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- Deckers, E., et al.
(författare)
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A novel wave based prediction technique for the efficient dynamic modelling of poro-elastic materials
- 2009
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Ingår i: 8th European Conference on Noise Control 2009, EURONOISE 2009 - Proceedings of the Institute of Acoustics. - 9781615676804
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Konferensbidrag (refereegranskat)abstract
- The most commonly used prediction techniques to study the behaviour of poro-elastic materials are based on the finite element method (FEM). In the case of poro-elastic materials, certain material properties are frequency dependent. This implies that the system matrices have to be recalculated for each frequency, which is time consuming and disadvantageous for the method. As frequency increases, the model size increases drastically, such that these methods are restricted to low-frequency calculations. This paper presents a novel wave based prediction technique to solve the poro-elastic Biot wave equations in an efficient manner. wave functions that exactly satisfy the governing differential equations are used as an expansion set to describe the field variables. This leads to small model sizes and allows the method to be applied also at higher frequencies. The paper describes the basic concepts of the method and illustrates its potential through some dedicated two-dimensional validation calculations.
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- Ghadri, J. R., et al.
(författare)
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International Expert Consensus Document on Takotsubo Syndrome (Part I): Clinical Characteristics, Diagnostic Criteria, and Pathophysiology
- 2018
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Ingår i: European Heart Journal. - : Oxford University Press (OUP). - 0195-668X .- 1522-9645. ; 39:22, s. 2032-2046
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Tidskriftsartikel (refereegranskat)abstract
- Takotsubo syndrome (TTS) is a poorly recognized heart disease that was initially regarded as a benign condition. Recently, it has been shown that TTS may be associated with severe clinical complications including death and that its prevalence is probably underestimated. Since current guidelines on TTS are lacking, it appears timely and important to provide an expert consensus statement on TTS. The clinical expert consensus document part I summarizes the current state of knowledge on clinical presentation and characteristics of TTS and agrees on controversies surrounding TTS such as nomenclature, different TTS types, role of coronary artery disease, and etiology. This consensus also proposes new diagnostic criteria based on current knowledge to improve diagnostic accuracy.
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- Ghadri, J. R., et al.
(författare)
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International Expert Consensus Document on Takotsubo Syndrome (Part II): Diagnostic Workup, Outcome, and Management
- 2018
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Ingår i: European Heart Journal. - : Oxford University Press (OUP). - 0195-668X .- 1522-9645. ; 39:22, s. 2047-2062
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Tidskriftsartikel (refereegranskat)abstract
- The clinical expert consensus statement on takotsubo syndrome (TTS) part II focuses on the diagnostic workup, outcome, and management. The recommendations are based on interpretation of the limited clinical trial data currently available and experience of international TTS experts. It summarizes the diagnostic approach, which may facilitate correct and timely diagnosis. Furthermore, the document covers areas where controversies still exist in risk stratification and management of TTS. Based on available data the document provides recommendations on optimal care of such patients for practising physicians.
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- Rönnberg, Sarah, et al.
(författare)
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On waveform distortion in the frequency range of 2 kHz–150 kHz—Review and research challenges
- 2017
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Ingår i: Electric Power Systems Research. - : Elsevier BV. - 0378-7796 .- 1873-2046. ; 150, s. 1-10
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Forskningsöversikt (refereegranskat)abstract
- The frequency range between 2 and 150 kHz has recently gained significant attention, triggered by standardization needs and increased emission in this wide frequency range. This paper gives an overview of the state-of-the-art concerning these so-called supraharmonics, and noticeably indicates the research challenges associated with waveform distortion in this frequency range, with emphasis on the following aspects: emission; propagation; interference; measurements; standardization; modelling and simulation.
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- Vergote, K., et al.
(författare)
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On the potential of the wave based method for the efficient optimisation of local vibration control treatments for structural components
- 2012
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Ingår i: International Conference on Noise and Vibration Engineering 2012, ISMA 2012, including USD 2012. - : Katholieke Universiteit Leuven. - 9781622768257 ; , s. 1985-2002
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Konferensbidrag (refereegranskat)abstract
- Local vibration absorbers, such as tuned vibration absorbers or local active control systems, can be used to reduce the response of structural components. The optimisation of the position, the number and the properties of these absorbers, is however a problem of many unknowns. This paper studies the use of an efficient simulation technique, namely the wave based method (WBM), in order to obtain these optimal parameters. In contrast to the finite element method (FEM), where the problem is divided into a large number of small elements in which the field variable is described using simple polynomial shape functions, the WBM divides the problem into a small number of domains in which exact solutions of the governing equation are used as basis functions. This approach not only leads to a numerical efficient technique for the simulation of a system response, it also has inherent advantages over the FEM in an optimisation context. This paper studies the advantages of the WBM in a gradient based optimisation scheme and applies the proposed method for the optimisation of local resonators in order to reduce the vibrational response of a simple plate.
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