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Vehicles
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Rotordynamics in Automotive Engineering
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Rotordynamics in Automotive Engineering

A special issue of Vehicles (ISSN 2624-8921).

Deadline for manuscript submissions: closed (25 March 2024) | Viewed by 12775

Special Issue Editors

Prof. Dr. Jerzy T. Sawicki

E-Mail Website
Guest Editor
Center for Rotating Machinery Dynamics and Control (RoMaDyC), Cleveland State University, Cleveland, OH 44115, USA
Interests: mechanical vibration and control; rotordynamics; structural health monitoring; magnetic bearings; mechatronic systems
Prof. Dr. Athanasios Chasalevris

E-Mail Website
Co-Guest Editor
School of Mechanical Engineering, National Technical University of Athens, 15780 Athens, Greece
Interests: dynamics of machines and mechanisms; tribology and lubrication; adjustable bearings; nonlinear dynamics of rotating systems; turbomachinery rotordynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Progress in engine and powertrain technologies within automotive engineering is mainly driven by trends related to electric drives, hydrogen power, and environmental concerns. The advances are primarily correspond to efficiency of mechanical layouts, downsizing, energy requirements, and environmental footprints. Passenger cars and commercial vehicles raise engineering problems that are subject to changing standards regarding environmental restrictions, power sources, and customer needs. Alternative solutions are sought via multiphysical models, advanced physics, oil-free technology, including gas lubrication and biolubricants, and smart features in machine components, including smart materials.

For this Special Issue of Vehicles entitled “Rotordynamics in Automotive Engineering”, we are seeking original contributions related to emerging trends in the dynamics of rotating machines in automotive applications. Specific topics of include but are not limited to new rotor dynamic concepts in engines and electric motors, fuel cell air supply, and power transmission or peripherals, including gear dynamics and ball bearings, with regard to the aforementioned emerging trends.

Prof. Dr. Jerzy T. Sawicki
Dr. Athanasios Chasalevris
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Vehicles is an international peer-reviewed open access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • multiphysical rotor dynamic models
  • oil free lubrication
  • hydrogen power
  • electric drive
  • fuel cell air supply
  • ball bearings
  • biolubricants
  • smart components

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Published Papers (3 papers)

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Research

15 pages, 4207 KiB  
Article
Modelling and Simulation of Aerodynamic Cylindrical Bearings Using ANSYS Hydrodynamic Bearing Element Types
by Katrin Baumann and Hermann Freund
Vehicles 2023, 5(3), 1118-1132; https://doi.org/10.3390/vehicles5030061 - 4 Sep 2023
Cited by 2 | Viewed by 1951
Abstract
Modern power engine concepts and environmental restrictions demand oil-free lubrication of rotors, for example, by gas bearings. However, the stiffness and damping properties ruling the rotor’s dynamics are poorly documented for aerodynamic bearings and simple calculation methods are lacking. Based on the similarity [...] Read more.
Modern power engine concepts and environmental restrictions demand oil-free lubrication of rotors, for example, by gas bearings. However, the stiffness and damping properties ruling the rotor’s dynamics are poorly documented for aerodynamic bearings and simple calculation methods are lacking. Based on the similarity between aerodynamic and hydrodynamic journal bearings, it is investigated to what extent the hydrodynamic bearing element types of the commercial FE program ANSYS are also suitable for air bearings. Within these elements, the compressibility of the gas is neglected. After verification of the ANSYS hydrodynamic element types with literature data for cylindrical hydrodynamic bearings, the stiffness and damping coefficients of a cylindrical aerodynamic bearing are calculated by using the ANSYS hydrodynamic element types. In the examined speed range, the results agree well with literature data that consider gas compressibility. Therefore, the FE elements designed for hydrodynamical journal bearings may also be used for simulating cylindrical aerodynamic bearings. The presented calculation approach provides a compact and easy-to-use method for rotordynamic simulations with cylindrical aerodynamic bearings in a single development environment. Full article
(This article belongs to the Special Issue Rotordynamics in Automotive Engineering)
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14 pages, 5051 KiB  
Article
Stick–Slip Characteristic Analysis of High-Speed Train Brake Systems: A Disc–Block Friction System with Different Friction Radii
by Changlin Lu, Quan Wang, Zhiwei Wang, Jiliang Mo, Song Zhu and Wenwei Jin
Vehicles 2023, 5(1), 41-54; https://doi.org/10.3390/vehicles5010003 - 2 Jan 2023
Cited by 4 | Viewed by 2927
Abstract
Inspired by the difference in the friction radii of the pads from the high-speed train brake system, stick–slip experiments for a disc–block friction system with different friction radii were carried out via a test device. Based on the test results, the stick–slip vibration [...] Read more.
Inspired by the difference in the friction radii of the pads from the high-speed train brake system, stick–slip experiments for a disc–block friction system with different friction radii were carried out via a test device. Based on the test results, the stick–slip vibration characteristics of the disc–block friction system with variation in the friction radius were analyzed, and the corresponding Stribeck model parameters in exponential and fractional forms were identified. The experimental results show that with an increase in the friction radius the vibration amplitude first increased and then decreased and the frequency of stick–slip vibration increased. The identified Stribeck model parameters show that the decay factors increased, the static friction coefficient decreased, and the dynamic friction coefficient decreased first and then increased as the friction radius increased. Moreover, the identified Stribeck model in an exponential form can more accurately reflect the stick–slip characteristics of a disc–block friction system than the model in a fractional form. It can be further applied in the investigation of the dynamic behaviors of high-speed train brake systems. Full article
(This article belongs to the Special Issue Rotordynamics in Automotive Engineering)
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16 pages, 3657 KiB  
Article
NVH Optimization Analysis of Permanent Magnet Synchronous Motor by Rotor Slotting
by Yongchao Wang, Hui Gao, Haiyang Wang and Wenpeng Ma
Vehicles 2020, 2(2), 287-302; https://doi.org/10.3390/vehicles2020016 - 20 May 2020
Cited by 20 | Viewed by 6380
Abstract
With the development of new energy vehicles, the NVH (Noise, Vibration, Harshness) performance of the permanent magnet synchronous motors (PMSM) for vehicles has attracted more and more attention. The rotor slotting optimization analysis is the critical issue in the NVH performance study of [...] Read more.
With the development of new energy vehicles, the NVH (Noise, Vibration, Harshness) performance of the permanent magnet synchronous motors (PMSM) for vehicles has attracted more and more attention. The rotor slotting optimization analysis is the critical issue in the NVH performance study of PMSM. In this paper, the theoretical formula of the PMSM radial electromagnetic force is presented. Based on which, the spatial order and frequency order characteristics of the radial force of a 6-pole 36-slot PMSM are analyzed. Firstly, electromagnetic simulation of the motor is carried out, and the specific force components, which may cause an NVH problem, is extracted. Secondly, the harmonics are calculated with a method of freezing the relative magnetic permeability. Thirdly, the motor is optimized by rotor slotting to reduce the amplitudes of these harmonics, and the effect on electromagnetic noise is analyzed in theory and simulation. Finally, the NVH test in original state and after rotor slotting state was performed in the semi-anechoic chamber. The accuracy of the theory and simulation was verified based on the comparison of the measured noise data. This paper provides a new NVH optimization idea, this method can quickly locate the fundamental problem location of electromagnetic NVH, provide a fast channel for electromagnetic NVH optimization from simulation to verification, and improve the optimization efficiency of NVH. Full article
(This article belongs to the Special Issue Rotordynamics in Automotive Engineering)
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