| 1. |
- Andersson, Daniel, et al.
(författare)
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Radar Images of Leaks in Building Elements
- 2015
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Ingår i: Energy Procedia. - : Elsevier BV. - 1876-6102. ; 78, s. 1726-1731
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Tidskriftsartikel (refereegranskat)abstract
- Through leakage in the building envelope there is a penetration of air, water vapor and particles. The degree of leakage of air can be quantified by existing methods. However, the location of adventitious openings is often not known. In order to overcome the limitations in existing methods, a non-contact and non-destructive method based on ultra-wide bandwidth radar technology is suggested. A test-bed is designed that can measure with different polarization to be able to detect flaws in different directions. Initial measurements shows promising results for further development of the method of using radar images to find leaks in building elements.
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| 2. |
- Andersson, Håkan, 1970-
(författare)
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A Co-Simulation Approach for Hydraulic Percussion Units
- 2018
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This Licentiate of Engineering thesis concerns modelling and simulation of hydraulic percussion units. These units are often found in equipment for breaking or drilling in rock and concrete, and are also often driven by oil hydraulics, in which complex fluid-structure couplings are essential for their operation.Current methodologies used today when developing hydraulic percussion units are based on decoupled analyses, which are not correctly capturing the important coupled mechanisms. Hence, an efficient method for coupled simulations is of high importance, since these mechanisms are critical for the function of these units. Therefore, a co-simulation approach between a 1D system simulation model representing the fluid system and a structural 3D FE-model is proposed.This approach is presented in detail, implemented for two well-known simulation tools and evaluated for a simple but relevant model. The Hopsan simulation tool was used for the fluid system and the FE-simulation software LS-DYNA was used for the structural mechanics simulation. The co-simulation interface was implemented using the Functional Mock-up Interface-standard.The approach was further developed to also incorporate multiple components for coupled simulations. This was considered necessary when models for the real application are to be developed. The use of two components for co-simulation was successfully evaluated for two models, one using the simple rigid body representation, and a second where linear elastic representations of the structural material were implemented.An experimental validation of the co-simulation approach applied to an existing hydraulic hammer was performed. Experiments on the hydraulic hammer were performed using an in-house test rig, and responses were registered at four different running conditions. The co-simulation model was developed using the same approach as before. The corresponding running conditions were simulated and the responses were successfully validated against the experiments. A parameter study was also performed involving two design parameters with the objective to evaluate the effects of a parameter change.This thesis consists of two parts, where Part I gives an introduction to the application, the simulation method and the implementation, while Part II consists of three papers from this project.
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| 3. |
- Andersson, Håkan, 1970-, et al.
(författare)
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Simulation of wear in hydraulic percussion units using a co-simulation approach
- 2023
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Ingår i: International Journal of Modelling and Simulation. - : Taylor & Francis. - 0228-6203 .- 1925-7082. ; 43:3, s. 265-281
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Tidskriftsartikel (refereegranskat)abstract
- In this study, a developed co-simulation method, which couples 1D-fluid and 3D-structural models, has been utilised to simulate wear in a hydraulic percussion unit. The effect of wear is generally detrimental on performance and lifetime for such units, but can also cause catastrophic failure and breakdown, requiring a total overhaul and replacement of core components. One experiment of standard straight impact was performed to investigate the tolerance against seizure. The percussion unit was operated at successively increasing operating pressures, and the level of wear was registered at each step, until seizure occurred. The co-simulation model was used to replicate the running conditions from the experiment to simulate the structural response to be used as input for the wear routine to calculate the wear depth. The wear pattern from the simulations corresponds well to the wear pattern from the experiment. Further, the effect of a misaligned impact on wear development was also studied, as this is a loading situation that typically occurs for hydraulic percussion units. The study demonstrates that the simulation method used has a potential for simulating wear and predicting seizure in hydraulic percussion units.
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| 4. |
- Andersson, Håkan, 1970-, et al.
(författare)
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System level co-simulation of a control valve and hydraulic cylinder circuit in a hydraulic percussion unit
- 2017
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Ingår i: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden. - Linköping : Linköping University Electronic Press. - 9789176853696 ; , s. 225-235
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Konferensbidrag (refereegranskat)abstract
- In this study a previously developed co-simulation method that is based on a 1D system model representing the fluid components of a hydraulic machinery, within which structural 3D Finite Element (FE) models can be incorporated for detailed simulation of specific sub-models or complete structural assemblies, is further developed. The fluid system model consists of ordinary differential equation sub-models that are computationally very inexpensive, but still represents the fluid dynamics very well. The co-simulation method has been shown to work very well for a simple model representing a hydraulic driven machinery. A more complex model was set up in this work, in which two cylinders in the hydraulic circuit were evaluated. Such type of models, including both the main piston and control valves, are necessary as they represent the real application to a further extent than the simple model, of only one cylinder. Two models have been developed and evaluated, from the simple rigid body representation of the structural mechanics model, to the more complex model using linear elastic representation. The 3D FE-model facilitates evaluation of displacements, stresses, and strains on a local level of the model. The results can be utilised for fatigue assessment, wear analysis and for predictions of noise radiation.
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| 5. |
- Andersson, Daniel, 1964
(författare)
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Barn i judisk tradition
- 2011
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Ingår i: Barn i religionernas värld / Jenny Berglund och Gunilla Gunner (red). - Stockholm : Liber. - 9789147099702 ; , s. 76-94
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Andersson, Daniel, 1964, et al.
(författare)
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Blickar in i Indien och hinduismens traditioner
- 2010
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Ingår i: India on my mind : en studieresa vintern 2007/2008. - Göteborg : University of Gothenburg. - 9188348342 ; , s. 159-174
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 7. |
- Andersson, Daniel, 1964
(författare)
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Bob Dylan och det religiösa språket
- 2004
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Ingår i: Tro, pop och kärlek, red: Andreas Häger. - 0780-1270. ; :Åbo Akademi nr 62, s. 61-79
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Andersson, Daniel, 1964
(författare)
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Chassidism i Sverige
- 2004
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Ingår i: Chaos Dansk-norsk tidsskrift for religionshistoriska studier. - 0108-4453. ; Religionsskift i Norden för og nu:Nr 41 2004, s. 73-92
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Tidskriftsartikel (refereegranskat)
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| 9. |
- Andersson, Daniel, 1964
(författare)
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De dödas dag i Mexico. Ett nytt religiöst fenomen
- 2007
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Ingår i: FINYAR Föreningen Forskning och information om nyreligiositet. - 1653-6754. ; Tema. Nyreligiositet, nyandlighet och döden:3-4, 2006/2007, s. 64-86
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Tidskriftsartikel (refereegranskat)
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| 10. |
- Andersson, Daniel, 1964
(författare)
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Döden i Mexico
- 2003
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Ingår i: CHAOS Dansk-Norsk Tidsskrift for religionshistoriske studier. - 0108-4453. ; Döden:Nr 39, 2003, s. 147-169
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Tidskriftsartikel (refereegranskat)
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