Increase in transmission loss of a double panel system by addition of mass inclusions to a poro-elastic layer: A comparison between theory and experiment

Abstract This paper is concerned with the modeling and optimization of heterogeneous (HG) blankets, which are used in this investigation to reduce the sound transmission through double panel systems. HG blankets consist of poro-elastic media with small embedded masses, which act similarly to a distributed mass–spring–damper-system. HG blankets have shown significant potential to reduce low frequency radiated sound from structures, where traditional poro-elastic materials have little effect. A mathematical model of a double panel system with an acoustic cavity and HG blanket was developed using impedance and mobility methods. The predicted responses of the source and the receiving panel due to a point force are validated with experimental measurements. The presented results indicate that proper tuning of the HG blankets can result in broadband noise reduction below 500 Hz with less than 10% added mass.

[1]  Paolo Gardonio,et al.  Active Control of Structure-Borne and Airborne Sound Transmission Through Double Panel , 1998 .

[2]  J. Ormondroyd.  Theory of the Dynamic Vibration Absorber , 1928 .

[3]  Chris R. Fuller,et al.  Increase in transmission loss of single panels by addition of mass inclusions to a poro-elastic layer: Experimental investigation , 2006 .

[4]  Philip A. Nelson,et al.  In-flight experiments on the active control of propeller-induced cabin noise , 1989 .

[5]  Stephen J. Elliott,et al.  ACTIVE ISOLATION OF STRUCTURAL VIBRATION ON A MULTIPLE-DEGREE-OF-FREEDOM SYSTEM, PART I: THE DYNAMICS OF THE SYSTEM , 1997 .

[6]  W. Thomson.  Vibration Theory and Applications , 1966 .

[7]  M. Slazak,et al.  Laboratory study of add-on treatments for interior noise control in light aircraft , 1983 .

[8]  Michael J. Brennan,et al.  ON THE ORIGINS AND DEVELOPMENT OF MOBILITY AND IMPEDANCE METHODS IN STRUCTURAL DYNAMICS , 2002 .

[9]  J. F. Wilby,et al.  Interior noise radiated by an airplane fuselage subjected to turbulent boundary layer excitation and evaluation of noise reduction treatments , 1971 .

[10]  S. Elliott,et al.  Radiation modes and the active control of sound power , 1993 .

[11]  Franck Sgard,et al.  Numerical and Experimental Investigation of the Vibro-Acoustics of a Plate Backed Cavity Coated With an Heterogeneous Porous Material , 2003 .

[12]  Lawrence E. Kinsler,et al.  Fundamentals of acoustics , 1950 .

[13]  Arthur W. Leissa,et al.  Vibration of Plates , 2021, Solid Acoustic Waves and Vibration.

[14]  Michael J. Brennan,et al.  Mobility and impedance methods in structural dynamics , 2018, Advanced Applications in Acoustics, Noise and Vibration.

[15]  F. A. Firestone.  A NEW ANALOGY BETWEEN MECHANICAL AND ELECTRICAL SYSTEMS , 1932 .

[16]  Simon J. Estève,et al.  Reduction of sound transmission into a circular cylindrical shell using distributed vibration absorbers and Helmholtz resonators. , 2002, The Journal of the Acoustical Society of America.

[17]  Raymond Panneton,et al.  An efficient finite element scheme for solving the three-dimensional poroelasticity problem in acoustics , 1997 .

[18]  Chris R. Fuller,et al.  Active control of sound transmission/radiation from elastic plates by vibration inputs. I - Analysis , 1990 .

[19]  G. SenCupta.  Reduction of Cabin Noise During Cruise Conditions by Stringer and Frame Damping , 1979 .

[20]  J. S. Mixson,et al.  Laboratory study of cabin acoustic treatments installed in an aircraft fuselage , 1986 .

[21]  A. Cummings,et al.  The transmission loss of double panels , 1967 .

[22]  I. Stothers,et al.  In-flight experiments on the active control of propeller-induced cabin noise , 1990 .

[23]  J. F. Wilby.  AIRCRAFT INTERIOR NOISE , 1996 .

[24]  Mingsian R Bai,et al.  Estimation of sound power of baffled planar sources using radiation matrices. , 2002, The Journal of the Acoustical Society of America.

[25]  Keith R. Matthews,et al.  Elementary Linear Algebra , 1998 .

[26]  Berkhoff.  Sensor scheme design for active structural acoustic control , 2000, The Journal of the Acoustical Society of America.

[27]  James P. Carneal.  Active structural acoustic control of double panel systems including hierarchical control approaches , 1996 .

[28]  G. B. Warburton,et al.  The Vibration of Rectangular Plates , 1954 .

[29]  C. I. Holmer.  Approach to interior noise control. I - Damped trim panels , 1985 .

[30]  Chris R. Fuller,et al.  Interior noise reduction of composite cylinders using distributed vibration absorbers , 2001 .

[31]  J. Allard.  Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials , 1994 .

[32]  Philip A. Nelson,et al.  Active Control of Sound , 1992 .