Analysis of Friction-Induced Instabilities in a Simplified Aircraft Brake

Investigation of gear walk suppression while maintaining braking performance in a main landing gear

“…1 l is the distance between the top of the piston rod and the outer cylinder mass center when the shock absorber is at the original place. 2 l is the length of the piston rod. .…”

“…It is defined as the longitudinal fore and aft motion of the landing gear, caused by the varying ground friction force and the braking torque during the braking process. Gear walk can build up to various levels, creating passenger discomfort, structural failures of landing gear components and even cause severe accidents [2]. Both the landing gear structure and the braking control system influence the gear walk phenomenon [3].…”

Methods to reduce non-linear mechanical systems for instability computation

“…The computational scheme of these methods were developed and the advantages of fractional approximants after the centre manifold approach were discussed; more particularly, the extension of the domain of validity by employing the fractional approximants and the possibility of obtaining an accurate solution even if the associated series expansion diverge was demonstrated. A natural extension of this problem is to show the capability of this centre manifold extension via the fractional approximant for a more complex non-linear mechanical system such as an aircraft brake system where the problem of unstable vibrations in disk brakes has been studied by a number of researchers ( [114], [9], [195], [68], [10], [63], [58], [32], [60], [127] and [68]). As illustrated in Figure 44, an aircraft brake system is composed of a stack of rotating brake discs (rotors) which engage the wheel, and stationary brake discs (stators), which engage the torque tube.…”

The Influence of Friction-Induced Damping and Nonlinear Effects on Brake Squeal Analysis

“…Because the transient method is computationally expensive, many scholars and engineers use complex eigenvalue analysis to study friction-induced dynamic instabilities [1][2][3][4][5][6][7][8][9].…”

“…Lee et al [4] implemented the MacNeal method in their analytical model. Hamzeh et al [5] and Moirot et al [6] took into account friction-induced positive damping effects. Bajer et al [1] and Kung et al [7] used the new feature in ABAQUS Version 6.4 to simulate brake squeal by combining the nonlinear static analysis with complex eigenvalue analysis.…”