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Failure diagnosis and health evaluation method based on wavelet power, manifold dimension reduction and dynamic time warping

The invention discloses a failure diagnosis and health evaluation method based on wavelet power, manifold dimension reduction and dynamic time warping, and aims to improve the feature separability of bearing failure, impeller failure and the mixed failures of a centrifugal pump and realize diagnosis and health evaluation of various states. The method comprises the following steps: firstly, decomposing collected vibration signals of the centrifugal pump into 8 wavelet components by applying wavelet packet conversion; extracting wavelet energy of each component to be taken as a failure feature to obtain an eight-dimensional failure feature vector; then conducting dimension reduction on the eight-dimensional feature by applying a manifold learning method to obtain a three-dimensional feature vector with better separability, simplicity and stability; finally, based on the feature vector, measuring the distance of test data and training data by applying a dynamic time normalization method so as to determine the current failure state and realize failure diagnosis of a bearing. The distance value can also reflect the health degree of the current state, can realize evaluation of the health state of the centrifugal pump, and has the excellent practical engineering application value.
Owner:BEIHANG UNIV

Organic semiconductor structure, manufacturing method of the same, and organic semiconductor device

A manufacturing method of an organic semiconductor device wherein an organic semiconductor layer being, a structural component of an organic semiconductor device is formed continuously with uniform performance over a sufficiently large area. The organic semiconductor structure comprises an organic semiconductor layer formed from an organic semiconductor material having a liquid crystal molecule in at least one part, the liquid crystalline organic semiconductor material exhibits a supercooled state during a phase transition process, the phase of the material is transferred from the supercooled state to the phase having periodic regularity at a location of a center of gravity in between the liquid crystal molecules; in a temperature raising process from the phase having no periodic regularity a center of gravity in between the liquid crystal molecules, the liquid crystalline organic semiconductor material exhibiting the phase having no periodic regularity with of a center of gravity in between the liquid crystal molecules is supercooled, to a temperature lower than a temperature of which the phase is transferred to the phase having periodic regularity at a location with a center of gravity in between the liquid crystal molecules, and after the phase transition to the phase having periodic regularity at a location of a center of gravity in between the liquid crystal molecules is started, the material is turned into a state that the converted to a phase having periodic regularity at a location of with a center of gravity between the liquid crystal molecules being thermodynamically stable phase and the phase having no periodic regularity at a location of a center of gravity in between the liquid crystal molecules is a thermodynamically metastable phase, and the organic semiconductor layer being formed by maintaining said state until the liquid crystalline organic semiconductor material is turned into a converted to a state exhibiting the phase having periodic regularity at a location of a center of gravity in between the liquid crystal molecules.
Owner:DAI NIPPON PRINTING CO LTD
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