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226 results about "Pre testing" patented technology

Pre-testing simply means, testing the validity, reliability, practicability and sensitivity of the tool before it is used for actual data collection. The only way to gain assurance that questions are unambiguous is to try them on a selected small group of prospective respondents. Pre-testing can be done in parts.

System for pre-testing and diagnosing electro magnetic interference of electronic equipment and method thereof

The invention discloses a system for pre-testing and diagnosing the electro magnetic interference of electronic equipment, which is characterized by comprising a data collecting module, an interference source diagnosing and locating module, an environmental noise eliminating module and a visual time-frequency analyzer, wherein the data collecting module, the interference source diagnosing and locating module and the environmental noise eliminating module are respectively connected with the visual time-frequency analyzer, and the visual time-frequency analyzer achieves the drive of the data collecting module, the call of the interference source diagnosing and locating module and the environmental noise eliminating module and the monitoring and displaying of time-domain waveforms and frequency spectrums. The invention also discloses a method for pre-testing and diagnosing the electro magnetic interference of electronic equipment, which utilizes a LabView visual instrument platform and Matlab programming environmental developing software to pre-test and diagnose signals. The invention can pre-test and diagnose the electro magnetic interference of electronic equipment at common test fields, and has high automation and carrying degree and simple usage and reduces cost.
Owner:CHINA SHIP DEV & DESIGN CENT

Radio interference exciting functions for conductors of ultrahigh-voltage transmission line and determining method for radio interference exciting functions

InactiveCN102509011ALow costAccurately predict radio interference levelsSpecial data processing applicationsAnalysis methodPre testing
The invention discloses radio interference exciting functions for a 10 split conductor and a 12 split conductor of an ultrahigh-voltage transmission line and a determining method for the radio interference exciting functions. The determining method for the radio interference exciting functions comprises the following steps of: through an ultrahigh-voltage corona cage test, researching corona properties of the 10 split conductor and the 12 split conductor in good weather and on heavily raining days; obtaining the corona properties of various split conductors under the two weather conditions respectively; establishing respective radio interference exciting functions of the various split conductors and altitude revision factors of the radio interference exciting functions by applying a statistic analysis method, a physical method and a mathematic method; and determining the relationship between the exciting functions and conductor structures, and the relationship between the split number and diameters of subconductors and other parameters. Proved by comparing test data, the exciting functions are suitable for characteristics of the transmission line in China and are applicable for pre-testing radio interference of the split conductors of the ultrahigh-voltage transmission line from now on so as to instruct the design of the conductor structures of an ultrahigh-voltage transmission line in the future.
Owner:STATE GRID ELECTRIC POWER RES INST

Visualization quantitative CT (Captive Test) characterization method for component distribution and physical structure of coal sample

InactiveCN102980902AHigh demands for attenuated resolutionIncrease mining rateMaterial analysis by transmitting radiationMathematical modelX-ray
The invention relates a visualization characterization technology of a coal sample, and in particular relates to a visualization quantitative CT (Captive Test) characterization method for component distribution and a physical structure of a coal sample. The visualization quantitative CT characterization method comprises the following steps of: sampling and pre-testing the coal sample; carrying out an X-ray absorption characteristic analysis on each component of a second coal sample; carrying out X-ray absorption characteristic analysis on residual minerals; carrying out a CT on the coal sample; establishing a mathematical model and carrying out a numerical analysis on CT slices; and carrying out visualization quantitative characterization. The CT characterization method provided by the invention adopts a plurality of CT data obtained by monochromatic X-ray experiment energy to carry out conjoint analysis, and detects the information of a component, dimension of which is smaller than CT resolution dimension, on a CT picture by establishing a data model on a single CT element, so that the visualization result of the component distribution characteristic and the physical structure of the coal sample is accurate.
Owner:SHANXI UNIV

Automobile operation stability testing system based on driver model and testing method

The invention provides an automobile operation stability testing system based on a driver model and an automobile operation stability testing method. The driver model comprises a pre-scanning module, a pre-testing module, a comparing module and a control module, wherein the pre-scanning module obtains an anticipating track according to output of a trailing sensor installed on an automobile, the pre-testing module calculates a pre-testing track of automobile running according to output of a sensor inside the automobile, the comparing module enables the anticipating track and the pre-testing track to be compared and outputs deviation, and the control module calculates and outputs changing quantity of steering wheel corners through potential difference (PD) control according to the deviation. The anticipating track is a snakelike path on an automobile running path, the automobile runs around stakes along the snakelike path at setting speed, the testing system and the testing method calculate final steering wheel corners and output to the automobile to control the automobile to track the anticipating track to run according to the steering wheel corners obtained from automobile status information and the changing quantity of the steering wheel corners calculated by the driver model, and therefore, the automobile operation stability is tested.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
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