scholarly journals Non-linear modal analysis of structural components subjected to unilateral constraints

2017 ◽  
Vol 389 ◽  
pp. 380-410 ◽  
Author(s):  
M. Attar ◽  
A. Karrech ◽  
K. Regenauer-Lieb
Keyword(s):  
Modal Analysis ◽  
Structural Components ◽  
Unilateral Constraints ◽  
Non Linear

Non-linear modal analysis for beams subjected to axial loads: Analytical and finite-element solutions

2008 ◽  
Vol 43 (6) ◽  
pp. 551-561 ◽  
Author(s):  
Carlos E.N. Mazzilli ◽  
César T. Sanches ◽  
Odulpho G.P. Baracho Neto ◽  
Marian Wiercigroch ◽  
Marko Keber
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Axial Loads ◽  
Non Linear

Powertrain Resilient Mounting Design Analysis

2018 ◽  
Author(s):  
Tigran Parikyan ◽  
Nikola Naranca ◽  
Jochen Neher
Keyword(s):  
Rigid Body ◽  
Modal Analysis ◽  
Frequency Domain ◽  
Static Analysis ◽  
Software Tool ◽  
Software Tools ◽  
Forced Response ◽  
Marine Engine ◽  
Linear Elastic ◽  
Non Linear

For efficient modeling of engine (or powertrain) supported by non-linear elastic mounts, a special methodology has been elaborated. Based on it, software tool has been developed to analyze the motion of rigid body and elastic mounts, which comprises of three modules: • Non-linear static analysis; • Modal analysis (undamped and damped); • Forced response (in frequency domain). Application example of a large V12 marine engine illustrates the suggested workflow. The results are verified against other software tools and validated by measurements.

scholarly journals Variable Modal Parameter Identification for Non-Linear Mdof Systems. Part II: Experimental Validation and Advanced Case Study

2000 ◽  
Vol 7 (4) ◽  
pp. 229-240 ◽  
Author(s):  
Y.H. Chong ◽  
M. Imregun
Keyword(s):  
Modal Analysis ◽  
Experimental Validation ◽  
Element Model ◽  
Force Level ◽  
Friction Damper ◽  
Modal Parameter ◽  
Mdof Systems ◽  
Non Linear ◽  
Linear Friction

The purpose of Part II is to provide an experimental validation of the methodology presented in Part I and to consider a representative engineering case, the study of which requires a relatively large numerical model. A beam system with cubic stiffness type non-linearity was used in the experimental study. The non-linear response was measured at three locations and the underlying linear system was obtained via linear modal analysis of low-excitation response data. The non-linear parameter variations were obtained as a function of the modal amplitude and the response of the system was generated for other force levels. The results were found to agree very well with the corresponding measurements, indicating the success of the non-linear modal analysis methodology, even in the presence of true experimental noise. An advanced numerical case study that included both inherent structural damping and non-linear friction damping, was considered next. The linear finite element model of a high-pressure turbine blade was used in conjunction with three local non-linear friction damper elements. It was shown that the response of the system could be predicted at any force level, provided that that non-linear modal parameters were available at some reference force level. The predicted response levels were compared against those obtained from reference simulations and very good agreement was achieved in all cases.

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