242results about How to "Accurate calculation" patented technology

A driving assistance apparatus assists turning operation of a vehicle at an intersection by taking critical variables into account. The apparatus first estimates friction coefficient of a road to determine a suitable acceleration in turning, and then calculates a required period of time to finish turning by using other variables such as a width of the road derived by one of the functions of the apparatus. Based on the comparison with the time that the oncoming vehicle in the opposite lane will take to arrive at the intersection and the required time for turning, driving assistance for the vehicle to turn safely at the intersection can be appropriately provided.

The invention discloses a method and a system for automatically identifying readings of pointer type meters, which solve the problem that the prior meter reading identifying method needs relatively much known information and the reading is difficult to identify under the conditions that part of the graduation line is lost and the meter inclines and the like. The method comprises the following steps of: building graduation searching tables of different meters so as to form a database; acquiring images of the meters, inputting the images of the meters and preprocessing the images so as to extract the effective identification areas of the meter dial plates; extracting pointers and graduation lines from the effective identification areas of the meter dial plates according to the stroke characteristics of the graduation; and matching the extracted graduation lines with the corresponding graduation searching tables in the graduation searching table database according to the extracted pointers and graduation lines so as to automatically identify readings. The method has small dependence on known information of the meters, good commonality, strong robustness and relatively strong adaptability to the conditions such as transverse moving, rotating of the meters, noise interference and the like and accurate meter reading acquisition.

A closed loop infusion formulation delivery system for controlling a biological state in the body of a user includes a sensor for generating a signal representative of measured parameters and a computing element for processing the generated signal. The computing element adjusts control parameters within an algorithm, calculates a delivery rate of an infusion formulation and generates commands based on the calculated delivery rate. A remotely located monitoring station communicates with the computing element via radio or wire to further adjust the control parameters within the algorithm to meet changing needs in the body of the user.

The invention discloses a finite element simulation method for shot-peening strengthening deformation based on ABAQUS. The method comprises the following steps: during the ABAQUS dynamic display, establishing a shot-peening strengthening residual stress finite element model through a shot impacting method; simulating by using the shot impacting method, so as to obtain the residual stress distribution under different shot-peening processing parameters; then, taking the stress distribution result as an equivalent load to be input to the shot-peening strengthening finite element model in a manner of initial stress, and using a user subprogram SIGINI provided by the finite element software ABAQUS to define an initial stress field during the inputting process, wherein the subprogram can define the initial stress in a specific area of the finite element model; solving the initial stress by adopting a static resolver of the ABAQUS after the initial stress is defined, so as to obtain the deformation situation of a component under the action of the given initial stress. The finite element simulation method provided by the invention lays the foundation of the optimization of processing parameters, has the characteristics of being quick, low in cost, simple, convenient, feasible, and accurate in computation, and is excellent in practical engineering application effect.

Systems and methods for accurately calculating radiation doses in biological tissues exposed to a radiation source are provided. In the systems and methods first, a radiation dose is computed to geometry of water equivalent medium of the biological tissues, expressed in computed tomography (CT) volumetric images. A Medium-Dependent-Correction factor that is a function of an effective bone depth matrix and the incident x-ray beam is obtained and tabulated. Using patient material and density data derived from CT images, the effective bone thickness can be calculated from a specific x-ray source. Finally, a Medium-Dependent-Correction factor that is a function of an effective bone depth matrix is used to accurately determine the radiation dose distributions to biological tissues.

An electronic control unit inputs a side slip angle β of a vehicle body in step S11. Next, in step S13, the unit calculates, while using the side slip angle β of the vehicle body, a dynamic zero point δo for reducing a lateral force generated in the vehicle due to the side slip angle β of the vehicle body. Next, in step S14, the unit calculates a steering angle δa, which is represented by the difference between the dynamic zero point δo and a steering angle δ detected by a steering angle sensor. Next, in step S15, the unit calculates a reaction torque Tz having a predetermined relation with the steering angle δa. Subsequently, in step S16, the unit drives and controls an electric motor to generate the calculated reaction torque Tz. Thus, the unit guides a driver to a proper steering-wheel rotating direction.

The invention discloses a method for adjusting the exposure time of a camera. The method comprises the steps that an interested area is determined according to the position of the nose of a driver in a detected current frame image, and the estimated value of the brightness feature in the interested area is calculated; the estimated value of the brightness feature and the exposure time set value of a current frame of the camera are compared to obtain the difference value of the estimated value of the brightness feature and the exposure time set value; the exposure time set value of the next frame of the camera is calculated according to the difference value, and the exposure time of the next frame of the camera is adjusted according to the exposure time set value. Through the method for adjusting the exposure time of the camera, the brightness variation of images can be quickly and accurately judged according to indexes, and therefore the exposure time of the camera can be accurately calculated.

The invention relates to a method for designing a workpiece model for manufacturing aircraft sheet metal components. The method comprises the following steps: firstly extracting a neutral surface of the component, dividing into finite element meshes, and adopting the method of directly projecting to a plane of a web along the normal vector direction of the web for calculating the node coordinates of mesh units after flattening for non-web structural elements in the web profile; and adopting the constrained surface flattening algorithm based on unit equal deformation for calculating the node coordinates of the mesh units after the flattening for the web and curved edges to be flattened. The method faces to the key manufacturing procedure of the sheet metal components and provides a data source for the molding technology and the tooling design. The method can rapidly and precisely calculate the shape of the workpiece model for manufacturing the sheet metal components, thereby meeting the needs of digital manufacture. The method can effectively solve the problems of discharge and molding workpiece calculation in the digital manufacturing of the aircraft sheet metal components.

A bicycle motor control system is configured to control a drive assistance motor that can be installed on a bicycle having a drive force transmitting body. The bicycle motor control system comprises a memory device, a pedaling force detecting device, a propulsion force calculating section and a motor control section. The memory device stores a tooth count of a plurality of transmitting teeth of the drive force transmitting body. The pedaling force detecting device detects a pedaling force. The propulsion force calculating section calculates a propulsion force based on a pedaling force detected by the pedaling force detecting device and the tooth count of the transmitting teeth stored in the memory device. The motor control section controls the motor based on the propulsion force.

An embodiment in the invention discloses a method for determining a charging time. The method includes following steps: acquiring a present electric quantity L and a total electric quantity M of a battery during a charging process; if the present electric quantity L is no more than a preset electric quantity threshold value C, calculating a charging time t1 of a current-constant charging stage of the battery from the present electric quantity L to the electric quantity threshold value C and a charging time t2 of a voltage-constant charging stage of the battery from the electric quantity threshold value C to the total electric quantity M; and determining a required remaining time X for completing a charging process for the battery according to the charging time t1 of the current-constant charging stage and the charging time t2 of the voltage-constant charging stage. The embodiment in the invention also discloses a device for determining the charging time and an electronic device. By means of the method, the device and the electronic device, accuracy of calculation of the charging time of battery can be increased.

The invention provides a stratum aperture pressure prediction method based on variety earthquake attributes, which indirectly constructs the non-linear relation between the stratum aperture pressure and the variety earthquake attributes and realizes the prediction of the stratum aperture pressure. The advantages of the invention reside in two aspects. On one hand, the invention comprehensively uses variety earthquake attributes, and deducts other influence factors, like porosity, shale content, etc, while utilizing the inversed longitudinal wave speed to carry out stratum aperture pressure prediction so as to improve the prediction accuracy; on the other hand, the invention creatively uses two calculation methods to obtain the longitudinal wave speed, obtain the target sand-mud stratum longitudinal wave speed through high precision wave impedance inversion and the obtains the background longitudinal wave speed by using the DIX formula inversion. The former can relatively accurately inverts the longitudinal wave speed inside the target stratum so as to relatively calculate the effective stress Pe inside the target layer; and the later can reflect the relation between the longitudinal wave speed and the density as a whole so as to accurately calculate the overlying strata pressure Pov.

The invention discloses a tight sandstone permeability computing method based on a nuclear magnetic resonance double-stop value. T2 spectrums are inverted by measuring nuclear magnetic resonance decay curves of tight sandstone in completely water-containing and irreducible water conditions, the nuclear magnetic resonance T2 spectrums in the two conditions are contrasted, and nuclear magnetic resonance stop values of absolutely movable water and absolutely non-movable water are determined. On the basis, the relation among the content of absolutely movable water, the content of absolutely non-movable water and the permeability is analyzed, and a permeability model based on the nuclear magnetic resonance double-stop value is established. The method takes the contribution of different pore components for interstifial flows into full consideration, so that the permeability prediction accuracy of tight sandstone is improved.

Curved sensor array configurations and methods of processing the data gathered by the sensors. A 2 dimensional embodiment comprises singular ring of sensors that can monitor sources in a 2 dimensional plane. A sensor directly facing a target produces a maximum response. As the angle of a sensor relative to the target increases, the response decreases. Fitting the sensor response amplitudes to a 2D Gaussian curve and calculating the peak of the curve allows a very accurate calculation of the angular direction of the target. A 3D embodiment comprises sensors distributed over the surface of a sphere in order to monitor multiple targets in any spatial orientation. Again, the sensor amplitude data is fitted to a 3D curve or surface such as a Gaussian surface. The present invention can resolve more than one target using deconvoluting techniques.

The embodiment of the invention discloses a physical-layer-based method and device for realizing indoor positioning of a wireless network. The method comprises the steps of: acquiring the channel state information of a plurality of subcarriers of a target node based on an OFDM (Orthogonal Frequency Division Multiplexing) platform of a physical layer; calculating signal intensity according to the channel state information of the plurality of subcarriers; optimizing a propagation path loss model of an indoor environment according to the signal intensity; calculating the distance between each sending party and each receiving party according to the optimized propagation path loss model; and positioning the target node according to the signal intensity and the distances. In the embodiment of the invention, under the condition that an indoor environment multipath effect is ubiquitous, the precise channel state information is utilized to calculate the signal intensity in the wireless local area network so as to further realize the indoor positioning, the frequency diversity of the channel state information is utilized to reduce multipath attenuation and reduce the influences of the indoor environment multipath effect and frequency selective attenuation, and thus, the position information of the target node can be calculated more precisely and the positioning precision is increased.

A method of determining springback in metal forming with a fluid cell press through establishing a computational formulation to determine bend angle and compensated die radius based on factors of geometry of the part being formed, material properties of the sheet material and the forming process, and computing additional iterations of springback until a specific tolerance between the formed part angle and the desired part angle are reached.

Disclosed are an apparatus for and a method of correction color registration in an electro-photographic printer. An apparatus for correcting color registration in an electro-photographic printer, in which exposure start points of each color unit for a photosensitive drum are adjusted to superpose images developed in a plurality of colors on matching positions of a transfer belt, includes an exposure unit to project light beams on the photosensitive drum to form latent images of one or more marks for each color unit. A developing unit is also disclosed to generate developed images by developing the latent images of the marks and a mark sensing unit is provided to detect the developed images transferred on a surface of the transfer belt for a predetermined time period. A color registration controller stores information on time points at which the developed images are detected and compares the number of the time points with the number of the marks. Thus, the color registration controller controls the exposure start points in response to the compared result.

A microwave sensor and algorithm for instantaneous and nondestructive determination of bulk density and moisture content in granular or particulate materials at a single microwave frequency, especially agricultural commodities, which uses an inexpensive microwave circuit for determining the real and imaginary parts of relative complex permittivity using an algorithm for phase correction.

A system for extracting route choice preference of a user is provided. The system includes: a key route analysis unit configured to analyze history routes of all users to obtain key routes and their costs; and a user preference extraction unit configured to obtain feature routes of a certain user and their costs based upon the key routes and their costs as well as history routes of the certain user, and to extract route choice preference of the certain user based upon the feature routes of the certain user and their costs. Also provided is a method for extracting route choice preference of a user. The present embodiments enable automatic extraction of route choice preference of a user from history data, without requiring the user to preset his/her own preference.

The invention relates to the technical field of vehicle oil consumption data processing and provides a method and a system for calculating the mileage of remaining oil quantity of a vehicle. The method comprises the following steps: obtaining the vehicle driving state parameters in advance, and analyzing to obtain the driving habit parameters of a vehicle user; generating a correlation correspondence table between the road conditions and oil consumption rate parameters; obtaining current remaining oil quantity and position information of the vehicle; obtaining the road condition information of the vehicle driving path according to the current position information of the vehicle; comparing the road condition information of the vehicle driving path with the correlation correspondence table, and obtaining the oil consumption rate parameter in current driving path of the vehicle; calculating the mileage of the remaining oil quantity according to the current remaining oil quantity of the vehicle and the obtained oil consumption rate parameter; and pushing the mileage of the remaining oil quantity to terminal equipment or a user mobile phone terminal so as to realize accurate calculation of the mileage of the remaining oil quantity. The method and the system provided by the invention are suitable for various vehicle types and can be realized without refitting the vehicle, thereby bringing convenience to the user.

A current waveform for an electronic circuit is calculated from a description of the circuit at a given level of abstraction without requiring a detailed simulation. In one embodiment, the waveform is estimated without using test vectors, and uses an analysis time step or “granularity” that is much shorter than a clock cycle. The method is applicable for calculating worst-case instantaneous current.

The invention relates to the field of satellite positioning application, and provides a method and a system for generating a virtual reference station based on a triangular approximation algorithm. The method comprises the following steps that: A, a mobile station sends current GPS positioning data to a control center in real time through a wireless communication network; B, the control center calculates a coordinate position of the virtual reference station by using the triangular approximation algorithm according to the current position of the mobile station, and generates approximation track record; and C, the control center calculates differential correction data of the virtual reference station according to the differential correction data of a reference station and the approximationtrack record of the virtual reference station. The method and the system calculate the coordinate position of the virtual reference station by using the triangular approximation algorithm and calculate the differential correction data of the virtual reference station by using the approximation track record, thereby realizing accurate real-time calculation of the virtual reference station.

A three-dimensional analyzing device includes a first beam source for generating a first beam, a second beam source for generating a second beam, an optical system for spatially overlapping the first and second beams at least partly and irradiating the beams onto a specimen to three-dimensionally confine a photoactive region in a specimen, and a photo acceptance element for accepting a response light emitted from the photoactive region. Preferably, the device further includes an operation unit for calculating a correlation function of a response light in the time domain based on the output of the photo acceptance element to analyze a desired physical value of the specimen.

The invention discloses a privacy matching method based on exchange encryption in a social network. The problem that both parties and multiple parties in an existing mobile social network cannot effectively carry out safe privacy matching is mainly solved. The implementation process comprises the steps that (1) a communication system framework of a user and a dynamic IDA is built to distribute a dynamic ID to the user at regular intervals; (2) an initiator user verifies the dynamic identity of a responder user; (3) the exchange encryption and comparison are carried out on the personal attribute of the initiator user and the personal attribute of the responder user; (4) the initiator user calculates the matching similarity of the initiator user and the responder user, and whether matching is allowed to be carried out or not is determined through comparison between the matching similarity and a threshold value. According to the method, the number of the common attributes of the users and the priority of the corresponding attributes are considered at the same time, the privacy of the users is protected, meanwhile, the matching efficiency of the users is improved, the users can find a friend matched with the users best accurately, efficiently and safely, and the method can be used in the mobile social network.

Signal processing circuit is position-sensing detector with its four pins connected to I/V converter, multiplier, low-pass filter and A/D converter respectively in series. The four routes are connected to single chip in parallel. A/D converter is connected to feedback end of square-wave generator, and output end of square-wave generator is connected to input end of multiplier in each router. Detecting method is as following: modulated by square-wave in certain frequency, beacon light is transmitted at transmitting end. Following operations are carried out at receiving end: receiving modulated light by the position-sensing detector, its output is connected to I/V converter; output of the I/V converter and square-wave are input to multiplier; result from the multiplier through filter and A/D converter is converted to four routes, which are input to single chip to calculate position information. Feedback control and differential processing remove background noise and dark current.

The invention belongs to the technical field of glass performance testing, and relates to a method using a dilatometer to measure the electronic flat glass shrinkage. The method comprises the following steps: measuring the length of a sample to be measured by a screw micrometer, then placing the sample into a dilatometer, carrying out heating-cooling-heating according to a certain temperature, cooling the sample to the room temperature; reading the shrinkage amount after the sample is cooled to the room temperature and the sample temperature becomes stable, using the average value of last six values so as to minimize the error, and finally calculating the glass shrinkage. According to the provided method, the built-in software testing function of the dilatometer can record the change of length after heating, thus the glass shrinkage can be calculated, and the method has the characteristics of simple operation and high measurement precision.

The invention relates to a method for predicting CO2 distribution in four-dimensional seismic data in CO2 geological sequestration. The method comprises the following steps: (1) simulating fluid elasticity parameter calculation under change conditions such as different underground stratum temperatures, pressures and brine mineralization degrees; (2) establishing a relation or a formula among elasticity modulus, shear modulus and pressure of dry rock based on a rock physics test of a rock core; (3) improving a fluid replacement method based on a Gassman equation; (4) carrying out shale correction on stratums; (5) utilizing different fluid replacement methods according to different CO2 filling manners based on fluid replacement calculation of a well model filled with CO2; (6) carrying out environment correction and high-precision depth-time conversion on logging information, simultaneously, calculating ray parameter gathers or angle gathers, and manually synthesizing a seismic record; (7) establishing a gradient-intercept crossplot of CO2 saturability and pressure change, and picking up CO2 fluid identifying factors changed along with the pressure change and the saturability change; and (8) applying the CO2 fluid identifying factors to actual seismic data, so as to identify and predict the underground CO2 distribution. According to the method, the distribution of CO2 sealed underground can be identified and predicted.

The invention discloses an SOC (state of charge) reference trajectory based energy management method for plug-in hybrid electric vehicles. The SOC reference trajectory based energy management method includes the following steps: predicating the vehicle speeds, planning time-dependent SOC trajectories of the plug-in hybrid electric vehicles, and introducing model predication control for SOC trajectory constraints. The SOC reference trajectory based energy management method has the advantages that a long short term memory neural network, as a variant of a recurrent neural network, inherits the advantages of the recurrent neural network in processing time series, and has an additional long-term prediction ability; the correspondence relationship between SOC reference trajectories and the vehicle speeds is established, the method can well adapt to the influences of the change of the traveling speeds in different time periods on SOC declining trajectories, the calculation of the reference trajectories is accurate, and accordingly, optimization results are accurate; the optimization algorithm based on the SOC reference trajectories has higher implementability than a global optimization algorithm.

A method of dynamically correcting a residual electric quantity based on a cell characteristic is disclosed. A technical main point of the invention is characterized in that a power cell with a current acquisition unit, a temperature acquisition unit and a high voltage acquisition unit and a cell characteristic data memory cell are used; based on disadvantages and limitation of an existing residual electric quantity analysis method, a residual electric quantity method which is suitable for engineering is provided. In the method, an ampere-hour integral method and an electromotive force method are combined through a weighting factor. According to the cell characteristic, a set of dynamic adjusting weighting factor strategy is provided. By using the method, a disadvantage that the ampere-hour integral method is easy to achieve divergence is effectively overcome; and precision of residual electric quantity estimation is increased. Through a real vehicle, validity, practicality and feasibility of the method are verified.

Disclosed is an active sonar system capable of estimating a direction and a range of a target by using a sound pulse. A target range error can be estimated by the active sonar system, by applying a principle that a sound pulse used to detect an underwater target with consideration of a vertical structure of a sound velocity in water is reflected and refracted through a multipath not a linear path.

Analysis of electromagnetic (or acoustic) multipath propagation inventively confines the assessment of multipath propagation to a “surface interactive region” (“SIR”), intermediate the target and transmitter and/or the target and receiver. The down range time of the propagation, translatable to range distance, is related to error associated with such restriction. A SIR scope is selected commensurately with acceptable error. Jointly disclosed (practicable therewith or thereapart) is inventive focus upon the transmitter-to-target propagation (transmitted propagation reaching target via both direct pathway and forward scattered pathway) and the target-to-receiver propagation (re-transmitted propagation reaching receiver via both direct pathway and forward scattered pathway). Transmitter-to-target propagation is calculated using conventional multipath modeling technique. The target's overall scattered field is calculated using the calculated transmitter-to-target propagation in conjunction with qualitative electromagnetic/acoustic target information. Target-to-receiver propagation is calculated using conventional multipath modeling technique and/or the reciprocity principle as applied to the calculated transmitter-to-target propagation.