137results about How to "The evaluation method is simple" patented technology

The invention discloses a method and a device for evaluating the voice quality of a voice over Internet protocol (VOIP). The method comprises the following steps of: monitoring and capturing a data packet in real time; judging whether the monitored and captured data packet is a preset data packet of a VOIP client or not, and arranging the monitored and captured data packet into a data packet queue if the monitored and captured data packet is the preset data packet of the VOIP client; performing voice stream processing on the data packet arranged into the data packet queue, and acquiring a voice data packet; and performing voice quality evaluation coefficient calculation according to the acquired voice data packet, and evaluating the voice quality. By the method and the device, voice quality evaluation reliability can be improved.

The invention relates to a beam bridge state evaluation method, which comprises the following steps of: 1) installing an FBG (fiber bragg grating) sensor on a beam bridge to be detected; 2) carrying out a quasi static load experiment on the beam bridge to be detected to obtain a control point deflection value; 3) comparing the control point deflection value obtained in the step 2 with a control point deflection value obtained by a finite element calculation model to obtain a beam bridge correction coefficient h; and 4) judging the working situation of the bridge structure according to the beam bridge correction coefficient h calculated in the step 3. The elevation method disclosed by the invention is convenient and practical; light load is used for replacing heavy load to lower the experiment expenditure; traffic interruption time is reduced; quasi static load or dynamic load is used for replacing static load; the analytical algorithm of the load experiment result can be directly obtained from a quasi static load experiment result so as to greatly lower the later-stage analysis difficulty of the quasi static load experiment data; and a quick load experiment method is used for replacing the traditional load experiment method.

The invention relates to a transient voltage stable on-line assessment method based on a WAMS (Wide Area Measurement System) and an EMS, comprising: obtaining WAMS real-time power grid measurement information to determine whether a power grid is disturbed; obtaining the topological structure, parameters and power flow operation information of a current power grid from an EMS when the power grid is disturbed so as to calculate a full admittance matrix concerning load equivalent admittance; according to the WAMS measurement information, running statistics on nodes having a voltage dip exceeding a preset threshold value, obtaining Thevenin equivalent parameters of statistic nodes based on full admittance matrix inversion to be used as an initial value to track Thevenin equivalent parameter identification of the WAMS measurement information and static state voltage stable margin index calculation, and calculating a transient voltage dip acceptability area index; and running statistics on nodes having a power grid node voltage dip exceeding a preset threshold value and having a dip duration greater than a preset threshold value, and determining the occupancy of power grid disturbance transient voltage instability nodes. The method can rapidly and effectively realize the stable and rapid assessment of a transient voltage.

The present invention provides a lithium ion battery cycle life detection device and a lithium ion battery cycle life assessment method. The lithium ion battery cycle life detection device comprises two bottom plates and pressure sensors, the two bottom plates are arranged parallelly, and a to-be-detected lithium ion battery is located between the two bottom plates. The pressure sensors are respectively installed on the opposite side surfaces of the bottom plates and the to-be-detected lithium ion battery, and the output ends of the pressure sensors are connected with a signal processor electrically. According to the above lithium ion battery cycle life detection device, the pressure sensors are arranged on the bottom plates, when the charge and discharge cycle tests are carried out on thelithium ion battery, the lithium ion battery expands in the thickness direction, the pressure sensors can reflect the pressure change caused by the lithium ion battery thickness change to the signalprocessor timely, and by a relation schema of the cycle number of times and the capacity attenuation rate and the pressure change, the cycle life of the lithium ion battery can be assessed. The abovedetection results are more accurate, and the assessment method is simpler and is stronger in adaptability.

The invention belongs to the technical field of design of airborne hydraulic systems and relates to a real-time simulation system of a large aircraft hydraulic system. The real-time simulation system of the large aircraft hydraulic system comprises a human-computer interface interaction subsystem and a real-time calculating subsystem which are connected through the real-time Ethernet. The real-time simulation system of the large aircraft hydraulic system is based on the advanced design ideas such as distributed type parallel simulation and system integrated modeling, rapidly achieves rapid prototyping of a control system, aims to build a multi-system integrated digital model, tries to comprehensively reflect the complex integration and coupling among multidisciplinary subsystems such as a mechanical subsystem, a hydraulic subsystem, an electrical subsystem, an electronic subsystem and a control subsystem, and sees through and obtains more qualities of the large aircraft hydraulic system clearly.

The invention provides an arteriosclerosis degree evaluating method and device and an arteriosclerosis detector, and relates to the technical field of arteriosclerosis detection. The arteriosclerosisdegree evaluating method includes the steps of collecting PPG signals of at least two body parts of a target object and detecting characteristic points of the PPG signals; according to the characteristic points of all the PPG signals, determining the pulse wave conduction velocity of the target object; on the basis of preliminarily established corresponding relations between pulse wave conductionvelocities and ages, evaluating the arteriosclerosis degree of the target object. According to the arteriosclerosis degree evaluating method and device and the arteriosclerosis detector, the arteriosclerosis degree evaluating mode is more convenient and feasible.

The invention discloses a method for assessing a geomagnetic field space prolongation algorithm. The method comprises a step of establishing an assessing standard of single assessment indicators of the geomagnetic field space prolongation algorithm, wherein the single assessment indicators comprise prolongation precision, prolongation distance, prolongation area, noise effect and prolongation calculating time, the relative error of mean square of the prolongation result of the geomagnetic field space prolongation algorithm to theory data is used as the standard of the prolongation precision, a step of establishing comprehensive assessment standards including all single assessment indicators, a step of calculating a comprehensive score according to the prolongation result of the geomagnetic field space prolongation algorithm, and rating the geomagnetic field space prolongation algorithm. The method can provide a quantitative evaluation basis for the geomagnetic field space prolongation algorithm, can also provide a basis for how to select the prolongation algorithm and how to judge whether the selected prolongation algorithm conforms to application requirements or not, and can carry out quantitative evaluation on the adaptability of the geomagnetic field space prolongation algorithm. The method for assessing the geomagnetic field space prolongation algorithm is simple.

The invention discloses a logarithmic derivative analysis method based insulation aging state evaluation method of an XLPE cable. The XLPE cable is sliced in an insulated manner to prepare different objective samples, electrodes are prepared from the objective samples, the objective samples are then placed in a dielectric spectrum tester to obtain a dielectric constant real part epsilon' and a dielectric constant imaginary part epsilon''; and a curve that the dielectric constant real part epsilon' and the dielectric constant imaginary part epsilon'' change with the frequency is obtained, mathematical calculation is carried out on the dielectric constant real part epsilon' to obtain change of a first-order derivative of the logarithm of the diagonal frequency omega of the dielectric constant real part epsilon' with the frequency, and the insulated aging state of the XLPE cable is represented. According to the method, influence of DC in the low-frequency range on the dielectric relaxation process is avoided effectively, compared with traditional dielectric constant real and imaginary pars, the change rule is more obvious, the aging state is indicated more clearly, the method is simple in operation, and an evaluation result is accurate.

The invention relates to a test and evaluation method for an abnormal sound performance of an automobile. The method is characterized by comprising the following steps that 1) a test is arranged in the vehicle; 3) the automobile is driven in test conditions, a sensor collects and records noise data in the different conditions; and 3) the collected noise data is analyzed in an ISO532 B method, a loudness graph is drafted, and loudness values are read. Via the method, objective test data of the abnormal sound performance can be obtained directly and rapidly, whether the automobile has a problemof abnormal sound is determined rapidly and accurately, and sound pressure level and loudness of the abnormal sound in a test result needs to be analyzed. The method is simple, efficient and low-cost,expensive testers and tools are not needed, the method is not limited by automobile models, and the simple, practical and economic test and evaluation method is provided for development and optimization in the field of abnormal sound performance of the automobile.

The invention discloses a synthetic aperture radar (SAR) image quality evaluation method based on contrast sensitivity characteristics. The method can effectively eliminate noise interference of a high frequency part in an SAR image by utilizing similarity of wavelet decomposition and contrast sensitivity colony stimulating factor (CSF) function space frequency band pass. Simultaneously, the method is simple, convenient and accurate to calculate, free from referring the SAR image and capable of evaluating the image quality comprehensively and effectively only according to an HVSR parameter index. The method can be applied to the SAR image obtained by airborne or satellite borne synthetic aperture radar. A subjective no-reference image type SAR image quality evaluation model is established through the multichannel characteristics of contrast sensitivity in human eye vision and by combining a method of wavelet transform in image processing, and evaluation of the SAR image by real subjectivity is achieved. According to the SAR image quality evaluation method based on the contrast sensitivity characteristics, the defect that existing SAR image quality evaluation lacks subjective characteristics is remedied, and solid technical support for evaluating the SAR image and improving the SAR image quality in future is established.

The invention discloses a method for determining the flatness ratio of a shallow and long-span city tunnel. The method includes the following steps that geological conditions of a stratum of a project are hierarchically generalized according to engineering geological investigation results; a grid model is built through numerical analysis software to simulate the tunnel construction process under the flatness ratio condition, and mechanical responses of the stratum and a supporting structure are solved; according to the requirements for the building safety and the building economical efficiency of the shallow and long-span city tunnel and environment influence control over the shallow and long-span city tunnel, an optimized objective function is proposed, and a result is simulated according to numerical values. The calculation flow of the analytic hierarchy process mainly includes the steps of building a hierarchical structure model; building a pairwise comparison judgment matrix; carrying out single hierarchical arrangement and a consistency check of the single hierarchical arrangement; carrying out comprehensive hierarchical arrangement and a consistency check of the comprehensive hierarchical arrangement. Parameter influence factors under different flatness ratios are analyzed with the analytic hierarchy process, weight comparison and calculation among multiple parameters are achieved, and a simple and convenient evaluation method is provided for multi-target or multi-criteria or structural-characteristic-free complex decision making problems.

The invention belongs to the field of chemical process risk assessment, and relates to a method for evaluating the thermal runaway risk degree of the chemical process. The method comprises the following steps: 1) collecting thermal risk data of raw materials, products and reaction processes; 2) determining a substance coefficient MF, wherein the substance coefficient MF is determined by the initial decomposition temperature Tonset and the maximum exothermic power MPD of the substance; 3) determining a reaction thermal runaway risk index RI, wherein RI is the product of the consequence severityS and the possibility P of the runaway reaction; and 4) calculating a thermal runaway risk index ITHI of the technological process, and determining a thermal runaway risk grade of the technological process according to an ITHI thermal runaway risk grading standard. Substance thermal risks and reaction runaway risks are combined. A quantitative evaluation method for the thermal runaway risk of thechemical technological process is provided.

The invention discloses an unmanned aerial vehicle deployment method in an unmanned aerial vehicle assisted cellular network, and belongs to the technical field of wireless communication. The method comprises the steps of: enabling a base station to collect information according to different information sources, and establishing a probabilistic sight distance transmission model according to the collected information; secondly, selecting unmanned aerial vehicle deployment scheme parameters and user classification; thirdly, based on the model and the proposed unmanned aerial vehicle deployment and user access method, selecting a key performance index according to a specific scene and demand; evaluating the selected key performance indexes of the three types of users by adopting an analysis method of a random geometry theory in a given group of parameter settings; after multiple sets of parameter settings are evaluated, searching the size of the optimal repulsion area and the optimal unmanned aerial vehicle height; and finally, implementing an unmanned aerial vehicle deployment scheme. The interference suppression and evaluation method provided by the invention has the advantages of simplicity, quickness and universality, can remarkably reduce signaling overhead and system complexity, is transparent for users, does not need the users to carry out additional measurement and report, and reduces the burden of the users.

The invention discloses a pulse Doppler radar amplitude jitter estimation method. The method comprises the steps that echo signal data of a stationary object or processed echo signal data are collected; windowing and Fourier transform in direction are carried out on the data to acquire a frequency-domain data matrix; modular operation is carried out on the frequency-domain data, and Doppler filtering is carried out on the frequency-domain data matrix after modular operation, so as to acquire a Doppler spectrum; the ratio of the zero-Doppler frequency amplitude to the maximum non-zero Doppler frequency amplitude is acquired; and jitter amplitude is evaluated according to the ratio. According to the invention, the residual clutter intensity of a strong stationary target signal during Doppler processing can be evaluated, and the ability of jiggle target detection of a radar system is evaluated.

The invention relates to a holographic-display-oriented multichannel man-machine interaction work efficiency evaluation system and evaluation method. The system is composed of a holographic projection system, a multichannel interaction system, and a physiological signal acquisition and processing system. The holographic projection system includes a projector and a 180-degree holographic cabinet; the projector is arranged in front of the 180-degree holographic cabinet directly and is used for irradiating the 180-degree holographic cabinet. According to the invention, the system has high extensibility and can be provided with other input devices to complete testing and evaluation various interaction work efficiencies under holographic display; and for example, the system can be applied to multichannel multi-interaction work efficiency researches in environments like an aviation cockpit or a car cabin. In addition, the provided evaluation method is simple and can be implemented conveniently and rapidly; interaction can be carried out by selecting a multi-channel condition or a mouse interaction condition correspondingly according to an evaluation result, thereby reducing unnecessary fatigue on cognition of an interactive user. Therefore, the method and system have the great practical application significance.

The invention discloses a residential indoor gas explosion risk assessment method and a device. The method comprises the steps of obtaining a risk value S of an indoor gas system defect; obtaining a personnel safety consciousness influence value E; obtaining a vulnerability analysis value B of the disaster-affected body; obtaining a control force coefficient K; acquiring an emergency rescue compensation factor gamma; acquiring an accumulated hidden danger correction factor tau; obtaining a quarter correction factor mu; establishing a residential indoor gas explosion risk calculation model, andcalculating a residential indoor gas explosion risk value by using the residential indoor gas explosion risk calculation model; risk grading is carried out through a formula, Rmax is the maximum value of the gas explosion risk value in the resident house, and Rmin is the minimum value of the gas explosion risk value in the resident house; the method has the advantages that the method is simple and effective, and can be quickly applied to gas explosion risk assessment in residential households.

The invention discloses a photoelectric conversion module relative intensity noise (RIN) test device and test method, comprising employing an electric signal supply module to supply high speed signals for a photoelectric conversion module to be detected; utilizing a reflection module to form reflected light to interfere the photoelectric conversion module to be detected; utilizing an optical power calculation and display module to control reflected light signal attenuation according to the power difference standard between the emission light and the reflected light of the photoelectric conversion module to be detected; providing required reflection interference light signals for the photoelectric conversion module to be detected; utilizing an optical eye pattern display module to display the emission light eye pattern of the photoelectric conversion module after reflected light interference; and selecting a worst value among the jitter values of the eye patterns in the eye pattern display module as a sampling eye pattern to calculate an RIN index. The test device and test method solve the problems of inconvenient wiring and complex data analysis of a current photoelectric conversion module RIN test method, thereby conveniently and visually obtaining the RIN index of the photoelectric conversion module to be detected.

The invention discloses an intelligent evaluation method of lines of credit. The method comprises steps of S1, using the occurrence probability that a user normally fulfils the agreement as an initialcredit scoring value, and using user credit data to train the model of the probability so as to obtain an initial credit scoring model; S2, acquiring credit data of a to-be-evaluated user, and usingthe initial credit scoring model to score the acquired credit data so as to obtain an initial credit scoring value; and S3, inputting the initial credit scoring value into a probability distribution relation between a credit scoring value and a line of credit value constructed according to the probability distribution features in advance, and calculating to obtain the line of credit value of the to-be-evaluated user. According to the invention, the method is advantaged by simple achieving method, capability of achieving intelligent evaluation of the lines of credit, high evaluation efficiencyand precision and flexible application.

The invention discloses a comprehensive evaluation method of erosion condition of an electric transmission and transformation equipment earthing material. According to the comprehensive evaluation method, when the pH value of soil in which an earthing device is buried is less than 6.8, the erosion degree of an earthing material is large; when the pH value of soil in which the earthing device is buried is greater than or equal to 6.8 and the moisture content of soil in which the earthing device is buried is greater than or equal to 35%, the erosion degree of the earthing material is small; and when the pH value of soil in which the earthing device is buried is greater than or equal to 6.8 and the moisture content of soil in which the earthing device is buried is less than 35%, and soil resistivity, reduction-oxidation potential, material corrosion potential, chloride ion content and sulfate radical content of soil in which earthing materials is buried are researched. The evaluation method provided by the invention is an on-site testing method of erosion resistance of an earthing material, a test person can know the corrosion condition of the earthing material in a short time when the test person carries a simple analytical apparatus, the evaluation method is simple and practical, and the test result is exact.