An alternative to modal analysis for material stiffness and damping identification from vibrating plates

2010 ◽  
Vol 329 (10) ◽  
pp. 1653-1672 ◽  
Author(s):  
Alain Giraudeau ◽  
Fabrice Pierron ◽  
Baoqiao Guo
Keyword(s):  
Modal Analysis ◽  
Material Stiffness ◽  
Vibrating Plates ◽  
Stiffness And Damping Identification ◽  
Stiffness And Damping

Some Remarks on the Identification of Damping Parameters at the Boundary of Vibrating Systems

1995 ◽  
Vol 48 (11S) ◽  
pp. S107-S110
Author(s):  
Peter Hagedorn ◽  
Ulrich Pabst
Keyword(s):  
Mathematical Modeling ◽  
Modal Analysis ◽  
Mechanical Systems ◽  
Experimental Modal Analysis ◽  
Steel Beam ◽  
Modal Data ◽  
Stiffness And Damping ◽  
Parameter Values ◽  
Vibrating Systems

In many cases, vibrating mechanical systems permit a reliable mathematical modeling with parameter values which are reasonably well known beforehand, except for the joints between different subsystems and at the boundaries. The boundary stiffness, which is often assumed as infinite, and the damping at the boundary, which is frequently ignored, are typically not well known. In this note, we discuss the identification of the boundary stiffness and damping parameters from modal data. As an example, we treat an elastic steel beam, for which an experimental modal analysis had been carried out in our laboratory.

High Frequency Analysis of a Dynamically Coupled Parallel Plate System

2017 ◽  
Author(s):  
Dean R. Culver ◽  
Earl Dowell
Keyword(s):  
Modal Analysis ◽  
Frequency Analysis ◽  
High Frequency ◽  
Parallel Plate ◽  
Damping Ratio ◽  
Parallel Plates ◽  
Linear Spring ◽  
Stiffness And Damping ◽  
Plate System

The behavior of a system comprised of two parallel plates coupled by a discrete, linear spring and damper is studied. Classical Modal Analysis (CMA) is used to illustrate this behavior, while specifically observing the effects of varying the stiffness and damping ratio of the coupling elements. Conditions under which the coupling may be approximated as rigid are identified. Additionally, conditions under which the coupling displacement reaches its maximum and minimum values are identified. This work also lays the groundwork for extending Asymptotic Modal Analysis (AMA) to systems with discrete, elastic, and dissipative coupling.

Dynamic Characteristics Analysis for Seismic Vibrator

2014 ◽  
Vol 472 ◽  
pp. 48-55
Author(s):  
Li Qiang An ◽  
Fan Peng Kong ◽  
Yong Fang Wang
Keyword(s):  
Modal Analysis ◽  
Dynamic Characteristics ◽  
Data Transfer ◽  
Element Model ◽  
Dynamics Simulation ◽  
Characteristic Analysis ◽  
Characteristics Analysis ◽  
Stiffness And Damping ◽  
Multi Body ◽  
Seismic Vibrator

Seismic vibrator is one of the most widely used equipments in exploration field. In recent years, with the development of exploration field, as well as the growing needs of high quality seismic data, the seismic vibrator's tonnage has increased a lot, which makes the stress of the vehicle frame very complicated in working state. And some local structure of the vehicle frame often appears crack phenomenon in working state. Therefore, the dynamic characteristic analysis is essential to the Seismic vibrator. In this paper, the finite element model of vehicle frame is established by ANSYS software. Through the modal analysis, the natural frequencies are obtained, and each vibration modes are analyzed. On the basis of the modal analysis, the modal neutral file of the vehicle frame is established. Using the data transfer function between ANSYS and ADAMS, the rigid-flexible coupling multi-body model is built for the dynamics simulation of the seismic vibrator. In this model, the stiffness and damping of air springs, hydraulic oil and soil are simulated by the spring-damper in the ADAMS software. The dynamic characteristics of vehicle frame under excited forces with different amplitude are obtained and analyzed. The stresses for some of the hot spots of the vehicle frame are extracted, which can be used to analyze the dynamic failure of the vehicle frame.

Modal Analysis of Maglev Linear Feed Unit

2012 ◽  
Vol 150 ◽  
pp. 205-210 ◽  
Author(s):  
Long Xue Xiao ◽  
Guo Qing Wu ◽  
Xu Dong Zhang
Keyword(s):  
Modal Analysis ◽  
Natural Frequency ◽  
Machine Tools ◽  
Electromagnetic Levitation ◽  
Milling Machine ◽  
Ansys Software ◽  
Solid Foundation ◽  
Working Principle ◽  
Stiffness And Damping ◽  
Feed Unit

The structural and working principle of a kind of maglev linear feed unit for CNC engraving and milling machine tools are presented, and its mathematical model is analyzed, then its model of vibration is established in this paper. The modal analysis is made, the natural frequency is calculated with its vibration models, and the influence on the natural frequency of electromagnetic levitation bearing unit, which is caused by stiffness and damping coefficients of electromagnetic levitation bearing, is analyzed respectively by means of ANSYS software. The calculation and analysis presented in this paper can help us design the structure of the maglev linear feed unit for CNC engraving and milling machine tools, and can also establish a solid foundation for further etailed dynamics analysis.

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