Numerical Investigation of Blade Packet Vibrations

1997 ◽  
Author(s):  
Iouri S. Vorobev ◽  
Serge P. Kanilo ◽  
Elena I. Nikulina
Keyword(s):  
Finite Element ◽  
Vibration Mode ◽  
State Of The Art ◽  
Three Dimensional ◽  
Mode Shapes ◽  
Finite Element Models ◽  
Dimensional Finite Element ◽  
Single Structure ◽  
Three Dimensional Finite Element ◽  
The Cost

Vibrations are the great hazard for state-of-the-art gas and steam turbomachine blading. To improve the vibration behavior of the turbomachine blading, the blades are connected into packets. The influence of such connection on blading dynamics is complex, and additional investigations are required for every single structure. In this paper, numerical vibration analyses of the blade packets are carried out using detailed three-dimensional finite element models. As such problems are complex and expensive to solve, a method, considerably reducing the cost of eigenproblem solution, is proposed. The efficiency of the technique described is achieved due to the assumption that the packeted blades are identical. The results of the vibration analyses of the single blade and the blade packets using the technique discussed are presented. The complexity of the vibration mode shapes is shown. The numerical efficiency of the approach is analyzed.

FINITE ELEMENT ANALYSIS OF THE THERMAL BEHAVIOUR OF SINGLE-DISC CLUTCHES DURING REPEATED ENGAGEMENTS

Tribologia ◽  
2016 ◽  
Vol 266 (2) ◽  
pp. 9-24 ◽  
Author(s):  
Oday I. ABDULLAH ◽  
Laith Abed SABRI ◽  
Wassan S. Abd Al-SAHB
Keyword(s):  
Finite Element ◽  
Thermal Behaviour ◽  
Thermal Stresses ◽  
Three Dimensional ◽  
Finite Element Models ◽  
Element Analysis ◽  
Premature Failure ◽  
Friction Clutch ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Most of the failures in the sliding systems occur due to the high thermal stresses, which generated at the interface between the contacting surfaces due to sliding between parts, such as friction clutches and brakes. In this paper, the thermal behaviour of a single-disc clutch is investigated. The surface temperatures of the friction clutch disc will be increased during repeated engagements, in some cases, will lead to premature failure of the clutch disc. In order to avoid this kind of failure, it the surface temperature should be calculated with high accuracy to know the maximum working temperature of the friction system. In this work, the temperature distributions are computed during four repeated engagements at regular intervals (5 s) for the same energy dissipation. Three-dimensional finite element models are used to simulate the typical friction clutch disc.

Modal Analysis for Swing-Arm of LED Die Bonder

2011 ◽  
Vol 422 ◽  
pp. 379-382
Author(s):  
Wei Chuang Quan ◽  
Mei Fa Huang ◽  
Zhi Yue Wang ◽  
Da Wei Zhang
Keyword(s):  
Modal Analysis ◽  
Vibration Mode ◽  
Three Dimensional ◽  
Element Model ◽  
Mode Shapes ◽  
Vibration Modes ◽  
Lead Frame ◽  
Swing Arm ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Led die bonder used for bond lead frame and chip is one of the key equipment of led production line. The swing-arm is an important component of led die bonder and its dynamic characteristics will directly affect the piece accuracy. At present, the accuracy and efficiency of led die bonder are limited because of the vibration of the swing-arm. In solving this problem, a three-dimensional finite-element model for swing-arm is built to provide analytical frequencies and vibration modes. Then the modal distribution and vibration mode shapes for swing-arm are obtained after analyzing the modal by ansys10.0. Finally the dynamics effects of this structure by modal frequency and vibration mode are analyzed. The modal analysis of structural would provide the reference to dynamics analysis and structural optimization for swing-arm in practical use.

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