scholarly journals MAXIMUM DISPLACEMENT RESPONSE OF 1 DOF SYSTEM SUBJECTED TO 1 CYCLE SINE WAVE

2002 ◽  
Vol 8 (16) ◽  
pp. 63-66 ◽  
Author(s):  
Koji YAMADA
Keyword(s):  
Sine Wave ◽  
Maximum Displacement ◽  
Displacement Response

Dynamic Response Analysis for the Solar-Powered Aircraft Composite Wing Panel with Viscoelastic Damping Layer

2011 ◽  
Vol 105-107 ◽  
pp. 491-494
Author(s):  
Tie Jun Liu ◽  
Yong Zhang ◽  
Gang Li ◽  
Feng Hui Wang
Keyword(s):  
Dynamic Response ◽  
Vibration Isolation ◽  
Viscoelastic Damping ◽  
Response Analysis ◽  
Aircraft Wing ◽  
Maximum Displacement ◽  
Displacement Response ◽  
Stiffened Structures ◽  
Solar Powered ◽  
Wing Panel

In design of solar powered aircraft wing panel, vibration properties of wing panel should be considered, especially for the peak value of dynamic response. In this research, a viscoelastic damping layer is built for vibration isolation, wing panel finite element models of stiffened and no-stiffened structures base on fiber-reinforced laminates with damping layer in the middle are built. Natural frequency and displacement response are analyzed with different thickness of damping layer and structures. Result shows natural frequencies decrease as thickness increased, and that of laminates are lower than stiffened structure. The maximum displacement response value decreased when thickness increased and that of laminates is higher than structured with stiffer. The presented work is helpful for type selection and designing of solar powered aircraft wing panel.

The Optimization of Damping of Four Configurations of a Vibrating Uniform Beam

1963 ◽  
Vol 85 (3) ◽  
pp. 259-264 ◽  
Author(s):  
Alex Henney ◽  
J. P. Raney
Keyword(s):  
Digital Computer ◽  
Empirical Formula ◽  
Response Curves ◽  
Maximum Displacement ◽  
Single Degree Of Freedom ◽  
Displacement Response ◽  
Single Degree ◽  
Uniform Beam ◽  
Computer Response ◽  
Analytical Expressions

Approximate analytical expressions for optimum damping for four configurations of forcing and damping a uniform beam were evaluated and the displacement responses for optimum damping values obtained from these expressions were calculated by a digital computer. It was found that the responses were accurately optimized. The sensitivity of maximum displacement response to deviation from optimum damping was investigated, but no analytical expressions relating change to deviation were obtained. An empirical formula, based upon consideration of the response of the beam as a single-degree-of-freedom system, was shown to be a good approximation of results obtained from the computer response curves. The four configurations investigated were relatively insensitive to changes in damping from optimum.

Analysis of Wind-Induced Vibration Control of Long-Span Space Structure

2011 ◽  
Vol 255-260 ◽  
pp. 1204-1208
Author(s):  
Zhi Qiang Zhang ◽  
Yan Chen ◽  
Guan Xing Su ◽  
Xing Gang Zhu
Keyword(s):  
Wind Tunnel Test ◽  
Time History ◽  
Space Structure ◽  
Wind Pressure ◽  
Filter Method ◽  
Maximum Displacement ◽  
Displacement Response ◽  
Long Span ◽  
History Of ◽  
Wind Induced Vibration

Based on improved linear regression filter method presented by Iwatani and wind tunnel test data, the program simulated 3-D time history of fluctuating wind pressure of Fuzhou Strait International Conference and Exhibition Center considering spatial correlation of wind loads, which is consistent with the object power spectrum .The simulation result is used in nodes of the structure to analyze response of wind-induced vibration. Analytical results show it has the maximum displacement response in 0° wind direction .Due to the installation of TMD, node displacement response of roof truss is reduced from 44.14mm to 33.16mm, with best reduction 26.67%.

scholarly journals Modeling, Vibration Analysis and Fabrication of Micropumps Based on Piezoelectric Transducers

2020 ◽  
Vol 25 (3) ◽  
pp. 383-391
Author(s):  
Yanfang Guan ◽  
Xiangxin Meng ◽  
Yansheng Liu ◽  
Mingyang Bai ◽  
Fengqian Xu
Keyword(s):  
Flow Rate ◽  
Forced Vibration ◽  
Sine Wave ◽  
Piezoelectric Transducers ◽  
Driving Voltage ◽  
Driving Frequency ◽  
External Diameter ◽  
Maximum Displacement ◽  
Wave Signal ◽  
Before And After

The parametric and vibrational characteristics of PZTs (Piezoelectric Transducers) with different diameters before and after coupling are discussed by finite element analysis. It is shown that the vibration stability of the piezoelectric transducer decreases with increasing driving frequency. The PZT's variation of maximum displacement with frequency shows the same trend for different driving conditions according to vibration measurement under conditions of both free and forced vibration (before and after sealing with the pump body). The maximum displacement under forced vibration is less than that under free vibration. The maximum displacement is inversely proportional to the diameter of the transducer and directly proportional to the driving voltage under both free and forced vibration. Micropumps with diffuser/nozzle microvalves are designed and fabricated with different external diameters of the PZTs. Finally, the flow rate and pressure of the micropumps are measured, which are consistent with the vibrational results. Moreover, the maximum displacement is larger under a square-wave driving signal, followed by a sine-wave signal, and then a triangle-wave signal. For a PZT with an external diameter of $12$ mm, the maximum flow rate and pressure value are $150$~$upmu$l/min and $346$ Pa, respectively, under sine-wave driving at $100$ Vpp driving voltage.

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