History of structural analysis &amp; dynamics of Wärtsilä medium speed engines

Frondelius, Tero; Tienhaara, Hannu; Haataja, Mauri

doi:10.23998/rm.69735

Cited by 16 publications

(13 citation statements)

References 56 publications

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“…One of the biggest efforts has been the way of bringing the assembly loads, but, of course, the main thing has been this fretting research that already started fifteen years ago. Frondelius et al [70] give a nice review into the history of the numerical simulations in Wärtsilä.…”

Section: Example 2: Connecting Rod Simulations [48]mentioning

confidence: 99%

Simulation-Driven Development of Combustion Engines: Theory and Examples

Frondelius

Tienhaara

Kömi

et al. 2018

SAE Technical Paper Series

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T his paper describes the simulation-driven design process used in engines technology. The research question is "how to use research in the structural analysis and dynamics field to ensure world-class product development?" This paper describes research on simulation methodologies from the design process perspective, demonstrating the need for research in various steps of product development. Each section of the paper includes one or two practical examples in which research was needed to increase product design quality. In the product definition section, the Digital Design Platform (DDP) shows the coupling between product requirements and simulation tasks. At the concept design stage, it is shown that computational methods can optimize the placement of material in the case of the main bearing cap topology. The second example is JuliaFEM, an open-source finite element method (FEM) platform, which is suitable for heavy-duty method development, where the internals of the FE solver is needed to make new calculation methodologies available. The next section is about detailed design, where an example of an oil sump welds fatigue illustrates the continuous improvement of the simulation methodology. The second example is connecting rod fretting calculation, which illustrates the full complexity of the structural analysis and dynamics simulations. The second last process step is the virtual validation, where first the cylinder head simulation methodology shows the internal connections between different disciplines' simulations. Another example here is the crankshaft virtual validation process, which describes the complexity of the "simple" component calculation as well as illustrates the number of needed competencies. Finally, in the validation process step, Big Data analyses describe the internals and complexity of the methodologies. Lastly, counterweight measurement device development illustrates that validation of the simulation models and methods sometimes leads toward a measurement device development project. As a conclusion, all the previous methodologies are used to build the Wärtsilä 31 engine, which is the most efficient four-stroke engine in the world. It is, of course, a performance achievement, but a lot of research in simulation methodologies, as explained, was needed to make a reliable product with such a high cylinder peak pressure.

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Section: Example 2: Connecting Rod Simulations [48]mentioning

confidence: 99%

Simulation-Driven Development of Combustion Engines: Theory and Examples

Frondelius

Tienhaara

Kömi

et al. 2018

SAE Technical Paper Series

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“…Frondelius et al present a comprehensive literature review of medium-speed engine development [1]. The crankshaft is the heart of the engine and this study focuses on impactexcited vibration behavior in this component.…”

Section: Introductionmentioning

confidence: 99%

Finite element method modeling of crankshaft axial impact measurements

Vuotikka

Jokinen

Halla-aho

et al. 2020

RakMek

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It has been recently discovered that there is a periodical axial impact phenomenon in a running engine crankshaft. Bending of the shaft causes signiﬁcant extension of the crankshaft and impact to the engine block through the axial thrust bearing. The aim of this work is to study impact-induced energy ﬂuctuations in a complex-shaped Wärtsilä sixteen vee 32 engine crankshaft by using an explicit ﬁnite element method (FEM) during the ﬁrst 25 ms after impact. Using the FEM allows us to study real components used in industry, and analyze their dynamics in the transient phase. In conclusion, we found interesting results that can be used as guidelines for a full-scale crankshaft measurement instrumentation plan. The full-scale measurements will be performed later in the Wärtsilä Oy facility at Vaasa, Finland. The main ﬁnding is that a substantive amount of energy is trapped in the head region and the ﬁrst two crank pins of the crankshaft, which can aﬀect crankshaft durability regarding high-cycle fatigue.

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“…An optimization routine was applied to avoid possible resonance caused by the vibration. For example, in the high pressure fuel lines of reciprocating medium speed diesel engines and pumps, rotation excitations create undesirable mechanical vibration that is often the main trigger to cause damage to the system [1]. To avoid the need of fixing these issues on the field and to increase reliability, a simulation driven mindset was applied.…”

Section: Introductionmentioning

confidence: 99%

Pipe route optimization to avoid undesired vibration by using JuliaFEM

Rapo

Vaara

Aho³

et al. 2019

RakMek

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An optimization routine was applied to high pressure fuel pipes to avoid resonance in a heavily vibrating environment. The optimization process and also the natural frequency calculations in every iteration were completely performed with the high-level programming language Julia; the optimization process was performed with the JuMP optimization environment, and the frequencies where calculated with JuliaFEM finite element method solver platform. The benefit of this kind of embedded implementation is a quick response which yields a pleasant development environment to focus on the essential-the choice of the optimization strategy.

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History of structural analysis & dynamics of Wärtsilä medium speed engines

Cited by 16 publications

References 56 publications

Simulation-Driven Development of Combustion Engines: Theory and Examples

Simulation-Driven Development of Combustion Engines: Theory and Examples

Finite element method modeling of crankshaft axial impact measurements

Pipe route optimization to avoid undesired vibration by using JuliaFEM

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