Contents of issue 4, vol. 27 (2002)

  1. W.M. Zawieska, The Conference NOISE CONTROL 2001, Archives of Acoustics, 27, 4, 259-261
  2. Z. Engel, M. Gawlik,, Vibroacoustic reciprocity principle in examination of musical instruments, Archives of Acoustics, 27, 4, 263-276
  3. Z. Engel, D. Pleban, L. Stryczniewicz, Investigation of emmision sound pressure using inversive method, Archives of Acoustics, 27, 4, 277-290
  4. J. Kompała, The utilisation of the GIS and GPS systems in creating acoustical databases for the outer environment, Archives of Acoustics, 27, 4, 291-302
  5. A. Czyżewski, J. Jaroszuk, B. Kostek, Digital waveguide models of the Panpipes, Archives of Acoustics, 27, 4, 303-317
  6. F. Klingholz, Breaking a lance for the psychoacoustics in phoniatrics, Archives of Acoustics, 27, 4, 319-329
  7. E. Danicki, Interaction of Rayleigh waves with periodic baffles, Archives of Acoustics, 27, 4, 331-338
  8. A. Ciarkowski, Propagation of the main signal in a dispersive Lorentz medium, Archives of Acoustics, 27, 4, 339-349
  9. M.G.S. Ali, M.R. Ebeid, Esam A. Mohamed, Ultrasonic propagation for measuring the activation energy and volume of a hole in liquids, Archives of Acoustics, 27, 4, 351-360
  10. A. Balcerzak, R. Płowiec, P. Kiełczyński, A. Juszkiewicz, Ultrasonic investigations of aqueus solutions of a-cyclodextrin and amphiphylic substances having different "heads" and identic "tails", Archives of Acoustics, 27, 4, 361-371
  11. Chronicle, The 49th Open Seminar on Acoustics in Poland (OSA 2002), Archives of Acoustics, 27, 4, 373-401
W.M. Zawieska, The Conference NOISE CONTROL 2001
The 12th International Conference on Noise Control - Noise Control'01 - was held in Kielce on 23-26 September, 2001. The conference was organized by the Acoustic Committee of the Polish Academy of Sciences, the Polish Acoustic Society, the Central Institute for Labour Protection, the Department of Mechanics and Vibroacoustics of the University of Mining and Metallurgy, and the Building Research Institute.


Z. Engel, M. Gawlik, Vibroacoustic reciprocity principle in examination of musical instruments
University of Mining and Metallurgy
Kraków, Mickiewicza 30, Poland
An application of the Reciprocity Principle for investigating certain acoustic parameters of the contrabass was presented in the paper. By means of direct measurements the vibroacoustic transfer function between the force occurring in the bridge of the contrabass and the acoustic pressure in the observation point was obtained. By means of reciprocity measurements the vibroacoustic transfer function between the volume velocity of the point sound source and the velocity of vibration of the element of the contrabass bridge was obtained. The compatibility of those transfer functions as well as the usefulness of the reciprocity method in acoustic examinations were assessed. Spectra of some sounds emitted by the contrabass were determined.


Z. Engel*,**, D. Pleban**, L. Stryczniewicz*, Investigation of emmision sound pressure using inversive method
*University of Mining and Metallurgy
Al. A. Mickiewicza 30, 30-059 Cracow, Poland
**Central Institute for Labour Protection
ul. Czerniakowska 16, 00-701 Warszawa, Poland
According to the Machinery Directive 98/37/EC the emission sound pressure level must be taken into consideration, together with the sound power level, in carrying out the acoustic assessment of machines. However the European Standard series EN ISO 11200 specifies methods for determining emission sound pressure the authors worked out the inversive method of the determination of emission sound pressure levels using sound source modelling by means of many substitute sources. The value of this level at specified position in the vicinity of the machine is calculated from the following parameters of the substitute sources:
  • the amplitude characteristic,
  • the phase characteristic.
  • The results of the determination of emission sound pressure levels using the inversive method are presented in the paper.


    J. Kompała, The utilisation of the GIS and GPS systems in creating acoustical databases for the outer environment
    Central Mining Institute
    40-166 Katowice, Plac Gwarków 1
    In the paper, the usability has been characterised of recent computer-based GIG and GPS techniques related to charging the environment with vibroacoustical hazards. These techniques, joining the computer maps of the area with extensive databases, provide new research and application possibilities in investigating the propagation of noise and mechanical vibration in the environment and are a valuable tool in the so-called environmental management.


    A. Czyżewski, J. Jaroszuk, B. Kostek, Digital waveguide models of the Panpipes
    Sound & Vision Engineering Department
    Gdańsk University of Technology
    Narutowicza 11/12, 80-952 Gdańsk, Poland
    kido@sound.eti.pg.gda.pl
    The aim of this paper is to present a digital waveguide model of the Panpipes. For the efficient modelling of the Panpipes instrument its structure and its physics were studied and discussed. Principles of the digital waveguide modelling of woodwind instruments were also briefly reviewed. In the paper two digital waveguide models of Panpipes instruments differing from each other in their complexity were presented. Consequently it enabled studying the influence of the decreasing complexity of the model on the resulting synthetic sound quality. The subjective tests performed showed that the simplifications in digital waveguide models introduced reveal no noticeable influence on the sound quality. Comparison of synthetic and real Panpipes sounds was also made and conclusions reached.


    F. Klingholz, Breaking a lance for the psychoacoustics in phoniatrics
    (Former: University of Munich, Faculty of Medicine)
    Am Hoehacker 3, D-82229 Seefeld, Germany
    Drawbacks of the acoustical as well as the perceptual voice analysis are discussed. The psychoacoustics is proposed as a new framework for a way out of the dilemma of the traditional voice analysis methods. The relevant features of the psychoacoustic measures with reference to the voice are introduced.


    E. Danicki, Interaction of Rayleigh waves with periodic baffles
    Institute of Fundamental Technological Research
    Polish Academy of Sciences
    00-049 Warszawa, Świętokrzyska 21, Poland
    Rayleigh waves in two solids separated by an air gap containing two alternate periodic in-plane baffle systems are considered. A Bragg reflection of the waves occurs when the distance between the baffle planes and between baffles and solids are half wavelength long in air. This may support an idea of contactless application of comb transducers to generate Rayleigh waves. The analysis is carried out using the BIS expansion method to account for the wavefield singularity at the baffle edges.


    A. Ciarkowski, Propagation of the main signal in a dispersive Lorentz medium
    Institute of Fundamental Technological Research
    Polish Academy of Sciences
    00-049 Warszawa, Świętokrzyska 21, Poland
    Evolution of the main signal in a Lorentz dispersive medium is considered. The signal propagating in the medium is excited by a sine-modulated pulse signal, with its envelope described by a hyperbolic tangent function. Both uniform and non-uniform asymptotic representations for the signal are found. It is shown how the uniform representation reduces to the non-uniform one. The results obtained are illustrated with a numerical example.


    M.G.S. Ali*, M.R. Ebeid*, Esam A. Mohamed**, Ultrasonic propagation for measuring the activation energy and volume of a hole in liquids
    *Physics Department, Faculty of Science, Minia University, Egypt
    **Computer Dept., Sadat Academy for Management Science, Egypt
    Mathematical expressions are introduced in this paper in order to measure the compressional relaxation time by the propagation of ultrasonic waves in associated and nonassociated liquids. The expressions are based on the concept of complex and frequency-dependent compressibility represented as a function of ultrasonic velocity and absorption in liquids. The available experimental data reported earlier in the literature are used in these mathematical expressions to calculate the molecular activation energy and the volume of a hole for some liquids. The introduced expressions concern the relations between the liquid compressional relaxation time and Frenkel's intermolecular relaxation time at different values of temperature and pressure. The effect of vibrational relaxation, bulk viscosity and structural rearrangement on ultrasonic absorption in liquids has been investigated.


    A. Balcerzak*, R. Płowiec*, P. Kiełczyński*, A. Juszkiewicz**, Ultrasonic investigations of aqueus solutions of a-cyclodextrin and amphiphylic substances having different "heads" and identic "tails"
    *Institute of Fundamental Technological Research
    Polish Academy of Sciences
    00-049 Warszawa, Świętokrzyska 21, Poland
    **Department of Chemistry, Jagiellonian University
    Ingardena 3, 30-060 Kraków, Poland
    Velocity and absorption of ultrasonic waves in aqueuos solutions of a-cyclodextrin containing amphiphil substances with different ``heads" and identic ``tails" were carried out. As a result of the mutual interactions between a-cyclodextrin and the amphiphil substance the low frequency ultrasonic relaxation process has been established. Thermodynamic and kinetic parameters related to this process have been calculated. Obtained results have been discussed considering molecular structure of the amphiphil substances.


    Chronicle, The 49th Open Seminar on Acoustics in Poland (OSA 2002)
    The Open Seminars on Acoustics (OSA) have a long-lasting tradition. They are organised usually in September in various places in Poland. Consecutive events are organised by seven local divisions of the Polish Acoustical Society taking turns. These seminars or, better, symposia are open to all fields of acoustics and play an important part in integrating the science of acoustics in our country. They started in 1954 and except for one year (due to martial law), have been organised each year. The present one was the 49th meeting and we are approaching a golden jubilee next year.
    The papers presented at the 49th OSA have been divided into plenary and section papers concerning different areas of acoustics.

    For more information about this site, email: Tadeusz Powałowski
    Joanna Żychowicz-Pokulniewicz
    Last updated: January, 2004