Transient, nonlinear response analysis of soft bodied impact on flat plates including interactive load determination

1981 ◽  
Author(s):  
R. NIMMER ◽  
L. BOEHMAN
Keyword(s):  
Nonlinear Response ◽  
Response Analysis ◽  
Flat Plates

Nonlinear Dynamic Response Analysis of Aircraft Landing Gear with Finite Element Modeling

2016 ◽  
Vol 826 ◽  
pp. 23-27
Author(s):  
Wei Guo Wu ◽  
Zhen Tao Wang ◽  
Teng Jia
Keyword(s):  
Dynamic Response ◽  
Nonlinear Response ◽  
Shock Absorber ◽  
Landing Gear ◽  
Response Analysis ◽  
Nonlinear Fem ◽  
Fem Model ◽  
Nonlinear Dynamic Response ◽  
Aircraft Landing ◽  
Aircraft Landing Gear

The precise model and the analysis of nonlinear response are important for the landing gear research. In this paper, the FEM model of landing gear was established. The shock absorber is modeled with the nonlinear spring and damper. Random displacements were applied for simulating runway unevenness at aircraft taxiing. Through the simulation, the nonlinear FEM dynamic response of landing gear was acquired. The results show that: the stress of landing gear is large in the landing progress, especially for the random displacements; the weakness of landing gear is the axle sleeve. So the material and technology of the axle sleeve are important in the design of landing gear.

Nonlinear response analysis of marine risers

1992 ◽  
Vol 43 (2) ◽  
pp. 281-295 ◽  
Author(s):  
S. Ahmad ◽  
T.K. Datta
Keyword(s):  
Nonlinear Response ◽  
Response Analysis ◽  
Marine Risers

Nonlinear Analysis of Hysteretic-Friction Isolation System with Displacement-Constraint Device

2011 ◽  
Vol 90-93 ◽  
pp. 3173-3179
Author(s):  
Gui Feng Zhao ◽  
Yu Hong Ma ◽  
Yong Shan Zhang ◽  
Zuo Yu Sun
Keyword(s):  
Nonlinear Analysis ◽  
Nonlinear Response ◽  
Processing Method ◽  
Response Analysis ◽  
Analysis Program ◽  
Isolation System ◽  
Isolation Layer ◽  
Displacement Constraint ◽  
Inflection Points ◽  
Judgment Condition

For the displacement-constraint device with hysteric-friction isolation system, the judgment condition of soft-collision between the isolation layer and displacement-constraint device is put forward, the motion equation of the isolation system in consideration of friction and soft-collision is established, the nonlinear analysis program is worked out, and several kinds of inflection points in the program are given and the corresponding processing method of the inflection points is introduced. The nonlinear response analysis of the isolation system results indicate the displacement-restraint device can ensure the upper structure safety; also can decrease the displacement of the isolated layer.

Resonant Response of Mistuned Bladed Disk Expressed by Vibratory Stress

2016 ◽  
Author(s):  
Yasutomo Kaneko ◽  
Kazushi Mori ◽  
Hiroharu Ooyama
Keyword(s):  
Stress Response ◽  
Amplification Factor ◽  
Forced Response ◽  
Response Analysis ◽  
Flat Plates ◽  
Bladed Disks ◽  
Displacement Response ◽  
Bladed Disk ◽  
Excited Vibration ◽  
Blade Flutter

Although bladed disks of turbomachinery are nominally designed to be cyclically symmetric (tuned system), the vibration characteristics of all blades on a disk are slightly different due to the manufacturing tolerance, the deviation of the material property, the wear during operation, and so on. These small variations break the cyclic symmetry, and split the eigenvalue pairs. The actual bladed disks with the small variations are referred to a mistuned system. In the forced response of a mistuned bladed disk, the responses of all blades become different, and the response of a certain blade may become extremely large due to the split of the duplicated eigenvalues, the distortion of the vibration modes, and so on. On the other hand, many researchers suggest that the mistuning suppresses the blade flutter, because the complete travelling wave mode is not formed in a disk. In other words, the main conclusions of researches on mistuning are that while mistuning has an undesirable effect on the forced response, it has a beneficial (stabilizing) effect on the blade flutter (the self-excited vibration). Although such mistuning phenomena of bladed disks have been studied since 1980s, almost all studies focused on the amplification factor of the displacement response, and few studies researched the amplification factor of the vibratory stress response. In this study, first, the frequency response analysis of the mistuned simple bladed disk consisting of flat plates is carried out. Comparing the amplification factor of the displacement response with that of the vibratory stress response, the amplification factor expressed by the vibratory stress is studied in detail. Second, the mistuning analysis of the actual bladed disk used in a steam turbine is carried out. From these results, the mistuning effect expressed by the vibratory stress is clarified.

RC Building Damage Statistics and SDF Response with Design Seismic Forces

1999 ◽  
Vol 15 (3) ◽  
pp. 485-501 ◽  
Author(s):  
Shunsuke Otani
Keyword(s):  
Nonlinear Response ◽  
Response Analysis ◽  
Single Degree Of Freedom ◽  
Damage Survey ◽  
Ductility Demand ◽  
Kobe Earthquake ◽  
Lateral Resistance ◽  
Rc Building ◽  
Mexico Earthquake ◽  
Seismic Forces

This paper introduces the damage statistics of reinforced concrete buildings after the 1985 Mexico earthquake, the 1990 Ruzon (Philippines) earthquake, the 1992 Erzincan (Turkey) earthquake, and the 1995 Hyogo-ken Nanbu (Kobe) earthquake. These data were obtained in severely damaged areas in each earthquake through the inventory damage investigation of the Architectural Institute of Japan teams. The damage statistics indicated severer damage in taller buildings and significantly less damage in low-rise buildings. A series of nonlinear single-degree-of-freedom systems having minimum code required lateral resistance were analyzed using the earthquake motions recorded near the area of damage survey. Contrary to the statistics, the nonlinear response analysis results showed higher ductility demand (damage) in lower buildings.

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