Modal analysis of a deployable truss using the finite element method

The paper presents an analysis of the damping of laminated beams with four different stacking sequences. The experimental investigation was conducted using tensile cyclic tests for different laminates studied. The impulse technique was chosen to perform modal analysis of the ease of implementation and quickness of the test. The numerical analysis is performed by the finite element method using beam element. The difference between strain energies for both cases damaged and undamaged are calculated by the finite element method. The structural damping of the different beams is evaluated from these energies. The decrease in frequency for different rates of loading shows the loss of stiffness for all materials studied.

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Augmented Reality Visualization of Modal Analysis Using the Finite Element Method

Applied Sciences ◽

10.3390/app11031310 ◽

2021 ◽

Vol 11 (3) ◽

pp. 1310

Author(s):

Merve Yavuz Erkek ◽

Selim Erkek ◽

Elmira Jamei ◽

Mehdi Seyedmahmoudian ◽

Alex Stojcevski ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element Analysis ◽

Finite Element ◽

Augmented Reality ◽

Modal Analysis ◽

Real World ◽

The Finite Element Method ◽

Element Analysis ◽

Simulation Results ◽

Element Method

Modal analysis provides the dynamic behavior of an object or structure, and is often undertaken using the Finite Element Method (FEM) due to its ability to deal with arbitrary geometries. This article investigates the use of Augmented Reality (AR) to provide the in situ visualization of a modal analysis for an aluminum impeller. Finite Element Analysis (FEA) software packages regularly use heat maps and shape deformation to visualize the outcomes of a given simulation. AR allows the superimposition of digital information on a view of the real-world environment, and provides the opportunity to overlay such simulation results onto real-world objects and environments. The presented modal analysis undertaken herein provides natural frequencies and the corresponding deformation of an aluminum impeller. The results indicate the ability for the design part and finite element analysis results to be viewed on the physical part. A mobile AR-FEA-based system was developed for Modal Analysis result visualization. This study offers designers and engineers a new way to visualize such simulation results.

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Study of Metallic Housing of the Adder Gearbox to Reduce the Noise and to Improve the Design Solution

Metals ◽

10.3390/met11060912 ◽

2021 ◽

Vol 11 (6) ◽

pp. 912

Author(s):

Nicoleta Gillich ◽

Nicolae Sîrbu ◽

Sorin Vlase ◽

Marin Marin

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Modal Analysis ◽

Design Solution ◽

Experimental Measurements ◽

The Finite Element Method ◽

Lower Weight ◽

Metal Construction ◽

Element Method

In the manufacture of commercial trucks, used in oil installations or the army, two identical engines are used on a single chassis, whose power is summed by a gearbox, a compact metal construction, which must meet multiple operating requirements. The paper studies the behavior of such an adding box, currently used in manufacturing, and an improved, welded solution that produces less noise and has a lower weight. The finite element method is used for modeling the gearbox in order to analyze stresses and strains and obtain a modal analysis of the system. The results obtained from the calculation are then verified by experimental measurements. The two versions are analyzed in parallel to highlight the advantages of the second version.

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Study on the Modal Analysis of the Cleaning Mechanical Drive Axle Housing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.2670 ◽

2012 ◽

Vol 538-541 ◽

pp. 2670-2674

Author(s):

Xiao Zhu Xie ◽

Wei Guo Wang ◽

Xin Wei ◽

Wei Hu ◽

Qing Lei Ren ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Modal Analysis ◽

Natural Frequencies ◽

Resonance Region ◽

Middle Part ◽

The Finite Element Method ◽

Drive Axle ◽

Drive Axle Housing ◽

Element Method

A finite element method (FEM) is used to make the modal analysis of the drive axle housing, the first ten natural frequencies and modal shapes are obtained. The parameter identification method is applied to obtain the experimental modes. There is a great agreement with the calculating modes and the experimental ones, which proves that the finite element method is rational. According to the theoretical analysis, the main deformations are bending and torsion at both ends of the drive axle housing and the deformation of the middle part is relatively high. The natural frequencies are at middle and high frequencies which are close to the mesh frequencies of the drive axle gears. Therefore increasing the thickness and redesigning of stiffened palates are applied to avoid the resonance region effectively.

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Component Mode Synthesis Method Applied to Acoustic Resonators in Ducts for Structural Vibration Analysis

10.20855/ijav.2020.25.41638 ◽

2020 ◽

Vol 25 (4) ◽

pp. 498-503

Author(s):

Jose Manuel Bautista Ordóñez ◽

Maria Alzira de Araújo Nunes

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Modal Analysis ◽

Natural Frequencies ◽

Component Mode Synthesis ◽

Structural Vibration ◽

Structural Systems ◽

Vibration Modes ◽

The Finite Element Method ◽

Element Method

Tubular structural systems appear in many industrial applications, such as heating, ventilation, and air conditioning systems, which are responsible for making any enclosed environment remain within a temperature, humidity, and cleanliness range. This kind of system has its applications in the internal environmental comfort of industrial spaces, buildings, and vehicles. Several of these spaces have industrial processes that generate high sound frequencies and mechanical vibrations that need to be adequately controlled to meet both environmental and health norms. With the intention to analyze the structural vibration of tubular systems, the modal analysis technique is a classical methodology for the extraction of natural frequencies and vibration modes. Among the various techniques of modal analysis, numerical methodologies such as the finite element method, and also analytical methodologies such as the Component Mode Synthesis (CMS) can be found. CMS is one of the leading modeling tools for complex systems that are applied to large systems. The method uses a modal superset and consists of separately modeling individual components of a structure and coupling them into a single system. The objective of this work is to demonstrate the application of the CMS technique through the estimation of natural frequencies and vibration modes in a simplified tubular structural system formed by two substructures, using MATLAB and ANSYS. The validation of the results was done through numerical modeling using the finite element method using and ANSYS software. The results obtained were satisfactory, thus demonstrating the feasibility of applying the CMS technique to an analysis of structural vibration in tubular structural systems.

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Theoretical and Numerical Modal Analysis for Nuclear Coolant Pump and its Scaled Rotor System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.985 ◽

2010 ◽

Vol 44-47 ◽

pp. 985-991

Author(s):

Chun Ming Gong ◽

Hong Shen ◽

Zheng Qiang Yao

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Modal Analysis ◽

Theoretical Method ◽

Rotor System ◽

The Finite Element Method ◽

Coolant Pump ◽

Similarity Law ◽

Nuclear Coolant ◽

Element Method

This paper presents a theoretical transfer matrix method for the modal analysis of nuclear coolant pump, and base on certain similarity law, a scaled rotor system is designed so as to simulate the characteristics of the real nuclear coolant pump, especially the vibration characteristics. Following that, the finite element method is used to verify the accuracy of the above theoretical method since there are a few simplifications in theoretical method compared with the finite element method. Finally the natural vibration frequencies and vibration modes of both nuclear coolant pump and the designed scaled rotor system are attained, which have high similarity with each other, and which confirm the accuracy of the two methods that are used in this article.

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