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Flap mechanism is sophisticated and one part failure often affect other parts. This article mainly analyzes the physical failures of key parts in A320 flap and interactions of different components' physical failures. To analyze the interactions of different components, DMU is used to compute the collision, clearance and contact between them. At the same time, by introducing the concept of weighting...
Duo to the limitation of the gear-rack's structure profile for an aircraft slat, the maximum stress value got from test is not the value under actual load. In this paper, based on finite element model of gear-rack built by analysis software ABAQUS, the maximum stress value of gear-rack is determined by force analysis. Thus the strength of the gear-rack is checked, and finally the fatigue life is estimated...
The hydraulic systems are widely used in industry, but they would inevitably give rise to some failures. Firstly, this paper describes some hydraulic system failures in a reliability test. Secondly, it makes a detailed analysis for the reasons of failure. Lastly, some corresponding solutions are given for the different failures.
As the lock ring of the door lock mechanism has a complex structure which needs to be tough enough to withstand heavy load during the high-load-factor maneuver of the aircraft. Special attention should be paid to its strength issue. In order to assess its strength reliability, this paper firstly demonstrated a strength analysis with a simplified finite element model using Patran and MD Nastran. Then...
The simulation-based prediction of the mechanism kinematics accuracy is of great importance in engineering application. For widely used and low-cost open-loop mechanism having no feedback signals, it is important to take a balance between economic consideration and high accuracy requirement, thus containing high research value. Based on current widely used methods, this paper proposes a more precise...
Methods of FOSM (first order and second moment) or MCS (Monte Carlo simulation) are not suitable for some complex mechanisms, especially those with the characteristics of high dimensions, low failure rate and highly nonlinear. Gear door mechanism is one of the most important subsystems in landing gear system of the aircraft, and many of its components and factors affect the close position accuracy...
First, the seal reliability function of the O-ring, that is the maximum contact stress between O-ring and plunger must be greater than the fluid pressure, is established, then on the basis of the nonlinear constitutive equation Mooney-Rivlin of rubber material, the finite element model of the O-ring is built using commercial software ABAQUS, according to the finite element model, the distribution...
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