Data Mining Practical Machine Learning Tools and Techniques

Artificial intelligence for fault diagnosis of rotating machinery: A review

Applications of machine learning to machine fault diagnosis: A review and roadmap

Wavelets for fault diagnosis of rotary machines: A review with applications

Intelligent fault diagnosis techniques have replaced time-consuming and unreliable human analysis, increasing the efficiency of fault diagnosis. Deep learning models can improve the accuracy of intelligent fault diagnosis with the help of their multilayer nonlinear mapping ability. This paper proposes a novel method named Deep Convolutional Neural Networks with Wide First-layer Kernels (WDCNN). The proposed method uses raw vibration signals as input (data augmentation is used to generate more inputs), and uses the wide kernels in the first convolutional layer for extracting features and suppressing high frequency noise. Small convolutional kernels in the preceding layers are used for multilayer nonlinear mapping. AdaBN is implemented to improve the domain adaptation ability of the model. The proposed model addresses the problem that currently, the accuracy of CNN applied to fault diagnosis is not very high. WDCNN can not only achieve 100% classification accuracy on normal signals, but also outperform the state-of-the-art DNN model which is based on frequency features under different working load and noisy environment conditions.

A New Deep Learning Model for Fault Diagnosis with Good Anti-Noise and Domain Adaptation Ability on Raw Vibration Signals

The paper presents the comparative study of the biodynamic response of human body in standing and seated position. A 3D model of the human body in standing and seated position are generated based on anthropometric data for Indian male subject in SolidWorks. The finite element tool, ANSYS-Mechanical was used to perform modal analysis and to obtain natural frequencies and associated mode shapes for both positions. The principal resonance in both standing and seated position occurred at 5–6 Hz. Further, the responses of the models to seat/floor excitation are derived through harmonic analysis. The frequency response of the human body to low-frequency vibration in both positions was determined in terms of normalized apparent mass and acceleration ratio. Both FE model was able to predict the response of human body that matches with data reported in the published literature. The model will be useful to predict the vibration response of human body under various vibration environments encountered in daily life.

Biodynamic Responses of Human Body in Standing and Seated Position

Carbon nanotube fillers in polymers are quite effective compared to traditional carbon black micro particles, primarily due to their high aspect ratios. Increasing attention is being focused on the carbon nanotube surface, namely, the interface between the carbon nanotube and the surrounding polymer matrix. From micromechanics, it is through shear stress build-up at this interface that stress is transferred from the matrix to the carbon nanotube. Because of the dissimilarity in elastic properties of polymer matrix and carbon nanotube, there will usually be some asymmetry near the crack tip even if the geometry and loading are symmetric and interface cracks tend to be mixed mode. In this article, the effect of crack on the interface of polymer matrix and carbon nanotube is analysed using both analytical and extended finite element method. The delamination is modelled as an interface crack problem and stress intensity factor and energy release rate is calculated as a function of crack length and stiffness r...

Effect of crack and determination of fracture energy of carbon nanotube–reinforced polymer composites

Effect of thickness stretching and electro-mechanical loading on sandwich FGM plate with piezoelectric face sheet with different boundary conditions: A semi-analytical approach

The purpose of this paper is to investigate the flexible structure of parabolic shell using photostrictive actuators. The analysis is made to know its dynamic behavior and light-induced control forces for coupled parabolic shell. The effects of an actuator location as well as membrane and bending components under the control action have been analyzed considering the approximate spherical model. The parabolic membrane shell accuracy is being mathematically approximated and validated comparing the light induced control forces using approximate equivalent spherical shell model. The parabolic shell with kapton smart material and photostrictive actuators has been used to formulate the governing equation in the transverse direction. The Kirchhoff-Love assumptions are used to obtain the governing equation of shell with actuator. The mechanical membrane forces and bending moments for parabolic thin shell with actuator is used to analyze the dynamic effect. The results show that membrane control action is much more significant than bending control action. Photostrictive actuators oriented along circumferential direction (actuator-2) can give better control effect than actuators placed along longitudinal direction (actuator-1). The slight difference is observed between spherical and parabolic shell for a surface with focal length to the diameter ratio of 1.00 or more than unity. Space applications often have the shape of parabolical shells or shell of revolution, due to their required focusing, aiming, or reflecting performance. The present approach is focused that photostrictive actuators can effectively control the vibration of parabolical membrane shell. Also, the actuator\'s location plays an important role in defining the control force.

S. P. Harsha

Papers

Biodynamic Responses of Human Body in Standing and Seated Position

Effect of crack and determination of fracture energy of carbon nanotube–reinforced polymer composites

Effect of thickness stretching and electro-mechanical loading on sandwich FGM plate with piezoelectric face sheet with different boundary conditions: A semi-analytical approach

Effects of photostrictive actuator and active control of flexible membrane structure

Analyzing behaviour of a rail wheel assembly with alumino thermite weldment with modal analysis simulations in ANSYS