scholarly journals JuliaFEM beam element implementation

2019 ◽  
Vol 52 (3) ◽  
pp. 160-176
Author(s):  
Ville Eino Matias Jämsä ◽  
Jukka Aho ◽  
Teemu Kuivaniemi ◽  
Niclas Liljenfeldt ◽  
Tero Frondelius
Keyword(s):  
Natural Frequency ◽  
Beam Element ◽  
Race Car ◽  
Beam Elements ◽  
Frequency Calculation ◽  
Commercial Program ◽  
Calculation Results ◽  
Natural Frequency Calculation

This article describes implementations of beam elements to JuliaFEM. The theory is briefly introduced, and the usage of beam elements is introduced with a usage example that involves a natural frequency calculation of a formula race car frame. The calculation results were compared to results from a commercial program, and their consistency is excellent.

Dynamic Analysis on PCI Girder Bridge

2015 ◽  
Vol 747 ◽  
pp. 375-378
Author(s):  
Made Suangga ◽  
Santi
Keyword(s):  
Natural Frequency ◽  
Field Measurements ◽  
Frequency Measurement ◽  
Measurement Results ◽  
Frequency Calculation ◽  
Calculation Results ◽  
Bridge Girder ◽  
Girder Bridge ◽  
Natural Frequency Calculation ◽  
Value Measurement

To produce a quality bridge then it should be taken into account with the correct parameters and the condition of the bridge. One of the parameters is an important bridge natural frequency incurred due to dynamic loads. The purpose of this study was to conduct a comparative analysis of the natural frequency of bridge girder value measurement results in the field of natural frequency calculation results using Midas Civil programs and manuals, as well as knowing the value of the condition value of natural frequency of bridge between the actual value of natural frequency measurement results on the field and the value of natural frequency calculation program results Midas Civil. In the analysis, use design bridge gelagar PCI with a span of 21,95 meters. And bridge specifications will be made from the analysis of the natural frequency of the load calculation of structures with Midas program manual and Civil that would then be compared with the results of field measurements to find out the condition of the bridge. The natural frequency obtained from calculation manual for a bridge girder single of 5,95 Hz, and multi girder of 5,72 Hz.While value natural frequency of program midas civil for singles girder of 6,16 Hz, and for multi girder of 5,93Hz.

Numerical Examples of Variable Three-Node Beam Elements Based on Positional FEM

2014 ◽  
Vol 988 ◽  
pp. 471-474
Author(s):  
Lv Zhou Ma ◽  
Yu Qin Yan ◽  
Xun Lin Diao ◽  
Jian Liu
Keyword(s):  
Beam Element ◽  
Pure Bending ◽  
Nonlinear Fem ◽  
Euler Beam ◽  
Numerical Examples ◽  
Beam Elements ◽  
Rigid Frame ◽  
Calculation Results

Based on MATLAB platform, program TBEP (Three-node Beam Element based on Positional FEM) is compiled. Pure bending of Euler beam and cubic diamond-shaped rigid frame are calculated. The calculation results show that positional FEM uses fewer elements and gains higher calculation precision and efficiency when compared with traditional nonlinear FEM.

scholarly journals Method for determining the rational parameters of dynamic dampers of low-frequency vibrations

2019 ◽  
Vol 109 ◽  
pp. 00049
Author(s):  
Yevhen Lapshyn ◽  
Robert Molchanov ◽  
Oleksandr Khaminich
Keyword(s):  
Nonlinear System ◽  
Natural Frequency ◽  
Horizontal Plane ◽  
Nonlinear Vibrations ◽  
Low Frequency ◽  
Fundamental Tone ◽  
Natural Vibrations ◽  
Frequency Calculation ◽  
Linearized System ◽  
Natural Frequency Calculation

The problems have been considered of natural nonlinear vibrations of an absolutely rigid semiball and a semicylinder on a horizontal plane, assuming that there is no energy dissipation, sliding and tipping on foundation. To adjust the damper to a frequency close to the fundamental tone of vibrations, it is necessary to assess the natural frequency of the damper, which is determined under the assumption on smallness of the vibrations amplitude. This paper represents the comparison of the natural frequency of linearized and nonlinear system. The relative error has been estimated of the natural frequency calculation, which is caused by linearization. It is shown that the ratio of the natural frequency of the linearized system to the natural frequency of the nonlinear system does not depend on the mass and radius. This conclusion made it possible to generalize the results of particular computational solutions and to obtain a formula which takes into account the amplitude influence on the natural vibrations frequency and helps to determine the natural frequency for the initial angles to ninety degrees.

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