Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


27916.pdf (54.5 MB)

ETD Abstract Container

Abstract Header

Design and Validation of a MIMO Nonlinear Vibration Test Rig with Hardening Stiffness Characteristics in Multiple Degrees of Freedom

Pandiya, Nimish
http://orcid.org/0000-0002-4671-272X
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504879018436068

Abstract Details

2017, MS, University of Cincinnati, Engineering and Applied Science: Mechanical Engineering.
Historically, efforts towards vibration testing for nonlinear applications have been focused on single modes in continuous models or rigid body modes in multiple degree of freedom (MDOF) models with nonlinear connecting elements. The motivation behind the presented thesis work was performing Multiple Input Multiple Output (MIMO) measurements for analysis of the vibration data sets for assisting the development of time domain mathematical models based on Nonlinear Auto-Regressive (Moving Average) with eXogenous input (NAR(MA)X) approach. A nonlinear vibration test rig was designed for acquiring data for research on nonlinear vibrations at the Structural Dynamics Research Laboratory at the University of Cincinnati (UC-SDRL). The pre-manufacturing process for the test rig consisted of hand calculations for setting the dimensions of the test specimen, creating a model using SolidWorks, and Finite Element Analysis (FEA) using ANSYS Static Structural and Modal modules. Post manufacturing and installation, several tests were carried out on the test rig to validate the simulation results. The experimental static force displacement curve was seen to match closely with simulation results, as did the modal frequencies and shape vectors. Step relaxation was chosen as the input technique for several reasons that rendered it the best option available. Time domain data analysis as carried out using the Unified Matrix Polynomial Approach (UMPA) on small contiguous chunks of data. This was helpful to visualize frequency shifts with respect to time and observe the nonlinear behavior of the specimen in the test rig. The results match closely with the expected values for the modal frequencies and the nonlinear behavior desired from the design is experimentally seen and documented.
Randall Allemang, Ph.D. (Committee Chair)
David Brown, Ph.D. (Committee Member)
Allyn Phillips, Ph.D. (Committee Member)
134 p.
Mechanical Engineering; Mechanics
nonlinear vibration; test rig; multiple input multiple output MIMO; multiple degrees of freedom MDOF; testing; structural dynamics

Recommended Citations

Citations

  • Pandiya, N. (2017). Design and Validation of a MIMO Nonlinear Vibration Test Rig with Hardening Stiffness Characteristics in Multiple Degrees of Freedom [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504879018436068

    APA Style (7th edition)

  • Pandiya, Nimish. Design and Validation of a MIMO Nonlinear Vibration Test Rig with Hardening Stiffness Characteristics in Multiple Degrees of Freedom. 2017. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504879018436068.

    MLA Style (8th edition)

  • Pandiya, Nimish. "Design and Validation of a MIMO Nonlinear Vibration Test Rig with Hardening Stiffness Characteristics in Multiple Degrees of Freedom." Master's thesis, University of Cincinnati, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504879018436068

    Chicago Manual of Style (17th edition)

ucin1504879018436068
222
© 2017, some rights reserved.Creative Commons License Design and Validation of a MIMO Nonlinear Vibration Test Rig with Hardening Stiffness Characteristics in Multiple Degrees of Freedom by Nimish Pandiya is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.