Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721782321
Category :
Languages : en
Pages : 34
Book Description
The Energy Finite Element Analysis (EFEA) is a finite element based computational method for high frequency vibration and acoustic analysis. The EFEA solves with finite elements governing differential equations for energy variables. These equations are developed from wave equations. Recently, an EFEA method for computing high frequency vibration of structures either in vacuum or in contact with a dense fluid has been presented. The presence of fluid loading has been considered through added mass and radiation damping. The EFEA developments were validated by comparing EFEA results to solutions obtained by very dense conventional finite element models and solutions from classical techniques such as statistical energy analysis (SEA) and the modal decomposition method for bodies of revolution. EFEA results have also been compared favorably with test data for the vibration and the radiated noise generated by a large scale submersible vehicle. The primary variable in EFEA is defined as the time averaged over a period and space averaged over a wavelength energy density. A joint matrix computed from the power transmission coefficients is utilized for coupling the energy density variables across any discontinuities, such as change of plate thickness, plate/stiffener junctions etc. When considering the high frequency vibration of a periodically stiffened plate or cylinder, the flexural wavelength is smaller than the interval length between two periodic stiffeners, therefore the stiffener stiffness can not be smeared by computing an equivalent rigidity for the plate or cylinder. The periodic stiffeners must be regarded as coupling components between periodic units. In this paper, Periodic Structure (PS) theory is utilized for computing the coupling joint matrix and for accounting for the periodicity characteristics. Vlahopoulos, Nickolas Langley Research Center NASA/CR-2005-213760
Energy Finite Element Analysis for Computing the High Frequency Vibration of the Aluminum Testbed Cylinder and Correlating the Results to Test Data
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721782321
Category :
Languages : en
Pages : 34
Book Description
The Energy Finite Element Analysis (EFEA) is a finite element based computational method for high frequency vibration and acoustic analysis. The EFEA solves with finite elements governing differential equations for energy variables. These equations are developed from wave equations. Recently, an EFEA method for computing high frequency vibration of structures either in vacuum or in contact with a dense fluid has been presented. The presence of fluid loading has been considered through added mass and radiation damping. The EFEA developments were validated by comparing EFEA results to solutions obtained by very dense conventional finite element models and solutions from classical techniques such as statistical energy analysis (SEA) and the modal decomposition method for bodies of revolution. EFEA results have also been compared favorably with test data for the vibration and the radiated noise generated by a large scale submersible vehicle. The primary variable in EFEA is defined as the time averaged over a period and space averaged over a wavelength energy density. A joint matrix computed from the power transmission coefficients is utilized for coupling the energy density variables across any discontinuities, such as change of plate thickness, plate/stiffener junctions etc. When considering the high frequency vibration of a periodically stiffened plate or cylinder, the flexural wavelength is smaller than the interval length between two periodic stiffeners, therefore the stiffener stiffness can not be smeared by computing an equivalent rigidity for the plate or cylinder. The periodic stiffeners must be regarded as coupling components between periodic units. In this paper, Periodic Structure (PS) theory is utilized for computing the coupling joint matrix and for accounting for the periodicity characteristics. Vlahopoulos, Nickolas Langley Research Center NASA/CR-2005-213760
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721782321
Category :
Languages : en
Pages : 34
Book Description
The Energy Finite Element Analysis (EFEA) is a finite element based computational method for high frequency vibration and acoustic analysis. The EFEA solves with finite elements governing differential equations for energy variables. These equations are developed from wave equations. Recently, an EFEA method for computing high frequency vibration of structures either in vacuum or in contact with a dense fluid has been presented. The presence of fluid loading has been considered through added mass and radiation damping. The EFEA developments were validated by comparing EFEA results to solutions obtained by very dense conventional finite element models and solutions from classical techniques such as statistical energy analysis (SEA) and the modal decomposition method for bodies of revolution. EFEA results have also been compared favorably with test data for the vibration and the radiated noise generated by a large scale submersible vehicle. The primary variable in EFEA is defined as the time averaged over a period and space averaged over a wavelength energy density. A joint matrix computed from the power transmission coefficients is utilized for coupling the energy density variables across any discontinuities, such as change of plate thickness, plate/stiffener junctions etc. When considering the high frequency vibration of a periodically stiffened plate or cylinder, the flexural wavelength is smaller than the interval length between two periodic stiffeners, therefore the stiffener stiffness can not be smeared by computing an equivalent rigidity for the plate or cylinder. The periodic stiffeners must be regarded as coupling components between periodic units. In this paper, Periodic Structure (PS) theory is utilized for computing the coupling joint matrix and for accounting for the periodicity characteristics. Vlahopoulos, Nickolas Langley Research Center NASA/CR-2005-213760
Energy Finite Element Analysis for Computing the High Frequency Vibration of the Aluminum Testbed Cylinder and Correlating the Results to Test Data
Author: Nickolas Vlahopoulos
Publisher: BiblioGov
ISBN: 9781289250140
Category :
Languages : en
Pages : 24
Book Description
The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.
Publisher: BiblioGov
ISBN: 9781289250140
Category :
Languages : en
Pages : 24
Book Description
The NASA Technical Reports Server (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.
Mechanical and Aerospace Engineering VI
Author: Dashnor Hoxha
Publisher: Trans Tech Publications Ltd
ISBN: 303826993X
Category : Technology & Engineering
Languages : en
Pages : 655
Book Description
Collection of selected, peer reviewed papers from the 2015 6th International Conference on Mechanical and Aerospace Engineering (ICMAE 2015), July 16-17, 2015, Roma, Italy. The 109 papers are grouped as follows: Chapter 1: Designing and Manufacturing in Mechanical Engineering Chapter 2: Dynamics and Vibration of Machines and Mechanisms Chapter 3: Fluids and Thermal Engineering Chapter 4: Researching and Designing of Internal Combustion Engine Chapter 5: Instrumentation, Monitoring, Control Systems and Automatics Chapter 6: Materials and Materials Processing in Mechanical Engineering Chapter 7: Computational Techniques for Simulation and Numerical Analysis Chapter 8: Researching and Designing in Aerospace Engineering
Publisher: Trans Tech Publications Ltd
ISBN: 303826993X
Category : Technology & Engineering
Languages : en
Pages : 655
Book Description
Collection of selected, peer reviewed papers from the 2015 6th International Conference on Mechanical and Aerospace Engineering (ICMAE 2015), July 16-17, 2015, Roma, Italy. The 109 papers are grouped as follows: Chapter 1: Designing and Manufacturing in Mechanical Engineering Chapter 2: Dynamics and Vibration of Machines and Mechanisms Chapter 3: Fluids and Thermal Engineering Chapter 4: Researching and Designing of Internal Combustion Engine Chapter 5: Instrumentation, Monitoring, Control Systems and Automatics Chapter 6: Materials and Materials Processing in Mechanical Engineering Chapter 7: Computational Techniques for Simulation and Numerical Analysis Chapter 8: Researching and Designing in Aerospace Engineering
Annual Index/abstracts of SAE Technical Papers
Meeting of Board of Regents
Author: University of Michigan. Board of Regents
Publisher:
ISBN:
Category :
Languages : en
Pages : 468
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 468
Book Description
Introduction to Finite Element Vibration Analysis
Author: Maurice Petyt
Publisher: Cambridge University Press
ISBN: 9780521634175
Category : Mathematics
Languages : en
Pages : 584
Book Description
First time paperback of successful mechanical engineering book suitable as a textbook for graduate students in mechanical engineering.
Publisher: Cambridge University Press
ISBN: 9780521634175
Category : Mathematics
Languages : en
Pages : 584
Book Description
First time paperback of successful mechanical engineering book suitable as a textbook for graduate students in mechanical engineering.
A Basic Development of a Hybrid Finite Element Method for Mid-frequency Computations of Structural Vibrations
Finite Element Programs for Structural Vibrations
Author: C.T.F. Ross
Publisher: Springer Science & Business Media
ISBN: 1447118863
Category : Science
Languages : en
Pages : 228
Book Description
Finite Element Programs for Structural Vibrations presents detailed descriptions of how to use six computer programs (written in Fortran 77) to determine the resonant frequencies of one, two, and three-dimensional skeletal structures through the finite element method. Chapter 1 is on "The Finite Element Method" and Chapter 2 demonstrates, with the aid of hand calculations, the finite element solution of some smaller structures. Chapter 3 covers "The Modular Approach", and Chapters 4 to 9 describe the six computer programs, with a large number of worked examples. The six computer programs are given in Appendices I through VI, and on a 3 1/2'' disk included with the book. The programs are suitable for use on IBM (or compatible) PC (640K or more) or minicomputer.
Publisher: Springer Science & Business Media
ISBN: 1447118863
Category : Science
Languages : en
Pages : 228
Book Description
Finite Element Programs for Structural Vibrations presents detailed descriptions of how to use six computer programs (written in Fortran 77) to determine the resonant frequencies of one, two, and three-dimensional skeletal structures through the finite element method. Chapter 1 is on "The Finite Element Method" and Chapter 2 demonstrates, with the aid of hand calculations, the finite element solution of some smaller structures. Chapter 3 covers "The Modular Approach", and Chapters 4 to 9 describe the six computer programs, with a large number of worked examples. The six computer programs are given in Appendices I through VI, and on a 3 1/2'' disk included with the book. The programs are suitable for use on IBM (or compatible) PC (640K or more) or minicomputer.
On the Use and the Validity of the Energy Finite Element Method for High Frequency Vibrations
Author: Ilse Moens
Publisher:
ISBN: 9789056822941
Category :
Languages : en
Pages : 230
Book Description
Publisher:
ISBN: 9789056822941
Category :
Languages : en
Pages : 230
Book Description
Finite Elements Analysis: Procedures in Engineering
Author: H. Lakshmininarayana
Publisher: Universities Press
ISBN: 9788173714764
Category : Engineering mathematics
Languages : en
Pages : 268
Book Description
This textbook has emerged from three decades of experience gained by the author in education, research and practice. The basic concepts, mathematical models and computational algorithms supporting the Finite Element Method (FEM) are clearly and concisely developed.
Publisher: Universities Press
ISBN: 9788173714764
Category : Engineering mathematics
Languages : en
Pages : 268
Book Description
This textbook has emerged from three decades of experience gained by the author in education, research and practice. The basic concepts, mathematical models and computational algorithms supporting the Finite Element Method (FEM) are clearly and concisely developed.