Multi Domain Modeling of NVH for Electro-Mechanical Drives

Kolluru, Yashwant; Doelling, Rolando; Hedrich, Lars

doi:10.4271/2020-01-1584

Cited by 2 publications

(4 citation statements)

References 16 publications

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“…The terms u, M, , K, , , and indicate the displacement of housing, mass of the housing, mass of the fluid/ air, mass of the fluid structure interface, stiffness of the structure, stiffness matrix of fluid, stiffness matrix of fluid structure interface, force applied by the structure and force exerted by the air respectively. Detailed information about the coupling finite element models can be found in papers [22,23].…”

Section: Fluid Structure Couplingmentioning

confidence: 99%

“…Considering the necessary complexities within the modeling technique enables the user to build a model that is close to reality. Detailed information regarding the simulation templates with analyses at multiple domains, such as the Lumped Parameter Model (LPM), Multi-Body Dynamics (MBD), etc., can be found in papers [1,23]. The rotation of the toothed shafts and gears would cause transmission errors that lead to vibrations in the structure.…”

Section: Development Of the Numerical Modelmentioning

confidence: 99%

“…Damping is the diminution, restriction or prevention of the vibrations. To achieve this, damping elements are introduced to the systems; the addition of these make the power unit more efficient and provide a better ride comfort [23]. When a damped structure, which is initially at rest, is excited with a harmonic load, it has a transient response at first which then fades out quickly.…”

Section: Vibro-acoustic Templatementioning

confidence: 99%

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Design and Optimization of a Three Stage Electromechanical Power Unit using Numerical Methods

Kolluru¹,

Doelling²,

Hedrich³

2020

Adv. sci. technol. eng. syst. j.

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The advent of electric vehicles has changed the face of the automobile industry. The drive system properties of vehicles such as eBikes or electric cars differ fundamentally from those of a diesel engine. The lack of a conventional internal combustion engine has made the vehicles considerably silent. Nevertheless, previously hidden sources of vibration and noise have become more dominant. In addition to these emissions, other structural properties such as compliance and deformation also appear as relevant factors for the original equipment manufacturer. Usually, deterioration of these variables affects the efficiency of the power unit. In this paper, a simulation template is created to understand and analyze these properties of the drive unit. Furthermore, new enhancements to improve the key indicators, such as strain energy, natural frequencies, etc., are shown, thereby creating a potential method flow to develop better performing drive units. Numerical optimization tools are used to simulate structures with complex shapes that exactly meet the mechanical constraints and use as little material as possible. In this work, two optimized variants of electromechanical drives are presented. The first scenario illustrates the optimized model with an objective of minimizing the strain energy of the structures, whereas the second task aids in the development of a variant with superior dynamic properties than the current drive units. Ultimately, several numerical calculations are validated using experiments.

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Section: Fluid Structure Couplingmentioning

confidence: 99%

Section: Development Of the Numerical Modelmentioning

confidence: 99%

Section: Vibro-acoustic Templatementioning

confidence: 99%

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Design and Optimization of a Three Stage Electromechanical Power Unit using Numerical Methods

Kolluru¹,

Doelling²,

Hedrich³

2020

Adv. sci. technol. eng. syst. j.

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“…A respective flow is chosen based on critical aspects like accuracy, speed, complexities in design etc. Furthermore, within the diagram, reference to corresponding section of the respective model component is also shown in paper[KDH20b].…”

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confidence: 99%

Generic methodology for modeling and simulation of vibration, wear and noise in electromechanical drivetrains

Kolluru¹

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This work describes development of a comprehensive methodology for analyzing vibro-acoustic and wear mechanisms in transmission systems. The thesis addresses certain gaps present in the fields of structure dynamics and abrasion mechanism and opens new areas for further research. The paper attempts to understand new and relatively unexplored challenges like influences of wear on the dynamics of drive train. It also focuses on developing new techniques for analyzing the vibration and acoustic behavior of the drive unit structures and surrounding fluids respectively. The developed methodology meets the requirements of both the complete system and component level modeling by using specially identified combination of different simulation techniques. Based on the created template model, a three-stage spur plus helical gearbox is constructed and simulated as an application example. In addition to the internal mechanical excitation mechanisms, the transmission model also includes the rotational and translational dynamics of the gears, shafts and bearings. It is followed by illustration of wear among the rotating components. Different kinds of static and dynamic analyses are performed and coupled at various levels depending on the mechanical complexities involved. Furthermore, the structure dynamic vibration of the housing and the associated sound particle radiations are mapped into the surrounding fluid. Additionally, the approach for selection of the potential parameters for optimization is depicted. Final part focuses on the measurements of different system states used for validation of the model. In the end, results obtained from both simulations and experiments are analyzed and assessed for there respective performances.

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Multi Domain Modeling of NVH for Electro-Mechanical Drives

Cited by 2 publications

References 16 publications

Design and Optimization of a Three Stage Electromechanical Power Unit using Numerical Methods

Design and Optimization of a Three Stage Electromechanical Power Unit using Numerical Methods

Generic methodology for modeling and simulation of vibration, wear and noise in electromechanical drivetrains

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