| IDENTIFICATION OF NONLINEAR PROPERTIES OF AN AIRCRAFT LANDING GEAR SHOCK STRUT |
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| 作者姓名： | Zhang Zengchang Zhang Jiangjan |
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| 作者单位： | Zhang Zengchang; Zhang Jiangjan(Institute of Vibrationn Engineering Research，Nanjing University of Aeronautics andAstronautics Nanjing，China . 210016) Wang Yuchang(Chinese Flignt Test Establishmennt，Xi'an，China 710089) |
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| 摘 要： | ＩＤＥＮＴＩＦＩＣＡＴＩＯＮＯＦＮＯＮＬＩＮＥＡＲＰＲＯＰＥＲＴＩＥＳＯＦＡＮＡＩＲＣＲＡＦＴＬＡＮＤＩＮＧＧＥＡＲＳＨＯＣＫＳＴＲＵＴＺｈａｎｇＺｅｎｇｃｈａｎｇ；ＺｈａｎｇＪｉａｎｇｊａｎ（ＩｎｓｔｉｔｕｔｅｏｆＶｉｂｒａｔｉｏｎｎＥｎｇｉｎｅｅ...
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IDENTIFICATION OF NONLINEAR PROPERTIES OF AN AIRCRAFT LANDING GEAR SHOCK STRUT |
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| Zhang Zengchang, Zhang Jiangjan.IDENTIFICATION OF NONLINEAR PROPERTIES OF AN AIRCRAFT LANDING GEAR SHOCK STRUT[J].Chinese Journal of Aeronautics,1994(3). |
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| Authors: | Zhang Zengchang Zhang Jiangjan |
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| Abstract: | A simple but realistic method for identifying nonlinear stiffness and damp-ing of an air-oil shock strut widely used in aircraft is developed.In the method a powerseries expansion is used to niodel the nonlinear dynamic properties of the strut. and after introducing new variables lhe nonlinear identitication problem can be reduced to alinear one with unknown linear paranieters. An unbiased, efficient and consistentestimator for the vector of the linear parameters is obtained under conditions of mini-mizing the sum of squared residuals which is assumed to be stationary and uncorrelatedwith the observed data.The order and the most effective independent variables in themodel are detennined by the criterion of residual series correlation infonnation entropyand the procedure of best subset regression, respectively. Experiinent demonstrates thatthe results are quite satisfactory, and the method developed is realistic, which can beused to study the dynamic properties of a strut in full detail. |
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| Keywords: | landing gear shock absorbers nonlinear system properties parameteridentification |
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