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State Detection of Bond Wires in IGBT Modules Using Eddy Current Pulsed Thermography
Insulated gate bipolar transistor (IGBT) modules are important safety critical components in electrical power systems. Bond wire lift-off, a plastic deformation between wire bond and adjacent layers
Physical interpretation and separation of eddy current pulsed thermography
Eddy current pulsed thermography (ECPT) applies induction heating and a thermal camera for non-destructive testing and evaluation (NDT&E). Because of the variation in resultant surface heat
Isomap and Deep Belief Network-Based Machine Health Combined Assessment Model
This paper presents a novel combined assessment model (CAM) for machine health assessment, in which 38 original features of the vibration signal were extracted from time domain analysis, frequency
Fault Diagnosis of Wind Turbine Gearbox Based on the Optimized LSTM Neural Network with Cosine Loss
A fault diagnosis method for wind turbine gearboxes based on optimized LSTM neural networks with cosine loss (Cos-LSTM) is proposed, which can be converted from Euclid space to angular space bycosine loss, thus eliminating the effect of signal strength and improving the diagnosis accuracy.
A propagating mode extraction algorithm for microwave waveguide using variational mode decomposition
One microwave propagating mode extraction algorithm is proposed for microwave waveguide using variational mode decomposition (VMD). The reflected signal acquired by the waveguide can be seen as the
Smooth Nonnegative Matrix Factorization for Defect Detection Using Microwave Nondestructive Testing and Evaluation
A spatial-frequency feature extraction algorithm for defect detection with an open-ended waveguide system using smooth Itakura-Saito nonnegative matrix factorization is developed, which is scale-invariant and imposes smoothness constraint on the solution to enhance the spatial resolution of defect detection.
High‐order partial differential equation de‐noising method for vibration signal
A novel approach for 1D vibration signal de‐noising filter using partial differential equation (PDE) is presented. In particular, the numerical solution of higher‐order PDE is generated, and we show
A Coarse-to-Fine Method for Estimating the Axis Pose Based on 3D Point Clouds in Robotic Cylindrical Shaft-in-Hole Assembly
A novel coarse-to-fine method for object pose estimation coupled with admittance control to promote robotic shaft-in-hole assembly that can locate the target hole in both position and orientation and enable the shaft to move into the hole along the axis orientation.
Eddy current pulsed thermography for fatigue evaluation of gear
The pulsed eddy current (PEC) technique generates responses over a wide range of frequencies, containing more spectral coverage than traditional eddy current inspection. Eddy current pulsed