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Papers by Guglielmo Giannetti

Research paper thumbnail of Modelling and Experimental Study of Power Losses in Toothed Wheels

Sensors

In recent decades, the request for more efficient performances in the aeronautical sector moved r... more In recent decades, the request for more efficient performances in the aeronautical sector moved researchers to pay particular attention to all the related mechanisms and systems, especially with respect to the saving of power. In this context, the bearing modeling and design, as well as gear coupling, play a fundamental role. Moreover, the need for low power losses also concerns the study and the implementation of advanced lubrication systems, especially for high peripheral speed. With the previous aims, this paper presents a new validated model for toothed gears, added to a bearing model; with the link of these different submodels, the whole model describes the system’s dynamic behavior, taking into account the different kinds of power losses (windage losses, fluid dynamic losses, etc.) generated by the mechanical system parts (especially rolling bearings and gears). As the bearing model, the proposed model is characterized by high numerical efficiency and allows the investigation ...

Research paper thumbnail of PIJ882144 Supplemental Material1 - Supplemental material for Modeling and experimental study of power losses in a rolling bearing

Supplemental material, PIJ882144 Supplemental Material1 for Modeling and experimental study of po... more Supplemental material, PIJ882144 Supplemental Material1 for Modeling and experimental study of power losses in a rolling bearing by Guglielmo Giannetti, Enrico Meli, Andrea Rindi, Alessandro Ridolfi, Zhiyong Shi, Anna Tangredi, Bruno Facchini, Tommaso Fondelli and Daniele Massini in Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

Research paper thumbnail of PIJ882144 Supplemental Material2 - Supplemental material for Modeling and experimental study of power losses in a rolling bearing

Supplemental material, PIJ882144 Supplemental Material2 for Modeling and experimental study of po... more Supplemental material, PIJ882144 Supplemental Material2 for Modeling and experimental study of power losses in a rolling bearing by Guglielmo Giannetti, Enrico Meli, Andrea Rindi, Alessandro Ridolfi, Zhiyong Shi, Anna Tangredi, Bruno Facchini, Tommaso Fondelli and Daniele Massini in Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

Research paper thumbnail of Modeling and experimental study of power losses in a rolling bearing

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2019

Due to the growing demand for very high performance in aeronautical mechanisms and systems, parti... more Due to the growing demand for very high performance in aeronautical mechanisms and systems, particular attention must be paid on the bearing modeling and design. In this framework, a fundamental role is played by high peripheral speed and very low power losses. Looking toward this direction, this paper presents an improved model of rolling bearings able to describe the system dynamic behavior and the important effect of different kinds of power losses (friction losses, fluid dynamic losses, etc.). The proposed model is characterized by a high numerical efficiency and allows the investigation of the rolling bearing behavior both under transient and steady conditions. A comparison between the experimental and simulated results is also presented in this paper. The analysis of the results is encouraging and shows a good agreement between experiments and model simulations.

Research paper thumbnail of Efficient Flexible Multibody Models for Tilting Pad Journal Bearings

Machines

Tilting pad journal bearings (TPJBs) are key components in modern rotating machines. They require... more Tilting pad journal bearings (TPJBs) are key components in modern rotating machines. They require accurate modeling to describe their behavior, and we considered the thermo-elasto-hydrodynamic approach. Thermo-elasto-hydrodynamic (TEHD) models are a powerful tool for machine design and analysis, but they have to assure a good compromise between accuracy and numerical efficiency. Current multi-physics TEHD models of TPJBs are very accurate; however, their numerical efficiency is still far from being satisfying for industrial applications. To partially fill this gap, we propose an innovative modeling approach based on efficient flexible multibody techniques, such as the Floating Frame of Reference Formulation (FFRF) and some extensions that can be easily coupled with different fluid dynamic models to describe the whole TPJB. The model was tested on a real TPJB geometry and validated through experimental tests. The results are encouraging and show the effectiveness of the proposed appr...

Research paper thumbnail of Modelling and Experimental Study of Power Losses in Toothed Wheels

Sensors

In recent decades, the request for more efficient performances in the aeronautical sector moved r... more In recent decades, the request for more efficient performances in the aeronautical sector moved researchers to pay particular attention to all the related mechanisms and systems, especially with respect to the saving of power. In this context, the bearing modeling and design, as well as gear coupling, play a fundamental role. Moreover, the need for low power losses also concerns the study and the implementation of advanced lubrication systems, especially for high peripheral speed. With the previous aims, this paper presents a new validated model for toothed gears, added to a bearing model; with the link of these different submodels, the whole model describes the system’s dynamic behavior, taking into account the different kinds of power losses (windage losses, fluid dynamic losses, etc.) generated by the mechanical system parts (especially rolling bearings and gears). As the bearing model, the proposed model is characterized by high numerical efficiency and allows the investigation ...

Research paper thumbnail of PIJ882144 Supplemental Material1 - Supplemental material for Modeling and experimental study of power losses in a rolling bearing

Supplemental material, PIJ882144 Supplemental Material1 for Modeling and experimental study of po... more Supplemental material, PIJ882144 Supplemental Material1 for Modeling and experimental study of power losses in a rolling bearing by Guglielmo Giannetti, Enrico Meli, Andrea Rindi, Alessandro Ridolfi, Zhiyong Shi, Anna Tangredi, Bruno Facchini, Tommaso Fondelli and Daniele Massini in Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

Research paper thumbnail of PIJ882144 Supplemental Material2 - Supplemental material for Modeling and experimental study of power losses in a rolling bearing

Supplemental material, PIJ882144 Supplemental Material2 for Modeling and experimental study of po... more Supplemental material, PIJ882144 Supplemental Material2 for Modeling and experimental study of power losses in a rolling bearing by Guglielmo Giannetti, Enrico Meli, Andrea Rindi, Alessandro Ridolfi, Zhiyong Shi, Anna Tangredi, Bruno Facchini, Tommaso Fondelli and Daniele Massini in Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

Research paper thumbnail of Modeling and experimental study of power losses in a rolling bearing

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2019

Due to the growing demand for very high performance in aeronautical mechanisms and systems, parti... more Due to the growing demand for very high performance in aeronautical mechanisms and systems, particular attention must be paid on the bearing modeling and design. In this framework, a fundamental role is played by high peripheral speed and very low power losses. Looking toward this direction, this paper presents an improved model of rolling bearings able to describe the system dynamic behavior and the important effect of different kinds of power losses (friction losses, fluid dynamic losses, etc.). The proposed model is characterized by a high numerical efficiency and allows the investigation of the rolling bearing behavior both under transient and steady conditions. A comparison between the experimental and simulated results is also presented in this paper. The analysis of the results is encouraging and shows a good agreement between experiments and model simulations.

Research paper thumbnail of Efficient Flexible Multibody Models for Tilting Pad Journal Bearings

Machines

Tilting pad journal bearings (TPJBs) are key components in modern rotating machines. They require... more Tilting pad journal bearings (TPJBs) are key components in modern rotating machines. They require accurate modeling to describe their behavior, and we considered the thermo-elasto-hydrodynamic approach. Thermo-elasto-hydrodynamic (TEHD) models are a powerful tool for machine design and analysis, but they have to assure a good compromise between accuracy and numerical efficiency. Current multi-physics TEHD models of TPJBs are very accurate; however, their numerical efficiency is still far from being satisfying for industrial applications. To partially fill this gap, we propose an innovative modeling approach based on efficient flexible multibody techniques, such as the Floating Frame of Reference Formulation (FFRF) and some extensions that can be easily coupled with different fluid dynamic models to describe the whole TPJB. The model was tested on a real TPJB geometry and validated through experimental tests. The results are encouraging and show the effectiveness of the proposed appr...