GEOMETRIC NONLINEAR EFFECT OF A TYPICAL CFRP PAYLOAD FAIRING ON DYNAMIC DISPLACEMENT RESPONSE

2001 ◽  
Vol 245 (3) ◽  
pp. 562-570 ◽  
Author(s):  
V. RAMAMURTI ◽  
S. RAJARAJAN ◽  
G.V. RAO
Keyword(s):  
Nonlinear Effect ◽  
Dynamic Displacement ◽  
Displacement Response ◽  
Geometric Nonlinear ◽  
Payload Fairing

Geometric Non-Linear Influence of a Payload Fairing on Dynamic Displacement Response

2000 ◽  
Author(s):  
V. Ramamurti ◽  
S. Rajarajan ◽  
G. V. Rao
Keyword(s):  
Shell Element ◽  
Superposition Method ◽  
Time Step ◽  
Dynamic Displacement ◽  
Displacement Response ◽  
Mode Superposition Method ◽  
Plate And Shell ◽  
Non Linear ◽  
Deformed State ◽  
Payload Fairing

Abstract Finite element method using three noded plate and shell element and 3D beam element in conjunction with mode superposition method is used for studying the large dynamic displacement response of a typical payload fairing due to separation impulse. Incremental technique is used for solving the geometric non-linear problem. Linear formulations are assumed and a step-by-step analysis is performed on the deformed state of each previous time step. The geometry is updated and the stiffness matrix recomputed after every finite time step and the eigenvalue analysis repeated.

Geometric Nonlinear Effect on Biaxial Bending Strength of Thin Silicon Die in the PoEF Test

2020 ◽  
Vol 20 (2) ◽  
pp. 442-451
Author(s):  
Ming-Yi Tsai ◽  
Jia-Hao Yeh ◽  
Pu-Shan Huang ◽  
D. L. Chen ◽  
M. K. Shih ◽  
...  
Keyword(s):  
Nonlinear Effect ◽  
Bending Strength ◽  
Biaxial Bending ◽  
Geometric Nonlinear ◽  
Thin Silicon

scholarly journals Analytical study on the dynamic displacement response of a curved track subjected to moving loads

2013 ◽  
Vol 14 (12) ◽  
pp. 867-879 ◽  
Author(s):  
Ke-fei Li ◽  
Wei-ning Liu ◽  
Valeri Markine ◽  
Zhi-wei Han
Keyword(s):  
Analytical Study ◽  
Moving Loads ◽  
Dynamic Displacement ◽  
Displacement Response ◽  
Curved Track

Uncertain Response Analysis of Fractionally-Damped Beams Based on Interval Process Model

2021 ◽  
Author(s):  
C. K. Shen ◽  
D. Mi ◽  
J. W. Li
Keyword(s):  
Stochastic Process ◽  
Vibration Analysis ◽  
Process Model ◽  
Response Analysis ◽  
Time Interval ◽  
Superposition Method ◽  
Middle Point ◽  
Dynamic Displacement ◽  
Displacement Response ◽  
The Laplace Transform

In the uncertain vibration analysis of fractionally-damped beams whose damping characteristic is described using fractional derivative model, the uncertain excitation is usually modeled as a stochastic process. However, it is often difficult to obtain sufficient samples of the excitation to establish a precise probability distribution function for the stochastic process model in practical engineering problems. Hence, in this paper, a nonrandom vibration analysis method for fractionally-damped beams is proposed to obtain the dynamic displacement response bounds of the beams under the uncertain excitation. Specifically, the uncertain excitation applied to the fractionally-damped beam is treated as a spatial-time interval field, so that the dynamic displacement response of the beam is also a space-time interval field. The middle point function and the radius function of the displacement response of the fractionally-damped beam can be derived based on the modal superposition method and the Laplace transform, through which the bound functions of the dynamic displacement response can be obtained. In addition, several numerical examples are given to demonstrate the effectiveness of the proposed method.

A novel method for rapidly calculating explosion dynamic displacement response of reticulated shell structure based on influence surfaces

2019 ◽  
Vol 23 (6) ◽  
pp. 1098-1113
Author(s):  
Xin Chen ◽  
Xuanneng Gao ◽  
Xiang Lin ◽  
Jingliang Liu ◽  
Lihui Le
Keyword(s):  
Shell Structure ◽  
Dynamic Responses ◽  
Vibration Period ◽  
Dynamic Displacement ◽  
Symmetrical Structure ◽  
Displacement Response ◽  
Influence Line ◽  
Surface Method ◽  
Novel Method ◽  
Reticulated Shell Structure

In order to analyse the mechanical behaviour of a reticulated shell structure under explosive load, a novel method was proposed to calculate the dynamic displacement response of the cylindrical reticulated shell structure by using the influence surface in this article. First, the theory of the dynamic influence line was developed and the consistency between the dynamic influence lines and the static ones was verified. Then, based on the theory of the dynamic influence line and for the simplified calculation of dynamic responses, the dynamic influence lines of a simply supported beam were simplified as the static ones multiplied by the dynamic amplification factor β. And then the explosion dynamic responses of the beam could be fast calculated using the influence lines. The extended application of the above method to single-layer cylindrical reticulated shell was the influence surface method. The results of numerical examples showed that the nodal displacements of the structure obtained by using the influence surface method agreed well with those obtained by using ANSYS/LS-DYNA. The research results also indicated that the influence surface method was applicable to the node displacement calculation of the structure under three different conditions, including the centre node of the symmetrical structure, the arbitrary nodes (excluding those near the supports) of symmetrical structure under symmetrical loads and the arbitrary nodes of arbitrary structures in which the load holding time is much longer than the natural vibration period of structure. The proposed approach could reduce the computation cost for analysing the explosion dynamic response of the reticulated shell structure, thereby providing a more effective method for the anti-explosion design of reticulated shell structures.

scholarly journals Research on Seismic Dynamic Response Characteristics of Weak Surrounding Rock Slope With Double-Arch Tunnel

2021 ◽  
Author(s):  
Xueliang Jiang ◽  
Yonghui Qian ◽  
Jiqi Zhang ◽  
Yong Liu ◽  
RiWe Deng ◽  
...  
Keyword(s):  
Seismic Wave ◽  
Amplification Factor ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Dynamic Displacement ◽  
Displacement Response ◽  
Response Characteristics ◽  
Acceleration Amplification ◽  
Dynamic Response Characteristics ◽  
Peak Value

Abstract Through the shaking table test, Wenchuan wave (WC) was used as the excitation wave of the shaking table test. The vibration was excited in three directions: horizontal (x), vertical (z), and horizontal and vertical (xz) and the dynamic response characteristics of rock slopes was studied. The results show:(1) The acceleration amplification factor of each measuring point of the slope shows a nonlinear increasing trend with the increase of the slope height.The slope changes the frequency spectrum of the loaded seismic wave.The slope has a filtering effect on the high frequency band of the seismic wave.(2) Under the unidirectional cyclic loading of Wenchuan wave, the slope acceleration amplification factor increases with the increase of the peak value of the seismic wave. Under the bi-directional excitation of Wenchuan wave, the slope acceleration amplification coefficient generally decreases with the increase of the peak value of the seismic wave.The slope acceleration amplification factor presents the characteristics of first increasing and then decreasing with the increase of the relative height of the slope.(3) The dynamic displacement response characteristics of the tunnel slope with double-arch tunnel are mainly affected by the seismic wave in the same direction and the peak value of the dynamic displacement response increases with the increase of the seismic wave peak value.(4) The peak dynamic displacement response of the double-arch tunnel slope shows a non-linear change trend with the increase of slope height. The dynamic displacement peak growth rate is slower below the rock interface and the dynamic displacement peak increases rapidly above the interface and Maximum displacement occurred at the top of the slope.

Inversion algorithm for the whole prototype dynamic displacement field of a high arch dam based on limited measuring points

2016 ◽  
Vol 23 (20) ◽  
pp. 3431-3447 ◽  
Author(s):  
Huokun Li ◽  
Yujie Wang ◽  
Bowen Wei
Keyword(s):  
Displacement Field ◽  
Vibration Response ◽  
Arch Dam ◽  
Inversion Algorithm ◽  
Flow Induced Vibration ◽  
High Arch Dam ◽  
Dynamic Displacement ◽  
Displacement Response ◽  
Load Spectra ◽  
Flood Discharge

The mean square deviation (MSD) of an arch dam dynamic displacement response during a flood discharge period is an important indicator used to evaluate the vibration intensity. The whole distribution of the MSD of the dynamic displacement response reflects the whole dynamic displacement field. Inversion of the whole dynamic displacement field of the arch dam based on limited measuring points is of significance. In this study, the Ertan arch dam was used to propose an inversion algorithm for the whole prototype dynamic displacement field of the arch dam. First, inversion theory of flow-induced vibration response for the arch dam is introduced. Second, the arch dam prototype vibration test under flood discharge excitation is conducted to determine the dynamic displacement response of limited measuring points. Third, the full-scale finite element model of the Ertan arch dam is set up to conduct modal analysis, and the first nine modes are cutoff to extract the modal parameters for the inversion of equivalent excitation source load spectra. Finally, the whole dynamic displacement field of the arch dam is calculated by flow-induced vibration response positive analysis based on the equivalent excitation load spectra. Inversion results show that the whole arch dam dynamic displacement field is obtained through only seven dynamic displacement response measuring points arranged on the crest of the dam. Simultaneously, the inversion and measured values are in good agreement. This method provides a novel technique to reasonably evaluate the high arch dam during the flood discharge period.

Analysis of the Geometric Nonlinear Effect on the Mechanical Behavior of Pseudoelastic Shape Memory Alloy Helical Springs

2015 ◽  
Author(s):  
Marcelo Amorim Savi ◽  
Mauricio S. Garcia ◽  
Pedro Manuel Calas Lopes Pacheco ◽  
Ricardo Alexandre Amar de Aguiar ◽  
Luís Felipe Guimarães de Souza ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Mechanical Behavior ◽  
Shape Memory ◽  
Nonlinear Effect ◽  
Helical Springs ◽  
Geometric Nonlinear
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