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29th International Congress on Sound and Vibration, ICSV 2023

作者： Rapp, Tobias Jacobs, Georg Berroth, Joerg Bahr, Sebastian Institute for Machine Elements and Systems Engineering RWTH Aachen Aachen Germany

ISBN: (纸本)9788011034238

Elastomeric engine mounts are used to optimize the noise-vibration-harshness (NVH) properties of almost every vehicle - decisively increasing the vehicle's perceived quality. In vehicle development, modelling the transmission behaviour of engine mounts is therefore mandatory. However, modelling elastomer components is generally impeded by their non-linear geometry properties as well as amplitude- and frequency-dependent non-linear material effects. Quantification of these effects can be achieved by time-consuming experimental component tests or potentially by deploying the finite element method (FEM). In FEM, the mount geometry is discretized in small finite elements, whereby the elastomer is represented by non-linear material models operating at the level of stresses and strains. Due to production- and material-mix-related scatter of elastomer properties, the material model parameters need to be identified experimentally for each individual material. To do so, test specimen of the to-be-modelled material are manufactured and investigated in dynamic test setups. However, the process of manufacturing test specimen involves considerable effort and potentially causes changes in material properties. To solve the resulting problem of imprecise models and to decrease the experimental effort, we developed a method to determine the stress-strain behaviour and thus material parameters directly from component tests. The method is based on a comparison of component tests and static FE simulations in the same loading direction deploying normalized hyperelastic material parameters. The simulations are used to quantify the non-linear mount geometry, obtaining the ratio of strains to normalized stresses. By correcting the experimental results for the influence of non-linear geometry, real stresses and strains are obtained. Hyperelastic, viscoelastic and elastoplastic material parameters are then identified by matching a material model to those stresses and strains utilizing an opt

关键词： Viscoelasticity

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AN IMPROVED METHOD FOR FEM MODELING AND PARAMETER IDENTIFICATION OF DAMPING IN BOLTED LAP JOINTS USING ZERO-THICKNESS elements 29

AN IMPROVED METHOD FOR FEM MODELING AND PARAMETER IDENTIFICA...

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29th International Congress on Sound and Vibration, ICSV 2023

作者： Wischmann, Stefan Berroth, Joerg König, Florian Jacobs, Georg Institute for Machine Elements and Systems Engineering RWTH Aachen University Aachen Germany

ISBN: (纸本)9788011034238

Optimizing the acoustic and structural dynamic properties of drive trains - often referred to as Noise, Vibration, and Harshness (NVH) - is paramount during the development process. Accurately modeling the transfer path from excitation sources to receiver points such as the operator is necessary to numerically predict the NVH behavior. The transfer path is mainly dominated by resonance frequencies and damping. In jointed structures, the damping within the joint is the dominant source of damping in the transfer path. Therefore, appropriate structural dynamic models of joint properties are necessary to optimize the NVH behavior of jointed structures without the need for expensive and time-consuming iterations on physical prototypes. Today, either modeling approaches using Iwan elements are used, which model the behavior between two discrete points, or approaches using zero-thickness elements are applied in FE simulations to model the locally distributed behavior of joints. The increased modeling accuracy using zero-thickness elements comes at a cost of expensive calculation times, which is especially disadvantageous during the parameter identification process, when multiple iterations of the structural dynamic behavior have to be executed. Therefore, this paper proposes a method for a computationally efficient parameter identification process for zero-thickness elements. The method allows considering the locally distributed effects of the joints in FE simulation of the NVH behavior of jointed structures. The suitability of the proposed method is demonstrated on the application example of the Brake Reuß Beam. The error between simulated and measured peak amplitude during resonance for different levels of force excitations is below 2.5 dB. © 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： Structural dynamics

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Bayesian inference-based wear prediction method for plain bearings under stationary mixed-friction conditions

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Friction 2024年第6期12卷 1272-1282页

作者： Florian KÖNIG Florian WIRSING Georg JACOBS Rui HE Zhigang TIAN Ming J.ZUO Institute for Machine Elements and Systems Engineering RWTH Aachen UniversityAachen 52062Germany Department of Mechanical Engineering University of AlbertaEdmonton T6G1H9Canada Qingdao International Academician Park Research Institute Qingdao 266000China

This study introduces a method to predict the remaining useful life(RUL)of plain bearings operating under stationary,wear-critical *** this method,the transient wear data of a coupled elastohydrodynamic lubrication(mixed-EHL)and wear simulation approach is used to parametrize a statistical,linear degradation *** method incorporates Bayesian inference to update the linear degradation model throughout the runtime and thereby consider the transient,system-dependent wear progression within the RUL prediction.A case study is used to show the suitability of the proposed *** results show that the method can be applied to three distinct types of post-wearing-in behavior:wearing-in with subsequent hydrodynamic,stationary wear,and progressive wear *** hydrodynamic operation leads to an infinite lifetime,the method is successfully applied to predict RUL in cases with stationary and progressive wear.

关键词： plain bearings wear modeling remaining useful life prediction Bayesian inference

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HOLISTIC DIGITAL PRODUCT DEVELOPMENT PROCESS FOR TAILORED FIBRE PLACEMENT REINFORCED PARTS

HOLISTIC DIGITAL PRODUCT DEVELOPMENT PROCESS FOR TAILORED FI...

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SAMPE 2024 Conference and Exhibition

作者： Wollert, Lars Emmerich, Rebecca Schalm, Tobias Aguirre, Diego Lenz, Julia Gries, Thomas Institut für Textiltechnik RWTH Aachen University Germany Institute of Structural Mechanics and Lightweight Design RWTH Aachen University Germany Institute for Machine Elements and Systems Engineering RWTH Aachen University Germany

ISBN: (纸本)9781934551455

Due to the complexity of production, fibre-reinforced plastic components are often manufactured in small or medium series in time-consuming manual processes. When using load-optimised production technologies, the tailored fibre placement (TFP) process is well established. But, the product development process is time consuming. Here, the missing connection between different development steps (e.g. load case optimisation, FEM analysis, draping and path planning) often leads to multiple iterations. For this purpose, a digital tool with links to common engineering software as well as financial and economic evaluation tools is indispensable. Using TFP as semi-finished textile production method is a promising process for an efficient production of load-optimised components. Currently, only a few manufacturers have the know-how to develop products while directly considering the entire process chain. Within the framework of the research project DigiPEP, a digitalisation of the entire product development process for TFP reinforced composite parts is being developed. Starting from a defined component geometry, the aim is first to simplify the development process through automated design processes and the implementation of the path planning of the embroidery pattern. In addition to the design of the optimal paths and component thickness, a draping model is part of the digital process chain. Especially for the mechanical design, a broad database for TFP preforms is required. For this purpose, critical shear angles for TFP semi-finished textiles with different manufacturing parameters are determined. For this, shear frame tests and an optical measurement method are used. These parameters can be used in the following for the implementation of the drape model and the transformation from 2D to 3D data. © 2024 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Fiber reinforced plastics

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Identification and Evaluation of Parameter Conflicts in Product Development Processes 33

Identification and Evaluation of Parameter Conflicts in Prod...

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33rd CIRP Design Conference

作者： Riedel, Ricarda Jacobs, Georg Florides, Constantinos Spütz, Kathrin Konrad, Christian Wieja, Franziska Institute for Machine Elements and Systems Engineering RWTH Aachen University Eilfschornsteinstraße 18 Aachen52062 Germany

Today, technology companies are confronted with challenges like shorter time to market, increasing interdisciplinarity in product development and growing exchange of data in processes between models and stakeholders. These challenges are particularly difficult to master in processes that involve high certification requirements or new technologies. Two examples of this are the development processes of medical products and tailored textiles (TT). TT are textiles with integrated local reinforcements that are inserted where they are needed. These local reinforcements can save material, weight and costs. Due to the novelty of this technology, no defined product development process (PDP) is currently applied in the industry, the responsibilities are unclear and the stakeholders involved have little knowledge of the extent to which the parameters of their models and process steps interact with other process steps, models and stakeholders. This lack of transparency in the process can cause conflicts and makes it difficult to optimize the product as a whole, which means that the potential of TT cannot be fully exploited. On the other hand, the PDP in medical engineering faces similar challenges as new technologies, such as bioabsorbable implant concepts, must be individually adapted to the respective patient for successful treatment of critical defects. For the final certification, the bioabsorbable solutions and the process must also meet the high regulatory requirements. To overcome these obstacles, the aim pursued by this work is the methodical modelling of PDP in order to identify critical parameters and conflicts. This methodical approach is intended to determine the influence of a parameter change in the PDP on other parameters, processes and stakeholders. In this context, the systems Modelling Language (SysML) is suitable for modelling and visualizing dependencies between parameters, processes and stakeholders in PDP. For the application of the methodology it is a nec

关键词： Textiles

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Improving Parameter Traceability in Model-Based Product Development Processes through Integration of Python-Based Domain Models 33

Improving Parameter Traceability in Model-Based Product Deve...

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33rd CIRP Design Conference

作者： Riedel, Ricarda Florides, Constantinos Stein, Sebastian Spütz, Kathrin Guerrero, Diego Aguirre Konrad, Christian Institute for Machine Elements and Systems Engineering RWTH Aachen University Eilfschornsteinstraße 18 Aachen52062 Germany

In today's product development processes (PDP), the complexity that companies want to master is growing as markets expand and interdisciplinarity increases. In previous and current research, approaches and methods are being developed to achieve a validated and verified product with the corresponding estimates of cost development as early as possible in the PDP. One of today's research approaches is focusing on modelling parameter and process dependencies that can be used to identify affected stakeholders, models, and process steps in the event of a potential change in a digital PDP so that far-reaching changes can be made efficiently. By the mentioned approach, the traceability of affected parameters into some domain models is possible, such as Microsoft Excel, an analysis into script-based domain models such as Python-based models are not established so far. The already established approach contains a system model in which a digital PDP for fiber-reinforced plastics (FRP) based on load path optimized local reinforced semi-finished products, more specifically tailored textiles (TT), is present. TT offer promising potential to reduce resulting waste compared to conventional FRP. In addition to the process steps, technical parameters from other expert models already exist in the system model and the stakeholders involved are created as roles. The present work will extend this approach with a proprietary approach by which Python-based simulation models can be implemented and whose model-specific parameters can also be efficiently analyzed and traced along the digital PDP. The method presented in this paper is intended to adapt a Python script-based production model for tailored fiber placement (TFP) to the existing system model. By extending the methodology, it is possible to identify parameters right down to the Python models that are relevant for the validation of requirements in the digital PDP. Furthermore, these parameters can also be affected by possible changes

关键词： Python

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Knowledge-supported Development of Function Models for Mechanical Products Using Intelligent Function Libraries 33

Knowledge-supported Development of Function Models for Mecha...

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33rd CIRP Design Conference

作者： Spütz, Kathrin Jacobs, Georg Konrad, Christian Wieja, Franziska Stürmer, Stefan Institute for Machine Elements and Systems Engineering RWTH Aachen University Schinkelstraße 10 Aachen52062 Germany

Today, there is an increasing need for cross-domain collaboration in development. In order to overcome the challenges arising from this cross-domain collaboration, current approaches focus on model-based, function-oriented product development. Model-based, function-oriented product development requires the modeling of functions in a modeling language such as the systems modeling language (SysML). Currently, the function modeling requires high modeling efforts. These arise especially when systems are decomposed to the elementary level for analysis or development. An approach used to reduce modeling effort is the use of function libraries. However, the effectiveness of these libraries is currently inhibited by the effort required to find suitable functions. The objective of this work is to enhance searching for suitable functions by proposing an intelligent function library, consisting of a SysML function library and an algorithm for filtering the library functions based on different search criteria. The algorithm supports the development team in the modeling of functions by automatic analysis of the functions already modeled and the suggestion of suitable functions from the function library based on this analysis. The innovation of this approach is, that the function library is easily customizable and flexibly extendable according to the company and their product portfolio. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0)

关键词： Product development

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Development of an OWL Ontology Based on the Function-Oriented System Architecture to Support Data Synchronization Between SysML and Domain Models 15

Development of an OWL Ontology Based on the Function-Oriente...

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15th International Conference on Knowledge engineering and Ontology Development, KEOD 2023 as part of the 15th International Joint Conference on Knowledge Discovery, Knowledge engineering and Knowledge Management, IC3K 2023

作者： Zhang, Yizhe Jacobs, Georg Zhao, Jia Berroth, Joerg Hoepfner, Gregor Institute for Machine Elements and Systems Engineering RWTH Aachen University Eilfschornsteinstr. 18 Aachen52062 Germany

ISBN: (纸本)9789897586712

A promising approach to systems engineering is called Model-Based systems engineering (MBSE), which is increasingly accepted to support the development process of complex systems. In MBSE,engineers use systems Modeling Language (SysML) for formalized modeling of function-oriented system architecture and solution architecture that enable the integration of various domain models to support a seamless system development process. Domain models simulate the physical behaviors of systems with design parameters so as to realize the quantitative analysis and verification of systems. These design parameters often exist in multiple heterogeneous data sources and often rely on manual importation into the SysML model. However, when systems become complex with a large data volume, manual data exchanges between multiple data sources and SysML models become time-consuming and error-prone. Therefore, this work proposes an ontology based on Web Ontology Language (OWL) for managing data in a standardized way and solving heterogeneous problems. Then, an automatic synchronization mechanism is established between the ontology and the SysML model for easy exchange of data. This work demonstrates and validates the proposed approach with a case study of a technical system (i.e., wind turbine system). The contribution of this work is the creation of a standardized OWL ontology that supports an automatic synchronization between the data from multiple domain models and the SysML models, thus reducing the manual effort of dealing with heterogeneous data sources and the risk of data inconsistency occurring in manual data transmission. Copyright © 2023 by SCITEPRESS – Science and Technology Publications, Lda. Under CC license (CC BY-NC-ND 4.0).

关键词： Ontology

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Topology optimization of nonlinear elastomer engine mounts considering the transfer behavior

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Forschung im Ingenieurwesen 2025年第1期89卷 1-10页

作者： Bahr, S. Jacobs, G. Höpfner, G. Hensel, E. Troge, J. Rapp, T. Institute for Machine Elements and Systems Engineering RWTH Aachen Aachen Germany Institute for Machine Tools and Forming Technology Fraunhofer Dresden Germany

Increasing global competition among electric vehicle manufacturers has elevated the Noise, Vibration, and Harshness (NVH) properties of drivetrains to a key quality feature. Unfavorable NVH properties occur when the drivetrain’s dynamic excitation forces excite modes of the sound-transmitting components at the respective eigenfrequencies. An established strategy to avoid this unwanted NVH behavior is topology optimization (TO), as it can shift unwanted modes of the drivetrain out of the excitation frequency range through geometrical adaptations using finite-element (FE) simulation. Another way to significantly influence unwanted NVH behavior in electric vehicle drivetrains are elastomer engine mounts which are employed to isolate the engine’s vibrations from the surrounding system and to dissipate vibrational energy. However, the effectiveness of these functionalities is limited in frequency ranges of local elastomer modes. Despite TO being well-established, challenges are given in shifting elastomer modes due to the complex material behavior. Firstly, the material’s softness results in an uncontrollably high density of local mount modes for TO, which presents a challenge in developing engine mounts without modes in the drivetrain’s excitation range, especially for electrified engines. Secondly, the elastomer’s nonlinear material impedes calculating the component’s modes with a linearized material approach. The goal of this contribution therefore is to develop a method that considers the complex material behavior of engine mounts in a TO process. To achieve this goal, the ideal transfer behavior of the engine mount, and consequently the positioning of mount modes within the frequency range, is determined based on the sound-transmitting structure and used as an objective for the optimization process. To consider the elastomer’s nonlinear transfer behavior during optimization, material parameters for each considered frequency are applied. The

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Classification of Simulation Models for the Model-based Design of Plastic-Metal Hybrid Joints 32

Classification of Simulation Models for the Model-based Desi...

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32nd CIRP Design Conference, CIRP Design 2022

作者： Spütz, Kathrin Berges, Julius Jacobs, Georg Berroth, Joerg Konrad, Christian Institute For Machine Elements And Systems Engineering Of The Rwth Aachen Schinkelstr. 10 Aachen52062 Germany

Laser-based hybrid joints (LBHJ) are promising due to low processing time and costs compared to conventional joining technologies. During the design of LBHJs, considering interactions between different domains (engineering, production, controlling) is required. This yields potential for a cross-domain design and optimization. However, considering the interactions is challenging and leads to iterations and inefficiency in product development. To map the interactions and exploit the potential of LBHJs, model-based systems engineering (MBSE) is a promising approach. With MBSE, domain models are integrated into a central system model and the model parameters are interconnected. To support a model-based design of LBHJs in the different phases of product development, usually several models are required. Therefore, multiple models in different fidelities for the same purpose exist (e.g. finite element and analytical models for joint strength estimation). Currently, this results in complex system models that are difficult to understand, reuse, extend, and maintain. The application of MBSE for the design of LBHJ is therefore inhibited. To overcome this deficit, the integration and linkage of domain models in the system model must be formally structured. Therefore, this paper presents a SysML metamodel, which classifies the domain models, defines their standardized structure and specifies their integration and linkage within the system model. The formal structuring is based on the classification criteria purpose. For each purpose, a superordinate model is built and connected to the domain models. To avoid complex system models that are vulnerable to changes, only superordinate domain models are linked with each other. Domain models can thus be easily replaced, without affecting the consistency of the system model. The results show that system models, built with this approach, can be easily created and used for the model-based design of LBHJs. Furthermore, interactions between

关键词： Product development

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