Active feedback control of multiple waves in helicopter gearbox support struts

A study on active control of multiple waves in finite-length struts is presented. Modeling of such an active strut system that supports the gearbox over the helicopter fuselage is focused on in the study. An integrated mechanics model with feedback control of waves called the active spectral element model (ASEM) is used. The formulation allows one to account for coupling between longitudinal and flexural waves, dynamics of point or distributed sensors and dynamics of point or distributed actuators. Effects of finite strut and actuator dynamics are taken into account. Numerical investigations into collocated as well as non-collocated velocity feedback control of multiple axial, flexural and axial-flexural coupled waves are presented. Efficient computation using ASEM provides a powerful tool to study the sensitivity of the feedback parameters and various sensor-actuator configurations.

[1]  Stephen J. Elliott,et al.  Adaptive Control of Flexural Waves Propagating in a Beam , 1993 .

[2]  David W. Miller,et al.  A travelling wave approach to power flow in structural networks , 1989 .

[3]  Colin H. Hansen,et al.  An experimental study of the active control of multiple‐wave types in an elastic beam , 1992 .

[4]  T. K. Caughey,et al.  On the stability problem caused by finite actuator dynamics in the collocated control of large space structures , 1985 .

[5]  T. J. Sutton,et al.  ACTIVE ISOLATION OF MULTIPLE STRUCTURAL WAVES ON A HELICOPTER GEARBOX SUPPORT STRUT , 1997 .

[6]  Srinivasan Gopalakrishnan,et al.  A matrix methodology for spectral analysis of wave propagation in multiple connected Timoshenko beams , 1992 .

[7]  Michael J. Brennan,et al.  Mechanisms of noise transmission through helicopter gearbox support struts , 1994 .

[8]  Balakumar Balachandran,et al.  Analytical and experimental investigations into active control of wave transmission through gearbox struts , 2000, Smart Structures.

[9]  B Balachandran,et al.  Analytical study of active control of wave transmission through cylindrical struts , 2001 .

[10]  Balakumar Balachandran,et al.  Control of flexural wave transmission through struts , 1999, Smart Structures.

[11]  Norman M. Wereley,et al.  Active Interior Noise Control Studies , 1996 .

[12]  D. Roy Mahapatra,et al.  Spectral-Element-Based Solutions for Wave Propagation Analysis of Multiply Connected Unsymmetric Laminated Composite Beams , 2000 .

[13]  A. H. Von Flotow,et al.  Traveling wave control for large spacecraft structures , 1986 .

[14]  Colin H. Hansen,et al.  Active control of total vibratory power flow in a beam. I: Physical system analysis , 1991 .

[15]  Maxime P. Bayon de Noyer,et al.  Single Actuator and Multi-Mode Acceleration Feedback Control , 1998 .

[16]  Stephen J. Elliott,et al.  ACTIVE CONTROL OF WAVES ON A ONE-DIMENSIONAL STRUCTURE WITH A SCATTERING TERMINATION , 1996 .