Article
Mechanics
Thimothy Harold Gonsalves, Mohan Kumar Garje Channabasappa, Ramesh Motagondanahalli Rangarasaiah
Summary: The study presents the detailed rotor dynamic evaluation of a hybrid composite material rotating shaft, proposing the use of laminated composite material and hybrid metal fiber shaft to improve rotor dynamics in a power turbine high-speed rotor-bearing system. The combination of metal and fiber-reinforced material is found to effectively leverage the combined strengths of both materials, offering substantial rotor dynamic advantages compared to existing steel shafts.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2021)
Article
Computer Science, Information Systems
Banalata Bera, Chun-Ling Lin, Shyh-Chin Huang, Jin-Wei Liang, Po Ting Lin
Summary: Recently, prognostics and health management (PHM) has gained attention in industry for cost-effective maintenance and safe operation. Vibration-based predictive maintenance is crucial for diagnosing and predicting faults. This study presents a prognostic model using a mathematical model and statistical/machine learning methods to forecast future unbalance trend in a rotor-bearing system. The model is used to predict real-time unbalance values of an industrial turbine rotor for the next month. The proposed model is validated using data from a local plastic company and proves to accurately detect future system unbalance.
Article
Acoustics
Cristian Puerto-Santana, Carlos Ocampo-Martinez, Javier Diaz-Rozo
Summary: Mechanical unbalance is a significant cause of rotodynamic machinery malfunctions. Previous studies had drawbacks in detecting and monitoring unbalance, while the proposed approach utilizes data from vibration sensors and a rotation sensor to effectively detect and monitor unbalance conditions.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Rajiv Tiwari, Prabhat Kumar
Summary: The article describes a model-based identification algorithm based on virtual trial misalignment strategy for identifying rotor unbalance and residual misalignment of active magnetic bearing systems. This method is more reliable and effective than physical trial misalignment.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Thermodynamics
Chun-Ling Lin, Jin-Wei Liang, Yi-Mei Huang, Shyh-Chin Huang
Summary: In this paper, a novel model-based approach for monitoring and prognostics of rotor-bearing systems is introduced. The analytical method is used for rotor modeling and validated by an FEM model. The rotor-bearing model is validated using an operational turbine-bearing machine. The approach evaluates the unbalance optimization schemes in two phases and demonstrates the forecasting capability of unbalance.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Banalata Bera, Shyh-Chin Huang, Mohammad Najibullah, Chun-Ling Lin
Summary: Rotating machinery is a fundamental component in industrial frameworks, and effective prognostics and health management (PHM) are crucial for managing and sustaining these systems. Unbalanced faults are recognized as a significant factor in the development of faults in rotor-bearing systems, emphasizing the importance of monitoring and maintaining acceptable levels of unbalance. This paper presents an adaptive model-based approach for assessing unbalance faults in a rotor-bearing model and utilizes particle swarm optimization for parameter identification, demonstrating the superiority of this adaptive methodology.
Article
Engineering, Multidisciplinary
Prasad Shinde, Ramchandra G. Desavale
Summary: This paper introduces a combination of the matrix method of dimensional analysis (MMDA) and support vector machine (SVM) to investigate unbalance and misalignment in the rotor-bearing system. Experimental results show that this method can predict and classify these faults with acceptable error, making it useful for industrial high-speed machine diagnosis.
Article
Engineering, Multidisciplinary
Gyan Ranjan, Rajiv Tiwari, H. B. Nemade
Summary: A practical online balancing methodology for rotor systems supported on conventional bearings using an Active Magnetic Bearing (AMB) is proposed. The methodology eliminates the need for mechanical trial masses and estimates residual unbalances using an Improved Influence Coefficient Method (IICM).
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2022)
Article
Mechanics
Hanmant P. Phadatare, Barun Pratiher
Summary: This research article investigates the rotor-casing contact phenomena of a high-speed rotor-bearing system under mass unbalance, using a large deflection rotor-bearing model with a flexible shaft. The study develops a nonlinear mathematical model to explore steady-state stability, bifurcation, and chaos phenomena, revealing the effect of design parameters on system stability and sensitivity to chaotic responses.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Acoustics
Lei Li, Zhong Luo, Fengxia He, Kai Sun, Xiaolu Yan
Summary: This paper proposes a method for identifying the unbalance value of full-size rotor systems through scaling laws and scaled models. The effectiveness of the method is verified through numerical and experimental case studies, and the results show that the unbalance values can be accurately identified.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Nianxian Wang, Mingzheng Liu, Junfu Yao, Pingping Ge, Huachun Wu
Summary: The unbalance response of the magnetic suspended dual-rotor system (MSDS) considering nonlinear bearing characteristics of active magnetic bearings (AMBs) was predicted in this study. The nonlinear bearing model was established using a non-linear magnetic circuit method, and the dynamic model of the system was solved by the finite element method and the Newmark-beta method. The effects of external load, rotational speeds, and control parameters were studied, and the obtained results have important implications for the design and fault diagnosis of MSDSs.
Article
Engineering, Mechanical
Huihui Feng, Zhiwei Gao, Ron. A. J. Van Ostayen, Xiaofeng Zhang
Summary: The combined effects of working condition and groove texture on the dynamic characteristics and stability of a water-lubricated bearing-rotor system were investigated. The results show that shallower and longer groove textures improve the direct stiffness along the load direction, weaken the stiffness in the orthogonal direction, and decrease the unbalance response amplitude. However, an optimum groove width is needed to achieve the best dynamic performance.
Article
Automation & Control Systems
Mahboubeh Asadi Varnusfaderani, Mostafa Irannejad Parizi, Masoud Hemmatian, Abdolreza Ohadi
Summary: Magnetorheological fluid is an effective smart fluid used for vibration control. In this study, analytical tools and algorithms are presented for identifying the parameters of flexible rotor systems equipped with MR squeeze-film dampers. The developed algorithm and finite element model are shown to accurately identify the system parameters.
Article
Automation & Control Systems
Lei Gong, Changsheng Zhu
Summary: The study focused on suppressing synchronous unbalance vibration in active magnetic bearing systems using unbalance compensation strategies. A method utilizing a variable angle compensation algorithm to achieve real-time rotor position unbalance compensation was proposed to improve system stability and reduce vibrations.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Huijuan Zhang, Jianjuan Liu, Ruipu Zhu, Hongmei Chen, Hang Yuan
Summary: In this study, a nonlinear adaptive algorithm is proposed to suppress harmonic vibration in active magnetic bearing (AMB) system by changing the rotor speed, effectively distinguishing the frequencies of rotor unbalance (RUB) and sensor runout (SR) for correct compensation of displacement stiffness force. This method successfully attenuates harmonic vibration and stabilizes the AMB system.
IEEE SENSORS JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
A. D. Anoop, A. S. Sekhar, M. Kamaraj, K. Gopinath
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2018)
Article
Engineering, Aerospace
Sivakumar Subramanian, A. S. Sekhar, B. V. S. S. S. Prasad
INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES
(2018)
Article
Energy & Fuels
Sudhakar Gantasala, Jean-Claude Luneno, Jan-Olov Aidanpaa
Article
Engineering, Mechanical
N. Harish Chandra, A. S. Sekhar
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2018)
Article
Engineering, Mechanical
N. Rino Nelson, N. Siva Prasad, A. S. Sekhar
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2018)
Article
Engineering, Mechanical
Sagi Rathna Prasad, A. S. Sekhar
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2018)
Article
Engineering, Multidisciplinary
N. Harish Chandra, A. S. Sekhar
Article
Materials Science, Multidisciplinary
Pavani Udatha, A. S. Sekhar, R. Velmurugan
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2019)
Article
Engineering, Mechanical
S. Soorajkrishna, A. S. Sekhar, K. Shankar
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2019)
Article
Energy & Fuels
Narges Tabatabaei, Sudhakar Gantasala, Michel J. Cervantes
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2019)
Article
Energy & Fuels
Sudhakar Gantasala, Narges Tabatabaei, Michel Cervantes, Jan-Olov Aidanpaa
Proceedings Paper
Engineering, Mechanical
Sagi Rathna Prasad, A. S. Sekhar
PROCEEDINGS OF THE ASME TURBO EXPO: TURBOMACHINERY TECHNICAL CONFERENCE AND EXPOSITION, 2019, VOL 7A
(2019)
Proceedings Paper
Engineering, Industrial
Ch V. H. Gayatri, A. S. Sekhar
6TH INTERNATIONAL CONFERENCE ON MANUFACTURING, OPTIMIZATION, INDUSTRIAL AND MATERIAL ENGINEERING : MOIME18
(2018)
Proceedings Paper
Engineering, Mechanical
Ch V. H. Gayatri, A. S. Sekhar
PROCEEDINGS OF INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING (ISMA2018) / INTERNATIONAL CONFERENCE ON UNCERTAINTY IN STRUCTURAL DYNAMICS (USD2018)
(2018)
Article
Energy & Fuels
Sudhakar Gantasala, Jean-Claude Luneno, Jan-Olov Aidanpaa
Article
Acoustics
Sandip Chajjed, Mohammad Khalil, Dominique Poirel, Chris Pettit, Abhijit Sarkar
Summary: This paper reports the generalization of the Bayesian formulation of the flutter margin method, which improves the predictive performance by incorporating the joint prior of aeroelastic modal parameters. The improved algorithm reduces uncertainties in predicting flutter speed and can cut cost by reducing the number of flight tests.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pascal Zeise, Bernhard Schweizer
Summary: Air ring bearings are an improved version of classical air bearings, providing better damping behavior and allowing operation above the linear threshold speed of instability. However, there is a risk of dangerous vibrations in certain rotor systems, which can be addressed by considering ring tilting effects.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Zbynek Sika, Jan Krivosej, Tomas Vyhlidal
Summary: This paper presents a novel design of a compact six degrees of freedom active vibration absorber with six identical eigenfrequencies. The objective is to completely suppress the vibration of a machine structure with six motion components. By utilizing a Stewart platform structure equipped with six active legs, a spatial unifrequency absorber with six identical eigenfrequencies is achieved. The design is optimized using a correction feedback and active delayed resonator feedback.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kai Li, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel light-powered self-oscillating liquid crystal elastomer (LCE) bow that can self-oscillate continuously and periodically under steady illumination. The dynamics of the LCE bow are theoretically investigated and numerical calculations predict its motion regimes. The suggested LCE bow offers potential advantages in terms of simple structure, customizable size, flexible regulation, and easy assembly.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Carmelo Rosario Vindigni, Giuseppe Mantegna, Calogero Orlando, Andrea Alaimo
Summary: In this study, a simple adaptive flutter suppression system is designed to increase the operative speed range of a wing-aileron aeroelastic plant. The system achieves almost strictly passivity by using a parallel feed-forward compensator implementation and the controller parameters are optimized using a population decline swarm optimization algorithm. Numerical simulations prove the effectiveness of the proposed simple adaptive flutter suppression architecture in different flight scenarios.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Nicco Ulbricht, Alain Boldini, Peng Zhang, Maurizio Porfiri
Summary: The quantification of fluid-structure interactions in marine structures is crucial for their design and optimization. In this study, an analytical solution for the free vibration of a bidirectional composite in contact with a fluid is proposed. By imposing continuity conditions and boundary conditions, the coupled fluid-structure problem is solved and applied to sandwich structures in naval construction, offering insights into the effects of water on mode shapes and through-the-thickness profiles of displacement and stress.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Shahram Hadian Jazi, Mostafa Hadian, Keivan Torabi
Summary: Non-uniformity and damage are the main focus in studying vibrations of beam elements. An exact closed-form explicit solution for the transverse displacement of a nonuniform multi-cracked beam is introduced using generalized functions and distributional derivative concepts. By introducing non-dimensional parameters, the motion equation and its closed-form solution are obtained based on four fundamental functions. The impact of crack count, location, intensity, and boundary conditions on natural frequency and mode shape is evaluated through numerical study.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Eugenio Tramacere, Marius Pakstys, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Torbjoern A. Lembke
Summary: This paper proposes the experimental stabilization of electrodynamic maglev systems by means of passive components, providing key technological support for the Hyperloop concept of high-speed and sustainable transportation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pengfei Deng, Xing Tan, He Li
Summary: In this paper, the authors improve the surface morphology method and study the bit-rock interaction model between the rock and the PDC bit, taking into account the impact of blade shape and cutter arrangement. They establish a dynamic model for a deep drilling system equipped with an arbitrary shape PDC bit and propose a stability prediction method. The results show that the shape of the blades and arrangement of the cutters on the PDC bit significantly affect the nonlinear vibration of the drilling system.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Salvador Rodriguez-Blanco, Javier Gonzalez-Monge, Carlos Martel
Summary: In modern LPT designs, the simultaneous presence of forced response and flutter in different operation regimes is unavoidable. Recent evidence suggests that the traditional linear superposition method may be overly conservative. This study examines the flutter and forced response interaction in a realistic low pressure turbine rotor and confirms that the actual response is much smaller than that predicted by linear superposition.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kabilan Baskaran, Nur Syafiqah Jamaluddin, Alper Celik, Djamel Rezgui, Mahdi Azarpeyvand
Summary: This study investigates the impact of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers used in urban air mobility vehicles. The results show that different blade numbers exhibit distinct noise levels, providing valuable insights for further research on propeller noise and aerodynamic performance.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yongbo Peng, Peifang Sun
Summary: This study focuses on the reliability-based design optimization (RBDO) of the tuned mass-damper-inerter (TMDI) system under non-stationary excitations. The performance of the optimized TMDI system is evaluated using probability density evolution analysis. The results demonstrate the technical advantages of TMDI, including high vibration mitigation performance, considerable mass reduction, and less stroke demand.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Guanfu Lin, Zhong-Rong Lu, Jike Liu, Li Wang
Summary: Vision-based measurement is an emerging method that enables full-field measurement with non-contact and high spatial resolution capabilities. This paper presents a single-camera method for measuring out-of-plane vibration of plate structures using motion-parametric homography to capture image variation and displacement response.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Bronislaw Czaplewski, Mateusz Bocian, John H. G. Macdonald
Summary: Despite two decades of study, there is currently no model that can quantitatively explain pedestrian-generated lateral forces. This research proposes a foot placement control law based on empirical data to calibrate and generalize the rigid-leg inverted pendulum model (IPM) for predicting lateral structural stability.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Justine Carpentier, Jean-Hugh Thomas, Charles Pezerat
Summary: This paper proposes an improved method for the identification of vibration sources on a car window using the corrected force analysis technique. By redefining inverse methods in polar coordinates, more accurate results can be obtained.
JOURNAL OF SOUND AND VIBRATION
(2024)