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242results about How to "Accurate calculation" patented technology

Method and system for automatically identifying readings of pointer type meters

InactiveCN101620682AOvercome the disadvantages of relying on known informationAccurate calculationCharacter and pattern recognitionSpecial data processing applicationsComputer visionAlgorithm
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.
Owner:HANVON CORP

Finite element simulation method for shot-peening strengthening deformation based on ABAQUS

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.
Owner:NORTHWESTERN POLYTECHNICAL UNIV +1

Stratum aperture pressure prediction method based on variety earthquake attributes

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.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY +1

Physical-layer-based method and device for realizing indoor positioning of wireless network

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.
Owner:SUN YAT SEN UNIV

Method and system for calculating mileage of remaining oil quantity of vehicle

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.
Owner:SIJIAN TECH CO LTD

Privacy matching method based on exchange encryption in social network

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.
Owner:XIDIAN UNIV

Method for predicting CO2 distribution in four-dimensional seismic data in CO2 geological sequestration

ActiveCN104678438AAccurate elastic propertiesAccurate calculationSeismic signal processingGeological sequestrationEnvironmental geology
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.
Owner:NORTHWEST UNIV

SOC (state of charge) reference trajectory based energy management method for plug-in hybrid electric vehicles

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.
Owner:DALIAN UNIV OF TECH

Surface interaction region methodology for delimiting multipath propagation inquiry

InactiveUS7026981B1Accurate calculationReducing modeled domainRadio wave reradiation/reflectionComputational physicsForward scatter
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.
Owner:THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY
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