scholarly journals Wind Tunnel Flow Induced Vibration Characteristic Analysis

2016 ◽  
Author(s):  
Zongzheng Liu ◽  
Yan Shi ◽  
Zhenhua Chen ◽  
Xiqiang Yan ◽  
Yisheng Yang
Keyword(s):  
Wind Tunnel ◽  
Vibration Characteristic ◽  
Characteristic Analysis ◽  
Flow Induced Vibration

scholarly journals Vibration Characteristic Analysis and Simulation of High Speed Impact Penetrator

2018 ◽  
Vol 170 ◽  
pp. 022130
Author(s):  
Haitao Luo ◽  
Guangming Liu ◽  
Shipeng Chen ◽  
Wei Wang ◽  
Peng Wang
Keyword(s):  
High Speed ◽  
Vibration Characteristic ◽  
Characteristic Analysis ◽  
High Speed Impact

Vibration Characteristic Analysis of V-Shaped Electrothermal Microactuator

2012 ◽  
Vol 503 ◽  
pp. 118-121
Author(s):  
Zhen Lu Wang ◽  
Xue Jin Shen ◽  
Ling Zhou ◽  
Xiao Yang Chen
Keyword(s):  
Theoretical Calculation ◽  
Natural Frequency ◽  
Mechanical Model ◽  
Natural Frequencies ◽  
Maximum Error ◽  
Vibration Characteristic ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis

This paper is focused on the finite element analysis (FEA) and theoretical calculation of vibration characterization of V-shaped electrothermal microactuator. A vibration mechanical model about V-shaped electrothermal microactuator is presented. By having a comparison between FEA and theoretical calculation about natural frequencies of V-shaped electrothermal microactuator, the maximum error is within 0.19 %. This paper also analyzes the influences of microactuator geometric parameters on natural frequency. The length and thickness have larger effect on the natural frequency of the actuator, while the angle and width have less effect on the natural frequency.

Vibration Characteristic Analysis and Research of High Speed Dynamic Balancing Machine

2012 ◽  
Vol 529 ◽  
pp. 180-185
Author(s):  
Qing Lei Zhang ◽  
Hai Ou Shen ◽  
Bai Yu Zhao ◽  
Jing Kuan Guo
Keyword(s):  
High Speed ◽  
Natural Frequencies ◽  
Dynamic Performance ◽  
Frame Structure ◽  
Structure Model ◽  
Vibration Characteristic ◽  
Characteristic Analysis ◽  
Dynamic Balancing ◽  
Calculation Results

Dynamic performance of high speed dynamic balancing machine directly affects the accuracy and safety of dynamic balancing machine. ANSYS 12.0 was used to establish the frame structure model in this paper. The four models of dynamic balancing machine were calculated respectively. The calculation results show that additional stiffness can greatly improve the natural frequencies of dynamic balancing machine. In addition, as the base is large, we can ignore the influence on natural frequencies caused by the base.

scholarly journals Vibration Characteristic Analysis of Cracked Gear Based on Time-varying Meshing Stiffness

2020 ◽  
Vol 56 (17) ◽  
pp. 108
Author(s):  
MENG Zong ◽  
SHI Guixia ◽  
WANG Fulin ◽  
ZHAN Xuyang ◽  
FAN Fengjie
Keyword(s):  
Time Varying ◽  
Vibration Characteristic ◽  
Characteristic Analysis ◽  
Meshing Stiffness

scholarly journals FLOW INDUCED VIBRATION IN SQUARE CYLINDER OF VARIOUS ANGLES OF ATTACK

2022 ◽  
Vol 23 (1) ◽  
pp. 358-369
Author(s):  
Nur Ain Shafiza Ramzi ◽  
Kee Quen Lee ◽  
NUR AMIRA BALQIS MOHD ZAINURI ◽  
HOOI SIANG KANG ◽  
NOR’AZIZI OTHMAN ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Engineering ◽  
Kuala Lumpur ◽  
Velocity Range ◽  
Square Cylinder ◽  
Flow Induced Vibration ◽  
Rigid Cylinder ◽  
Square Cylinders

An experimental study was carried out to identify the effect of angle of attack on flow-induced vibration (FIV) of square cylinders. The experiment was conducted at the Aeronautical and Wind Engineering Laboratory (AEROLAB), UTM Kuala Lumpur using a wind tunnel that was free from external wind conditions. A supporting structure was designed and fabricated to conduct this experiment. The importance of this support structure was to enable the rigid cylinder to suspend and vibrate freely upon excitation of wind speed. The results were analysed through the response of amplitude and frequency of the rigid cylinder over a velocity range of 0.5m/s to 4.0m/s. The results showed that for a square cylinder of ?=0°, vortex-induced vibration (VIV) occurred at low reduced velocity (UR) in range of 5 ? UR ? 10 and galloping occurred at higher reduced velocity which started at UR=15. A tranquil zone was found between VIV and galloping in the reduced velocity range of 10 ? UR ? 15. As for ?=22.5° and 45°, only VIV response was found at low reduced velocity in range of 4? UR ? 9. ABSTRAK: Satu kajian eksperimentasi telah dilakukan bagi mengenal pasti pengaruh sudut serangan oleh getaran cetusan-aliran (FIV) dalam silinder persegi. Eksperimen ini dijalankan di Makmal Kejuruteraan Aeronautika dan Angin (AEROLAB), UTM Kuala Lumpur dengan menggunakan terowong angin yang bebas dari pengaruh angin luar. Struktur sokongan telah direka dan difabrikasi bagi tujuan eksperimen ini. Ini penting bagi membolehkan silinder pegun tergantung dan bergetar dengan bebas semasa ujian kelajuan angin. Dapatan kajian dianalisis melalui tindak balas amplitud dan frekuensi silinder pegun pada kadar halaju 0.5m/s sehingga 4.0m/s. Hasil kajian menunjukkan bahawa bagi silinder persegi ? = 0 °, getaran pengaruh-vorteks (VIV) berlaku pada halaju rendah (UR) dalam julat 5 ? UR ? 10 dan getaran lebih teruk telah ketara berlaku pada kadar halaju berkurang iaitu bermula pada UR = 15. Zon tenang dijumpai antara VIV dan getaran teruk pada kadar halaju berkurang 10 ? UR ? 15. Adapun pada ? = 22.5° dan 45°, hanya tindak balas VIV dijumpai pada halaju rendah dalam kadar 4? UR ? 9.

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