Experimental modal analysis a simple nonmathematical presentation peter avitabile, university of massachusetts lowell, lowell, massachusetts could you explain modal analysis for me. Peter avitabile, university of massachusetts lowell, lowell, massachusetts. The development of the concept of consistency of modal vectors. Just what are these measurements that are called frfs. You might also want to remember the discussion we had before when you asked me about what modal analysis was all about could you explain modal analysis.
I highly recommend you to read a book called modal space, wrote by professor peter avitabile. Experimental modal analysis a simple nonmathematical presentation. Understanding structural dynamic modification and the effects of truncation. This course focuses on additional test and analysis tools beyond those presented in the basic modal analysis. Wright modal analysis and strain gage testing of finnedtube heat exchanger 1216 chris d. Frequency response function substructuring revision a. References for modal analysis and structural dynamics. Modal testing by peter avitabile overdrive rakuten. Modal space articles education structural dynamics. This enhanced performance has created safety concerns related to ball. Peter avitabile, pe professor, mechanical engineering university of massachusetts lowell. Topics include operating data, multiple input multiple course. A practitioners guide kindle edition by avitabile, peter. Click download or read online button to get theoretical and experimental modal analysis book now.
This model is defined as a set of natural frequencies with damping factor and natural modes vibration. Pdf a correlation coefficient for modal vector analysis. Summary modal analysis is the study of the dynamic character of a system that is defined. These independent estimates of the same modal vector need to be processed into a single best estimate of that particular modal vector. Download it once and read it on your kindle device, pc, phones or tablets. The particular solution in the one of interest here. Structure dynamic analysis of a horizontal axis wind. In other words, the complexity of understanding it is overrated. Peter avitabile structural dynamics and acoustic systems laboratory university of massachusetts lowell lowell, massachusetts 018542881 abstract teaching structural dynamic modeling approaches in an educational curriculum is described for the modal option in the umass lowell program.
Director of the modal analysis and controls laboratory. Peter avitabile modal testing a practitioners guide world. The practical, clear, and concise guide for conducting experimental modal tests. Teaching structural dynamic modeling techniques in the umass. Excellent text on a wide variety of structural dynamics topics. Peter avitabile, professor at the university of massachusetts lowell. Designed to be accessible, modal testing presents the most common excitation techniques used for modal testing today and is filled with illustrative examples related to impact testing which is the most widely used excitation technique for traditional experimental modal tests.
Peter avitabile 3, presents a nonmathematical presentation of experimental modal analysis, which give an idea on modal analysis, frequency response functions. He has written hundreds of papers and articles on analytical and experimental modal analysis techniques, including. The theoretical modal analysis of solid model leads to a description of the behavior of the structure as modes of vibration socalled the modal model. Peter avitabile, isprofessor emeritus at the university of massachusetts lowell, the codirector, structural dynamics and acoustic systems laboratory, and the former president for society for experimental mechanics. Sep 15, 2017 modal analysis is the study of the dynamic character of a system that is defined independently from the loads applied to the system and the response of the system. April 98 could you explain the difference between the time domain, frequency domain and modal space. Excitation techniques dos and donts the modal shop. Analytical methods modal applications basics of modal analysis experimental techniques multi degree of freedom testing boundary conditions in environmental testing operational modal analysis modal parameter. Peter avitabile, professor of mechanical engineering at the university of massachusetts lowell, and were later published under the title of modal space back to basics by society for experimental mechanics and blackwell publishing 1998 to 2014. The international journal of analytical and experimental modal analysis, 64 215235. The text draws on the authors extensive experience to cover the practical side of the concerns that may arise when performing an experimental. We use modal analysis to help design all types of structures including automotive struc. Jimin he and zhifang fu modal analysis, utterworth heinemann, 2004 isbn. Structure dynamic analysis of a horizontal axis wind turbine system using a modal analysis method article in wind engineering 254.
Modal testing wiley online books wiley online library. In this context, i read a series of posts from pete avitabile in his wonderfully explained read spoonfed publications. In recent years, sporting goods companies have made increasing use of structural analysis, particularly in the area of dynamics, to optimize the performance of baseball bats. This site is like a library, use search box in the widget to get ebook that you want. In addition, he is the associate editor of the handbook for experimental structural mechanics. Virtual experimental modal analysis of a cantilever beam. This course is derived from a series of undergraduate and graduate level courses taught at the university of massachusetts lowell dynamic systems, vibrations, spectral analysis, structural dynamic modeling techniques, experimental modal analysis, structural dynamics by dr. Examples would include measuring the vibration of a cars body when it is attached to a shaker, or the noise pattern in a room when excited by a loudspeaker. Peter avitabile 3, presents a nonmathematical presentation of experimental modal analysis, which give an idea on modal analysis, frequency response functions, difference between shaker test and impact test, effect of. This chapter explains some concepts about how structures vibrate and introduces aspects of modal analysis that are used to solve structural dynamic problems. Awari 2014 analysis of natural frequency and mode shape of all edge fixed condition plate with. Modal analysis is a method to describe a structure in terms of its natural.
This practical text is not about developing the details of the theory. Nonlinear modal analysis methods for engineering structures by hugo ramon elizalde siller department of mechanical engineering imperial college london university of london a thesis submitted for the degree of doctor of philosophy august, 2004. This presentation aims on the experimental approaches on modal analysis and explains how structure vibrates. Multiple, independent modal vector estimates may be generated whenever multiple rows or columns of the frequency response function matrix are available. Teaching structural dynamic modeling techniques in the. Peter avitabile modal testing a practitioners guide. In the modal analysis of plane frames the main aim is to determine the natural mode shapes and frequencies of an object or structure during free vibration. A practitioners guide outlines the basic information necessary to conduct an experimental modal test. Analytical methods i a procedure for an improved reduced system irs model. Topics include operating data, multiple input multiple course output testing, advanced multiple reference modal parameter estimation, structural. First, the basics of technical concepts and practical handson performance of. Download product flyer is to download pdf in new tab. Top10 issues in modal testing there is plenty of information that will help you to be careful when you are involved in a modal analysis project whether it be analytical or experimental.
Understanding both the natural frequency and mode shape helps to design my structural system for noise and vibration applications. Peter avitabile, university of massachusetts lowell, lowell. Modal space in our own little world by pete avitabile. Modal analysis is the study of the dynamic character of a system that is defined independently from the loads applied to the system and the response of the system.
February 98 could you explain modal analysis for me. So the observed difference at the system modal frequencies does not detract from equation 31. He has written hundreds of papers and articles on analytical and experimental modal. Peter avitabile, university of massachusetts lowell, lowell, massachusetts this article is based on a series published in experimental techniques under the title modal space back to basics as the last article in the series and is presented here with permission from sem society for experimental mechanics. Theoretical and experimental modal analysis download. Peter avitabile, pe professor, mechanical engineering university of massachusetts lowell recent advances in measured data expansion for fullfield dynamic response and dynamic strain for linear and nonlinear systems and additional applications and some other cool stuff going on in the sdasl lab.
Model reduction 061904 university of massachusetts lowell. The complementary part of the solution has already been discussed in chapter 2. Structural dynamics is an area that covers experimental, analytical, and computational methods for determining the. Structure dynamic analysis of a horizontal axis wind turbine. Modal analysis is the study of the dynamic properties of systems in the frequency domain. Peter avitabile is professor emeritus at the university of massachusetts lowell. Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.
Peter avitabile is professor emeritus at the university of massachusetts lowell, the codirector of the structural dynamics and acoustic systems laboratory, and the former president for the society for experimental mechanics. The collection presents early findings and case studies on fundamental and applied aspects of modal analysis, including papers on. The practical, clear, and concise guide for conducting experimental modal tests modal testing. Modal analysis is an essential technology behind solving todays noise and vibration problems. Peter avitabile experimental modal analysis, modal analysis and ontrols laboratory university of massachusetts lowell 3. It will tell you vividly what mode is and what is the usefulness of modal analysis.
Chapter 3 model reduction techniques peter avitabile. Other readers will always be interested in your opinion of the books youve read. The text draws on the authors extensive experience to cover the practical side of the concerns that may arise when performing an experimental modal test. About the author peter avitabile is professor emeritus at the university of massachusetts lowell, the codirector of the structural dynamics and acoustic systems laboratory, and the former president for the society for experimental mechanics. So, basically, modal analysis is the study of the natural characteristics of structures. The following is the list of articles currently available. The international journal of analytical and experimental modal analysis, 63 189200.
237 740 5 1330 1505 272 932 833 605 66 681 1306 818 1219 246 174 176 664 762 412 648 1310 923 1162 407 450 1309 1427 60 312 781 316 1102 1210 225