100 results about "Force method" patented technology

The invention discloses a real-time trajectory planning method for an autonomous vehicle. The real-time trajectory planning method comprises the steps of: S1, acquiring relevant information of the autonomous vehicle in real time; S2, generating a reference trajectory, a feasible trajectory cluster determined by means of the reference trajectory and a speed corresponding to each feasible trajectoryin the feasible trajectory cluster based on the relevant information of the autonomous vehicle; S3, calculating an action of each feasible trajectory according to the feasible trajectories and the corresponding speeds thereof by utilizing a target optimization function taking safety and efficiency as targets, and selecting the feasible trajectory with the least action as the expected optimal trajectory, and carrying out optimization to obtain an expected optimal velocity corresponding to the expected optimal trajectory, wherein the target optimization function is obtained according to the principle of least action and an equivalent force method. The real-time trajectory planning method can enable the autonomous vehicle to imitate driving features of a driver in an unknown environmental condition, and can plan a trajectory that best meets the driver's driving expectation by taking the safety and efficiency as the driving targets according to the surrounding vehicles and environmental information in real time.

The invention discloses a design method for longitudinal pre-stressing tendons of a variable-cross-section pre-stressed concrete continuous bridge. The optimization design method for the longitudinal pre-stressing tendons of the pre-stressed concrete continuous bridge is built based on the design principle of the pre-stressed degree and through combining an analytic method with a finite element method and compressively considering dead load and live load action effects. A three moment equation of the variable-cross-section pre-stressed concrete continuous box girder bridge is established to solve the internal force of the structure under the action of the self weight on the basis of the average bending moment method. A calculation formula of pre-stressed effective pre-pressure is built through a load equal effect method and a unit load method; a creep effect calculation formula is built through a force method; the temperature effect and the automobile load effect are calculated through the finite element method; and a variable-cross-section statically indeterminate structure pre-stressing tendon reinforcement calculation formula is obtained through combination of the stress ratio with the definition of the competitive pre-stressed degree.

A vehicular safety belt use reminding and forcing system comprises a safety belt buckle sensor, a seat weight sensor, a safety belt extension amount sensor, a light sensor, a control unit and a reminding and enforcing device, wherein the control unit is used for judging whether a driver and passengers are on seats or not according to borne weight of seat cushions, and judging whether the driver and the passengers wear safety belts or not according to the safety belt buckle state, the safety belt extension amount and the relation between the safety belt light intensity and in-vehicle reference light intensity. When judging that the driver and the passengers are on the seats but do not wear the safety belts, the control unit controls the reminding and enforcing device to be started so as to remind and force the driver and the passengers to wear the safety belts. The invention further provides a vehicular safety belt use reminding and forcing method. The system and the method are capable of urging the driver and the passengers to develop the habit of wearing the safety belts.

Methods are provided for regulating tooth movement and for maintaining or improving tissue health using heavy forces. Such methods comprise allowing a heavy force to be exerted on one or more teeth of a patient in need thereof; and administering an effective amount of light to the maxillary or mandibular alveolar bone of the patient, wherein the light is administered before, during, or after the heavy force is exerted. The light can have a wavelength in the range of about 585 nm to about 665 nm, or about 815 nm to about 895 nm. An apparatus useful for providing light therapy is also provided.

The invention discloses a performance testing device and a method for a petroleum drilling impact device. The testing device comprises a to-be-tested impact device, which comprises a mud pump, a sensor and a data processing unit; wherein the mud pump is connected with the liquid entrance end of the to-be-tested impact device, and by the adoption of an impact force method, the sensor is used for directly determining the impact force and the impact frequency of the to-be-tested impact device of a different model. According to the performance testing device, a mode combining the sensor and data converter is adopted, a impact force method is adopted, and the impact force and the impact frequency of the to-be-tested impact device of a different model can be directly measured; a pressure sensor can also be used for measuring the drilling liquid entrance pressure, the exit pressure, and the upper cavity pressure and the lower cavity pressure of a cylinder body, and a flow sensor is used for measuring the exit flow of the impact device. By measuring the pressure difference of a cylinder body upper cavity and a cylinder lower cavity, impact power and an impact end speed are calculated. The testing method has the advantages of accuracy, rapidness and convenience.

Methods and apparatus for enabling a coil to be used to provide a net force along more than one axis are disclosed. According to one aspect of the present invention, an actuator includes a magnet assembly and a coil assembly. The coil assembly moves at least partially within the magnet arrangement, and includes a top coil half and a bottom coil half. The top coil half and the bottom coil half are independently controllable such that a first current applied to the top coil half may be independently applied from a second current applied to the bottom coil half.

The invention discloses a slide face boundary method for calculating the slope stability. In the slide face boundary method, only a slider is taken as a calculated object for slope stability analysis. The invention further discloses a comprehensive glide force-antislide force stability coefficient calculation method and a main glide force method based on the slide face boundary method. The method disclosed by the invention has the advantages that the non-convergence problem of an existing slope stability calculation method is solved, the slope step-by-step stability failure analysis, realizes easy calculation can be implemented, the calculation results with a conventional limited equilibrium slice method can be compared, and new stability coefficients have different physical significances, so that the current slope monitoring results can be applied to the slope stability evaluation.

In order to solve the problem of local minimum of a virtual force-based route planning method and realize real-time adaptive planning parameter setting in the planning process, the invention provides a fuzzy virtual force (FVF)-based unmanned plane route planning method. In the method, the real-time adaptive planning parameter setting is performed by combining a Bayesian network and fuzzy logic inference, and the problem of local minimum of the virtual force method is solved by a threat combination method. The fuzzy virtual force-based unmanned plane route planning method comprises the following steps of: 1) setting initial conditions for unmanned plane route planning, including planning an initial point, a target point, and thread distribution and attributes; 2) setting an iterative step of the unmanned plane route planning; 3) setting planning parameters so as to determine a relationship between a virtual repulsion coefficient and a virtual attraction coefficient; 4) performing route planning; and 5) judging whether the local minimum appears, if so, performing thread combination, otherwise, continuously performing route planning until the target point is reached.

The invention relates to a milling processing method for the inner molding surface of an opening end head of a thin-walled structural member, which is characterized by comprising the following steps of: 1) putting a thin-walled structural member on a working table top of a milling machine with a locating benchmark surface as a bottom surface; 2) processing a web plate to reach the required dimension during a rough processing course, and reserving a 3-5 mm allowance on the edge strip; 3) mounting the web plate at a part pressing position of a pressing plate by adopting a multi-press point small-clamping force method with the top end of the edge strip as a pressing point in the finish machining process, and lining the outside of the web plate through an auxiliary support; 4) beginning from the end head of the opening of the part while cutting the inner molding surface of the end head, and processing in a layering and segmenting manner with small allowance, cutting in and cutting out in an arc while feeding the knife, and cutting in and cutting out for about 10 mm on each segment; 5) processing the middle part of the part by a common integral layered milling method after milling 2-3 segments. The method is used for changing the processing orbit of a vertical milling tool at the end head, so that the processing method is more scientific and safer.

The invention discloses a driving risk identification method based on track prediction, and the method comprises the following steps: S1, obtaining the GPS information in real time, and generating a reference track; S2, according to the reference trajectory and GPS information, in combination with a vehicle dynamics model and a control constraint condition, generating a feasible trajectory set which is dynamic and is connected with the initial end of the reference trajectory and the terminal and a speed corresponding to each feasible trajectory in the feasible trajectory set; S3, optimizing the feasible track and the corresponding speed; S4, calculating the cost values of the feasible tracks by using a cost function according to the optimized feasible tracks and speed in combination with avehicle dynamics model and a set constraint condition, and forming a probability distribution diagram of the own vehicle driving on each feasible track, thereby drawing a feasible track distributiondiagram; Wherein the cost function is obtained according to a minimum action principle and an equivalent force method; And S5, according to the feasible track distribution map, calculating a relativeequivalent force by using the vehicle dynamics model and the track steering probability, so as to identify the dynamic risk range in the driving process according to the relative equivalent force. Themethod comprehensively considers the coupling relationship among human, vehicle and road elements, can be suitable for accurate identification of the driving risk range, and provides support for driving decision.

The invention discloses an impact strength and fatigue analysis method of a transmission differential. The impact strength and fatigue analysis method comprises three parts including a pretightening force method of a cone bearing along with temperature, a circumferential 20-bisection and impact strength analysis method of the differential and a fatigue life analysis method. Since transient stress generated by actually rotating a differential shell for one circle is difficult through an analogy method, the impact strength and fatigue analysis method uses a method that the engaging position of a main-reduction gearwheel is bisected into 20 parts circumferentially to combine quasi-static analysis results to obtain a transient stress course that the differential shell rotates for one circle, so that the transient stress generated by actually rotating the differential shell for one circle is simulated, each torque level of a finished automobile load spectrum and a corresponding rotation circle number are combined, linear scaling is carried out on a stress analysis result according to a load ratio of load to stress analysis, finally, the fatigue loss of each torque level is finally overlapped, and fatigue endurance life in a differential shell working process, i.e., under the load spectrum, is calculated. The defect that differential shell is subjected to over design or the service life can not meet a practical working condition can be solved.

The invention relates to a flower forcing method enabling blossom of rhododendron lapponicum in Spring Festival. The method comprises the following steps: preparing a greenhouse, processing the potted rhododendron lapponicum before flower forcing, controlling the temperature, humidity, illumination, ventilation, moisture, fertilizers and sterilization management in the greenhouse when buds appear, managing the temperature and humidity when the buds show colors and the like. The method provided by the invention is simple and practical, is easy to operate, can be used for accurately controlling the flower forcing time of the rhododendron lapponicum in Spring Festival within 30-42 days and shortening the flower forcing time and is a key technology in the large-scale production of rhododendron lapponicum.

The invention relates to a micro-thrust measuring device with on-line calibration and locking functions. The micro-thrust measuring device is used for the parameter testing of the ground long-life test of a Hall effect thruster. In order to measure the real-time thrust value of the Hall effect thruster under a plurality of working conditions in the long-life test process of the Hall effect thruster, a thruster to be tested is installed on a movable frame; the movable frame swings with low amplitude under the action of the thrust of the Hall thruster; the displacement sensor of an electromagnetic feedback assembly performs detection; swing displacement signals are inputted into a PID feedback control circuit; and an electromagnetic feedback force is in linear relation with coil current outputted by the PID circuit; the static characteristic of a thrust frame is calibrated through a standard mass weight in advance, so that the magnitude of the thrust can be obtained. According to the device of the invention, the electromagnetic feedback force method is adopted to carry out multi-times and multi-working-condition real-time on-line measurement on the Hall effect thruster; an on-line calibration and locking device is adopted to lock and unlock the micro-thrust measuring device a plurality of times, so that the static characteristic of the micro-thrust measuring device is obtained inreal time, and the accuracy and reliability of a thrust test are ensured.

The invention provides a design and calculation method for an initial support of a tunnel initial support bearing all design loads. The design and calculation method is characterized in that the initial support of the tunnel initial support bearing the all design loads is designed and calculated by adopting two methods, namely "two hinged arches + 2x2 chain poles + elastic resistance", and "two hinged arches + 10x2 chain poles"; the calculation of the method makes the "structure" completely correspond to the "loads", and makes the corresponding relationship between "measures" and "problems" established on site clearer, and the purpose is more explicit; the method adopts a force method to calculate, thus complete structural internal forces and a displacement function relationship can be obtained, and the change rule of the structural internal forces and displacement can be reflected explicitly; and besides, a familiar general theory is adopted, which can facilitate technical personnel on site to design and calculate the tunnel initial support, and provide a theoretical basis for the development of a construction plan.

Methods and apparatus for adjusting a push point of an actuator such that the push point more closely corresponds to a center-of-gravity of a stage being driven by the actuator are disclosed. According to one aspect of the present invention, a method for scanning a stage device which includes a stage, as well as an actuator which has a first coil and a second coil, includes driving the stage using the actuator and determining when driving the stage using the actuator includes driving the stage through a first location associated with the stage. The actuator is arranged to drive the stage through a push point associated with the first coil and the second coil. The method also includes altering the push point when it is determined that driving the stage using the actuator does not result in the stage being driven through the first location associated with the stage.

The invention provides a pile-soil interaction and pile-end soil constitutive model and a parameter determining method thereof, and provides a force method and a displacement method for foundation pile calculation. A pile body constitutive model is the existing linear or elastic-plastic model. With the adoption of the model, the bearing force feature of foundation piles under various geological conditions such as the condition that the bearing force of a pile top is not greatly increased after increasing the pile length in a clay area can be simulated, thus the broken position of a pile body can be determined, the foundation pile design and other features can be optimized, and as a result, the development of the design and construction can be conveniently carried out.

The invention relates to a forced method of alarming automatically and starting the automatic aerator or bait releasing device when the microprocessor compose of frequency selection circuit, Doppler effect detecting circuit, multistage clock, numbering, and comparing circuit or thermorelay equipped with heating element identifies head floating or food searching by employing sound, light, electrical wave or other wave vibration transducers construct a certain working surface, and employing cultivating creature swimming into the working surface to make the transducers generate induction; and a method of starting the automatic aerator automatically by the microprocessor with functions of measuring illumination intensity and head floating time, storage, calculating, comparing, presetting and timing. The two methods can be combined used in a machine and develops various functions of alarming the state of the cultivating mechanism and order self control, and one monitor can monitors several machines or several cultivating water surface or out of the place. In addition, there is a method of improving the reliability of the automatic aerator by employing the small power aerator to induce the cultivating creature with head floating to approach to the transducer.

The invention discloses an immersed boundary implicit iterative solving method meeting no-slip boundary conditions and continuity conditions; the method mainly comprises the steps of using a viscous incompressible flow N-S control equation, expanding a momentum equation along a feature line to perform time discretization, using a finite element method to perform spatial discretization, and adding additional body force to the discretized control equation; using a direct force method to solve the additional body force so that interpolation speed on the boundary is equal to expected speed distribution; when a fractional step method is in use, dividing the additional body force into two parts according to whether it is coupled to pressure, and solving the two parts respectively; performing speed correction in iterative computation of the additional body force and pressure to obtain final flow field distribution. The problem of an existing immersed boundary method that no-slip boundary conditions and continuity conditions cannot be met at same time is solved; after the additional body force is divided into two parts, the cost of solving a component item uncoupled to the pressure is effectively reduced, and the computing efficiency of the immersed boundary method is improved.

The invention relates to a rhododendron lapponicum flower forcing method in cold regions. The method comprises the following steps of: carrying out low-temperature dormancy treatment on potted rhododendron lapponicum outdoors by utilizing climatic resources in cold regions; carrying out indoor greenhouse space arrangement; breaking dormant flower forcing management, removing lateral buds and spraying 1000ppm of exogenous hormone GA3 to germinating buds; carrying out heating, filling light to regulate room temperature, humidity and illumination in the greenhouse and carrying out water and fertilizer management; and managing the temperature, humidity and water and fertilizer after the buds have colors. The method has the following beneficial effects: by utilizing the peculiar climatic resource advantages in the cold regions to carry out low-temperature dormancy treatment on rhododendron lapponicum outdoors and using variable temperature light filling indoors in combination with the exogenous hormone, the aims of shortening the rhododendron lapponicum flower forcing time in the cold regions and reducing the production cost are achieved; the key problem of rhododendron lapponicum flower forcing in the cold regions is solved; and the technology caters to the lunar new year flower market demands and provides technical support for industrial production of potted flowers in the Heilongjiang province.

The invention provides a static testing method for obtaining the vibration stress of a rotor vane of an engine under noise excitation. The method comprises the following steps: simulating the noise excitation by using a travelling wave sound field; simulating a vane root force boundary caused by a rotational speed by a vane root jacking force method; obtaining the largest mean square root principal stress at a part with the largest vibration stress of the rotor vane by a dynamic strain testing means. By the method, the vibration stress under the noise excitation and each fixed physical speed of the rotor vane can be tested, the direction of the noise excitation of the rotor vane can be conveniently considered, the experimentation cost is lower, multiple problems, for example, a high-power motor is needed for driving, and a costly annular electric brush is needed to lead out a strain signal which are caused by the fact that a noise excitation test is performed under the situation that the rotor vane rotates are solved, and the problem that the sound field is difficult to control under the situation that the rotor vane rotates is also solved.

The invention belongs to the technical field of plant culture, in particular to the technical field of Luna culture. A flower forcing method for Luna comprises the following steps: irrigating with water solution containing 1-1.2g/L ethephon, 0.3-0.4g/L gibberellin and 0.5-0.7g/L monopotassium phosphate to the leaf cup once each day, continuously irrigating twice and pouring off the water in the leaf cup, and after one day, continuously irrigating with the water solution twice; irrigating at night, during the period of irrigating the fertilizer, controlling the temperature each day to be 20-24DEG C, and after the period, controlling the temperature to be DEG C. The invention is applied to flower forcing of Luna; the flowering rate reaches 98.8% and the average diameter of the flower diameters reaches above 20cm; therefore, the Luna can be compared favorably with like product; the market value of the Luna is increased; and each basin of Luna costs above 35 Yuan.

The invention provides a calculation method for interaction of waves and an arc-shaped plate type groyne. According to the method, pressure-implicit with splitting of operators (PISO algorithm) is implemented, a prediction step and two modification steps are carried out, pressure is adjusted through iteration, then an internal fluid unit meets continuous equations, a free surface unit meets free surface power boundary conditions, and meanwhile a speed field is adjusted; compared with a conventional calculation method for interaction of the waves and the arc-shaped plate type groyne, the calculation method has the advantages that the calculation efficiency is high and value results are relatively approximate to physical practice since a speed field is modified by using the PISO algorithm, variable information is arranged based on alternative grids, and interaction of the waves and the arc-shaped plate type groyne is simulated by using a virtual boundary force method through central difference method discrete control equations.

The invention relates to a spoke type force measuring wheel pair based on a sensor, which comprises a force measuring wheel, a connecting shaft, a sensor and a clamping device, wherein the force measuring wheel has a uniform thickness spoke type structure which can improve the measuring sensitivity. The invention overcomes the shortcomings of the surface pasted strain gage caused by the traditional force measuring wheel pair, only requiring to tightly clamp the sensor on the force measuring wheel spoke through the clamping device after being processed in a precise workshop. The vertical and lateral forces loaded by the force measuring wheel can be dynamically measured at real time through a pressure method and a shearing force method. The force measuring wheel pair of the invention is convenient to assemble and disassemble, is easy to maintain and exchange, greatly increases the measuring precision, and avoids the known shortcomings that the force measuring wheel pair is difficult to manufacture, difficult to maintain and repair and is expensive to manufacture.