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196 results about "Load cycle" patented technology

Crack propagation rate measurement method

The invention discloses a crack propagation rate measurement method. The method comprises the steps of applying alternating load to a test piece with a single-side penetrated crack by a testing machine; measuring load-displacement curves at an interval of certain loading cycles and fitting a linear segment to obtain the non-dimensional flexibility value of the test piece; acquiring the length of the crack according to the relation of the non-dimensional flexibility value of the single-side penetrated crack and the length of the crack under a clamped boundary condition; recording the number of the current loading cycles to obtain a crack length-load cycle number curve, and determining the crack propagation rate; and calculating the corresponding stress intensity factor, acquiring discrete data and fitting to obtain the parameters of the crack propagation rate. The method has the advantages that the method is suitable for measuring the crack propagation rate under positive and negative stress ratios and can be used for measuring the crack length automatically; and the measurement system has wide application range and is particularly suitable for measuring the crack propagation rate of novel materials such as a metal laminated board, a metal/composite material laminated board, a ceramic matrix composite material, a welding material.
Owner:BEIHANG UNIV +1

Asynchronous motor fault monitoring and diagnosing method based on deep learning

The invention discloses an asynchronous motor fault monitoring and diagnosing method based on deep learning. The asynchronous motor fault monitoring and diagnosing method comprises the following stepsthat electric power load time series of an asynchronous motor in known working condition types are acquired, the time span is Num1 electric power load cycles, and electric power load data at each sample time includes data of three dimensions of voltage, current and power; the voltage data, the current data and the power data are separately used as the gray value of pixel points of three layers inRGB images, and the time series of the electric power load cycles are transformed into the RGB image in a segmented mode, and each electric power load time series correspondingly obtains a set of feature image time series; and a deep neural network is trained by the feature image time series of the asynchronous motor and the corresponding working condition types, and a fault diagnosis model is obtained and then used for classifying the working conditions of the asynchronous motor to be tested. The fault diagnostic accuracy of the asynchronous motor fault monitoring and diagnosing method is high, and the threshold of employees is reduced while saving the time of system development.
Owner:CENT SOUTH UNIV

Cloud computing system load predicting method capable of automatically adjusting parameters

The invention discloses a cloud computing system load predicting method capable of automatically adjusting parameters, which comprises the following steps: at the moment t, computing the actual load O(t) of a system at the moment t through system call; executing short-term prediction; computing alpha (t) and E(t) by utilizing the O(t) value and historical data; executing long-term prediction; computing alpha T(t) and ET(t) by utilizing the O(t) and the historical data; combining the short-term prediction and the long-term prediction; when t is less than T, outputting the O(t) and switching to the next step; otherwise, taking the maximum value or average value of E(t-1) and ET(t-T) as the output at the moment t; and updating the historical data, waiting the moment t+1 and switching to the first step. In the invention, the alpha (t) and the alpha T(t) are computed in real time through error functions, thereby enhancing the prediction accuracy of classic EWMA (Exponentially Weighted Moving Average); the requirement that a prediction value is slightly larger than an actual value can be met by expanding the alpha (t) and the alpha T(t) to an interval (-1, 1); and the responsiveness of the prediction to the load periodicity of a cloud computing platform is enhanced by introducing a long-term prediction module.
Owner:PEKING UNIV

Modeling method of ash content accumulation model of diesel particulate filter

ActiveCN108798833AReduce the chance of overloadingDanger of damageInternal combustion piston enginesExhaust apparatusModel methodLoad cycle
The invention discloses a modeling method of an ash content accumulation model of a diesel particulate filter. The modeling method comprises the steps that step 1, the status of an engine is checked;step 2, the diesel particulate filter is weighed initially; step 3, ash content is subjected to loading cycle; step 4, a regeneration mode is entered; step 5, a reference point is tested, the accumulation cycle of the ash content is completed, the next accumulation cycle of the ash content is carried out; step 6, the number times of the accumulation cycle of the ash content is confirmed; step 7, the diesel particulate filter is weighed, engine oil is replaced, and data are recorded; step 8, the running time of the engine is confirmed; and step 9, modeling is carried out for analyzing the corresponding numerical relationship between ash content accumulation and fuel consumption. According to the modeling method of the ash content accumulation model of the diesel particulate filter, the relationship between the ash content accumulation rate and fuel oil consumption and engine oil consumption can be established accurately, and the control accuracy and effectiveness of an ECU for the regeneration process of the diesel particulate filter can be ensured.
Owner:SAIC MOTOR

PEA space charge measurement system and method under full-size high-voltage direct current cable temperature control gradient

The invention discloses a PEA space charge measurement system under a full-size high-voltage direct current cable temperature control gradient. The system comprises a direct current cable insulation layer temperature gradient control device (2), an electrode system (3), a PEA space charge measurement device (4) and an external measurement control device (6). The direct current cable insulation layer temperature gradient control device is provided with a closed space surrounding a test cable, the electrode system (3) is connected to the test cable inside the closed space and is connected with a high-voltage impulse source (5) outside the closed space through a wire, the PEA space charge measurement device (4) is connected to the electrode system (3), and the external measurement control device (6) is located outside the closed space and is connected with the PEA space charge measurement device (4). The PEA space charge measurement system and method are used for space charge measurement of an insulation layer of a full-size high-voltage direct current cable under the temperature control gradient in the research and development test period, the prequalification test period, the load cycle test period and the long-term aging test period, and the high resolution ratio and measurement precision can be achieved.
Owner:ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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