Contents of issue 1, vol. 31 (2006)
 R.J. Panuszka, K.A. Panuszka,
Frank Lloyd Wright's Samara, acoustical solutions of the 1950's,
Archives of Acoustics, 31, 1, 316
 L. Majkut,
Acoustical diagnostics of cracks in beam like structures,
Archives of Acoustics, 31, 1, 1728
 D. Kutzner,
Modelling the sound envelope auditory processing using the nonnegativeimpulseresponse
modulation filters concept. Part I. Initial simulations,
Archives of Acoustics, 31, 1, 2945
 P. Pękala,
Comparison of the conetracing simulation and the room impulse response measurements,
Archives of Acoustics, 31, 1, 4756
 A. Snakowska, H. Idczak,
The saddle point method applied to selected problems of acoustics,
Archives of Acoustics, 31, 1, 5776
 L. Leniowska,
Effect of active vibration control of a circular plate on sound radiation,
Archives of Acoustics, 31, 1, 7787
 W. Ciesielka, A. Gołaś,
Active control of sound by means of digital equalizers,
Archives of Acoustics, 31, 1, 8997
 E. Zieniuk, K. Szerszeń,
A solution of 3D Helmholtz equation for boundary geometry modeled by Coons patches
using the Parametric Integral Equation System,
Archives of Acoustics, 31, 1, 99111
Technical Notes
 P.H.T. Zannin, J.A.C. Ferreira,
Evaluation of performance of acoustic materials  a case study in
Brazilian civil construction,
Archives of Acoustics, 31, 1, 113119
 Chronicle,
35th Winter School on Wave and Quantum Acoustics,
Archives of Acoustics, 31, 1, 121142
 Chronicle,
34th Winter School on Vibroacoustical Hazards Suppression,
Archives of Acoustics, 31, 1, 143149

Archives of Acoustics, 31, 1, 316
R.J. Panuszka*, K.A. Panuszka**,
Frank Lloyd Wright's Samara, acoustical solutions of the 1950's
 *AGH University of Science and Technology
Al. Mickiewicza 30, 30059 Kraków, Poland
email: panuszka@localline.com
**Acoustical Consulting
Lafayette IN 47904, USA
email: kpanuszka@purdue.edu
(received April 30, 2005; accepted October 25, 2005)
 The problem of environmental noise pollution concerns many
Americans whose homes are near highways and busy streets. A famous
American Architect, Frank Lloyd Wright, designed houses that have
been noted for their architectural splendor and alleged acoustical
superiority over more traditional designs. Mr. Wright's acoustical
knowledge was tested by taking acoustical measurements and
comparisons of traffic noise transferred from the adjacent highway
(U S State Route 231). The sample home was a Usonian home and two
traditionally designed houses located adjacent to Mr. Wright's
design. Noise levels were significantly lower in the Usonian home
(called SAMARA by Mr. Wright) compared to the traditionally
designed houses. A difference of about 10 dBA existed due to Mr.
Wright's unique architectural design. Significant design concepts
contributing to this reduction included the excavation depth of
the house, screening by the carport, and screening by other
natural screens like wintergreen trees and shrubs.
 Key words: architect, Frank Lloyd Wright, Usonian, Samara, acoustics, noise.


Archives of Acoustics, 31, 1, 1728
L. Majkut,
Acoustical diagnostics of cracks in beam like structures
 AGH University of Science and Technology
Al. Mickiewicza 30, 30059 Kraków, Poland
email: majkut@agh.edu.pl
(received April 30, 2005; accepted October 25, 2005)
 In this paper, the acoustical symptoms of a constructional element with an edge
nonpropagating crack on the example of a cantilever beam are searched. In this work the
influence of a crack on flexural natural frequency was analysed. The crack is substituted by
a rotational spring, which flexibility is calculated using the Castigliano theorem and the
laws of the fracture mechanics.
 In this work the changes in the first and second natural frequency of the
flexural vibrations are showed as a function of location and depth of the crack. The acoustic
signal measured with a microphone placed above the beam is used for diagnostic systems.
 Changes in the natural frequency cannot be used for the identification of
a small crack (the depth is less than 10% of beam height). For the detecting of a smaller
crack, the effect of coupled different modes of vibration is presented. The paper presents a
modelling and analysis algorithm for cracked EulerBernoulli beams by considering the coupling
between the bending and axial vibration modes. The analysis of the coupled vibrations showed
that additional resonance frequencies appeared in the acoustic spectrum.
 Key words: acoustical diagnostic, crack, crack detection, vibration, coupled vibration.


Archives of Acoustics, 31, 1, 2945
D. Kutzner,
Modelling the sound envelope auditory processing using the nonnegativeimpulseresponse
modulation filters concept. Part I. Initial simulations
 Adam Mickiewicz University, Institute of Acoustics
Department of Room Acoustics and Psychoacoustics
Umultowska 85, 61614 Poznań, Poland
email: konsbol@wp.pl
(received May 25, 2005; accepted December 9, 2005)
 This article concerns with a new model of the sound envelope processing in
the auditory system. The socalled nonnegativeimpulseresponse (NNIR)
modulation filters concept argues that if any form of the acoustic signal
envelope filtering took place in the auditory pathway, this process should
not be described in terms of a bandpass filtration. This modification of
the traditional model of the auditory system temporal resolution, based on
the modulation filterbank (MFB) activity, results from the cardinal property
of the sound envelope and its neural representation, i.e. neural discharges
period histogram, which are unavoidably unipolar signals of nonnegative
values. It has been assumed that if hypothetical modulation filters existed,
they should be characterised by a nonnegativeimpulseresponse and,
consequently, the frequency characteristics of such filters might not reveal
the bandpass properties. The results of the model investigations are compared
with selected psychophysical and physiological data.
 Key words: amplitude modulation, the Hilbert transform, modulation
filterbank, impulse response, variance.


Archives of Acoustics, 31, 1, 4756
P. Pękala,
Comparison of the conetracing simulation and the room impulse response measurements
 Adam Mickiewicz University, Institute of Acoustics
Umultowska 85, 61614 Poznań, Poland
email: ppekala@amu.edu.pl
(received March 2, 2005; accepted December 9, 2005)
 The experimental verification of the acoustic field model based on the conetracing method
[1, 2] is described. With simulated echograms and the impulse responses obtained experimentally,
a set of parameters: Early Decay Time (EDT), C_{50} and C_{80}
were obtained. The parameters measured at many receiving sites and those calculated were compared. Mean
differences of less than 2 dB were observed for the octave band midfrequencies above 125 Hz.
 Key words: conetracing modelling, sound field optimisation, measurement verification.


Archives of Acoustics, 31, 1, 5776
A. Snakowska*, H. Idczak**,
The saddle point method applied to selected problems of acoustics
 *University of Rzeszów, Institute of Physics
Rejtana 16a, 35310 Rzeszów, Poland
email: asnak@univ.rzeszow.pl
**Wrocław University of Technology, Institute of Telecommunication and Acoustics
Wybrzeże Wyspiańskiego 27, 50370 Wrocław, Poland
email: henryk@zakus.ita.pwr.wroc.pl
(received July 11, 2005; accepted December 9, 2005)
 The paper is aimed at the presentation of examples of applying the saddle
point approximation method to some fundamental problems of acoustics and the
discussion of some interesting couplings between applied mathematical methods and
the physical interpretation of the results.
 The saddle point method is shortly reminded in its basic form, from
which more advanced versions, improving the results and widening the range of
possible applications, are derived. Two problems, solved at first for
electromagnetic waves and then applied to acoustics by means of ``the analogous
method'', have been chosen as examples. The first one is the phenomenon of the
reflection of a spherical wave at a plane interface between two media, the lower
of which is characterised by a higher velocity (water/sand, air/water). In this
case there is a critical angle above which a total reflection and a lateral wave
occur. The second example is the far field radiated from the outlet of a semiinfinite
circular duct. The physical insight into the understanding of the physical phenomena
provided by the saddle point method is stressed.
 Key words: saddle point method, waves propagation in layered media,
lateral wave, radiation from cylindrical duct.


Archives of Acoustics, 31, 1, 7787
L. Leniowska,
Effect of active vibration control of a circular plate on sound radiation
 University of Rzeszów, Institute of Technology
Rejtana 16a, 35310 Rzeszów, Poland
email: lleniow@atena.univ.rzeszow.pl
(received April 30, 2005; accepted October 23, 2005)
 An active control of the vibration cancellation of a circular fluidloaded plate is
analytically studied. The purpose of this paper is to examine the effect of the active vibration
control strategy on the sound radiation generated by a plate. It was assumed that a planar
vibrating structure located in a finite baffle and interacting with fluid is driven by a
periodic force with constant amplitude. This structure radiates the acoustic waves into a
surrounding fluid and a point control force is used to reduce its vibrations. The simulations
of the active cancellation of the plate vibrations were made with a Simulink/Matlab computer
program. The results demonstrate, that while a control law provided a significant reduction in
the plate vibration, it is rather ineffective for noise attenuation.
 Key words: vibration control, sound radiation, circular plate, LQR controller.


Archives of Acoustics, 31, 1, 8997
W. Ciesielka, A. Gołaś,
Active control of sound by means of digital equalizers
 AGH University of Science and Technology
Department of Mechanics and Vibroacoustics
Al. Mickiewicza 30, 30059 Kraków, Poland
email: ghciesie@cyfkr.edu.pl, ghgolas@cyfkr.edu.pl
(received April 30, 2005; accepted October 25, 2005)
 The article describes singlechannel digital systems, enabling active sound control
according to the set criterion. Theoretical fundamentals of these systems are based on digital
filter theory, using which the digital graphic, phase, inverse and adaptive equalizers have
been designed and programmed. The described systems have been implemented into two cards with
signal processors TMS320C25 and TMS320C31 made by Texas Instruments. The article presents
mathematical models of the above mentioned equalizers and results of the experimental tests,
which verify their performance.
 Key words: active sound control, digital equalizer.


Archives of Acoustics, 31, 1, 99111
E. Zieniuk, K. Szerszeń,
A solution of 3D Helmholtz equation for boundary geometry modeled by Coons patches
using the Parametric Integral Equation System
 University of Białystok, Department of Mathematics and Physics
Institute of Computer Science
Sosnowa 64, 15887 Białystok, Poland
email: ezieniuk@ii.uwb.edu.pl, kszerszen@ii.uwb.edu.pl\\[3mm]
(received April 30, 2005; accepted October 25, 2005)
 In this paper, the authors propose an algorithm for numerical solution of
the 3D Helmholtz equation using the Parametric Integral Equation System (PIES).
The PIES, unlike the traditional Boundary Integral Equation (BIE), is characterized
by the fact that the boundary geometry has been considered in its mathematical formalism.
Polygonal Coons surfaces have been used to describe the 3D domain. This makes it possible
to obtain continuous solutions without any discretization of the 3D domain.
 Key words: Helmholtz equation, Boundary Integral Equation (BIE), Parametric Integral
Equation System (PIES).


Archives of Acoustics, 31, 1, 113119
Technical Notes
P.H.T. Zannin, J.A.C. Ferreira,
Evaluation of performance of acoustic materials  a case study in
Brazilian civil construction
 Universidade Federal do Paraná  Departamento de Engenharia Mecânica
Laboratório de Acústica Ambiental  Industrial e Conforto Acústico
Centro Politécnico  Bairro Jardim das Américas
CEP: 81.531990  Curitiba  PR  Brasil\\
email: zannin@demec.ufpr.br
(received November 15, 2004; accepted August 18, 2005)
 Urban noises are emitted simultaneously by a wide variety of sources, such as, transportation and
activities encountered in large cities. Many studies show that traffic noise followed by noise produced
by neighbours are the main disturbing sources. Considering that both traffic and neighbour noise upset
people inside their homes, it is possible to conclude that these homes do not display good performance
of one of their purposes, which is the one of providing acoustic comfort. This fact is critical in
Brazilian homes, as opposed to countries such as Germany and the USA, since these countries have
specific rules for acoustic properties of materials used in civil construction, and Brazil does not.
The goal of the present study is to show the acoustic performance of materials routinely used in Brazilian
civil construction. Measurement procedures both in situ and in the laboratory are presented to
determine acoustic performance of the materials, such as: insulation coefficient for air propagation.
The results have shown that the acoustic performance of Brazilian constructions, are under
international standard.
 Key words: sound insulation, acoustic comfort, civil construction, urban noise,
insulation coefficient.


Archives of Acoustics, 31, 1, 121142
Chronicle,
35th Winter School on Wave and Quantum Acoustics
 Ustroń, 27th February  3rd March 2006
 I have a great pleasure to give the "Archives of Acoustics" Readers possibility acquaint with topics
presented at 35th Winter School on Wave and Quantum Acoustics. This School, organized by Upper Silesian
Division of the Polish Acoustical Society and Institute of Physics at Silesian University of Technology, is
planned at February/March 2006 in beautiful scenery of Silesian Beskidy Mountains.
 As always, the School has been a place where achievements of various sections of acoustics (especially
molecular acoustics, quantum acoustics, acoustooptics, magnetoacoustics, acoustoelectronics, photoacoustics,
acoustics of solids etc.) are being exchanged. Moreover, some similar and related topics, for example
optoelectronics and thermal wave methods, will be presented too.
 For the second time the School will be divided on three different, but complementary, parts  Winter
Workshops (WW). Chronologically it will be: 2nd WW on Acoustoelectronics and Optoelectronics (chairman:
prof. Tadeusz Pustelny), 2nd WW on Molecular and Quantum Acoustics (chairwoman: dr Marzena Dzida) and
11th WW on Photoacoustics and Thermal Waves Methods (chairman: prof. Jerzy Bodzenta). This dividing was
very well accepted by Participants.
 After acceptation by revivers the School lectures will be published in one of two journals  in Journal
de Physique IV  Proceedings (which is published by EDP Sciences and covered in the ISI database) or in
Journal of Molecular and Quantum Acoustics (annual journal published by Upper Silesian Division of the
Polish Acoustical Society). Moreover, all Participants will obtain a folder with Program of the School
and full set of the one page abstracts obtained by organizers.
 Once again we have taken pains to organize this conference taking into account the fact that it is an
important event for acousticians, opticians and other Polish and foreign scientists. We hope that this
reach conference program will gain acceptance and respect among its potential participants. We count
on your numerous response and active participation.
 In behalf of Organizers: Roman Bukowski, coordinator of the School


Archives of Acoustics, 31, 1, 143149
Chronicle,
34th Winter School on Vibroacoustical Hazards Suppression
 Ustroń, 27th February  3th March 2006
 I invite you to acquaint with abstracts of selected lectures submitted to presentation in 34th
Winter School on Vibroacoustical Hazards Suppressions. This national School, organized by Upper
Silesian Division of the Polish Acoustical Society and Institute of Physics at Silesian University of
Technology, is planned at February/March 2006 in Ustroń.
 The conference is the forum for all environmental vibroacoustics fields. Particularly it concern
to traffic noise, industry noise, vibroacoustics of machines, room acoustics, noise protection and
similar problems. During the School the theoretical works, experimental, measuring, technical,
applied and normative ones are presented.
 The School lectures, and other conference materials, will be published in the "Materials of the
XXXIV Winter School on Vibroacoustical Hazards Suppressions" edited by dr. Mieczysław Roczniak
(chairman of the conference). This publication is intend to participants of the School and for many
libraries in Poland.
 Other information about XXXIV WS on VHS you can find at address
http://gnom.matfiz.polsl.gliwice.pl/zzw/zzw_06/.
 In behalf of Organizers: Roman Bukowski, coordinator of the School
