Ambesh kumar - Academia.edu (original) (raw)

Papers by Ambesh kumar

Research paper thumbnail of Navigation Method for Pioneer P3-DX Ground Wheeled Robot in V-REP Platform Using Type-2 Fuzzy Neural Network (T2FNN) Architecture

Research paper thumbnail of Prediction of Eigen-frequency of Stiffened Sandwich Composite Plates Using Finite Elements

Materials Today: Proceedings, 2019

This paper presents the natural vibration analysis of stiffened sandwich composite plates (SSCP) ... more This paper presents the natural vibration analysis of stiffened sandwich composite plates (SSCP) using finite elements. The geometry of SSCP mid-plane kinematics has been modelled by using ANSYS parametric design language (APDL) code, which is based on first order shear deformation theory (FSDT). The whole SSCP has been formulated using an eight node serendipity shell 281 element. Firstly, the eigen-frequency values of unstiffened sandwich plate and stiffened composite plates are validated with available benchmark results. Then, the natural frequencies of SSCP by using different combination of lamina orientation as well as no of stiffeners are examined by solving suitable numerical examples and findings are debated in detail.

Research paper thumbnail of Passive Constrained Layer Damping: A State of the Art Review

IOP Conference Series: Materials Science and Engineering, 2019

In this paper authors discuss the advancements made over years in the passive constrained layer d... more In this paper authors discuss the advancements made over years in the passive constrained layer damping (PCLD) technique used for structural vibration control. To start with, the paper presents a brief literature survey on passive damping techniques using viscoelastic materials (VEM) emphasizing unconstrained layer damping (UCLD) followed by PCLD. The discussion on PCLD technique includes different mathematical models and experimental investigations related to it. Finally, the various design modifications proposed by the different researchers in order to improve the performance of conventional PCLD configuration in presented.

Research paper thumbnail of Performance of a graphite wafer-reinforced viscoelastic composite layer for active-passive damping of plate vibration

Composite Structures, 2018

In this work, an actively constrained viscoelastic layer over the surface of a substrate plate is... more In this work, an actively constrained viscoelastic layer over the surface of a substrate plate is supposed to be reinforced with a rectangular array of thin graphite-wafers, and the effects of the inclusions on the active-passive damping characteristics of the overall plate are investigated. The inclusions of graphite-wafers in the viscoelastic layer result in a 0-3 viscoelastic composite (VEC) layer. Its (VEC) stiffness and damping properties are distributed in a predefined manner for improved active-passive damping through all the transverse and in-plane strains of the viscoelastic phase. A finite element (FE) model of the overall plate is developed for its static and dynamic analyses. The static analysis reveals the mechanisms of active-passive damping. In the dynamic analysis, first, the damping in the plate is quantified for different sets of values of dimensions in the arrangement of graphite-wafers. These results suggest appropriate geometric configuration of the graphite-wafers for maximum enhancement of active-passive damping. So, the geometric configuration of 0-3 VEC layer is optimized, and finally the controlled frequency responses of the overall plate are presented. The results reveal significantly improved active-passive damping in the overall plate for the inclusions of graphite-wafers within the actively constrained viscoelastic layer in an optimal manner.

Research paper thumbnail of A design of active constrained layer damping treatment for vibration control of circular cylindrical shell structure

Journal of Vibration and Control, 2016

A new 1-3 viscoelastic composite material (VECM) layer is designed for improved active constraine... more A new 1-3 viscoelastic composite material (VECM) layer is designed for improved active constrained layer damping (ACLD) treatment of vibration of a functionally graded (FG) circular cylindrical shell. Besides this improved active damping treatment, another objective of this study is to control all the modes of vibration of the shell effectively using the treatment (active constrained layer damping) in layer-form throughout the outer shell-surface. In this design of active constrained layer damping treatment in layer-form, its (active constrained layer damping) necessary conformability with the curved host shell-surface is ensured by the use of a vertically reinforced 1-3 piezoelectric composite (PZC) constraining layer, whereas the effective control of several modes of vibration of the shell is achieved by the use of electrode-patches over the surfaces of the constraining layer. A fruitful strategy in the arrangement of electrode-patches is proposed for effective control of several ...

Research paper thumbnail of Augmented constrained layer damping in plates through the optimal design of a 0-3 viscoelastic composite layer

Journal of Vibration and Control, 2018

In this work, a new 0-3 viscoelastic composite (VEC) layer is presented for augmented constrained... more In this work, a new 0-3 viscoelastic composite (VEC) layer is presented for augmented constrained layer damping of plate vibration. The 0-3 VEC layer comprises a rectangular array of the thin rectangular graphite-wafers embedded within the viscoelastic matrix. The inclusions of graphite-wafers in the constrained 0-3 VEC layer confine the motion of the viscoelastic phase for its reasonable in-plane strains along with the enhanced transverse shear strains. This occurrence of coincidental shear and extensional strains within the viscoelastic phase is supposed to cause augmented damping capacity of the constrained layer, and it is investigated by integrating the constrained 0-3 VEC layer over the top surface of a substrate plate. A finite element (FE) model of the overall plate is developed based on the layer-wise shear deformation theory. Using this FE model, first, a bending analysis of the overall plate is performed to investigate the mechanisms of damping in the use of 0-3 VEC layer...

Research paper thumbnail of Design of a 1-3 viscoelastic composite layer for improved free/constrained layer passive damping treatment of structural vibration

Composites Part B: Engineering, 2016

A new 1-3 viscoelastic composite material (VECM) layer is designed in order to achieve improved p... more A new 1-3 viscoelastic composite material (VECM) layer is designed in order to achieve improved passive damping characteristics of the unconstrained (UCLD)/constrained (PCLD) layer damping treatment of structural vibration. The present 1-3 VECM layer is used instead of traditional monolithic viscoelastic material (VEM) layer within the UCLD/PCLD treatment. The corresponding change in damping is studied through the static as well as dynamic finite element (FE) analyses of a substrate beam integrated with the UCLD/PCLD treatment. The static analysis reveals augmentations of damping in the use of 1-3 VECM layer. The dynamic analysis quantifies improvement in the passive unconstrained/constrained layer damping through the present design.

Research paper thumbnail of Study of Water Quality Parameters in Bhopal Upper Lake Using LANDSAT 5 TM Satellite Data

Research paper thumbnail of Optimal Damping in Circular Cylindrical Sandwich Shells With a Three-Layered Viscoelastic Composite Core

Journal of Vibration and Acoustics, 2017

In this work, the damping characteristics of circular cylindrical sandwich shell with a three-lay... more In this work, the damping characteristics of circular cylindrical sandwich shell with a three-layered viscoelastic composite core are investigated. The new composite core is composed of the identical inclusions of graphite-strips which are axially embedded within a cylindrical viscoelastic core at its middle surface. The physical configuration of the composite core is attributed in the form of a cylindrical laminate of two identical monolithic viscoelastic layers over the inner and outer cylindrical surfaces of middle viscoelastic composite layer so that it is a three-layered viscoelastic composite core. A finite element (FE) model of the overall shell is developed based on the layerwise deformation theory and Sander's shell theory. Using this FE model, the damping characteristics of the shell are studied within an operating frequency range after configuring the size and circumferential distribution of graphite-strips in optimal manner. The numerical results reveal significantly...

Research paper thumbnail of Navigation Method for Pioneer P3-DX Ground Wheeled Robot in V-REP Platform Using Type-2 Fuzzy Neural Network (T2FNN) Architecture

Research paper thumbnail of Prediction of Eigen-frequency of Stiffened Sandwich Composite Plates Using Finite Elements

Materials Today: Proceedings, 2019

This paper presents the natural vibration analysis of stiffened sandwich composite plates (SSCP) ... more This paper presents the natural vibration analysis of stiffened sandwich composite plates (SSCP) using finite elements. The geometry of SSCP mid-plane kinematics has been modelled by using ANSYS parametric design language (APDL) code, which is based on first order shear deformation theory (FSDT). The whole SSCP has been formulated using an eight node serendipity shell 281 element. Firstly, the eigen-frequency values of unstiffened sandwich plate and stiffened composite plates are validated with available benchmark results. Then, the natural frequencies of SSCP by using different combination of lamina orientation as well as no of stiffeners are examined by solving suitable numerical examples and findings are debated in detail.

Research paper thumbnail of Passive Constrained Layer Damping: A State of the Art Review

IOP Conference Series: Materials Science and Engineering, 2019

In this paper authors discuss the advancements made over years in the passive constrained layer d... more In this paper authors discuss the advancements made over years in the passive constrained layer damping (PCLD) technique used for structural vibration control. To start with, the paper presents a brief literature survey on passive damping techniques using viscoelastic materials (VEM) emphasizing unconstrained layer damping (UCLD) followed by PCLD. The discussion on PCLD technique includes different mathematical models and experimental investigations related to it. Finally, the various design modifications proposed by the different researchers in order to improve the performance of conventional PCLD configuration in presented.

Research paper thumbnail of Performance of a graphite wafer-reinforced viscoelastic composite layer for active-passive damping of plate vibration

Composite Structures, 2018

In this work, an actively constrained viscoelastic layer over the surface of a substrate plate is... more In this work, an actively constrained viscoelastic layer over the surface of a substrate plate is supposed to be reinforced with a rectangular array of thin graphite-wafers, and the effects of the inclusions on the active-passive damping characteristics of the overall plate are investigated. The inclusions of graphite-wafers in the viscoelastic layer result in a 0-3 viscoelastic composite (VEC) layer. Its (VEC) stiffness and damping properties are distributed in a predefined manner for improved active-passive damping through all the transverse and in-plane strains of the viscoelastic phase. A finite element (FE) model of the overall plate is developed for its static and dynamic analyses. The static analysis reveals the mechanisms of active-passive damping. In the dynamic analysis, first, the damping in the plate is quantified for different sets of values of dimensions in the arrangement of graphite-wafers. These results suggest appropriate geometric configuration of the graphite-wafers for maximum enhancement of active-passive damping. So, the geometric configuration of 0-3 VEC layer is optimized, and finally the controlled frequency responses of the overall plate are presented. The results reveal significantly improved active-passive damping in the overall plate for the inclusions of graphite-wafers within the actively constrained viscoelastic layer in an optimal manner.

Research paper thumbnail of A design of active constrained layer damping treatment for vibration control of circular cylindrical shell structure

Journal of Vibration and Control, 2016

A new 1-3 viscoelastic composite material (VECM) layer is designed for improved active constraine... more A new 1-3 viscoelastic composite material (VECM) layer is designed for improved active constrained layer damping (ACLD) treatment of vibration of a functionally graded (FG) circular cylindrical shell. Besides this improved active damping treatment, another objective of this study is to control all the modes of vibration of the shell effectively using the treatment (active constrained layer damping) in layer-form throughout the outer shell-surface. In this design of active constrained layer damping treatment in layer-form, its (active constrained layer damping) necessary conformability with the curved host shell-surface is ensured by the use of a vertically reinforced 1-3 piezoelectric composite (PZC) constraining layer, whereas the effective control of several modes of vibration of the shell is achieved by the use of electrode-patches over the surfaces of the constraining layer. A fruitful strategy in the arrangement of electrode-patches is proposed for effective control of several ...

Research paper thumbnail of Augmented constrained layer damping in plates through the optimal design of a 0-3 viscoelastic composite layer

Journal of Vibration and Control, 2018

In this work, a new 0-3 viscoelastic composite (VEC) layer is presented for augmented constrained... more In this work, a new 0-3 viscoelastic composite (VEC) layer is presented for augmented constrained layer damping of plate vibration. The 0-3 VEC layer comprises a rectangular array of the thin rectangular graphite-wafers embedded within the viscoelastic matrix. The inclusions of graphite-wafers in the constrained 0-3 VEC layer confine the motion of the viscoelastic phase for its reasonable in-plane strains along with the enhanced transverse shear strains. This occurrence of coincidental shear and extensional strains within the viscoelastic phase is supposed to cause augmented damping capacity of the constrained layer, and it is investigated by integrating the constrained 0-3 VEC layer over the top surface of a substrate plate. A finite element (FE) model of the overall plate is developed based on the layer-wise shear deformation theory. Using this FE model, first, a bending analysis of the overall plate is performed to investigate the mechanisms of damping in the use of 0-3 VEC layer...

Research paper thumbnail of Design of a 1-3 viscoelastic composite layer for improved free/constrained layer passive damping treatment of structural vibration

Composites Part B: Engineering, 2016

A new 1-3 viscoelastic composite material (VECM) layer is designed in order to achieve improved p... more A new 1-3 viscoelastic composite material (VECM) layer is designed in order to achieve improved passive damping characteristics of the unconstrained (UCLD)/constrained (PCLD) layer damping treatment of structural vibration. The present 1-3 VECM layer is used instead of traditional monolithic viscoelastic material (VEM) layer within the UCLD/PCLD treatment. The corresponding change in damping is studied through the static as well as dynamic finite element (FE) analyses of a substrate beam integrated with the UCLD/PCLD treatment. The static analysis reveals augmentations of damping in the use of 1-3 VECM layer. The dynamic analysis quantifies improvement in the passive unconstrained/constrained layer damping through the present design.

Research paper thumbnail of Study of Water Quality Parameters in Bhopal Upper Lake Using LANDSAT 5 TM Satellite Data

Research paper thumbnail of Optimal Damping in Circular Cylindrical Sandwich Shells With a Three-Layered Viscoelastic Composite Core

Journal of Vibration and Acoustics, 2017

In this work, the damping characteristics of circular cylindrical sandwich shell with a three-lay... more In this work, the damping characteristics of circular cylindrical sandwich shell with a three-layered viscoelastic composite core are investigated. The new composite core is composed of the identical inclusions of graphite-strips which are axially embedded within a cylindrical viscoelastic core at its middle surface. The physical configuration of the composite core is attributed in the form of a cylindrical laminate of two identical monolithic viscoelastic layers over the inner and outer cylindrical surfaces of middle viscoelastic composite layer so that it is a three-layered viscoelastic composite core. A finite element (FE) model of the overall shell is developed based on the layerwise deformation theory and Sander's shell theory. Using this FE model, the damping characteristics of the shell are studied within an operating frequency range after configuring the size and circumferential distribution of graphite-strips in optimal manner. The numerical results reveal significantly...