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Closely Spaced Modes of Launch Vehicle and Isolation from Its Engine

Author: WangLei
Tutor: FangBo
School: Harbin Institute of Technology
Course: General and Fundamental Mechanics
Keywords: Launch vehicle Finite Element Analysis Dense mode Metal Rubber Vibration Control
CLC: V430
Type: Master's thesis
Year: 2010
Downloads: 55
Quote: 0
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Abstract


Due to the application of the new high-thrust engine , the the mechanical environment deteriorating launch vehicle , and the effective isolation of engine vibration to the satellite equipment to pass to become a big problem . This article uses the Patran software modeling to the launch vehicle , using Nastran software post-processing , in order to reduce unnecessary modal calculation , we use the traditional multi- branch beam structure modeling . Simplified beam model of the physical structure , in order to verify the beam model , based on the physical structure of the carrier rocket , the establishment of a three-dimensional model . By calculating that the natural frequencies of the beam model error of up to 6% , good simulation of the launch vehicle 's true structure . We found that intensive launch vehicle modal not suitable for active vibration isolation here to adopt a passive approach , the use of metal rubber pad vibration isolation of the rocket engine . Visual changes , parametric modeling of the PCL language , assisted by the Visual C software programming of parameters as well as a batch mode , the pass rate . The final calculations by the large number of parameters calculated by analyzing the frequency of carrier rockets , and the pass rate to determine the various parameters of metal rubber material . In this thesis, the of metal rubber pad height and cross-sectional area of the metal rubber isolation effect , metal rubber isolation effect is getting better and better with the increased height or area increases , just the effect the change gradually slowed down . When the cross-sectional area for each of the engine metal rubber height of 0.1m, take 0.6m ~ 2 , the transmission rate can be reduced to about 50%, can be a good vibration isolation effect .

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Propulsion system ( engine, propeller ) > Engine theory and computing
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