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Archives of Acoustics
EN A new hybrid method (HM) solution to the radiation problem is presented. The HM is based on the separation of variables method and the boundary element method. An idea of the HM consists in the modelling of acoustic variables only by the boundary element method using their discrete values. The geome[...]
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Archives of Acoustics
EN In this paper two new models of an acoustic source in BEM are proposed. For simplicity a plane axisymmetric source is modelled. Up to now, the models consist of elements of the same dimension. Furthermore, the nodes are equi-spaced on each element. In contrast to these models, the first new one is c[...]
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Archives of Acoustics
EN The paper is concerned with application of the BEM in the environmental noise problems. The main step of the BEM is the discretization of the boundary into elements. Using too many elements is not efficient. To eliminate this drawback, in this paper two ideas are proposed. First of them is the optim[...]
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Archives of Acoustics
2014 Vol. 39, No. 4 599--603
EN In this paper an active multimodal beam vibration reduction via one actuator is considered. The optimal actuator distribution is analyzed with two methods: an exact mathematical principles and the LQ problem idea. It turned out that the same mathematical expressions are derived. Thus, these methods [...]
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Archives of Acoustics
EN In the paper, a new method of the effectiveness increase of the active asymmetrical structure vibration reduction via PZTs is proposed. The new method is based on adding successive PZTs to quasi-optimal sub-areas (QO) in the determined order. A triangular plate with the C-F-F boundary conditions is [...]
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Archives of Control Sciences
EN An active reduction of transverse vibration of the triangular plate with P-F-F boundary conditions is considered. The cracked plate is idealized research model as partially clamped on one edge with varying clamped length. The active reduction is realised with PZTs. In the paper, assuming the detache[...]
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Archives of Acoustics
EN An efficiency of the nonsingular meshless method is analyzed in an acoustic indoor problem. The solution is assumed in the form of the series of radial bases functions. The Hardy’s multiquadratic functions, as the bases, are taken into account. The room acoustic field with uniform, impedance walls i[...]
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Archives of Acoustics
2018 Vol. 43, No. 2 227--233
EN The cuboidal room acoustics field is modelled with the Fourier method. A combination of uniform, impedance boundary conditions imposed on walls is assumed, and they are expressed by absorption coefficient values. The absorption coefficient, in the full range of its values in the discrete form, is co[...]
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Archives of Acoustics
2017 Vol. 42, No. 4 677--687
EN The Fourier method is applied to the description of the room acoustics field with the combination of uniform impedance boundary conditions imposed on some walls. These acoustic boundary conditions are expressed by absorption coefficient values In this problem, the Fourier method is derived as the co[...]
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