Relevant bibliographies by topics / Lumped and Distributed-Lumped modelling

Academic literature on the topic 'Lumped and Distributed-Lumped modelling'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Lumped and Distributed-Lumped modelling"

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Gaudreault, M., and M. G. Stubbs. "Lumped-element components for GaAs monolithic microwave integrated circuits." Canadian Journal of Physics 63, no. 6 (June 1, 1985): 736–39. http://dx.doi.org/10.1139/p85-117.

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Gallium-arsenide monolithic microwave integrated circuits (GaAs MMIC's) promise the microwave circuit designer significant size, weight, and reliability advantages. Distributed and lumped matching techniques have been utilized previously in MMIC design with the latter offering greater bandwidth and smaller size. In this paper, experimental results for lumped interdigitated capacitors on a gallium-arsenide substrate are presented. Computer modelling in the frequency range 2–18 GHz was used to derive a set of design curves for these capacitors. These curves cover aspect ratios of w/s = 1 and w/s = 2.5. Experimental results obtained by using these curves to design lumped-element monolithic filters show excellent agreement with theory.
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Athanasiou, Panagiotis, and Yaser Hadi. "Simulation of Oil Well Drilling System Using Distributed–Lumped Modelling Technique." Modelling 1, no. 2 (November 12, 2020): 175–97. http://dx.doi.org/10.3390/modelling1020011.

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The strengths and torque of well-boiling hydrocarbons are of utmost significance. Boiling a well is one of the most critical steps in the discovery and production of oil and gas. The well’s boiling process is expensive because the drilling depth can be as much as 7000 meters. Any delay (breakdown time) in boiling costs a lot of money for hydrocarbon firms. Various boiler parameters are continuously tracked and regulated to avoid drilling delays. This paper focuses on the vibrations occurring at the bottom hole assembly (BHA) stick-slip. Two modelling methods, the lumped parameter model and the combination of the distributed–lumped (D–L) parameter model, were used and compared to the actual measurement performance. The D–L model was found to be more precise, particularly for long strings. Using the simulations, the most comprehensive modelling methodology is introduced.
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Herath, Herath Mudiyanselage Viraj Vidura, Jayashree Chadalawada, and Vladan Babovic. "Hydrologically informed machine learning for rainfall–runoff modelling: towards distributed modelling." Hydrology and Earth System Sciences 25, no. 8 (August 11, 2021): 4373–401. http://dx.doi.org/10.5194/hess-25-4373-2021.

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Abstract. Despite showing great success of applications in many commercial fields, machine learning and data science models generally show limited success in many scientific fields, including hydrology (Karpatne et al., 2017). The approach is often criticized for its lack of interpretability and physical consistency. This has led to the emergence of new modelling paradigms, such as theory-guided data science (TGDS) and physics-informed machine learning. The motivation behind such approaches is to improve the physical meaningfulness of machine learning models by blending existing scientific knowledge with learning algorithms. Following the same principles in our prior work (Chadalawada et al., 2020), a new model induction framework was founded on genetic programming (GP), namely the Machine Learning Rainfall–Runoff Model Induction (ML-RR-MI) toolkit. ML-RR-MI is capable of developing fully fledged lumped conceptual rainfall–runoff models for a watershed of interest using the building blocks of two flexible rainfall–runoff modelling frameworks. In this study, we extend ML-RR-MI towards inducing semi-distributed rainfall–runoff models. The meaningfulness and reliability of hydrological inferences gained from lumped models may tend to deteriorate within large catchments where the spatial heterogeneity of forcing variables and watershed properties is significant. This was the motivation behind developing our machine learning approach for distributed rainfall–runoff modelling titled Machine Induction Knowledge Augmented – System Hydrologique Asiatique (MIKA-SHA). MIKA-SHA captures spatial variabilities and automatically induces rainfall–runoff models for the catchment of interest without any explicit user selections. Currently, MIKA-SHA learns models utilizing the model building components of two flexible modelling frameworks. However, the proposed framework can be coupled with any internally coherent collection of building blocks. MIKA-SHA's model induction capabilities have been tested on the Rappahannock River basin near Fredericksburg, Virginia, USA. MIKA-SHA builds and tests many model configurations using the model building components of the two flexible modelling frameworks and quantitatively identifies the optimal model for the watershed of concern. In this study, MIKA-SHA is utilized to identify two optimal models (one from each flexible modelling framework) to capture the runoff dynamics of the Rappahannock River basin. Both optimal models achieve high-efficiency values in hydrograph predictions (both at catchment and subcatchment outlets) and good visual matches with the observed runoff response of the catchment. Furthermore, the resulting model architectures are compatible with previously reported research findings and fieldwork insights of the watershed and are readily interpretable by hydrologists. MIKA-SHA-induced semi-distributed model performances were compared against existing lumped model performances for the same basin. MIKA-SHA-induced optimal models outperform the lumped models used in this study in terms of efficiency values while benefitting hydrologists with more meaningful hydrological inferences about the runoff dynamics of the Rappahannock River basin.
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Alkaragoolee, MYA, KM Ebrahimi, and R. Whalley. "A hybrid model for a drilling process for hydrocarbon well-boring operations." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 231, no. 4 (March 7, 2017): 726–38. http://dx.doi.org/10.1177/1464419317697854.

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In hydrocarbon well-drilling operations, self-excited, stick-slip vibration is considered as a source of drilling equipment failures, which also causes a reduction in the drilling penetration. This leads to delays and increase in the operational and equipment costs. A new approach using distributed-lumped (hybrid) modelling is considered as the first step in understanding the stick-slip phenomena in order to determine a solution to this problem. In this paper, a hybrid modelling scheme is the advocated modelling method proposed in contrast to the conventional lumped modelling. Three case studies are used to show that hybrid modelling is an accurate technique in the representation of stick-slip oscillations, particularly when the length of the drill string is high. The results show that the modelling technique adopted in this work can more accurately present the phenomena associated with stick-slip process.
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GRANT, MALCOLM A. "MATHEMATICAL MODELLING OF WAIRAKEI GEOTHERMAL FIELD." ANZIAM Journal 50, no. 3 (January 2009): 426–34. http://dx.doi.org/10.1017/s1446181109000212.

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AbstractMathematical modelling of Wairakei geothermal field is reviewed, both lumped-parameter and distributed-parameter models. In both cases it is found that reliable predictions require five to ten years of history for calibration. With such calibration distributed-parameter models are now used for field management. A prudent model of Wairakei, constructed without such historical data, would underestimate field capacity and provide only general projections of the type of changes in surface activity and subsidence.
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Savenije, H. H. G. "HESS Opinions "Topography driven conceptual modelling (FLEX-Topo)"." Hydrology and Earth System Sciences 14, no. 12 (December 23, 2010): 2681–92. http://dx.doi.org/10.5194/hess-14-2681-2010.

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Abstract. Heterogeneity and complexity of hydrological processes offer substantial challenges to the hydrological modeller. Some hydrologists try to tackle this problem by introducing more and more detail in their models, or by setting-up more and more complicated models starting from basic principles at the smallest possible level. As we know, this reductionist approach leads to ever higher levels of equifinality and predictive uncertainty. On the other hand, simple, lumped and parsimonious models may be too simple to be realistic or representative of the dominant hydrological processes. In this commentary, a new approach is proposed that tries to find the middle way between complex distributed and simple lumped modelling approaches. Here we try to find the right level of simplification while avoiding over-simplification. Paraphrasing Einstein, the maxim is: make a model as simple as possible, but not simpler than that. The approach presented is process based, but not physically based in the traditional sense. Instead, it is based on a conceptual representation of the dominant physical processes in certain key elements of the landscape. The essence of the approach is that the model structure is made dependent on a limited number of landscape classes in which the topography is the main driver, but which can include geological, geomorphological or land-use classification. These classes are then represented by lumped conceptual models that act in parallel. The advantage of this approach over a fully distributed conceptualisation is that it retains maximum simplicity while taking into account observable landscape characteristics.
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Whalley, Robert, and Alaa Abdul-Ameer. "Warship propulsion system control." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 10 (January 17, 2012): 2402–21. http://dx.doi.org/10.1177/0954406211434389.

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The modelling of a dual gas turbine, single-shaft transmission drive, for a naval propulsion system, is considered. Owing to the spatial dispersion of the arrangement, a distributed–lumped parameter approach to the dynamic analysis problem is necessary. This enables the relatively concentrated assemblies to be included as lumped, pointwise representations and the propulsion shaft to be incorporated as a dispersed inertia and stiffness element. A multivariable, least effort controller design strategy is employed to achieve the regulation required. The performance of the closed-loop system following reference input and load disturbances is evaluated and the drive shaft speed and twist angle response transients are computed.
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Moustakas, Sotirios, and Patrick Willems. "Testing the Efficiency of Parameter Disaggregation for Distributed Rainfall-Runoff Modelling." Water 13, no. 7 (April 1, 2021): 972. http://dx.doi.org/10.3390/w13070972.

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A variety of hydrological models is currently available. Many of those employ physically based formulations to account for the complexity and spatial heterogeneity of natural processes. In turn, they require a substantial amount of spatial data, which may not always be available at sufficient quality. Recently, a top-down approach for distributed rainfall-runoff modelling has been developed, which aims at combining accuracy and simplicity. Essentially, a distributed model with uniform model parameters (base model) is derived from a calibrated lumped conceptual model. Subsequently, selected parameters are disaggregated based on links with the available spatially variable catchment properties. The disaggregation concept is now adjusted to better account for non-linearities and extended to incorporate more model parameters (and, thus, larger catchment heterogeneity). The modelling approach is tested for a catchment including several flow gauging stations. The disaggregated model is shown to outperform the base model with respect to internal catchment dynamics, while performing similarly at the catchment outlet. Moreover, it manages to bridge on average 44% of the Nash–Sutcliffe efficiency difference between the base model and the lumped models calibrated for the internal gauging stations. Nevertheless, the aforementioned improvement is not necessarily sufficient for reliable model results.
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Bartlett, H., and R. Whalley. "Analogue solution to the modelling and simulation of distributed-lumped parameter systems." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 212, no. 2 (March 1, 1998): 99–114. http://dx.doi.org/10.1243/0959651981539334.

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This paper presents an analogue solution to the modelling and simulation of distributed-lumped parameter systems. The solution is simple and is computationally attractive when compared with equivalent analytical approaches. To illustrate versatility two worked examples, taken from widely employed industrial applications, are presented. In the first the air flow in a long road tunnel is investigated while the second application shows the dynamical performance of a wide-faced rotor for a paper manufacturing process. The generality of the method and the industrial relevance of the proposal are demonstrated thereby.
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Margolis, Donald L. "A survey of bond graph modelling for interacting lumped and distributed systems." Journal of the Franklin Institute 319, no. 1-2 (January 1985): 125–35. http://dx.doi.org/10.1016/0016-0032(85)90069-9.

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Dissertations / Theses on the topic "Lumped and Distributed-Lumped modelling"

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Oh, Min. "Modelling and simulation of combined lumped and distributed processes." Thesis, Imperial College London, 1995. http://hdl.handle.net/10044/1/8197.

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Mejuto, Carlos. "Improved lumped parameter thermal modelling of synchronous generators." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4612.

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Within the existing available mix of numerical and analytical thermal analysis options, lumped parameter thermal modelling is selected as the operational backbone to develop an improved novel synchronous generator thermal modelling package. The objective is for the creation of a user friendly quick feedback tool, which can serve as a means to make quick machine design thermal calculations and answer customer queries quickly and reliably. Furthermore, thermally improved generator designs will allow for inevitable operational losses to be channelled away from the machine more efficiently. As a result, machine component temperatures will be reduced, allowing lower generator thermal ratings. The end result will be smaller, longer lasting, more efficient generators, with the ability to be adapted with greater ease to particular applications. With the contribution of selected numerical analysis techniques, mainly finite element analysis for the distribution of iron losses, the MySolver thermal modelling package is developed and presented in this thesis. It is this combination of numerical and analytical tools that improves synchronous generator thermal modelling accuracy, but ultimately it is the lumped parameter nature of the thermal models developed that makes MySolver succeed as a reliable quick feedback electrical machine thermal design tool, validated using experimental results for a wide range of operating conditions. The initial part of the thesis analyses the electrical machine thermal modelling techniques available today, indicating advantages and disadvantages associated with each one, and providing a rationale for the selection of lumped parameter modelling to be used by MySolver. The development of the synchronous generator lumped parameter thermal models is detailed, with examples on its construction presented. Subsequently, finite element analysis is utilised to predict the distribution of machine iron losses across the rotor and stator laminations, with the findings applied to MySolver. Furthermore, a study is performed into the lumped parameter discretisation level needed to effectively represent machine windings. MySolver is experimentally verified using experimental data from a fully instrumented synchronous generator and this data is also used to obtain further insight into the temperature distribution within the generator. In the final part results are evaluated and the use of MySolver for modelling and optimising electrical machines is discussed. Finally, appropriate conclusions on the work presented are drawn.
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Grobler, Andries Johannes. "Thermal modelling of a high speed permanent magnet synchronous machine / Andries J. Grobler." Thesis, North-West University, 2011. http://hdl.handle.net/10394/6528.

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Thermal modelling is of great importance in all electric machines but especially in permanent magnet synchronous machines (PMSMs). The thermally fragile permanent magnets (PMs) can more easily be demagnetized at high temperatures. When high speed machines are considered, heat extraction surfaces are small due to the higher energy density. This thesis focuses on the thermal modelling of a high speed slotless PMSM using analytical techniques. From literature it is clear that analytical distributed models have not reached its full potential in thermal modelling of electric machines. Thermal experiments on high speed electric machine, including rotor PM temperature measurements are not commonly found in literature. The thermal behaviour of each component of the machine is influenced by the overall temperature distribution. The widely used lumped parameter (LP) cylindrical component model derived by Mellor et al. is used to derive a LP model of the entire machine. A two dimensional (2-D) analytical distributed model is derived for the rotor PM using the separation of variables method. Three of the boundaries are assumed to be of the convection type and the fourth of constant heat flow type. Different convection coefficients are assumed to exist in the radial and axial directions. The distributed model is verified using COMSOL R and good correlation is shown. The distributed model is used to determine the temperature distribution in the PM and the convection heat flow in the axial direction. Loss calculation is an integral part of thermal modelling. Temperature changes in an electric machine is due to the interaction between the heat generation (losses) and heat removal. The losses found in a high speed slotless PMSM are investigated. A 2-D analytical magnetic model is used to determine the stator lamination loss as well as the stator winding eddy current loss. A simple LP model is derived for the rotor eddy current loss. Due to the relatively large resistivity of the shielding cylinder and PM material, the rotor eddy current loss is a significant part of the total machine loss. The tangential current width is determined empirically in this thesis but a 3-D distributed model which includes end space effects and skin depth could also be used. A large part of thermal modelling is empirically based. The convection and interface resistances are determined through a set of experiments in this thesis. The measured and calculated convection coefficients correlated well for both forced and natural convection cooling. A large temperature increase found during the no-load test can be attributed to large bearing loss, possibly due to axial loading. The LP model is modified to include the phenomena found during the experiments. The thermal model is used to predict the temperatures of a high speed PMSM at rated load and speed. Although the PM is not heated above the Curie temperature, demagnetization is still possible. According to the model, the machine will not be able to operate at full load and speed for extensive periods due to mechanical stress limits being exceeded. The temperature distribution of the PM could not be verified since the temperatures in the air gap and end space could not be measured. It is expected that axial heat flow will be larger than what is currently predicted by the distributed model. A sensitivity analysis was used to investigate the influence of the thermal resistances and losses on the machine temperatures. Methods for reducing the rotor eddy current loss and interface resistances are also discussed. The first contribution of this thesis is the 2-D analytical distributed model for the PM of a high speed PMSM. Hot spots and 2-D heat flow can be analysed using this model. Combining the LP and 2-D analytical distributed models is another contribution. This combines the simplicity and fast solution times of the LP model with the 2-D thermal distribution of the analytical distributed model. The systematic experimental investigation of the thermal behaviour of a high speed PMSM is a further contribution.
Thesis (Ph.D. (Electrical Engineering))--North-West University, Potchefstroom Campus, 2011.
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Alkaragoolee, Mohammed Y. A. "Hybrid Modelling and Optimisation of Oil Well Drillstrings." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/16859.

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The failure of oil well drillstrings due to torsional and longitudinal stresses caused by stick-slip phenomena during the drilling operation causes great expense to industry. Due to the complicated and harsh drilling environment, modelling of the drillstring becomes an essential requirement in studies. Currently, this is achieved by modelling the drillstring as a torsional lumped model (which ignores the length of the drillstring) for real-time measurement and control. In this thesis, a distributed-lumped model including the effects of drillstring length was developed to represent the drillstring, and was used to simulate stick-slip vibration. The model was developed with increasing levels of detail and the resultant models were validated against typical measured signals from the published literature. The stick-slip model describes the friction model that exists between the cutting tool and the rock. Based on theoretical analysis and mathematical formulation an efficient and adaptable model was created which was then used in the application of a method of species conserving genetic algorithm (SCGA) to optimise the drilling parameters. In conclusion, it was shown that the distributed-lumped model showed improved detail in predicting the transient response and demonstrated the importance of including the drillstring length. Predicting the response of different parameters along the drillstring is now possible and this showed the significant effect of modelling the drillcollar. The model was shown to better represent real system and was therefore far more suited to use with real time measurements.
Iraqi Government, Ministry of Higher Education and Scientific Research.
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Dimitriou, Vanda. "Lumped parameter thermal modelling for UK domestic buildings based on measured operational data." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23239.

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The development and use of thermal models is an integral part of the design process in existing buildings due for refurbishment. Energy predictions for existing buildings are often based on models which assume thermal property values of the building construction elements. However, once built, the actual thermal properties may differ significantly from their estimated values. Possible reasons include thermal bridging, material distortion and moisture content, sub-standard construction on-site and unavailability of construction details. The uncertainties can be reduced if the modelling process can also make use of operational measurements, such as the fuel use and internal temperatures, which have been recorded in the building during operation. To make use of operational data, performance-based models can be used. Performance-based models rely on measured data for the development of the model s architecture and for informing the estimation of the model parameters that would otherwise be based on the modeller s assumptions of the building s characteristics. One solution to the challenge of using performance-based models for existing buildings is to use the Lumped Parameter modelling approach. The Lumped Parameter modelling technique is often used for performance-based modelling of existing buildings due to the moderate knowledge of the building s physical properties required and the limited operational data needed for model training. This thesis investigates the potential of performance-based modelling techniques for existing UK domestic buildings, based on the Lumped Parameter thermal modelling technique, and the use of measured operational data to inform the model structure and parameters. Operational data have been collected in 20 homes as part of the REFIT project, an EPSRC-funded research project on Smart Meters and Smart Homes (REFIT, 2016). This thesis explores 11 houses from the REFIT dataset and, in particular, the temperature, gas and electricity measurements from the participating households, and develops whole-house and sub-system performance-based models using the Lumped Parameter technique. The suitability of simple performance-based Lumped Parameter models in representing typical UK domestic buildings using mainstream operational data such as temperatures and gas consumption measurements is explored. This thesis concludes on the adequacy of the operational data as measured. High correlations (>0.9) between whole-house average indoor temperatures and individual room air temperature measurements prove the use of averages adequate for representing the main rooms of the houses, whereas individual representation of the house s main rooms in use in the same model can prove challenging. A similar result is observed for whole-house radiator representation and the individual radiators. The relationships between the operational data is explored to inform the model structure and to identify collinearity and multi collinearity in the measurements. In terms of whole-house modelling, when using constraints for the parameter values during the model calibration to the measured data the resulting model parameters can be realistic and a good agreement to the measured data can be achieved (on average an RMSE of 1.03 for air temperature). The most significant parameters affecting the mean value of internal air temperatures are the external envelope resistance Re, the non-inertia elements (e.g. windows and doors) resistance, the window area for solar gains, boiler efficiency and the infiltration rate. The indoor air and internal element heat capacitance had the greatest impact on the swing in the internal air temperature (a 75% decrease in the capacitance value resulted in a 190.70% increase in the standard deviation value on average across the 11 houses). The building envelope heat capacitance and the envelope node positioning were the two parameters with the least impact on the model goodness of fit (a 75% decrease in capacitance and a value of 0.9 in envelope node positioning resulted in a 2.57% and 6.68% increase respectively in the RMSE on average across all 11 houses). Finally, the heating system representation using the Lumped Parameter model showed that the whole-house gas consumption data at the meter level, consisting of gas used for space heating as well as other purposes, is inadequate to drive the heating system model. A temperature threshold (e.g. of 1oC) indicating model overprediction can be used to remove the time-stamps of mixed use gas consumption from the model calibration. The heating system model can then be used to quantify gas consumption for space heating and non-space heating uses. In the 11 houses under study, 82.96% of the total gas consumption served for space heating, with 17.04% serving for other non-space heating purposes.
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Shi, Yubing. "Lumped-parameter modelling of cardiovascular system dynamics under different healthy and diseased conditions." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4198/.

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Cardiovascular disease is the most common cause of death in the modern society, and research into the diagnosis and treatment of cardiovascular diseases is an urgent task. Lumped-parameter mathematical modelling as an efficient and effective research technique has been extensively applied in the cardiovascular dynamics research, and has achieved enormous success in assisting the cardiovascular physiology study. This thesis reports a coherent work of lumped-parameter cardiovascular modelling based on some selected works that the author has conducted and published in the past several years. After a critical and comprehensive review of the concurrent lumped-parameter modelling technique, an improved lumped-parameter model that effectively describes the important cardiovascular features of heart valve dynamics and atrial-ventricular septum motion is presented. The model is then adapted to study several application cases of typical heart failure condition with ventricular assist device support, and extension of the lumped-parameter modelling for the optimisation of a pulsatile bioreactor in cardiovascular tissue engineering study. Some on-going works and future directions are also introduced. The reported modelling studies are useful for the cardiovascular physiology research and design optimisation of cardiovascular prosthetic organs.
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Siushansian, R. "Finite-volume time-domain modelling of complex geometries and lumped elements in generalised coordinate systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0020/NQ58191.pdf.

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Zhang, Shilong. "Lumped-parameter modelling of elastically coupled bodies: Derivation of constitutive equations and determination of stiffness matrices." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284462.

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Modelling of elastically coupled rigid bodies is an important research topic in multibody dynamics. We consider the problem of modelling what can be called flexural joints, where two essentially rigid bodies are coupled by a substantially more elastic body. For modelling general elastic couplings one would like to have generically applicable, lumped parameter, intuitive, Euclidean geometric, accurate models with desirable physical symmetries. The model constitutive equations should be easily and quickly computable. For purely elastic coupling the constitutive equations should be truly energy conservative: the configuration-wrench equations should be derivable from a potential function. Linear and angular momentum should be conserved. Quaternion-based and twist-based modelling methods are presented. The constitutive equations to calculate the configuration-wrench behavior are derived via geometric potential energy functions. Wrenches are computable given the configurations of the rigid bodies and all the stiffness matrices of the compliant element. For an arbitrary pair of elastically coupled rigid bodies there exist coincident, unique points on the bodies known as centers of stiffness at which translation and rotation are minimally coupled. At the center of stiffness there exist three sets of orthonormal principal axes and corresponding principal stiffnesses. These parameters are useful in both analysis and numerical simulation. A finite-element-based method for computing canonical stiffness parameters of elastically coupled rigid bodies is presented. The method is applied to notch hinges and Remote Center of Compliance (RCC) hinges. Standard procedures are presented on how to determine canonical stiffness parameters at the center of stiffness of a spatial compliance. Series of canonical stiffness parameters can be generated automatically using the methods provided. Key program listings are provided which can be used to duplicate the results presented.
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Mkadara, Geneviève, and Jean-Charles Maré. "Development of a lumped parameter model of an aerospace pump for condition monitoring purposes." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71205.

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This paper presents the development of a helicopter axial piston pump model with condition monitoring in mind. Industrial constraints and needs ask for modelling with a lumped-parameter approach and require model architecture to be addressed with care. The aim of the proposed model is to assess the merits of pump leakage monitoring through measurement of case pressure. Once reviewed the state of the art in pump modelling, the slipper/swashplate interface is taken as an example to propose and implement in Simcenter AMESim a variable gap height model. The simulation results show that commonly used lumped-parameter models overestimate leakage. It also points out that average leakage at slipper may reverse at high pump displacement.
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Ring, Emma. "Modelling a piezoelectric-driven actuator for active flow control." Thesis, Linköpings universitet, Reglerteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-114957.

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Flow control is an area of research of particular interest within automotive and aerospace industries since methods used to affect the fluid flow around vehicles can reduce drag and therefore lower their fuel consumption. One of these methods, which has generated a lot of interest in later years, is called active flow control and uses different types of actuators to impact the surrounding flow. In this thesis a model of a piezoelectric actuator for active flow control has been developed using Lumped Element Modelling and equivalent circuits. This approach, together with the chosen software for implementation, Simulink, provides models which are easy to simulate and evaluate. The actuator model has been validated using a novel methodology with sub-models with the purpose of reducing computational costs. The actuator is therefore divided into two submodels,one for structural and one for fluid dynamics, which are validated separately. This enables the use of simple yet accurate FEM and CFD models instead of time consuming FSI software which the complete model requires. The three implemented models have been validated using cases presented in previous studies and data from CFD-simulations. The results show that the decoupled models can be validated separately and its results can be integrated into the complete model, although further tests with a real actuator is needed. In addition to the modelling, a parameter study of the actuator has been performed in order to prepare for prototype design.
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Books on the topic "Lumped and Distributed-Lumped modelling"

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Pierre, Borne, Tzafestas S. G. 1939-, and International Association for Mathematics and Computers in Simulation., eds. Applied modelling and simulation of technological systems: Proceedings of the 1st IMACS Symposium on Modelling and Simulation for Control of Lumped and Distributed Parameter Systems, Lille, France, 3-6 June 1986. Amsterdam: North-Holland, 1987.

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Helszajn, J. Synthesis of lumped element, distributed and planar filters. London: McGraw-Hill, 1989.

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Kecman, V., ed. State-Space Models of Lumped and Distributed Systems. Berlin/Heidelberg: Springer-Verlag, 1988. http://dx.doi.org/10.1007/bfb0040972.

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Helszajn, J. Synthesis of lumped element, distributed and planar filters. London: McGraw-Hill, 1990.

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Kecman, V. State-space models of lumped and distributed systems. Berlin: Springer-Verlag, 1988.

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State-Space Models of Lumped and Distributed Systems. Springer, 1988.

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Booker, Henry G., M. Ronald Wohlers, and Nicholas Declaris. Lumped and Distributed Passive Networks: A Generalized and Advanced Viewpoint. Elsevier Science & Technology Books, 2017.

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Book chapters on the topic "Lumped and Distributed-Lumped modelling"

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Di Barba, Paolo, and Slawomir Wiak. "MEMS Modelling: Distributed versus Lumped Parameter Models." In MEMS: Field Models and Optimal Design, 5–7. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-21496-8_2.

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Mihalef, Viorel, Lucian Itu, Tommaso Mansi, and Puneet Sharma. "Lumped Parameter Whole Body Circulation Modelling." In Patient-specific Hemodynamic Computations: Application to Personalized Diagnosis of Cardiovascular Pathologies, 111–52. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56853-9_5.

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Dokos, Socrates. "Lumped Parameter Modelling with Ordinary Differential Equations." In Lecture Notes in Bioengineering, 29–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-642-54801-7_2.

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Molkens, T. "Lumped plasticity approach for the robustness assessment of structures." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 191–92. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348450-89.

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Molkens, T. "Lumped plasticity approach for the robustness assessment of structures." In Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 544–49. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003348443-89.

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Kang, Chia Chao, Mohd Fadzil Ain, Ali M. J. Zalzala, and Ihsan A. Zubir. "Lumped Element Equivalent Circuit Modelling for RF Energy Harvesting Antenna Array." In 9th International Conference on Robotic, Vision, Signal Processing and Power Applications, 455–61. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1721-6_49.

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Bormann, Helge, Lutz Breuer, Simone Giertz, Johan A. Huisman, and Neil R. Viney. "Spatially explicit versus lumped models in catchment hydrology – experiences from two case studies." In Uncertainties in Environmental Modelling and Consequences for Policy Making, 3–26. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2636-1_1.

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Costa, Luis R. J., Keijo Nikoskinen, and Martti Valtonen. "A Robust Technique for Modelling Nonlinear Lumped Elements Spanning Multiple Cells in FDTD." In Scientific Computing in Electrical Engineering SCEE 2008, 53–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12294-1_8.

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Giménez Mínguez, Paula, Bart Bijnens, Gabriel Bernardino, Èric Lluch, Iris Soveral, Olga Gómez, and Patricia Garcia-Canadilla. "Assessment of Haemodynamic Remodeling in Fetal Aortic Coarctation Using a Lumped Model of the Circulation." In Functional Imaging and Modelling of the Heart, 471–80. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59448-4_45.

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Soudah, Eduardo, Maurizio Bordone, Pooyan Davdan, and Riccardo Rossi. "A 1D Lumped-Parameter/3D CFD Approach for Pressure Drop in the Aortic Coarctation." In Statistical Atlases and Computational Models of the Heart. Imaging and Modelling Challenges, 26–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36961-2_4.

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Conference papers on the topic "Lumped and Distributed-Lumped modelling"

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Shang, H., G. K. Matthew, and W. Luo. "Comparison of Modelling Methods for Hydraulic Valve Gear." In ASME 1987 Design Technology Conferences. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/detc1987-0027.

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Abstract A combined lumped/distributed parameter model for the follower system of a hydraulically operated valve is compared to a lumped parameter model of the same system. Since previous results show excellent correspondence between the lumped/distributed parameter model and measured response, it is natural to attempt to simplify the model and to again perform a comparison. Results of several examples are shown.
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Tang, Hui, and Shan Zhong. "Lumped Element Modelling of Synthetic Jet Actuators." In 3rd AIAA Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3696.

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Dey, Anshuman, Navid Shafiei, Rahul Khandekhar, Wilson Eberle, and Ri Li. "Lumped Parameter Thermal Network Modelling of Power Transformers." In 2021 20th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (iTherm). IEEE, 2021. http://dx.doi.org/10.1109/itherm51669.2021.9503171.

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Do Ky, H., S. Meszaros, M. Cuhaci, and B. Syrett. "Physical Lumped Modelling of Thin-Film MIM Capacitors." In 1990 20th European Microwave Conference. IEEE, 1990. http://dx.doi.org/10.1109/euma.1990.336241.

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Yang, Shuo, Yacine Amara, Wei Hua, and Georges Barakat. "Towards a Generic Framework for Lumped Parameters Modelling." In 2019 19th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF). IEEE, 2019. http://dx.doi.org/10.1109/isef45929.2019.9096900.

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BARTLETT, H. "A MATHEMATICAL PROCEDURE FOR THE MODELLING AND SIMULATION OF DISTRIBUTED-LUMPED PARAMETER SYSTEMS." In Proceedings of the 6th IEEE Mediterranean Conference. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789814447317_0115.

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Ceroici, Christopher, Mohammad Maadi, and Roger J. Zemp. "Nonlinear lumped modelling of large-scale CMUT TOBE architectures." In 2015 IEEE International Ultrasonics Symposium (IUS). IEEE, 2015. http://dx.doi.org/10.1109/ultsym.2015.0469.

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Roldan-Villasana, Edgardo J., Ma J. Cardoso-Goroztieta, J. Antonio Tavira-Mondragon, and Miguel B. Rossano. "Lumped Parameters Modelling of the Waterwalls of a Power Plant Steam Generator." In 2010 European Modelling Symposium (EMS). IEEE, 2010. http://dx.doi.org/10.1109/ems.2010.53.

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Freundorfer, A. P., and Y. Jamani. "Lumped element circuit modelling in presence of substrate-through-via." In 1998 Symposium on Antenna Technology and Applied Electromagnetics. IEEE, 1998. http://dx.doi.org/10.1109/antem.1998.7861703.

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Louca, L. S. "Bond Graph Based Modal Representations And Model Reduction Of Lumped Parameter Systems." In 20th Conference on Modelling and Simulation. ECMS, 2006. http://dx.doi.org/10.7148/2006-0196.

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