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149 results on '"Miehling, Jörg"'

2. 3D Body Twin: Improving Human Gait Visualizations Using Personalized Avatars

Author

Zieger, Daniel, Güthlein, Florian, Henningson, Jann-Ole, Jakob, Verena, Gaßner, Heiko, Shanbhag, Julian, Fleischmann, Sophie, Miehling, Jörg, Wartzack, Sandro, Eskofier, Björn, Winkler, Jürgen, Egger, Bernhard, Stamminger, Marc, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Wachinger, Christian, editor, Paniagua, Beatriz, editor, Elhabian, Shireen, editor, Luijten, Gijs, editor, and Egger, Jan, editor

Published
2025
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4. Contributing Components of Metabolic Energy Models to Metabolic Cost Estimations in Gait

Author

Gambietz, Markus, Nitschke, Marlies, Miehling, Jörg, and Koelewijn, Anne

Subjects
Computer Science - Machine Learning
Abstract

Objective: As metabolic cost is a primary factor influencing humans' gait, we want to deepen our understanding of metabolic energy expenditure models. Therefore, this paper identifies the parameters and input variables, such as muscle or joint states, that contribute to accurate metabolic cost estimations. Methods: We explored the parameters of four metabolic energy expenditure models in a Monte Carlo sensitivity analysis. Then, we analysed the model parameters by their calculated sensitivity indices, physiological context, and the resulting metabolic rates during the gait cycle. The parameter combination with the highest accuracy in the Monte Carlo simulations represented a quasi-optimized model. In the second step, we investigated the importance of input parameters and variables by analysing the accuracy of neural networks trained with different input features. Results: Power-related parameters were most influential in the sensitivity analysis and the neural network-based feature selection. We observed that the quasi-optimized models produced negative metabolic rates, contradicting muscle physiology. Neural network-based models showed promising abilities but have been unable to match the accuracy of traditional metabolic energy expenditure models. Conclusion: We showed that power-related metabolic energy expenditure model parameters and inputs are most influential during gait. Furthermore, our results suggest that neural network-based metabolic energy expenditure models are viable. However, bigger datasets are required to achieve better accuracy. Significance: As there is a need for more accurate metabolic energy expenditure models, we explored which musculoskeletal parameters are essential when developing a model to estimate metabolic energy.

Published
2023
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5. On the Influence of Incorrect Idealized Joint Axes to the Design Process of Orthoses

Author

Steck, Patrick, Scherb, David, Miehling, Jörg, Wartzack, Sandro, Tavares, João Manuel R. S., Series Editor, Jorge, Renato Natal, Series Editor, Cohen, Laurent, Editorial Board Member, Doblare, Manuel, Editorial Board Member, Frangi, Alejandro, Editorial Board Member, Garcia-Aznar, Jose Manuel, Editorial Board Member, Holzapfel, Gerhard A., Editorial Board Member, Hughes, Thomas J.R., Editorial Board Member, Kamm, Roger, Editorial Board Member, Li, Shuo, Editorial Board Member, Löhner, Rainald, Editorial Board Member, Nithiarasu, Perumal, Editorial Board Member, Oñate, Eugenio, Editorial Board Member, Perales, Francisco J., Editorial Board Member, Prendergast, Patrick J., Editorial Board Member, Tamma, Kumar K., Editorial Board Member, Vilas-Boas, Joao Paulo, Editorial Board Member, Weiss, Jeffrey, Editorial Board Member, Zhang, Yongjie Jessica, Editorial Board Member, Skalli, Wafa, editor, Laporte, Sébastien, editor, and Benoit, Aurélie, editor

Published
2024
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10. Evidence for the Applicability of Musculoskeletal Human Models to Improve Outcomes of Total Hip Arthroplasty

Author

Scherb, David, Fleischmann, Christopher, Sesselmann, Stefan, Miehling, Jörg, Wartzack, Sandro, Tavares, João Manuel R. S., Series Editor, Jorge, Renato Natal, Series Editor, Cohen, Laurent, Editorial Board Member, Doblare, Manuel, Editorial Board Member, Frangi, Alejandro, Editorial Board Member, Garcia-Aznar, Jose Manuel, Editorial Board Member, Holzapfel, Gerhard A., Editorial Board Member, Hughes, Thomas J.R., Editorial Board Member, Kamm, Roger, Editorial Board Member, Li, Shuo, Editorial Board Member, Löhner, Rainald, Editorial Board Member, Nithiarasu, Perumal, Editorial Board Member, Oñate, Eugenio, Editorial Board Member, Perales, Francisco J., Editorial Board Member, Prendergast, Patrick J., Editorial Board Member, Tamma, Kumar K., Editorial Board Member, Vilas-Boas, Joao Paulo, Editorial Board Member, Weiss, Jeffrey, Editorial Board Member, Zhang, Yongjie Jessica, Editorial Board Member, Bourauel, Christoph, editor, Geris, Liesbet, editor, and Vander Slote, Jos, editor

Published
2023
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12. Patient-Specific Modelling for Preoperative Estimation of Hip Mechanics for Improved Planning of Total Hip Endoprosthesis Using Multibody Simulations

Author

Leher, Irina, Fleischmann, Christopher, Scherb, David, Kollerer, Marius, Miehling, Jörg, Wartzack, Sandro, Sesselmann, Stefan, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, and Taiar, Redha, editor

Published
2022
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13. Simplifying Ergonomic Assessment for Designers: A User-Product Interaction-Modelling Framework in CAD

Author

Wolf, Alexander, Wagner, Yvonne, Oßwald, Marius, Miehling, Jörg, Wartzack, Sandro, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Black, Nancy L., editor, Neumann, W. Patrick, editor, and Noy, Ian, editor

Published
2022
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17. Segmentation of Musculotendinous Structures of the Hip from 3D Imaging for Patient-Specific Individualization of Biomechanical Simulations

Author

Fleischmann, Christopher, Scherb, David, Leher, Irina, Wolf, Alexander, Miehling, Jörg, Wartzack, Sandro, Sesselmann, Stefan, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, Taiar, Redha, editor, Langlois, Karine, editor, and Choplin, Arnaud, editor

Published
2021
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25. Biomechanical Digital Human Models: Chances and Challenges to Expand Ergonomic Evaluation

Author

Peters, Markus, Quadrat, Eric, Nolte, Alexander, Wolf, Alexander, Miehling, Jörg, Wartzack, Sandro, Leidholdt, Wolfgang, Bauer, Sebastian, Fritzsche, Lars, Wischniewski, Sascha, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, Karwowski, Waldemar, editor, and Taiar, Redha, editor

Published
2019
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30. The balance between a usable and emotional product design – a comparison of different methods for prioritising relevant influencing factors.

Author

van Remmen, Judith, Horber, Dennis, Händel, Jonas, Miehling, Jörg, and Wartzack, Sandro

Subjects
USER experience, DECISION making, NEW product development, PRODUCT design, COMMERCIAL products
Abstract

Designing an equally usable and emotionally appealing product remains a challenge for product developers, not least due to conflicting goals. Product developers need to constantly map the affective user requirements to the product, whereby the requirements for the emotional and usable product design often cannot be equally addressed. The systematic approach presented can help product developers in conflicting decision-making situations to represent these affective user requirements by selecting and prioritising context-relevant influencing factors using multi-criteria decision-making methods. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Femoral Shape and Size Variability from segmented CT datasets for patient-specific THA planning

Author

Fleischmann Christopher, Leher Irina, Sesselmann Stefan, Scherb David, Wolf Alexander, Miehling Jörg, and Wartzack Sandro

Subjects
total hip arthroplasty, biomechanics, segmentation, multibody simulation, subject-specific modeling, surgery planning, orthopaedics, Medicine
Abstract

Biomechanical functionality of artificial hips strongly correlates with quality of life of patients after total hip arthroplasty. As the numbers of total hip arthroplasty are growing due to increasing life expectancy, biomechanical research is of utmost importance to improve the implants used and the operative procedures applied. Multibody simulation is used to predict forces and moments inside the human body. Generic scaling is usually performed to adapt the human models used in multibody simulation to individual patients. However, since the shape and size of the bones can vary considerably, this type of scaling often is not sufficient. In this work various CT datasets were used to quantify differences of individual femoral shapes, especially with regard to important biomechanical hip parameters, such as the CCD angle or the femoral offset. Our results prove that multibody simulations should be modeled more patientspecific to be able to calculate articular forces and moments more precisely, and thus, to improve surgical planning.

Published
2020
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34. A Co-Simulation Model Integrating a Musculoskeletal Human Model with Exoskeleton and Power Tool Model.

Author

Molz, Carla, Scherb, David, Löffelmann, Christopher, Sänger, Johannes, Yao, Zhejun, Lindenmann, Andreas, Matthiesen, Sven, Weidner, Robert, Wartzack, Sandro, and Miehling, Jörg

Subjects
ROBOTIC exoskeletons, POWER tools, ANIMAL exoskeletons, NEW product development, HUMAN body, HUMAN beings
Abstract

Featured Application: This research aims to provide a co-simulation model to derive design optimizations for technical support systems regarding the user needs. Working at and above head height with a power tool represents a common activity in craft and assembly applications. To assist and protect the user from overload and injuries in these situations, the development and use of application-specific support systems, such as exoskeletons and power tools, have greatly increased in recent years. Thus, the integration of aspects of the user-centered product development of support systems in the early phases of product development process has high potentials. A common approach to integrate the user early in the product development process is the use of musculoskeletal human models, which allow the evaluation of effects on the human body. This could also be applicable in the mentioned use case to enable the evaluation of the interactions for the user. Therefore, a co-simulation model for virtual modelling and simulating human–machine interactions is presented. The co-simulation model is made up of a musculoskeletal human model and the models of the technical systems (exoskeleton and power tool). By applying the co-simulation model, the impact of technical systems on the human body can be taken into account to derive design alternatives for the technical system due to the requirements of the user. The paper describes the design of the co-simulation model and particularly, the interaction of the submodels. The evaluation of the co-simulation model is carried out with the help of a subject study for the selected use case working at and above head height. The results show plausible results for the muscle loads considering the support by an exoskeleton. Furthermore, the comparison of simulated results to measured muscle activations via surface electromyography shows a good agreement. Thus, the co-simulation model passes the test for functionality and seems to be applicable for the derivation of design alternatives of technical systems regarding the user needs. In future, the co-simulation model will be further validated with a higher number of subjects and to implement design alterations in the technical systems. [ABSTRACT FROM AUTHOR]

Published
2024
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40. A NEW METHOD FOR PASSIVE ANKLE FOOT ORTHOSIS DESIGN – INTEGRATION OF MUSCULOSKELETAL AND FINITE ELEMENT SIMULATION.

Author

Scherb, David, Steck, Patrick, Völkl, Harald, Wartzack, Sandro, and Miehling, Jörg

Subjects
FOOT orthoses, MOVEMENT disorder treatments, MUSCULOSKELETAL system, ORTHOPEDIC apparatus, FINITE element method, PRODUCT design
Abstract

Motor disorders are diseases affecting the muscle function of the human body. A frequently occurring motor disorder affects the lower leg muscles resulting in a pathological gait called foot drop. Patients have a higher risk of stumbling and falling. The most common treatment is the use of a passive ankle-foot-orthosis (AFO). However, the compensation of foot drop is only limited due to the non possible support of all rotational directions of the ankle joint. Therefore, a newly developed concept for a passive AFO is currently in work. To ensure a best possible treatment of the patient, the provided support by the AFO and required support by the patient have to be in accordance. Thus, in this contribution a method is presented that integrates model order reduced finite element analysis for computing the provided support of the AFO and musculoskeletal human models for representing the patients' gait behaviour. With the method, the design of the force generating structures of the AFO can be realized regarding the patients' requirements. The presented method is further evaluated with a specific use case. The main focus lies here in the principal functionality of the method and the provision of valid results. [ABSTRACT FROM AUTHOR]

Published
2023
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41. A NEW DESIGN METHOD FOR GENERATING SURROGATE KINEMATIC TRUSS ORTHOSES TO SUPPORT PATHOLOGICAL GAIT PATTERNS IN HUMAN MODEL SIMULATIONS.

Author

Steck, Patrick, Scherb, David, Mayer, Johannes, Jäger, Michael, Miehling, Jörg, Völkl, Harald, and Wartzack, Sandro

Subjects
GAIT in humans, ORTHOPEDIC apparatus, LIFE expectancy, CENTRAL nervous system diseases, HUMAN kinematics, USER-centered system design
Abstract

With increasing life expectancy, the risk of diseases of the central nervous system, such as cancer, strokes, etc., also increases. Strokes often result in injury to the sciatic nerve, which is responsible for controlling the calf muscles (plantar and dorsal flexors). A so-called ankle joint orthosis (AFO) helps to support the pathological gait and to avoid foot drop during gait. Passive orthoses are of particular importance for research, as they do not require additional incoming energy from outside to the orthotic system. However, current passive orthoses are often not personalized. On the one hand, because they usually have only a temporary muscle-building function and, on the other hand, because the individual design process is computationally time consuming and thus expensive. This paper presents a possibility to pre-dimension and pre-design passive orthoses fast and cost-efficiently by reducing the complexity of the model based on volume-optimized truss elements. Therefor a traditional high calculation intensive design procedure is compared with the complexity reduced model to show its effectiviness and the similarity of the results. [ABSTRACT FROM AUTHOR]

Published
2023
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