@misc{13022, abstract = {{Numerous single-track railway lines are currently disused due to economic factors. These lines could potentially be reactivated by small vehicles that utilise only a single rail, enabling bidirectional operation simultaneously. The MONOCAB is such a compact monorail vehicle, stabilised by a system of control moment gyroscopes (CMGs) and a laterally movable, controllable trim mass. Despite their potential, there is currently a lack of comparative references for MONOCABs in relation to other vehicles. In the context of mechanical design and construction, interdependencies with roll stabilisation occur. Of particular concern are torsional effects, which can significantly impact stability. This study investigates the structural dynamics of monorail vehicles with a focus on the influence of gyroscopes. Gyroscopic systems play a significant role in the behaviour of such vehicles, affecting stability, control and response to external disturbances. Through a comprehensive approach encompassing analytical modelling, numerical simulations, and experimental validation, the interactions between the vehicle's structure and gyroscopic components are explored. The analytical considerations are validated via experimentally derived frequency responses utilising a full-scale monorail vehicle. The results of this study have implications for various fields, such as transportation, robotics and aerospace engineering.}}, author = {{Griese, Martin and Schulte, Thomas}}, booktitle = {{Vehicle system dynamics : international journal of vehicle mechanics and mobility}}, issn = {{1744-5159}}, keywords = {{Vehicle dynamics, rail vehicle, control moment gyroscope, stabilisation control, motion control, stability analysis}}, publisher = {{Taylor & Francis}}, title = {{{Gyroscopic effects in the structural dynamics of monorail vehicles}}}, doi = {{10.1080/00423114.2025.2480820}}, volume = {{63}}, year = {{2025}}, } @misc{12851, abstract = {{Currently, numerous single-track railway lines are disused due to economic reasons. They could be reactivated by small vehicles that use only one rail and thus can be operated in both directions at the same time. MONOCABs are such small cabin-like vehicles, stabilized by a system of control moment gyroscopes and a trim mass. They could make an important contribution to improve the mobility offer especially in rural areas. Regarding the MONOCAB, there is currently no reference in comparison with other vehicles. In the context of mechanical design and construction, interdependencies with vertical stabilization occur. Torsional effects in particular can critically affect the stability. This paper investigates the influence of mechanical eigenmodes on the vertical stabilization system. Specific characteristics of the system (especially due to the gyroscopes) are highlighted by a model-based analysis. Moreover, a FEM modal analysis is used to examine the supporting frame of the vehicle. The results are compared to experimentally estimated frequency responses of a full-scale monorail vehicle.}}, author = {{Griese, Martin and Döding, Patrick and Schulte, Thomas}}, booktitle = {{Advances in Dynamics of Vehicles on Roads and Tracks III : Proceedings of the 28th Symposium of the International Association of Vehicle System Dynamics, IAVSD 2023, August 21–25, 2023, Ottawa, Canada - Volume 1: Rail Vehicles }}, editor = {{Huang, Wei and Ahmadian, Mehdi }}, isbn = {{978-3-031-66970-5}}, issn = {{2195-4364}}, keywords = {{vehicle dynamics, roll stabilization, modal analysis}}, location = {{Ottawa, CANADA}}, pages = {{107--116}}, publisher = {{Springer Nature Switzerland}}, title = {{{Analysis of Mechanical Eigenmodes of a Self-stabilizing Monorail Vehicle}}}, doi = {{10.1007/978-3-031-66971-2_12}}, year = {{2024}}, } @misc{11306, abstract = {{Currently, numerous single-track railway lines are disused due to economic reasons. However, one way they could be reactivated for a bidirectional on-demand service traffic by small vehicles that use only one rail. MONOCABs are such small cabin-like vehicles, stabilized by a system of control moment gyroscopes and a trim mass. They could make an important contribution to improve the mobility offer especially in rural areas. Regarding the MONOCAB, there is currently no reference in comparison with other vehicles. It is mandatory to gain experience before transferring such a new vehicle concept into commercial operation. Especially the safe and robust commissioning of the stabilization control system is crucial and therefore requires an elaborated procedure. At this step, parameters related to the vertical dynamics have to be determined beforehand. This paper presents a comparative investigation of methods to estimate the moment of inertia and gravitational torque constant. Multiple methods in time-domain and frequency-domain are experimentally evaluated and compared with each other. Experimental tests are carried out with a full-scale monorail vehicle.}}, author = {{Griese, Martin and Mousavi, Seyed Davood and Schulte, Thomas}}, booktitle = {{2023 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)}}, isbn = {{978-1-6654-7634-8}}, issn = {{2159-6255}}, keywords = {{Parameter identification, Vehicle dynamics, Control moment gyroscope, Roll stabilization, Monorail vehicles}}, location = {{Seattle, Wash.}}, pages = {{1196--1201}}, publisher = {{IEEE}}, title = {{{Parameter identification related to vertical dynamic of a self-stabilizing monorail vehicle}}}, doi = {{10.1109/aim46323.2023.10196189}}, year = {{2023}}, } @misc{8380, abstract = {{Currently, numerous single-track railway lines are disused due to economic reasons. However, they could be reactivated for a bidirectional on-demand service traffic by small vehicles that use only one rail. MonoCabs are such small cabin-like vehicles, stabilized by a system of control moment gyroscopes and a moveable mass. They could make an important contribution to improve the mobility offer especially in rural areas. This paper is focused on the vertical stabilization system of the MonoCab. This system is discussed based on a physical three body model which describes the rolling motion of the vehicle, the lateral motion of the mass and the precession motion of the gyroscope. The model is utilized for a cascaded control concept adjusting the vehicle’s roll angle and gyroscope’s gimbal angle. The proposed stabilization concept is capable of compensating both high dynamic disturbances and stationary disturbances (e. g. unbalanced loads and steady wind flows). The concept is analyzed by simulations and experimental investigations utilizing a small scaled test rig and a rapid control prototyping system. Beside transient command responses also the frequency response of the system is experimentally evaluated and used for a validation of the model and theoretical findings.}}, author = {{Griese, Martin and Kottmeier, Fabian and Schulte, Thomas}}, booktitle = {{IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society}}, isbn = {{978-1-6654-3554-3}}, issn = {{2577-1647 }}, keywords = {{Vehicle dynamics, Control moment gyroscope, Control system analysis, Roll stabilization, Monorail vehicles}}, location = {{Toronto, ON, Canada }}, pages = {{pp. 1--6}}, publisher = {{IEEE}}, title = {{{Vertical control of a self-stabilizing monorail vehicle}}}, doi = {{10.1109/IECON48115.2021.9589726}}, year = {{2021}}, } @misc{8385, abstract = {{Currently, numerous single-track railway lines are disused due to economic reasons. However, they could be reactivated for a bidirectional on-demand service traffic by small vehicles that use only one rail. MonoCabs are such small cabin-like vehicles, stabilized by a system of control moment gyroscopes and a moveable mass. They could make an important contribution to improve the mobility offer especially in rural areas. This paper focuses on the analytical modeling and vertical stabilization system of the MonoCab. A nonlinear dynamic model is obtained using the Lagrangian method and subsequently linearized about its equilibrium point. Which is used for the design of the cascade control system. The dynamic analysis of the system is accomplished by comparing between analytically derived model in simulink environment and same structured model in simscape multibody. This system is discussed based on a physical three body model which describes the rolling motion of the vehicle, the lateral motion of the mass and the precession motion of the gyroscope. The model is utilized for a cascaded control concept adjusting the vehicle’s roll angle and gyroscope’s precession angle. The proposed stabilization concept is capable of compensating both high dynamic disturbances and stationary disturbances (e. g. unbalanced loads and steady wind flows). The concept is analyzed by simulations and experimental investigations. Beside transient command responses also the frequency response of the system is experimentally evaluated and used for a validation of the model and theoretical findings. For the experimental validation, a small scaled test rig is used which consists of mechanical frames and flywheels, inverter-fed drives, rotary encoders, an inertial measurement unit (IMU) and a rapid control prototyping system.}}, author = {{Griese, Martin and Mousavi, Seyed Davood and Schulte, Thomas}}, booktitle = {{2021 9th International Conference on Control, Mechatronics and Automation (ICCMA)}}, keywords = {{Vehicle dynamics, Control moment gyroscope, Control system analysis, Roll stabilization, Monorail vehicles}}, location = {{Belval, Luxembourg }}, pages = {{205--210}}, publisher = {{IEEE}}, title = {{{Modeling the Vertical Dynamics of a Self-stabilizing Monorail Vehicle}}}, doi = {{10.1109/ICCMA54375.2021.9646219}}, year = {{2021}}, }