scholarly journals Analysis of Natural Frequency Sensitivity of Truck Body

2016 ◽  
Author(s):  
Xue Liu ◽  
Qing Shao ◽  
Tao Xu ◽  
Guikai Guo
Keyword(s):  
Natural Frequency ◽  
Frequency Sensitivity

Study on Dynamic Characteristics and Parameter Sensitivity of Three Spans Prestressed Continuous Beam

2013 ◽  
Vol 351-352 ◽  
pp. 386-391
Author(s):  
Lu Ning Shi ◽  
Hao Xiang He ◽  
Wei Ming Yan ◽  
Yan Jiang Chen ◽  
Da Zhang
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Frequency Equation ◽  
Dynamic Parameters ◽  
Continuous Beam ◽  
Analytical Expression ◽  
Beam Dynamic ◽  
Frequency Sensitivity ◽  
The Impact ◽  
Good Agreement

Established the three spans prestressed continuous beam dynamic equation, obtained analytical expression of frequency equation. To solve the frequency equation for natural frequency, and compared with the finite element numerical analysis results, the frequency both with analytical expression and with finite element are in good agreement. The formula can be obtained accurately the dynamic parameters of three spans prestressed continuous beam such as frequency. At the same time, the paper also studied the natural frequency sensitivity analysis of three spans prestressed continuous beam, and focuses on the impact on the frequency with effective prestress and prestressed eccentricity.

Eigensensitivity of Planetary Gear Free Vibration Properties

1999 ◽  
Author(s):  
Jian Lin ◽  
Robert G. Parker
Keyword(s):  
Kinetic Energy ◽  
Free Vibration ◽  
Natural Frequency ◽  
Vibration Mode ◽  
Planetary Gear ◽  
Planetary Gears ◽  
System Parameters ◽  
Frequency Sensitivity ◽  
Vibration Properties ◽  
Inertia Parameters

Abstract The natural frequency and vibration mode sensitivities to system parameters are rigorously investigated for both tuned and mistimed planetary gears. Parameters under consideration include support and mesh stiffnesses, component masses, and moments of inertia. Using the well-defined vibration mode properties of tuned (cyclically symmetric) planetary gears [1], the eigensensitivities are calculated and expressed in simple, exact formulae. These formulae connect natural frequency sensitivity with the modal strain or kinetic energy and provide efficient means to determine the sensitivity to all stiffness and inertia parameters by inspection of the modal energy distribution. While the terminology of planetary gears is used throughout, the results apply for general epicyclic gears.

Natural Frequency Sensitivity Analysis with Respect to Lumped Mass Location

AIAA Journal ◽  
10.2514/2.812 ◽  
1999 ◽  
Vol 37 (8) ◽  
pp. 928-932 ◽  
Author(s):  
D. C. D. Oguamanam ◽  
Z. S. Liu ◽  
J. S. Hansen
Keyword(s):  
Sensitivity Analysis ◽  
Natural Frequency ◽  
Lumped Mass ◽  
Frequency Sensitivity

Sensitivity Analysis of Natural Frequency to Structural Parameters of Helical Gear Shaft for Wind Turbine Gearbox

2011 ◽  
Vol 86 ◽  
pp. 380-383 ◽  
Author(s):  
Jun Gang Wang ◽  
Yong Wang ◽  
Yan Tao An ◽  
Qi Lin Huang
Keyword(s):  
Sensitivity Analysis ◽  
Natural Frequency ◽  
Natural Frequencies ◽  
Structural Parameters ◽  
Helical Gear ◽  
Research Subject ◽  
Wind Turbine Gearbox ◽  
Frequency Sensitivity ◽  
Helical Angle ◽  
The Relationship

This paper takes a helical gear shaft as research subject and discusses the main structural parameters to see how it would affect natural frequency sensitivity. The parametrical model of helical gear shaft is created by using software PROE3.0. The natural frequencies and vibration shapes are calculated by the modal analysis. The relationship between the structural parameters and the natural frequency sensitivity can be obtained by means of ANSYS. The result shows that the structural parameters can affect the natural frequency sensitivity. The variation in low order natural frequency is similar to that in high order natural frequency. The effect of module on the natural frequency sensitivity is more remarkable comparing with pressure angle, modification coefficient and helical angle. Selecting structural parameters reasonably may reduce vibration and noise of the helical gear shaft effectively.

scholarly journals Assessment of bridge natural frequency as an indicator of scour using centrifuge modelling

2020 ◽  
Vol 10 (5) ◽  
pp. 861-881
Author(s):  
Kasun D. Kariyawasam ◽  
Campbell R. Middleton ◽  
Gopal Madabhushi ◽  
Stuart K. Haigh ◽  
James P. Talbot
Keyword(s):  
Natural Frequency ◽  
Structural Damage ◽  
Full Scale ◽  
Shallow Foundation ◽  
Scale Model ◽  
Deep Foundation ◽  
Reliable Technique ◽  
Centrifuge Testing ◽  
Frequency Sensitivity ◽  
Bridge Failure

Abstract One of the most prevalent causes of bridge failure around the world is “scour”—the gradual erosion of soil around a bridge foundation due to fast-flowing water. A reliable technique for monitoring scour would help bridge engineers take timely countermeasures to safeguard against failure. Although vibration-based techniques for monitoring structural damage have had limited success, primarily due to insufficient sensitivity, these have tended to focus on the detection of local damage. High natural frequency sensitivity has recently been reported for scour damage. Previous experiments to investigate this have been limited as a result of the cost of full-scale testing and the fact that scaled-down soil-structure models tested outside a centrifuge do not adequately simulate full-scale behaviour. This paper describes the development of what is believed to be the first-ever centrifuge-testing programme to establish the sensitivity of bridge natural frequency to scour. A 1/60 scale model of a two-span integral bridge with 15 m spans was tested at varying levels of scour. For the fundamental mode of vibration, these tests found up to a 40% variation in natural frequency for 30% loss of embedment. Models of three other types of foundation, which represent a shallow pad foundation, a deep pile bent and a deep monopile, were also tested in the centrifuge at different scour levels. The shallow foundation model showed lower frequency sensitivity to scour than the deep foundation models. Another important finding is that the frequency sensitivity to “global scour” is slightly higher than the sensitivity to “local scour”, for all foundation types. The level of frequency sensitivity (3.1–44% per scour depth equivalent to 30% of embedment of scour) detected in this experiment demonstrates the potential for using natural frequency as an indicator of both local and global scour of bridges, particularly those with deep foundations.

scholarly journals Natural frequency sensitivity and influence analysis of TBM cutterhead system

2019 ◽  
Vol 21 (6) ◽  
pp. 1710-1723
Author(s):  
Jingxiu Ling ◽  
Xin Tong ◽  
Changsheng Guo ◽  
Zhanfu Li
Keyword(s):  
Natural Frequency ◽  
Influence Analysis ◽  
Frequency Sensitivity

Natural frequency sensitivity analysis with respect to lumped mass location

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 928-932 ◽  
Author(s):  
D. C. D. Oguamanam ◽  
Z. S. Liu ◽  
J. S. Hansen
Keyword(s):  
Sensitivity Analysis ◽  
Natural Frequency ◽  
Lumped Mass ◽  
Frequency Sensitivity

Optimal Design of a Scroll Case with Natural Frequency Constraints

2011 ◽  
Vol 94-96 ◽  
pp. 1719-1722
Author(s):  
Xin Li Bai ◽  
Gui Rong Liu ◽  
Song An Zhang
Keyword(s):  
Optimal Design ◽  
Natural Frequency ◽  
Analytical Method ◽  
Mass Matrix ◽  
Program System ◽  
Structural Dynamic ◽  
Frequency Constraints ◽  
Frequency Sensitivity ◽  
Scroll Case ◽  
Calculation Results

In this paper, sensitivity formula with analytical method is derived for calculating structural natural frequency, and the partial derivative of plate element stiffness matrix and mass matrix with respect to design variables are gained respectively. Computer programs for computing frequency sensitivity with analytical method are developed. And combining it with large finite element structural analysis software ADINA, the optimal design software based on genetic algorithms, a structural dynamic optimization program system is constituted for computing structural natural frequency sensitivity with analytical method. Finally, the program system is applied to the optimal design of a turbine scroll case of a hydropower station (taking into account the natural frequency constraints). Calculation results show that analytical method presented in the paper is of higher computational precision, good stability, convenient to use, and can be popularized. Calculation results obtained the approval of client and used in real engineering.

Influence of the distribution of the shear walls on the seismic response of the buildings

2020 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
El Mehdi Echebba ◽  
Hasnae Boubel ◽  
Oumnia Elmrabet ◽  
Mohamed Rougui
Keyword(s):  
Structural Analysis ◽  
Seismic Response ◽  
Natural Frequency ◽  
Structural Design ◽  
Structural Response ◽  
Shear Walls ◽  
Structural Elements ◽  
Analysis Software ◽  
Ansys Apdl ◽  
The Impact

Abstract In this paper, an evaluation was tried for the impact of structural design on structural response. Several situations are foreseen as the possibilities of changing the distribution of the structural elements (sails, columns, etc.), the width of the structure and the number of floors indicates the adapted type of bracing for a given structure by referring only to its Geometric dimensions. This was done by studying the effect of the technical design of the building on the natural frequency of the structure with the study of the influence of the distribution of the structural elements on the seismic response of the building, taking into account of the requirements of the Moroccan earthquake regulations 2000/2011 and using the ANSYS APDL and Robot Structural Analysis software.

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