less. At least 50% of the total number of dimples are dimples in which an arc that connects mutually opposing positions on a wall of the dimple at a 70% dimple depth level with a deepest position on the dimple wall has a radius of curvature R of at least 15 mm.

The invention relates to an impact reducing tail-section linear explosion separating device for a small-diameter assisted takeoff rocket. The impact reducing tail-section linear explosion separating device comprises a detonator, a split type detonating connector, an impact reducing shell, an explosive fuse, a glass protective cover and energy absorption pads. The split type detonating connector comprises a detonating mounting seat, transition studs and an explosion connector, the impact reducing shell comprises an upper shell, impact reducing pads and a lower shell, and a particular connection relation includes that the impact reducing pads are placed between an end frame of the upper shell and an end frame of the lower shell and are fixedly connected with the upper shell and the lower shell by the end frame of the upper shell and the end frame of the lower shell; an outer mounting surface of the protective cover and the inner surface of the lower shell are matched with each other to be radially positioned, and a positioning ring of the protective cover and a positioning surface of the lower shell are matched with each other to be axially positioned; the explosion connector is connected with the protective cover and the lower shell, the detonating mounting seat is mounted on the end frame of the upper shell, lower threaded rods of the transition studs are screwed into the explosion connector, and upper cylinders of the transition studs are connected with the detonating mounting seat. The impact reducing tail-section linear explosion separating device has the advantages that the separating device is small in structure dimension, convenient to mount and check and high in separation efficiency and safety performance, and has an excellent heat environment, and separation impact can be greatly reduced.

An autogenous system for controlling pressurization of a propellant tank in a pressure-fed propulsion system. The system includes at least one micropump that pumps a high vapor pressure liquid propellant or a propellant with low temperature critical point from the propellant tank into an engine in which a small portion of the propellant is evaporated and heated. The micropump controls a pressurization rate of a flow of the propellant. A method of controlling pressurization of a propellant tank in such a system includes pressurizing a propellant tank containing a high vapor pressure liquid propellant or a propellant with low temperature critical point; controlling a flow of a small amount of the propellant from the propellant tank to a combustion chamber using at least one micropump; heating and vaporizing the propellant in a heat exchanger; and using the micropump to control the amount of propellant vaporized and heated, thereby controlling the pressurization rate.

A method for assisting in the navigation of an aircraft comprises steps of calculating and displaying a linear deviation on a first linear section and an angular deviation on a second angular section. The method comprises a step of calculation of an anticipated deviation of the aircraft, expressed linearly or angularly, projected to a time DT, characteristic of a reaction time of the aircraft, and of a statistical error distribution associated with this anticipated deviation; and a step of calculation of a probability of exceeding a predetermined target deviation, by means of the anticipated deviation and of the statistical error distribution. The method also comprises a crew alert when the probability is above a predetermined threshold.

The embodiment of the invention provides a trajectory optimization method and device. The method comprises the following steps that: an original path is determined; discrete sampling is carried out onthe original path to obtain a plurality of sampling points, the maximum drivable area corresponding to each sampling point is determined, wherein the maximum drivable area is described by adopting alinear constraint condition; path optimization is performed on the original path according to the linear constraint condition to obtain an optimized path; speed optimization is performed based on theoptimization path to obtain a speed optimization curve; the optimized path is combined with the speed optimization curve, so that an optimized trajectory can be obtained. Compared with calculation ofthe distance between two convex polygons, the calculation of the maximum drivable area is lower in complexity, and therefore, path optimization can be rapidly achieved; and therefore, trajectory optimization can be quickly carried out, and the trajectory optimization efficiency is improved.

The invention relates to a multi-planting arm transplanting mechanism with a modified elliptical gear, which belongs to the technical field of agricultural machinery. The multi-planting arm transplanting mechanism comprises a central shaft, wherein two ends of the central shaft respectively extend out from two sides of a transmission case, and are fixedly connected with a rotary box body, a central gear of the rotary box body is fixedly connected with the transmission case, and respectively meshed with at least two planetary gears which are uniformly distributed along the circumference through idle gears, the planetary gears are coaxially and fixedly connected with planting arms respectively, and each planting arm is internally provided with a seedling needle extending out of one end. The multi-planting arm transplanting mechanism is characterized in that a pitch curve of the central gear consists of at least two sections of modified elliptical curves which are in smooth transitional connection, and the pitch curves of the idle gears are conjugate with the pitch curves of the central gear and the planetary gears. After adopting the multi-planting arm transplanting mechanism, a larger 'winding and buckling' track is formed under the condition of meeting the transplanting requirements of paddy rice with wide row spacing, so as to properly solve the existing technical problems, and ensure the quality of paddy rice transplanting.

The invention provides an unmanned aerial vehicle active eavesdropping method combining trajectory and interference power optimization, aiming at the influence of trajectory change of an unmanned aerial vehicle on the effective eavesdropping rate of a system, an effective active interference scheme is adopted in a model, i.e., the unmanned aerial vehicle sends an interference signal to interfere asuspicious receiver while eavesdropping suspicious link information. In order to maximize the effective eavesdropping rate, the updating rate assisted block coordinate descent and continuous convex optimization technology is used for optimizing the track and sending interference power of the unmanned aerial vehicle, and then the effective eavesdropping rate is improved.

In a golf ball having, on a spherical surface, numerous dimples in a plurality of types of differing diameter, the dimples include smallest size dimples having a diameter of 2.7 mm or less and largest size dimples having a diameter of 4.3 mm or less. At least 50% of the total number of dimples are dimples in which an arc that connects mutually opposing positions on a wall of the dimple at a 70% dimple depth level with a deepest position on the dimple wall has a radius of curvature R of at least 15 mm.

An ultra-miniaturized electron optical microcolumn is provided. The electron optical microcolumn includes an electron-emitting source emitting electrons using a field emission principle, an extraction electrode causing the emission of electrons from the electron-emitting source, a focusing electrode to which voltage is flexibly applied in response to a working distance to a target for regulating a focusing force of electron beams emitted from the electron-emitting source, an acceleration electrode accelerating electrons emitted by the extraction electrode, a limit electrode regulating an amount and a size of electron beams using electrons accelerated by the acceleration electrode, and a deflector deflecting electron beams towards the target.

The present invention relates to a support system for determining a trajectory to be followed by an agricultural work vehicle when weeding distinct areas of weed within a field of crops, said system comprises:a mapping unit configured for receiving:i) coordinates relating to the boundaries of a field to be worked; andii) coordinates relating to the boundaries of distinct areas of weed being located within said boundary of said field of crops;a capacity parameter unit configured for receiving one or more capacity parameters relating to said working vehicle;a trajectory calculating unit configured for calculating an optimized trajectory to be followed by said work vehicle upon weeding said distinct areas of weed; wherein said optimized trajectory is being calculated on the basis of said coordinates received by said mapping unit; and one or more of said one or more capacity parameters received by said capacity parameter unit.

A long travel constant contact side bearing for railway cars provides better handling characteristics, achieving improved tracking and curving through use of various combinations of features. Such a long travel side bearing is able to meet recent stringent American Association of Railroads standards, such as M-976. Lowered spring rates, preferably less than 6,000 lb / in., help with stability and reduce set-up sensitivity. Reduced cap and base dimensions and spring design help achieve travel of at least 5 / 8'. A visual inspection windows allows ready inspection. Increased service life and wear characteristics are obtained by addition of hardened wear surfaces, improved tolerances, changes to Grade E steel, increase of top contact surface flatness and coped top surface peripheral edges. Standardized sets of spring components can be mixed and matched, requiring fewer specialty parts. Interchangeability of improper components can be prevented by a combination of keying features and / or spring lockout features.

A support system for determining a trajectory to be followed by an agricultural work vehicle when working a field comprises: a mapping unit configured for receiving: i) coordinates relating to the boundaries of a field to be worked; and ii) coordinates relating to the boundaries of one or more obstacles to be avoided the work vehicle; wherein the one or more obstacles being located within the field; a capacity parameter unit configured for receiving one or more capacity parameters relating to the working vehicle; a trajectory calculating unit configured for calculating an optimized trajectory to be followed by the work vehicle; wherein the optimized trajectory is being calculated on the basis of the coordinates received by the mapping unit; and one or more of the one or more capacity parameters received by the capacity parameter unit.

The invention provides a ground stress direction determination method and device, a storage medium and computer equipment. The method comprises the following steps: acquiring a rock core sample of a stratum at a target depth, measuring longitudinal wave speeds of longitudinal waves in a plurality of different diameter directions when the longitudinal waves are propagated in the rock core sample, and determining the direction of ground stress in the rock core sample according to the longitudinal wave speeds in the different diameter directions; comparing the texture characteristics of the side surface of the rock core sample with the texture characteristics of the well wall of the sampling well of the rock core sample at the target depth, and determining the relative orientation of the rock core sample and the well wall of the sampling well at the target depth according to the comparison result; and according to the direction of the crustal stress in the core sample and the relative orientation of the core sample and the well wall of the sampling well at the target depth, determining the direction of the crustal stress in the stratum at the target depth. The method is strong in theoretical basis, can be used for ground stress direction judgment of various reservoirs, especially stratums with small plastic change, and is beneficial to optimization of well body tracks and reasonable arrangement of hydraulic fracturing directions.

The invention discloses a trajectory planning method and device. The method comprises the steps of: obtaining state information required by unmanned equipment trajectory planning; determining a plurality of to-be-determined driving decisions corresponding to the state information and the decision value of each to-be-determined driving decision through a father planning model; and selecting an undetermined driving decision corresponding to the maximum decision value as a driving decision corresponding to the state information, determining a planning action for realizing the driving decision through the sub-planning model corresponding to the selected driving decision, and planning the track of the unmanned equipment according to the planning action. The trajectory planning method provided by the invention is suitable for all scenes in the prior art, does not need to determine the type of the scene, solves a problem that the scene division is not accurate and reasonable in the prior art,and achieves a beneficial effect that the unmanned equipment plans a better trajectory when achieving a driving decision corresponding to the maximum decision value.

Golf ball 1 has the diameter D of 43.0 mm or greater and 50.0 mm or less. This golf ball 1 includes a core 2 and a cover 3. The core 2 is formed by crosslinking of a rubber composition. The cover 3 is composed of a resin composition. Dimples 4 are formed on the surface of the cover 3. The specific gravity of the cover 3 is 1.05 or greater and 1.50 or less. The moment of inertia of this golf ball 1 is equal to or greater than 85.0 gcm2, and particularly equal to or greater than 88.0 gcm2. The moment of inertia is equal to or greater than the value Y calculated by the following mathematical formula (I):Y=3.57·D−68.6.   (I)The weight of the golf ball 1 is 45.00 g or greater and 45.93 g or less.

The invention provides an unmanned aerial vehicle cooperative communication method for joint optimization of power and three-dimensional trajectory. The method comprises the steps: building an unmanned aerial vehicle to ground communication system, the unmanned aerial vehicle to ground communication system comprises an unmanned aerial vehicle B, an unmanned aerial vehicle J, a ground user and an eavesdropper, the unmanned aerial vehicle B sends information to the ground user, and the unmanned aerial vehicle J sends an interference signal to the ground eavesdropper; respectively defining coordinates of the unmanned aerial vehicle B, the unmanned aerial vehicle J, a ground user and an eavesdropper on a three-dimensional Cartesian coordinate by using discretized time slots; determining an objective function (P1) of an optimization problem, and maximizing the minimum average secure transmission rate by performing joint optimization on the tracks and power of the unmanned aerial vehicle B and the unmanned aerial vehicle J in all time periods; and solving the target function (P1) to obtain an optimal solution. According to the method, the tracks and the transmitting power of the unmanned aerial vehicle J and the unmanned aerial vehicle B are jointly optimized, the average secure transmission rate of all ground users is maximized, and the physical layer security of an unmanned aerial vehicle communication system is greatly improved.

The invention discloses a UAV (Unmanned Aerial Vehicle) air computing system based on a full-duplex relay and a trajectory and power optimization method. The UAV air computing system adopts a UAV as the full-duplex relay to carry out data aggregation and forwarding; according to the method, the optimization problem under the constraints of the sensor transmitting power, the information transmission rate, the UAV track and the de-noising factor is solved by taking the minimization of the air calculation time mean square error as the target, and the overall joint optimization problem is solved. And determining each optimization variable one by one by adopting an alternate optimization method according to the high coupling of the optimization variables. According to the method, the mean square error minimization under the guarantee of the communication rate is realized, the optimization problem is decomposed into four independent sub-optimization problems, and the optimization of the UAV track and power is realized by a low-complexity algorithm.

Disclosed is a golf exercise weight machine for anaerobically strengthening the large rotary muscles of the body-including the upper thigh, trunk and abdomen, and shoulders-most used in performing a golf swing. Preferably, the device includes a floor mounted base to which a yoke is rotatably attached to fit around the shoulders and arms of a user, so that during operation the user's body remains oriented in the proper swing position so as to mimic and improve the golf swing by strengthening the appropriate muscles. A weight stack provides variable resistance during the simulated golf swing, and the device offers adjustment over multiple degrees of freedom and it can accommodate both right-and left-handed swings.

A method and a related system for allocating target locations to optimize trajectories between several objects and the target locations may be provided. The method comprises capturing location data of the target locations as well as location and movement data of the objects, building a graph using the target locations as well as the location and movement data and integrating constraints into the graph. Furthermore, the method comprises determining for each of the several objects a desired target location using a first optimization system, thereby determining endpoints of a trajectory between each of the objects and its respective desired target location and selecting for each of the several objects an optimal path as the trajectory between the object and the desired target location, using a second optimization system, and taking into account movements of other objects along their trajectories.

The invention discloses a multi-unmanned aerial vehicle path planning and spectrum resource allocation method and system, and the method comprises the steps: simulating ground terminal distribution and hotspot distribution, and obtaining a plurality of clusters; according to the distance between each unmanned aerial vehicle and each cluster and the number of the ground terminals capable of being accessed by each unmanned aerial vehicle, the unmanned aerial vehicles are configured for the ground terminals, and the network coverage rate and the data acquisition efficiency of the emergency communication system are improved through network coverage of different disaster areas and cooperation between the unmanned aerial vehicles on the same layer; based on the interference parameters of other unmanned aerial vehicles and the channel gain between the unmanned aerial vehicles and the ground terminal, calculating the data volume currently received by each unmanned aerial vehicle, and according to the data volume currently received by each unmanned aerial vehicle, in combination with the multi-dimensional influence parameters, obtaining the maximum arrangement income as the target. A COBSO intelligent algorithm is utilized to allocate frequency resources for each unmanned aerial vehicle, and the trajectory and deployment number of the unmanned aerial vehicles are optimized, so that the utilization rate of limited bandwidth resources and the life cycle of the system are improved.

According to the secure communication method for the 3D dynamic position selection strategy of the unmanned aerial vehicle provided by the invention, the anti-eavesdropping technology of the unmanned aerial vehicle based on the optimal flight path is researched by providing a scheme for solving the original traversal problem through successive optimization and converting the constraint of the movement distance and the constraint of the space coordinate movement, and the method is more in line with the actual situation and has a practical application value. The operation environment of the unmanned aerial vehicle is deepened from a 2D plane to a 3D space, so that the flight path of the unmanned aerial vehicle better conforms to the actual situation; according to the method, the constraint of the movement distance and the constraint of the space coordinate movement are converted, the scheme for solving the original traversal problem is successively optimized, the complexity is greatly reduced, and the computing resources and the computing time are saved. According to the invention, the calculation complexity is reduced, and the operation resources of the processor are saved, so that the trajectory of the unmanned aerial vehicle in the three-dimensional space is optimized.

The invention relates to a method for open-loop control or closed-loop control of a closing mechanism of a moulding machine, a motion mechanism enables a movable mould clamping plate to move, a firsttrajectory of movement of the movable mould clamping plate under open-loop or closed-loop control is calculated using a first algorithm based on operator inputs relating to the desired movement of themovable mould clamping plate and particularly predefined parameter values of a dynamic or kinematic parameter of the closing mechanism, and the movable mould clamping plate is moved under open-loop or closed-loop control according to the first trajectory. The dynamic or kinematic parameter of the closing mechanism is measured during the movement of the movable mould clamping plate according to the first trajectory, and an estimate of the parameter value is generated based on the measurement. A second trajectory of movement of the movable mould clamping plate under open-loop or closed-loop control is calculated using an optimization algorithm based on the estimate, and the movable mould clamping plate is moved under open-loop or closed-loop control according to the second trajectory. The invention also relates to a moulding machine.

The invention discloses a method for calculating the safe hole drift angle of a deflecting section of a horizontal well. The method comprises the following steps that 1, logging information is finelyexplained, and a box and the transverse structure change of the box in the horizontal direction are determined in combination with an earthquake treatment result; 2, parameters needed by calculation of the safe hole drift angle are extracted according to geological and drilling engineering design; 3, by means of the parameters in the step 2, assuming the stratum is horizontal, a well track designmethod is applied to inversely calculating the apparent safe hole drift angle between the top of the box and a certain selected position on the upper portion of the box from the box; 4, according to the change trend of the horizontal well drilling direction structure, the apparent safe hole drift angle is corrected, and the safe hole drift angle in a downhole state is obtained; and 5, the well track design method is applied to obtaining the safe hole drift angle of other levels above the level. According to the method, important parameters are provided for deflecting section well track design,and well track optimal design and safety management under the complicated geological conditions are achieved.

A method and device for optimized autonomous driving are provided. A trajectory (106) for the actuation of a vehicle (100) is determined. A profile of the trajectory (106) is defined by a bending lineof a bending band (300) . The bending line is preferably determined by the finite element method, in particular according to the principle of virtual shifting, and achieves an optimization goal and satisfies a boundary condition. The boundary condition is defined in accordance with a profile of a roadway (102) for the vehicle (100). The optimization goal is defined by a desired driving property of the vehicle (100).