48results about How to "Easy to implement programmatically" patented technology

The invention provides a data selection method for calculating the blunt round radius of a cutting edge and belongs to the technical field of the geometric feature measurement for cutting tools, which relates to a data selection method for calculating the blunt round radius of a cutting edge. According to the technical scheme of the method, firstly, the profile of the cutting edge of a cutting tool is acquired based on the microscopic measurement method, and the data point curve of the profile of the cutting edge of the cutting tool is extracted. Secondly, the fitting calculation is conducted to successively approximate the straight lines of the front and back tool surfaces of the cutting cool based on the iterative method, so that the range of the fitting data points of the blunt round of the cutting edge can be obtained. Thirdly, the blunt round radius of the cutting edge, the left distance difference and the right distance difference of the cutting edge are calculated. The above fitting calculation process is repeated for iterative computation, till the left distance difference and the right distance difference meet the iterative terminating condition. According to the technical scheme of the invention, the error, caused by the uncertain range of the fitting data points of the blunt round of the cutting edge, can be eliminated. Based on the method, the blunt round radius of the cutting edge of the cutting tool can be calculated more accurately and more really through the fitting calculation process, and the programming is easier to implement. Moreover, the measurement efficiency for measuring the passivation abrasion of the blunt round of the cutting edge of the cutting tool is effectively improved.

The invention discloses a method for automatically generating a false comment data set of Chinese commodity, which comprises the following steps: a) reading the comment data collected in advance intoa memory; B) segmenting the comment by using a word segmentation tool to obtain a word sequence representation of the comment text; C) comparing the text similarity between two commodity reviews within a given range to obtain a false commodity review set Rf1; D) executing an associated query on the comments in Rf1 to obtain a product false comment result set R1; E) extracting the name informationof the commentator corresponding to the commodity comment within a given range; (f) analyzing that name of the commentator, finding out the name of a series of commentators conforming to a certain rule characteristic, executing an associated query on the false commentator, and obtaining a product false comment result set R2; G) finally, merging R1 and R2 to obtain the final false comment data setof the commodity. The invention fully automates the detection and identification of the false comment in the commodity comment data and automatically generates the false comment data set of the commodity without manual intervention and labeling.

A process for preparing the high-grade alkanol ester for gallic acid, whose chemical formula is (HO)3C6H2COOCnH2n+1, includes catalytic reaction between gallic acid, high-grade alkanol, and solvent at 105-125 deg.C, carrying to resultant vapour out of the reactor by the evaporated solvent, condensing, removing water by millpore ceramic column, returning solvent back to reactor, continuous circulation until reaction is terminated, and recrystallizing.

The present invention discloses a virtual screening method of human transthyretin (hTTR) disturbing chemicals, belonging to the field of methods of screening environmental endocrine disturbing chemicals. According to the virtual screening process, firstly, chemicals are classified based on ten radical groups, then a disturbing effect of each chemical on the hTTR is predicted by using a quantitative structure-active relationship model, so that whether the chemical has a capability of disturbing transport of the thyroxine by the hTTR is determined according to a predicted effect value, and the strength of the disturbing capability is also determined. The process of screening the hTTR disturbing chemicals is simple and reasonable, and the method is accurate and reliable, is easy to be programmed, and can be applied to virtual screening of potential hTTR disturbing chemicals in an application domain and priority setting of potential disturbing chemicals.

The invention discloses a method for obtaining a transverse wave time difference section through logging and core data. The method comprises the following steps that (A) a target well is layered and sectioned according to lithologic characteristics; (B) the logging data of the target well and the core rock mechanical testing data of a corresponding target well section of the target well or each well adjacent to the target well are prepared; (C) the data are collated, and an observation input matrix, parameter column vectors and output column vectors are built; (D) a cubic Householder matrix isbuilt, and the observation input matrix and the output column vectors are subjected to cubic transformation; (E) a linear system of equations is built according to the transformed observation input matrix and the output column vectors, and the parameter column vectors are solved; and (F) the transverse wave time difference section of the target well is calculated according to the logging data. The method is specific to a horizontal well or a directional well which is lack of transverse wave time difference data, according to the logging data and the core rock mechanical testing data, the transverse wave time difference section of the target layer section is predicted accurately, the ill-conditioned problem in the solving process can be solved, the basis is provided for obtaining mechanical parameters subsequently, and exploiting of the target well is promoted.

The invention discloses a hyperbolic back-stepping measuring method of uniaxial tension stress and strain of a metal round bar specimen, and belongs to the technical field of mechanical property testing of metal materials. The method is based on a hyperbolic rotating body model of step-by-step expansion of uniaxial tension instability necking of the metal round bar specimen, and the standard distance elongation in the tensile process of the round bar specimen only needs to be measured, and coordinate information of the curve of the outer contour of the round bar specimen after breaking is extracted, a necking hyperbolic equation and a necking minimum section radius at each moment are calculated through back-stepping, thus the curvature radius of the minimum section at the necking positionat this moment can be obtained through a curvature radius formula, and finally, real stress and real strain at this moment can be calculated by a Bridgman method. According to the hyperbolic back-stepping measuring method, a testing and measuring link of the necking minimum section radius and the curvature radius of the outer contour in an existing method is omitted, the measurement accuracy of the stress and strain curve in a large strain range is improved, and the hyperbolic back-stepping measuring method has important significance for mechanical property testing of the metal materials.

The invention discloses a singularity treatment method for a six-degree-of-freedom articulated robot. The singularity treatment method comprises the following steps that (1) a kinematic model of the robot is built; (2) the six-degree-of-freedom articulated robot is subjected to rectangular coordinate space motion trail planning; (3) interpolating points of a motion trail are subjected to kinematicinverse solution, angles of joints of the robot at the interpolating points are obtained, and the angular speeds and angular acceleration of the joints of the robot at the interpolating points are obtained according to the relation between a jacobi matrix and a cartesian space as well as the relation between the jacobi matrix and a joint space; (4) the joint singularity condition is solved, and asingularity zone is obtained; and (5) the robot is made to smoothly pass through the singularity zone through singularity treatment. According to the singularity treatment method, the problem that the robot is subjected to singularity in the moving process, and thus, the joint angular speed is abruptly changed can be solved, accordingly, the motion smoothness of the robot is improved, and the angles and the angular speeds of the joints of the robot smoothly pass through the singularity zone.

The invention discloses a method and a system for optimizing and predicting dissolved oxygen based on hybrid QPSO-DE, and the method comprises the steps: carrying out the optimization design of parameters of a support vector machine through employing a QPSO-DE algorithm, setting the support vector machine obtained through optimization design as an optimization prediction dissolved oxygen model, and obtaining dissolved oxygen prediction data. Compared with a standard differential evolution algorithm, the invention has the advantages that the search capability is stronger, the performance is better, individuals entering the next generation in each iteration have better fitness values, the premature phenomenon of the algorithm can be effectively avoided, that is, the algorithm falls into local optimum and cannot jump out, and the global search capability of the algorithm is improved.

The invention discloses a method for constructing a coordinate transformation matrix of a multiphase motor under an open-phase fault, comprising the following steps: (1) constructing a basic vector group M0; (2) constructing a first harmonic vector group HI; (3) constructing a first specific irrelevant group MI; (4) determining and processing the first specific irrelevant group MI; (5) constructing a third harmonic vector group HIII; (6) constructing a third specific irrelevant group MIII; (7) determining and processing the third specific irrelevant groups MIII; (8) according to the method inthe steps (5) to (7), constructing a fifth harmonic vector group HV and a fifth specific irrelevant group MVs, and determining and processing the fifth specific irrelevant group MV; (9) analogizing according to the step (8). The method is easy to realize, and can quickly and accurately obtain the coordinate transformation matrix of any multiphase motor under any open-phase fault. The obtained coordinate transformation matrix can reduce the dimensionality of the multiphase motor, simplify the original model of the multiphase motor, and can be used for multiphase motor fault modeling, fault characteristic signal extraction, fault tolerance control.

Provided is a flexible spacecraft integrated modeling method. A flexible spacecraft comprises flexible accessories and a central rigid body. The method includes the following steps of firstly, calculating the antithesis momentum of the flexible accessories relative to the mass center of the flexible spacecraft under dynamic conditions through a finite element method and an integration method underthe coordinate system of a flexible spacecraft body; secondly, calculating the antithesis momentum of the central rigid body relative to the mass center of the flexible spacecraft under dynamic conditions through the finite element method and the integration method under the coordinate system of the flexible spacecraft body; thirdly, summarizing the antithesis momentum of the flexible accessoriesrelative to the mass center of the flexible spacecraft in the first step and the antithesis momentum of the central rigid body relative to the mass center of the flexible spacecraft in the second step, and calculating the antithesis momentum of the flexible spacecraft relative to relative to the mass center of the flexible spacecraft under dynamic conditions; fourthly, calculating a flexible spacecraft posture orbit integrated kinetic equation according to the momentum theorem under the inertia coordinate system.

The invention discloses an automatic measuring method for percentage elongation after single-shaft tensile fracture of a metal round bar sample and belongs to the technical field of mechanical property test of metal materials. According to the method, on the premise that the elasticity modulus and the poisson ratio of a material are known, only gauge length elongation and a load value at the tensile fracture moment of the round bar sample need to be measured and recorded, meanwhile, an optical method is adopted to collect the outer contour curve of the round bar sample after fracture, and thepercentage elongation after single-shaft tensile fracture of the metal round bar sample is obtained through elastic deformation analysis and calculation. According to the method, the elastic part is accurately deducted, without the need of identifying the fracture position in the gauge length range, a shifting method is automatically implemented, so that the percentage elongation after fracture isaccurately obtained. Compared with the existing manual measurement technology, tedious measurement links such as scribing and fixing the fracture sample are omitted, the measurement precision is improved, and great significance is achieved for mechanical property test of the metal material.

The invention discloses a dynamics modeling method and system of a space film diffractive imaging satellite. The method includes: acquiring the dual quaternion of the posture transformation among a satellite body coordinate system, an orbit coordinate system and a flexible appendage coordinate system; using a dual quaternion method to describe the dual momentum of a flexible appendage relative tothe flexible appendage coordinate system and the orbit coordinate system, the dual momentum of the central rigid body of a flexible satellite relative to the orbit coordinate system, the posture integrated dynamics model of the flexible satellite, and the integrated dynamics model of the flexible appendage relative to the central rigid body of the flexible satellite; describing the constraint pf the flexible appendage relative to the rotation of the central rigid body of the flexible satellite. The method has the advantages that the dynamics double-coupling relation of the flexible satellite is described compactly, calculation efficiency is increased, programming can be achieved easily, subsequent controller design is facilitated, and control precision is increased.

The invention discloses a coordinate-based SVPWM (Space Vector Pulse Width Modulation) method, which comprises the following steps of: (1) obtaining a target voltage vector in a dq rotating coordinate system according to a corresponding system structure, performing per unit processing, converting the target voltage vector to an alpha beta static coordinate system, and selecting two basic vectors according to a cost function; (2) the duty ratio is solved by using coordinates according to the geometrical relationship of the three; and (3) modulating and outputting an SVPWM signal according to the duty ratio and the basic vector state quantity. According to the method, a target vector is converted to a static coordinate system, a cost function is constructed, a basic vector required by synthesis of the target vector is selected through the cost function, and then a duty ratio required by synthesis is solved by converting a geometrical relationship of the vectors into an algebraic relationship between coordinates. And finally, the SVPWM signal is output by matching the on-off state corresponding to the basic vector with the duty ratio, so that the processes of sector judgment, vector decomposition, duty ratio sub-sector calculation and the like are omitted, the SVPWM modulation process is simplified, and the SVPWM modulation process is easier to realize in a programmed manner.

The invention discloses a small signal stability analysis method for a medium-voltage direct-current system based on a discrete state space, and belongs to the field of electrical engineering. The method comprises the following steps: deducing and establishing discrete state space models and discrete equivalent circuit models of direct current network elements and alternating current equipment elements in a system; constructing a discrete state space model and a discrete circuit network of the whole system according to the discrete equivalent circuit of each element and the topological structure of the system, and eliminating an intermediate variable of a state space equation based on the discrete circuit network to obtain a discrete state matrix; and according to the discrete state matrix of the system, solving a full-dimensional discrete characteristic value of the medium-voltage direct-current power system so as to analyze the small signal stability of the system. The method is clear in physical significance, programming is easy to achieve, compared with a traditional continuous state space analysis method, the topological structure of the system can be reserved, a calculation program is easy to modify when the topological structure of the system is changed, and the method is quite suitable for the medium-voltage direct-current power system with high reconfigurability.