123 results about "Real variable" patented technology

The invention discloses a fault diagnosis method during the industrial process. The method comprises the steps of collecting historical normal data during the industrial process; calculating a detection statistics based on the historical normal data during the industrial process; collecting the to-be-detected data of the industrial process; on the condition that the industrial process is detected to be out of order, extracting a statistic feature based on the relative refactoring contribution method; according to the statistic feature, calculating a conditional probability density function in the fault mode and a conditional probability density function in the normal mode; according to the prior probability and the conditional probability density function, calculating a posterior probability; conducting the fault variable recognition on a current time sample based on the minimum risk Bayesian decision theory; according to a diagnosis result, updating the prior probability for the next time sample and conducting the fault diagnosis and recognition again for the next round. According to the technical scheme of the invention, the major failure variable, the secondary process variable and the normal variable of the current sample are distinguished. Meanwhile, the diagnosis result of the process variable of the previous time sample is applied to the diagnosis of the current sample. Therefore, the pollution effect during the fault diagnosis of the industrial process is eliminated.

Problem: A method capable of ensuring a synchronization between an audio signal and a video signal both of which are modified in time-scale is needed. Solution: When analysis shift Sa=Ss/α, where Ss is synthesis shift and α is a designated time-scale (variable speed ratio), has a decimal value, two natural numbers which are nearest to the decimal value are selected as a modified analysis shift Sa′ and a compensated analysis shift Sa″, respectively. In time-scale modification of source audio samples to vary playback speed by dividing them into overlapped successive analysis windows, the modified analysis shift Sa′ and the compensated analysis shift Sa″ are alternately applied whenever a predetermined condition is met. The time difference between an estimated playback time and a real playback time of the time-scale modified audio signal is accumulated. The case that the predetermined condition is met is a case than an accumulated time difference goes beyond an upper threshold or a lower threshold of an allowed error range. In a processing of varying the playback speed of an AV signal, if a real variable speed ratio of a playback-speed-varied video signal is given as a target variable speed ratio of an audio signal to vary the playback speed of the audio signal, a synchronization between the video signal and the audio signal can be obtained. By applying this technology to the digital TV or TV phone, consecutive watch of the broadcasting signal for a phone-break time is possible. Catch-up for the currently received broadcasting signal is also possible through a high speed playback mode after a low speed playback mode initiated from a time of the past or the present.

The invention relates to a design method for end part- and root-reinforced few-leaf variable-section steel plate springs, and belongs to the technical field of suspension steel plate springs. The design method disclosed by the invention comprises the following steps: determining the toot thickness he of an equivalent single leaf according to the structure of each steel plate spring, a design rigidity, the thickness ratio of oblique line segments on the root and the end parts, and the thickness ratio of primarily-selected parabolic segments, and determining the maximum allowable thickness [h2] of the root according to an allowable pressure at first; then designing the number N and the root thickness h2 of the few-leaf variable-section steel plate springs according to he and [h2]; and then designing the thicknesses and the lengths of straight segments on the end parts of each leaf separately according to the end part thickness beta he of the equivalent single leaf. Through ANSYS simulation and verification, the accurate parameter design values of the end part- and root-reinforced few-leaf variable-section steel plate springs can be obtained by virtue of the method, the design level and the performance of products are improved, the weights of the springs are reduced, and the running smoothness of vehicles are improved; and meanwhile, the design and test expenses are reduced, and the development speed of the products is increased.

The invention relates to a traffic sign identification method and a device thereof. The traffic sign identification method adopts relative variables of three components in an RGB space as new variables for dividing a color region; the new relation of corresponding variables in the RGB and the HIS spaces is obtained by the variables and the expression of color tone in the transformation formula of the universal RGB-HIS spaces, and a first threshold value scope in the color region is divided according to a color tone variable H in the HSI space; and a second threshold value scope of the relative variables in the corresponding RGB space is obtained, thereby abstracting the color of an image to achieve to obtain the interested region of the traffic sign according to the value of the relative variables obtained from the image. The traffic sign identification method and the device thereof have good real time, as well as higher identification efficient and accuracy.

The invention relates to the field of air conditioners, in particular to a control method of a multi-machine-head variable-frequency centrifugal central air conditioning unit. The method includes the following steps that target temperature is set when freezing water flows out; refrigerating total amount is acquired; initial water inflow temperature is acquired; a compressor with the largest refrigerating amount in the central air conditioning unit is started, the difference between the initial water inflow temperature and current water inflow temperature is recorded, the difference between the initial water inflow temperature and the target temperature is recorded, and refrigerating demand amount of a whole system is made; remaining load is calculated, and when the remaining load is larger than the refrigerating amount of a remaining compressor in the optimal energy efficiency state, the second largest compressor is started so that the compressor can run in the optimal energy efficiency; when the remaining load is smaller than the refrigerating amount of the remaining compressor in the optimal energy efficiency state, a compressor with the refrigerating amount close to that of the remaining compressor is started, so that the remaining compressor achieves the optimal energy efficiency state sequentially; water outflow temperature of the freezing water is detected and compared with the target temperature; whether the air conditioner meets the machine stop condition is judged.

The invention discloses a multi-scale variable-step autofocusing searching method. Searching range and searching step length are gradually reduced through multiple times of searching, and the peak of a curve is determined through curve fitting rather than the maximum value of a sharpness evaluation value so that the searched focusing position is enabled to be close to the real focusing point as far as possible; two successive times of searching positions are compared by adopting threshold setting, and completion of searching steps is determined; and the searching position of the maximum value of the evaluation value of each time of searching acts as the center point of the next searching interval to take symmetric intervals for searching in the process of multi-scale searching so that real focusing point is ensured to be included in the interval. According to the method, interference of the local peak value can be effectively eliminated, and optimal searching can be realized, focusing efficiency is high and focusing is accurate.

The invention relates to a system integration device and a system integration method of test parameters based on the unit combination. The device comprises a main control computer and an exchange board, and also comprises a switch unit, a lower variable-frequency generation unit, a digitalized instrument generation unit, a base band signal generation unit and an upper variable-frequency generation unit, which are connected and communicated with one another; the lower variable-frequency generation unit is matched with the digitalized instrument generation unit and used for receiving and testing a test signal; and the base band signal generation unit is matched with the upper variable-frequency generation unit and used for generating and transmitting an excitation signal. By adopting the scheme, a test system with high performance and low cost is easy to establish, and different instrument functions can be realized by maximally utilizing fewest standard universal units.

The invention relates to the field of calibration methods of measuring equipment, aims at solving the technique problem and overcoming the disadvantage that existing water content calibrating methods are not applicable in the processing technic of cigarette grouping, and provides a method that can quickly and accurately calibrate water content gauges in the working process. The improved calibration method of the invention adds a Beta variable, and consequently builds the connection between mutually independent calibration curves, can finish the revision of all curves in daily dynamic calibration only by adjusting the Beta variable, greatly lowers the sample amount in the sampling, raises calibration efficiency and precision and realizes the real-time calibration of linear water content gauges in the processing technic of grouping.

A method of simulating a borehole acoustic response in an anisotropic formation of the crust of the earth, the method comprising: formulating a geometric model of the formation, the geometric model comprising a plurality of layers definable in a cylindrical coordinate system defined by an axial direction normal to each of the layers, a radial direction relative to the axial direction, and a circumferential direction relative to the axial direction; formulating a computational model of wave propagation in the formation, the computational model comprising one or more field variables and a wave equation describing a behaviour of the one or more field variables, wherein the one or more field variables are represented as respective Fourier series expansions of π-periodic harmonics in the circumferential direction, and numerically solving the computational model.

A system includes a variable determination module determining a variable operable to be used for the final model and also determining a modification to the at least one variable. An assumption determination module determines an assumption operable to be used for the final model. The assumption includes a transformation for the variable describing how the variable impacts the marketing objective or how the variable impacts another variable operable to be used in the final model. The assumption module also determines a modification to the assumption. A model generator generates a candidate model using the variable and the assumption, and generates a new candidate model using the modified assumption, the new variable or the modification to the variable. The candidate model or the new candidate model is operable to be selected as the final model based on at least one of a statistical measure and an indication of relevance for the variable in the candidate model and the new candidate model.

A detection and predetermination calculational method for rapid variation light power comprises steps of: respectively obtaining characteristic parameters and a threshold value of an instant slope ratio of all gears of a TIA circuit which are stored in a parameter table; calculating the instant slope ratio value of output signals of the TIA circuit in real time, and comparing the real time instant slope ratio value and the threshold value of instant slope ratio; when input light signal varies quickly, determining the beginning power value of input light variation, and calculating the real variable quantity of the input light power according to the instant slope ratio of the output signals of the TIA circuit; adding the beginning light power of input light variation and input light power variable quantity obtained by predetermination calculation to obtain determination light power when input light rapid varies to serve as the real instant power of the input light, comparing the light power value obtained by predetermination and the light power value obtained according to the output signals of the TIA circuit, finishing the predetermination calculation when the predetermined light power value and the light power value are closer, using the light power value as the real instant power of the input light. The method greatly speeds up light power detection speed and can accurately display the light power value of fast variation.

The invention provides a stepwise multivariable regression model for predicting diseased survival time and application thereof. Whether to introduce a new variable or delete an original variable is judged by constructing an F statistic in the stepwise multivariable regression model, and after introduction of each new variable, whether to delete one variable is judged, that is, whether the newly-introduced variable is associated with the original variable is verified; when the fitting coefficient is greater than 0.8, the fitting effect is relatively good. The stepwise multivariable regression model has relatively wide application to prediction of the survival time of patients suffering from cancers and serious diseases similar to the cancers.

The invention relates to a double-field variable-focus three-dimensional measurement system. The system comprises a primary-secondary mirror imaging measuring system, a two-dimensional tracking rotating-mirror device and an adaptive control system. The primary-secondary mirror imaging measuring system is composed of a telephoto subsystem, a short-focus subsystem and a launching light source. The telephoto is composed of a main lens, a first spectroscope, a second spectroscope and a detector. The short-focus system is composed of the main lens, the first spectroscope, the second spectroscope and the detector. The two-dimensional tracking rotating-mirror device is composed of a reflector, a electric rotating motor, a regulating handle, an upper half shaft, a lower half shaft and a horizontal shaft. The adaptive control system is composed of a computer, an input and output (I/O) control circuit, an electromotor and a signal processing and controlling circuit. The system has the advantages of being tight in arrangement, high in measuring efficiency, convenient to measure and is suitable for the three-dimensional measuring of moving and static objects.

A monitor system is formed with a programmable controller for executing a user program, a data collecting unit connected to the programmable controller for collecting variable data of the programmable controller and a monitor device connected to the data collecting unit through a communication line. The functions of the system include that of storing a preliminarily defined virtual variable apart from the user program of the programmable controller and from the variable data of the programmable controller and a calculation formula using one or more real variables for obtaining the virtual variable, that of collecting real variable data in the stored calculation formula and any other real variables from the programmable controller, that of carrying out a calculation according to the stored calculation formula based on the collected real variable data, and that of displaying correspondence of the collected real variables and the result of the calculation as waveforms on a display device. Some of these functions are carried out by the data collecting unit, the rest being carried out by the monitor device.

The invention provides a real-time rejecting method for observed experimental data outliers. The method comprises following steps: performing statistics on existing experimental data of a certain variable set X to determine an outlier threshold; performing real-time detection and rejecting on outliers of experimental data according to a given engineering mathematical model according to the outlierthreshold. The invention determines the outlier threshold by counting the historical experimental data of the continuously changing variable to be observed. The dynamic processing mathematical modelis used to dynamically judge the current experimental data observed by the experimental system, and the outliers can be judged and the outliers can be eliminated, which helps to more realistically evaluate, predict or restore the real variable to be observed. The method provided by the invention is not limited by the use conditions and has a wider application range, and provides an effective dynamic processing method for observing outliers in experimental data.

The invention relates to an under-actuated mast crane positioning anti-swing nonlinear control method and belongs to the field of electromechanical system control. The method comprises the following steps of: constructing an energy function according to the kinetic model of a crane and constructing a Lyapunov candidate function by fully using a coupling relation between drivable variables (rotation angle and pitch angle of a boom) and un-drivable variables (radial swing angle and tangential swing angle of a load) so as to design a novel nonlinear controller. In addition, in order to limit the overshoot of the rotation of the boom, an amplitude limiting item is added to the controller to prevent the boom from swinging near a target position. The method can achieve accurate positioning control and rapid anti-swing control.

The invention discloses a cutting tool. The cutting tool comprises a clamping component and a cutting component capable of being installed on the clamping component, wherein the clamping component comprises a clamping handle part and a clamping head part; the cutting component comprises a cutting head part and a cutting tail part; a clamping bulge is arranged on the end surface of the cutting tail part; an external thread is formed on the clamping bulge; a clamping recession is formed in the end surface of the clamping head part; an internal thread matched with the external thread on the clamping bulge is formed on the clamping recession; an external transition surface located between the external crest and the external root of the external thread is formed at the beginning part of the external thread; the external transition surface comprises an external variable-diameter surface and an external equal-diameter surface; the external variable-diameter surface is connected with the external equal-diameter surface and the external crest; and the distance between the external equal-diameter surface and the external crest in the radial direction of the external thread is r, the internal crest of the internal thread has a constant diameter d1, and the external crest has a constant diameter d2, and r is not less than 0.02mm and not greater than 0.45(d1-d2). The cutting tool disclosed by the invention has the advantages of being stable in structure, high in anti-impact capacity, long in service life and the like.