33results about How to "Few measuring points" patented technology

The invention relates to a turbocharger abnormal sound diagnosis method. The method comprises steps of 1) noise vibration analysis; 2) filtering playback, the engine crankshaft rotating speed and theturbocharger rotor rotating speed corresponding to the frequency when abnormal sound occurs in the noise in a vehicle and the turbocharger near-field noise are filtered and separated; 3) excitation source control, the opening and closing time proportion of a turbocharger waste gas bypass valve is controlled by adjusting the duty ratio; 4) subjective evaluation, subjective evaluation is performed on in-vehicle abnormal sounds and turbocharger near-field noise in three states of an original vehicle state, adjustment of the duty ratio of a waste gas bypass valve controller to be zero and fixationof a waste gas bypass valve; 5) confirmation of the source of abnormal noise; and 6) conclusion verification, a pressure stabilizer is arranged at an air outlet of an air compressor of the turbocharger, and the conclusion is verified through objective improvement of abnormal sound quantification. The method is advantaged in that the abnormal sound source is quickly found by controlling possible excitation source state change, and the test period is short.

The invention discloses a WAMS-based single large disturbance online detection method for a power grid, comprising the following steps: step 1), information acquisition; step 2), disturbance detection; step 3), information fusion; step 4), diagnosis and decision-making. The algorithm of the disturbance detection method of the present invention is simple, the detection speed is relatively fast, and the accuracy is relatively high. In particular, the accurate phase angle information provided by the PMU is used to detect whether the disturbance occurs, and it solves whether a single large disturbance occurs. judgment problem. At the same time, because the uploaded information has a certain error probability, combined with the data uploaded by WAMS and SCADA, the data fusion theory is used to verify whether the disturbance really occurs, and it solves the problem of wrong judgment results of large disturbances caused by wrongly uploaded information.

The invention discloses a measuring method of deepwater reservoir vertical direction water temperature distribution. Control spacing of measuring points is obtained according to measuring accuracy of an instrument, from the water depth of 10 meters to 15 meters to the bottom of a reservoir, the points are measured in every 10 meters to 15 meters, temperature gradients of the points are calculated by a method of back inserting, if the temperature gradient of a certain point is larger than 0.05 DEG C / m, the ratio of the absolute value of the difference of the temperature gradient of the certain point and that of an adjacent point to the temperature gradient of the certain point is calculated, if the ratio is larger than 15%, measuring water temperature is increased to a middle point of the certain point and the adjacent point so as to enable the water temperature of all points to satisfy the condition that the absolute value of the temperature gradient of water temperature is not more than 0.05 DEG C / m or the ratio of the absolute value of the difference of the temperature gradient of the certain point and that of the adjacent point to the temperature gradient of the certain point is not more than 15% or the spacing of the measuring points is not more than two times of the control spacing. The temperatures of all points are sequenced according to the water depth, and then the deepwater reservoir vertical direction water temperature distribution can be obtained through spline interpolation.