{ "types" : { "Bookmark" : { "pluralLabel" : "Bookmarks" }, "Publication" : { "pluralLabel" : "Publications" }, "GoldStandardPublication" : { "pluralLabel" : "GoldStandardPublications" }, "GoldStandardBookmark" : { "pluralLabel" : "GoldStandardBookmarks" }, "Tag" : { "pluralLabel" : "Tags" }, "User" : { "pluralLabel" : "Users" }, "Group" : { "pluralLabel" : "Groups" }, "Sphere" : { "pluralLabel" : "Spheres" } }, "properties" : { "count" : { "valueType" : "number" }, "date" : { "valueType" : "date" }, "changeDate" : { "valueType" : "date" }, "url" : { "valueType" : "url" }, "id" : { "valueType" : "url" }, "tags" : { "valueType" : "item" }, "user" : { "valueType" : "item" } }, "items" : [ { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2cbec912855d58b7684527239ad3d1666/inspo5", "tags" : [ "joint","Dynamics","Tibia-metatarsus","Drag","Aspect","Semi-hydraulic","Hemolymph","Muscle","leg","ratio" ], "intraHash" : "cbec912855d58b7684527239ad3d1666", "interHash" : "c85ede589b7a13caabc8c25fa8520592", "label" : "Semi-hydraulic actuation in spider legs: The transport of the hemolymph does not hamper muscle driven leg joint flexion", "user" : "inspo5", "description" : "", "date" : "2025-12-18 11:27:05", "changeDate" : "2025-12-18 11:27:05", "count" : 2, "pub-type": "article", "journal": "Journal of Theoretical Biology","publisher":"Elsevier BV", "year": "2025", "url": "http://dx.doi.org/10.1016/j.jtbi.2025.112350", "author": [ "Reinhard Blickhan","Tobias Siebert","Tom Weihmann" ], "authors": [ {"first" : "Reinhard", "last" : "Blickhan"}, {"first" : "Tobias", "last" : "Siebert"}, {"first" : "Tom", "last" : "Weihmann"} ], "editor": [ "Tobias Siebert" ], "editors": [ {"first" : "Tobias", "last" : "Siebert"} ], "pages": "112350","abstract": "Hemolymph channels (lacunae) in the legs of spiders are part of their open circulatory system. They are defined as hemolymph-filled spaces between tissues within the exoskeletal tubes of the legs which are otherwise largely filled with muscles. In two of the major leg joints, the leg segments are connected via hinge joints with axes that are located at their dorsal rims.\r\nThe lacunae are used to channel hemolymph, which acts as a hydraulic fluid, to the extensor-less joints during the extension of the legs. However, due to competing optimization criteria of muscle-driven flexion and drainage of the hemolymph, fluid drag in the lacunae may hinder movement and force generation during flexion. Numerical modelling of dynamic flexions of the tibia-metatarsus joint, considering anatomical and physiological properties identified in the hunting spider Cupiennius salei, was used to investigate the trade-off between muscular force and hemolymph-drainage. The results showed that the diameters of the hemolymph channels exhibit a broad optimum for quick flexion. Within a wide range of channel diameters flexion times are hardly affected. Muscle properties, especially the time of muscle activation, strongly dampen the effect of the reduced muscle cross-section available. With small loads of 0.1\u202Fg, similar to the spiders\u2019 common prey size, the radius of the observed effective lacunae seems to enable the fastest flexions. A change in the aspect ratio of the tibia while maintaining the proportionality of its radius and the radius of the effective hemolymph channels leads to an extension of the flexion time.", "issn" : "0022-5193", "doi" : "10.1016/j.jtbi.2025.112350", "bibtexKey": "Blickhan_2025" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2776785bd941f4b566ad6f7720e8f5593/mariawirzberger", "tags" : [ "myown","ChatGPT","dynamics","simulation","workload","workplace","trust" ], "intraHash" : "776785bd941f4b566ad6f7720e8f5593", "interHash" : "de14d5534491162c36e097186f529e82", "label" : "Simulation and ChatGPT: Large language models as tools for model analysis", "user" : "mariawirzberger", "description" : "", "date" : "2025-09-14 12:19:27", "changeDate" : "2025-09-14 12:19:27", "count" : 6, "pub-type": "inproceedings", "booktitle": "Conference Proceedings for the 2024 System Dynamics Conference", "year": "2024", "url": "", "author": [ "Ivan Dula","Tabea Berberena","Ksenia Keplinger","Maria Wirzberger" ], "authors": [ {"first" : "Ivan", "last" : "Dula"}, {"first" : "Tabea", "last" : "Berberena"}, {"first" : "Ksenia", "last" : "Keplinger"}, {"first" : "Maria", "last" : "Wirzberger"} ], "bibtexKey": "dula2024simulation" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2dd555a4fd35faa41b3f9a475802f1084/inspo5", "tags" : [ "joint","moment","muscle-tendon","dynamics","gearing","locomotion","muscle","sound","ultra","force","enhancement" ], "intraHash" : "dd555a4fd35faa41b3f9a475802f1084", "interHash" : "16909b6df8a0d1c17a291e8e0cb7eaf7", "label" : "Decoupling of muscle-tendon unit and fascicle velocity contributes to the in vivo stretch-shortening cycle effect in the male human triceps surae muscle", "user" : "inspo5", "description" : "", "date" : "2024-12-19 16:12:00", "changeDate" : "2024-12-19 16:12:00", "count" : 2, "pub-type": "article", "journal": "The Physiological Society", "year": "2024", "url": "https://physoc.onlinelibrary.wiley.com/doi/10.14814/phy2.70131", "author": [ "Denis Holzer","Daniel Hahn","Ansgar Schwirtz","Tobias Siebert","Wolfgang Seiberl" ], "authors": [ {"first" : "Denis", "last" : "Holzer"}, {"first" : "Daniel", "last" : "Hahn"}, {"first" : "Ansgar", "last" : "Schwirtz"}, {"first" : "Tobias", "last" : "Siebert"}, {"first" : "Wolfgang", "last" : "Seiberl"} ], "editor": [ "Tobias Siebert" ], "editors": [ {"first" : "Tobias", "last" : "Siebert"} ], "volume": "12","number": "23","pages": "e70131","abstract": "During the shortening of stretch-shortening cycles (SSCs), muscle force output is enhanced compared with pure shortening (SHO), referred to as the SSC-effect. In general, muscle-tendon unit (MTU), muscle belly, muscle fascicle, and tendon length changes can be decoupled during contraction, which affects force generation and elastic recoil. We researched whether MTU decoupling contributes to the SSC-effect. Participants performed electrically stimulated submaximal fixed-end, SSC, and SHO plantar-flexions on a dynamometer at two velocities (40, 120°/s) and two ranges of motion (15, 25°). Fascicle and tendon length changes of the gastrocnemius medialis, and ankle joint kinematics were assessed by ultrasound and motion capture, respectively. During SSC shortening, ankle joint torque and work, MTU force and work, and fascicle force were increased by 12%\u201322% compared with SHO, confirming a SSC-effect. Further, fascicle length change and velocity during SSCs were significantly reduced compared with SHO condition, and SSC fascicle work was decreased by ~35%. Our results indicate that MTU decoupling leads to a reduction in fascicle shortening amplitude and velocity, thereby increasing the muscle's force capacity while reducing its work output during SSC shortening. MTU decoupling therefore contributes to the SSC-effect and underlines the limited transferability of joint work measurements to estimated muscle work.", "language" : "English", "doi" : "10.14814/phy2.70131", "bibtexKey": "holzer2024decoupling" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/20b8a2822ba7baaca10669289c107bd9c/inspo5", "tags" : [ "dynamics","muscle","work","mechanical","damping","intrinsic","stiffness","properties" ], "intraHash" : "0b8a2822ba7baaca10669289c107bd9c", "interHash" : "a826d07e2f8c83bb1b8a903cbbcccde6", "label" : "Muscle preflex response to perturbations in locomotion: In vitro experiments and simulations with realistic boundary conditions", "user" : "inspo5", "description" : "", "date" : "2023-05-16 10:24:04", "changeDate" : "2023-05-16 10:24:04", "count" : 1, "pub-type": "article", "journal": "Frontiers in Bioengineering and Biotechnology", "year": "2023", "url": "https://www.frontiersin.org/articles/10.3389/fbioe.2023.1143926/full", "editor": [ "Tobias Siebert" ], "editors": [ {"first" : "Tobias", "last" : "Siebert"} ], "volume": "11","abstract": "Musculoskeletal disorders (MSD) are a widespread problem, often regarding the lumbar region. Exoskeletons designed to support the lower back could be used in physically demanding professions with the intention of reducing the strain on the musculoskeletal system, e.g., by lowering task-related muscle activation. The present study aims to investigate the effect of an active exoskeleton on back muscle activity when lifting weights. Within the framework of the study, 14 subjects were asked to lift a 15 kg box with and without an active exoskeleton which allows the adjustment of different levels of support, while the activity of their M. erector spinae (MES) was measured using surface electromyography. Additionally, the subjects were asked about their overall rating of perceived exertion (RPE) during lifting under various conditions. Using the exoskeleton with the maximum level of support, the muscle activity was significantly lower than without exoskeleton. A significant correlation was found between the exoskeleton\u2019s support level and the reduction of MES activity. The higher the support level, the lower the observed muscle activity. Furthermore, when lifting with the maximum level of support, RPE was found to be significantly lower than without exoskeleton too. A reduction in the MES activity indicates actual support for the movement task and might indicate lower compression forces in the lumbar region. It is concluded that the active exoskeleton supports people noticeably when lifting heavy weights. Exoskeletons seem to be a powerful tool for reducing load during physically demanding jobs and thus, their use might be helpful in lowering the risk of MSD.", "language" : "English", "doi" : "10.3389/fbioe.2023.1143926", "bibtexKey": "siebert2023muscle" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2cf82c2cba53516e9630c31dbf5760ea5/inspo5", "tags" : [ "biomechanics","analysis","endurance","estimation","fatigue","optimization","dynamics","parameter","sensitivity","time","first-order" ], "intraHash" : "cf82c2cba53516e9630c31dbf5760ea5", "interHash" : "f9d277a1e8c689ed9606efdfca787b8f", "label" : "Exhaustion of Skeletal Muscle Fibers Within Seconds: Incorporating Phosphate Kinetics Into a Hill-Type Model", "user" : "inspo5", "description" : "", "date" : "2022-07-19 11:10:29", "changeDate" : "2022-07-19 09:10:56", "count" : 2, "pub-type": "article", "journal": "Frontiers in Physiology","publisher":"Frontiers Media SA", "year": "2020", "url": "https://doi.org/10.3389%2Ffphys.2020.00306", "author": [ "Robert Rockenfeller","Michael Günther","Norman Stutzig","Daniel F. B. Haeufle","Tobias Siebert","Syn Schmitt","Kay Leichsenring","Markus Böl","Thomas Götz" ], "authors": [ {"first" : "Robert", "last" : "Rockenfeller"}, {"first" : "Michael", "last" : "Günther"}, {"first" : "Norman", "last" : "Stutzig"}, {"first" : "Daniel F. B.", "last" : "Haeufle"}, {"first" : "Tobias", "last" : "Siebert"}, {"first" : "Syn", "last" : "Schmitt"}, {"first" : "Kay", "last" : "Leichsenring"}, {"first" : "Markus", "last" : "Böl"}, {"first" : "Thomas", "last" : "Götz"} ], "editor": [ "Tobias Siebert" ], "editors": [ {"first" : "Tobias", "last" : "Siebert"} ], "volume": "11", "doi" : "10.3389/fphys.2020.00306", "bibtexKey": "Rockenfeller_2020" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29d530f5c074dc9af0e1c475c6ea3ca48/inspo5", "tags" : [ "sonography","dynamics","muscle","load","transverse","contraction","architecture","compression","ultrasound" ], "intraHash" : "9d530f5c074dc9af0e1c475c6ea3ca48", "interHash" : "7bc93b91d4afa86288032a24d5ee4708", "label" : "The Effect of Multidirectional Loading on Contractions of the M. Medial Gastrocnemius", "user" : "inspo5", "description" : "", "date" : "2022-07-19 11:10:29", "changeDate" : "2022-07-19 09:10:56", "count" : 2, "pub-type": "article", "journal": "Frontiers in Physiology","publisher":"Frontiers Media SA", "year": "2021", "url": "https://doi.org/10.3389%2Ffphys.2020.601799", "author": [ "David S. Ryan","Norman Stutzig","Andreas Helmer","Tobias Siebert","James M. Wakeling" ], "authors": [ {"first" : "David S.", "last" : "Ryan"}, {"first" : "Norman", "last" : "Stutzig"}, {"first" : "Andreas", "last" : "Helmer"}, {"first" : "Tobias", "last" : "Siebert"}, {"first" : "James M.", "last" : "Wakeling"} ], "editor": [ "Tobias Siebert" ], "editors": [ {"first" : "Tobias", "last" : "Siebert"} ], "volume": "11", "doi" : "10.3389/fphys.2020.601799", "bibtexKey": "Ryan_2021" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/21c85bdf11cbecb538cd5edf98a8597dd/inspo5", "tags" : [ "Biomechanics","Nonlinear","Animal","dynamics","Bioenergetics","behaviour" ], "intraHash" : "1c85bdf11cbecb538cd5edf98a8597dd", "interHash" : "043bc2c5e9b044a62a58167156c7fcb0", "label" : "Cross-bridge mechanics estimated from skeletal muscles' work-loop responses to impacts in legged locomotion", "user" : "inspo5", "description" : "", "date" : "2022-07-19 11:10:29", "changeDate" : "2022-07-19 09:10:56", "count" : 2, "pub-type": "article", "journal": "Scientific Reports", "year": "2021", "url": "https://doi.org/10.1038/s41598-021-02819-6", "author": [ "Kasper B. Christensen","Michael Günther","Syn Schmitt","Tobias Siebert" ], "authors": [ {"first" : "Kasper B.", "last" : "Christensen"}, {"first" : "Michael", "last" : "Günther"}, {"first" : "Syn", "last" : "Schmitt"}, {"first" : "Tobias", "last" : "Siebert"} ], "editor": [ "Tobias Siebert" ], "editors": [ {"first" : "Tobias", "last" : "Siebert"} ], "volume": "11","number": "1","pages": "23638","abstract": "Legged locomotion has evolved as the most common form of terrestrial locomotion. When the leg makes contact with a solid surface, muscles absorb some of the shock-wave accelerations (impacts) that propagate through the body. We built a custom-made frame to which we fixated a rat (Rattus norvegicus, Wistar) muscle (m. gastrocnemius medialis and lateralis: GAS) for emulating an impact. We found that the fibre material of the muscle dissipates between 3.5 and \\$\\$23\\backslash,\\backslashupmu \\backslashhbox \\J\\\\$\\$ranging from fresh, fully active to passive muscle material, respectively. Accordingly, the corresponding dissipated energy in a half-sarcomere ranges between 10.4 and \\$\\$68\\backslash,z\\backslashhbox \\J\\\\$\\$, respectively. At maximum activity, a single cross-bridge would, thus, dissipate 0.6\\% of the mechanical work available per ATP split per impact, and up to 16\\% energy in common, submaximal, activities. We also found the cross-bridge stiffness as low as \\$\\$2.2\\backslash,\\backslashhbox \\pN\\\\backslash,\\backslashhbox \\nm\\^\\-1\\\\$\\$, which can be explained by the Coulomb-actuating cross-bridge part dominating the sarcomere stiffness. Results of the study provide a deeper understanding of contractile dynamics during early ground contact in bouncy gait.", "issn" : "2045-2322", "doi" : "10.1038/s41598-021-02819-6", "bibtexKey": "Christensen2021" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2290e83f7679a56cea357e23a63fcd3b7/philipptempel", "tags" : [ "cable-driven","modeling","dynamics","simulation","cable-robot","kinematics","preprint","multibody" ], "intraHash" : "290e83f7679a56cea357e23a63fcd3b7", "interHash" : "0235a16817121cee31189d399dc61d09", "label" : "Modeling of Elastic-Flexible Cables with Time-Varying Length for Cable-Driven Parallel Robotsj", "user" : "philipptempel", "description" : "", "date" : "2019-01-26 14:43:22", "changeDate" : "2019-01-26 13:43:22", "count" : 1, "pub-type": "inproceedings", "booktitle": "Proceedings of the Fourth International Conference on Cable-Driven Parallel Robots","series": "Advances in Mechanism and Machine Science","publisher":"Springer Switzerland", "year": "2019", "url": "", "author": [ "Philipp Tempel","Dongwon Lee","Felix Trautwein","Andreas Pott" ], "authors": [ {"first" : "Philipp", "last" : "Tempel"}, {"first" : "Dongwon", "last" : "Lee"}, {"first" : "Felix", "last" : "Trautwein"}, {"first" : "Andreas", "last" : "Pott"} ], "editor": [ "Andreas Pott","Tobias Bruckmann" ], "editors": [ {"first" : "Andreas", "last" : "Pott"}, {"first" : "Tobias", "last" : "Bruckmann"} ], "note": "submitteed", "bibtexKey": "Tempel.2019" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/269175cf74d114807d724b8d25d58dbee/philipptempel", "tags" : [ "myown","cable-driven","dynamics","cable-robot","kinematics" ], "intraHash" : "69175cf74d114807d724b8d25d58dbee", "interHash" : "ef911aee8b063c3ad72c6b05aabe7070", "label" : "SimTech Milestone Report: Improved Modeling of Cables for Kinematics and Dynamics of Cable-driven Parallel Robots", "user" : "philipptempel", "description" : "", "date" : "2015-12-08 08:42:21", "changeDate" : "2016-03-09 10:41:39", "count" : 2, "pub-type": "techreport", "year": "2015", "url": "", "author": [ "Philipp Tempel" ], "authors": [ {"first" : "Philipp", "last" : "Tempel"} ], "bibtexKey": "tempel2015simtech" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/26dfb1c595dcdf07dd90a840143f650ce/philipptempel", "tags" : [ "myown","cable-driven","modeling","parallel","dynamics","cable-robot","kinematics","robots" ], "intraHash" : "6dfb1c595dcdf07dd90a840143f650ce", "interHash" : "890242751b3b4f431fbeb708e4d61efc", "label" : "Modelling of Kinematics and Dynamics of the IPAnema 3 Cable Robot for Simulative Analysis", "user" : "philipptempel", "description" : "", "date" : "2015-11-05 17:29:03", "changeDate" : "2016-03-09 10:41:39", "count" : 8, "pub-type": "article", "journal": "AMM","publisher":"Trans Tech Publications", "year": "2015", "url": "http://dx.doi.org/10.4028/www.scientific.net/AMM.794.419", "author": [ "Philipp Tempel","Philipp Miermeister","Armin Lechler","Andreas Pott" ], "authors": [ {"first" : "Philipp", "last" : "Tempel"}, {"first" : "Philipp", "last" : "Miermeister"}, {"first" : "Armin", "last" : "Lechler"}, {"first" : "Andreas", "last" : "Pott"} ], "volume": "794","pages": "419--426", "doi" : "10.4028/www.scientific.net/amm.794.419", "bibtexKey": "Tempel_2015" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a548f40a68a487e59ca8a2324a074462/philipptempel", "tags" : [ "myown","cable-driven","modeling","parallel","dynamics","cable-robot","kinematics","robots" ], "intraHash" : "a548f40a68a487e59ca8a2324a074462", "interHash" : "41c9eb2026b6b2316d264b040956d509", "label" : "Kinematics and Dynamics Modeling for Real-Time Simulation of the Cable-Driven Parallel Robot IPAnema 3", "user" : "philipptempel", "description" : "", "date" : "2015-11-05 17:27:00", "changeDate" : "2016-03-09 10:41:39", "count" : 7, "pub-type": "article", "journal": "Proceedings of the 14th IFToMM World Congress","publisher":"國立臺灣大學機械系", "year": "2015", "url": "", "author": [ "Philipp Tempel","Philipp Miermeister","Andreas Pott" ], "authors": [ {"first" : "Philipp", "last" : "Tempel"}, {"first" : "Philipp", "last" : "Miermeister"}, {"first" : "Andreas", "last" : "Pott"} ], "number": "14th-2","pages": "117-123","abstract": "In this paper, the kinematics and dynamics modeling of the mechatronic model for a 6 DOF cable-driven parallel robot are covered and a real-time capable simulation model for such robots is derived. The governing equations of motion of the mobile platform are acquired using Newton-Euler formalism, furthermore, the pulley kinematics of the winches and a spring-damper based cable model are introduced. Once the equations of motion are derived, closed-form force distribution is implemented and simulation results of the real-time capable model for the cable-driven parallel robot IPAnema 3 is presented. Given the real-time capability, the established model can be used for hardware-in-the-loop simulation or controller design, but also for case studies of highly dynamic or large-scale robots.", "language" : "英文", "doi" : "10.6567/IFToMM.14TH.WC.OS4.020", "bibtexKey": "AL:P20150909001-201510-201510280027-201510280027-117-123" } ] }