Structural Dynamic Test-Analysis Correlation

2014 ◽  
pp. 37-51
Author(s):  
Robert N. Coppolino
Keyword(s):  
Dynamic Test ◽  
Test Analysis ◽  
Structural Dynamic

scholarly journals Dynamic test/analysis correlation using reduced analytical models

1992 ◽  
Author(s):  
PAUL MCGOWAN ◽  
A. ANGELUCCI ◽  
MEHZAD JAVEED
Keyword(s):  
Dynamic Test ◽  
Analytical Models ◽  
Test Analysis

Aerodynamic Damping Measurements in a Transonic Compressor

1982 ◽  
Author(s):  
E. F. Crawley
Keyword(s):  
Direct Measurement ◽  
Equations Of Motion ◽  
Dynamic Equations ◽  
Test Facility ◽  
Disk System ◽  
Test Analysis ◽  
Structural Dynamic ◽  
Aerodynamic Damping ◽  
Transonic Compressor ◽  
Reduced Frequency

A method has been developed and demonstrated for the direct measurement of aerodynamic damping in a transonic compressor. The method is based on the inverse solution of the structural dynamic equations of motion of the blade-disk system. The equations are solved inversely to determine the forces acting on the system. If the structural dynamic equations are transformed to multiblade or modal coordinates, the damping can be measured for blade-disk modes, and related to a reduced frequency and interblade phase angle. This method of damping determination was demonstrated using a specially instrumented version of the MIT Transonic Compressor run in the MIT Blowdown Compressor Test Facility. No regions of aeroelastic instability were found. In runs at the operating point, the rotor was aerodynamically excited by a controlled two-per-revolution fixed upstream disturbance. The disturbance was sharply terminated midway through the test. Analysis of the data in terms of multiblade modes led to a direct measurement of aerodynamic damping for three interblade phase angles.

Research on Mechanical Structure Optimization Oriented to Dynamic Characteristics

2010 ◽  
Vol 33 ◽  
pp. 533-538
Author(s):  
Miao Hu ◽  
Tai Yong Wang ◽  
Shuai Yang ◽  
Zhi Feng Qiao ◽  
Dian Peng Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Performance Optimization ◽  
Dynamic Performance ◽  
Fem Simulation ◽  
Dynamic Test ◽  
Structure Optimization ◽  
Test Analysis ◽  
Basic Principles ◽  
Dynamic Design

Basic principles of dynamic design were proposed for the characteristics of machine dynamic performance. Take some curved-tooth bevel gear generator as research object. Its dynamic performance was analyzed and structure was optimized through theoretical analysis, finite element method (FEM) simulation and dynamic test analysis. Results show that these principles are suitable for dynamic performance optimization and design of machine tool.

Pseudo-Dynamic Test Analysis of Plane Steel Frame with Semi-Rigid Connection

2014 ◽  
Vol 513-517 ◽  
pp. 210-213
Author(s):  
Xin Wu Wang ◽  
Chang Jiao Hu
Keyword(s):  
Dynamic Test ◽  
Steel Structure ◽  
Steel Frame ◽  
Experimental Basis ◽  
Acceleration Response ◽  
Test Analysis ◽  
Hysteretic Performance ◽  
Steel Connection ◽  
Rigid Connection ◽  
Plane Steel Frame

In this paper, the pseudo-dynamic test of the plane steel frame with slit T steel connection was carried out.According to the results of the experiment,we focused on the analysis of strain,the acceleration response,displacement response and hysteretic performance of the steel frame to investigate the seismic performance of the steel frame,so as to provide experimental basis for improving the design of steel structure in our country.

scholarly journals Structural Dynamic Improvement for Petal-Type Deployable Solid-Surface Reflector Based on Numerical Parameter Study

2020 ◽  
Vol 10 (18) ◽  
pp. 6560
Author(s):  
He Huang ◽  
Qiang Cheng ◽  
Lei Zheng
Keyword(s):  
Solid Surface ◽  
Dynamic Properties ◽  
Dynamic Performance ◽  
Dynamic Test ◽  
Mode Shapes ◽  
Design Parameters ◽  
Prototype Model ◽  
Parameter Study ◽  
Structural Dynamic ◽  
Replacement Method

Petal-type Deployable Solid-surface Reflector (PDSR) is a kind of important structure widely applied in deployable reflector antennas in aerospace engineering. The dynamic properties of this reflector structure in deployed state are significant to the reflector accuracy for antennas. However, the study of the dynamic evaluation of deployable structure with revolute joints is difficult and seldom concerned by researchers. In order to study dynamic properties of the PDSR, the Cable Replacement Method (CRM) was utilized to equivalently simulate the nonlinear structural stiffness of the revolute joint for numerical analyses. The Finite Element Model (FEM) of this reflector structure was established by commercial software ANSYS (ANSYS Inc., Canonsburg, PA, USA) and verified by the theoretical analysis and dynamic test of actual prototype model. The natural frequencies and mode shapes of deployed reflector were computed to study the influence of drag spring design parameters as stiffness, pre-tensioned force, and distance of two adjacent linkage butts. Finally, the analysis results were concluded that the drag springs between two adjacent petals can essentially improve the dynamic performance of reflector structure in deployed state. It can be a useful technical system for future engineering applications of PDSR antennas.

Study on Dynamics Analysis and Application of Vibration Modal Testing of Suspension Cable Structure Based on MEMS Sensor

2013 ◽  
Vol 448-453 ◽  
pp. 2149-2152
Author(s):  
Yao En Yang ◽  
Qing Min Wang
Keyword(s):  
Finite Element ◽  
Vibration Mode ◽  
Dynamic Test ◽  
Element Model ◽  
Test System ◽  
Modal Testing ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Mems Sensor ◽  
Inherent Frequency

The large span suspension structure is easy to generate larger vibration due to its smaller stiffness. For this problem, a finite element modal analysis method that considers the effect of initial pre-stress is proposed. The finite element model of the structure is established by using Link10 unit of the finite element analysis software ANSYS. Then the first four order natural frequency and vibration mode under different initial pre-stress is solved by the subspace iterative method. And the experimental test system based on MEMS sensor is designed to analyze the layout of test points and exciting vibration mode of the structure. The test system measures the inherent frequency and the first two order vibration mode under the action of different pre-stress. The results show that the numerical analysis results are basically consistent with the experimental results and the inherent frequency of the structure distributes in the plexus intensive form. And the inherent frequency of the structure is related to the pre-stress. The bigger the stiffness of the structure, the greater the inherent frequency is. It proves that the theoretical analysis results are correct and the experiment test system can be used in the structural dynamic test.

Finite Element Simulation and Dynamic Test of the Bridge Structure

2011 ◽  
Vol 52-54 ◽  
pp. 2191-2196
Author(s):  
Yu Qing Liu ◽  
Yan Xiang Wu ◽  
Hai Bo Huo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Dynamic Test ◽  
Element Model ◽  
Scientific Basis ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this paper, we established a bridge three-dimensional finite element model for the structural dynamic analysis according to the geometry and material properties of a bridge Li Gong Yi Qiao at Wuhan University of Technology. On the other hand, we tested the dynamic characteristics of the bridge under environmental excitation by means of bridge sensors arranged at different points. The modal parameters of the bridge were identified through fitting the admittance circle. The comparison between the measured results and the theoretical studies has shown that the low-order vibration frequency and mode obtained from finite element analysis generally consistent with those from test. The finite element model provides a scientific basis for condition monitoring of the bridge in actual operations.

Dynamic Load Test Analysis for Continuous Steel Bridge

2013 ◽  
Vol 275-277 ◽  
pp. 1078-1081
Author(s):  
Min Jing Ma
Keyword(s):  
Mechanical Performance ◽  
Dynamic Performance ◽  
Dynamic Test ◽  
Load Test ◽  
Continuous Steel ◽  
Seismic Action ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Test Analysis ◽  
Mechanics Model

Bridge dynamics is an important topic in the development of the modern Bridges. It not only can reflect the mechanical performance of the bridge structure under the action of vehicle load, but also reveals system influences on the bridge structure under seismic action. But in order to supplement the shortage of the pure theoretical mechanics model, we need to do some tests to improve the research that is also the most reliable method. Illustrated by the example of a viaduct (continuous steel box girder-bridge) in Taiyuan, the testing span is loaded and tested. We analyze the structure using the bridge calculation common software Midas. The existing Bridge in dynamic test loads is analyzed to research that if their vibration characteristics and dynamic response and dynamic performance can meet the requirements of normal use.

Pseudo-Dynamic Test Analysis of Rigid Pile Composite Foundation

2012 ◽  
Vol 594-597 ◽  
pp. 561-564
Author(s):  
Gui Lin Sheng ◽  
De Hui Liu ◽  
Peng Bao
Keyword(s):  
Similarity Theory ◽  
Dynamic Test ◽  
Pile Group ◽  
Composite Foundation ◽  
Test Method ◽  
Displacement Sensor ◽  
Group Model ◽  
Test Analysis ◽  
Rigid Pile ◽  
Rigid Pile Composite Foundation

According to the similarity theory, this paper established a geometric similarity 1:10 and 3 × 3 rigid pile composite foundation pile group model. Pile strain , cushion deformation and flask displacement were obtained through pasting resistance strain gauges in pile, embedding strain gauge in cushion, connecting to displacement sensor at out of flask, etc., basing on pseudo-dynamic test method. These date were analyzed and studied, and then can conclude the response pattern under earthquake action on rigid pile composite foundation, which provide a basis for application of rigid pile composite foundation in practical engineering.

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