Article
Engineering, Mechanical
Erik R. Gomez, Jakob Sjostrand, Leif Kari, Ines Lopez Arteaga
Summary: A study on the application of a nonlinear centrifugal pendulum vibration absorber with normal-force dependant friction loss in a downspeeded powertrain of a heavy-truck is conducted. The performance of the CPVA is affected by system dynamics, and downspeeding of the engine can reduce CO2 emissions but increase torsional vibration and noise, which can be mitigated by using CPVA.
MECHANISM AND MACHINE THEORY
(2022)
Article
Engineering, Electrical & Electronic
Junlong Qu, Wenku Shi, Juncheng Wang, Zhiyong Chen
Summary: This study investigates the influence of clutch nonlinear behaviors on the torsional vibration of the automotive driveline through numerical and experimental methods. The results show that adjusting the clutch parameters can effectively suppress the torsional vibration of the driveline system.
Article
Acoustics
Erik R. Gomez, Leif Kari, Ines Lopez Arteaga
Summary: A flywheel-mounted centrifugal pendulum absorber is designed to suppress the low-frequency shuffle-mode resonance of a heavy-duty truck powertrain. Linear analysis and nonlinear simulations are used to validate the design, and the CPVA is found to effectively reduce vibrations and environmental impact.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Acoustics
Venkateswararao Manchi, C. Sujatha
Summary: The study proposed a centrifugal double pendulum vibration absorber (CDPVA) to simplify the design for higher orders by deploying two pendulums in series; the mass and length values of the double pendulum are tuned to match the two natural frequencies, with torsional springs used at the pivot joints to counteract gravitational effects; through numerical simulation and actual testing, the designed CDPVA proved to be effective in reducing torsional vibration and vibration levels.
Article
Engineering, Mechanical
Hyung Joon Lee, Jae Kyung Shim
Summary: This research focuses on optimizing the torsional vibration and inertia of a hybrid electric vehicle powertrain, using a multibody dynamics model and a multi-objective genetic algorithm to determine the design parameter values of the DMF and CPVAs. The results show a significant reduction in vibrations transmitted to the electric motor through optimized design.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Acoustics
Ju-Hyok Kim, Jong-Hyok Ri, Hyok Jang, Chol-Ung Choe
Summary: This article introduces the centrifugal pendulum vibration absorber and the significant role of geometric nonlinear damping in reducing torsional vibrations in machines. The research findings suggest that geometric nonlinear damping can effectively eliminate multistability and hysteresis in steady states.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Energy & Fuels
Somendra Pratap Singh, Athar Hanif, Qadeer Ahmed, Maarten Meijer, John Lahti
Summary: This study aims to utilize the battery pack of a mild-hybrid heavy-duty truck to store sufficient energy for auxiliary loads during stops. A dynamic programming framework is developed to optimize the energy management strategy, minimizing fuel consumption and maximizing regeneration. The results show a 6.47% reduction in fuel consumption compared to traditional APU-based trucks.
Article
Engineering, Mechanical
V Mahe, A. Renault, A. Grolet, H. Mahe, O. Thomas
Summary: This paper discusses a new design of centrifugal pendulum vibration absorbers (CPVAs) to reduce vibrations in automotive transmission lines. These CPVAs use multiple masses oscillating in relation to the rotor to counteract the input torque, with features such as nonlinearity and saturation phenomena. The design also takes into consideration the rotating motion of the masses relative to the rotor, adding the advantage of rotational inertia.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Acoustics
Johannes Mayet, Mustafa A. Acar, Steven W. Shaw
Summary: This work presents a design methodology for robust and effective centrifugal pendulum absorbers, which can translate the relative center of mass along a given path and rotate angular body. The method reduces rotor fluctuations and is suitable for aircraft and automotive drive systems. The application of nonlinear tautochronic design philosophy and nonlinear detuning enables the design of more effective and robust absorbers.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Mechanics
Pu Gao, Hongcai Li, Hui Liu, Changle Xiang
Summary: This article presents a detailed design and manufacturing process of an innovative torsional vibration absorber with magnetorheological elastomers (MREs) as its core intelligent element. A series of experiments are carried out to evaluate the vibration reduction performance and feasibility of the new vibration absorber.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Multidisciplinary Sciences
Elif Gozen, M. Sedat cevirgen, Emre Ozguel
Summary: This paper examines the application of electrification in the heavy-duty truck industry, specifically the impact of electric axle transmission speed and ratio on the performance and energy consumption of electric trucks. Through a series of simulated experiments, it is found that using electric motors at the same speed and turning off one below specific torque values can decrease energy consumption, and increasing the number of gears in the single transmission improves the efficiency of the electric motors. Based on the research findings, a 3-speed single transmission is identified as the optimal choice, as it satisfies gradeability requirements with the lowest energy consumption and less system complexity.
Article
Engineering, Mechanical
Lina Wramner
Summary: This paper investigates steady-state torsional vibrations in a heavy-duty truck powertrain, focusing on engine-excited vibrations at high load. By studying conventional heavy-duty powertrains and powertrains equipped with dual mass flywheels, it is shown that the use of a dual mass flywheel can enable down-speeding and increased engine torque while maintaining or reducing levels of torsional vibrations.
INTERNATIONAL JOURNAL OF HEAVY VEHICLE SYSTEMS
(2021)
Article
Engineering, Mechanical
Mattia Cera, Marco Cirelli, Ettore Pennestri, Pier Paolo Valentini
Summary: The application of centrifugal pendulum vibration absorbers (CPVAs) in the automotive industry is increasing, leading to the development of new types of CPVAs, such as the torsichrone. This paper investigates the kinematics and nonlinear dynamics of trapezoidal dampers, offering insights into the impact of absorber center of mass path and proposing optimization criteria for the rotational component of absorbers motion. Design guidelines based on these analyses are recommended. Additionally, a numerical comparison with the tautochrone parallel pendulum and results of multibody dynamics simulation are discussed to assess vibration isolation effectiveness and local stability behavior of trapezoidal CPVAs.
NONLINEAR DYNAMICS
(2021)
Article
Acoustics
Bahadir Sarikaya, Murat Inalpolat
Summary: This paper presents an analytical investigation on the sensitivity of centrifugal pendulum vibration absorbers (CPVA) to symmetry-breaking absorber imperfections. It provides an improved absorber tuning strategy for robust vibration and noise reduction in realistic vehicle transmissions and drivelines. The study derives the free and forced vibration response sensitivity of generalized CPVA systems for absorber spacing and mass variations using a perturbation-based eigensensitivity technique. The linearized planar dynamic model used includes torsional and translational motions of the rotor along with oscillations of baseline identical absorbers. Results highlight the response alterations and localized response patterns due to asymmetric absorber spacing and mass variations, and propose a new parametric lower limit for the overtuning of absorbers.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Acoustics
Chen Long, Wenku Shi, Zhiyong Chen
Summary: The influence of nonlinear factors on the dynamic behavior of the powertrain torsional damper was studied using the average method. Analysis of the structure and working principle of the dual mass flywheel, establishing a nonlinear dynamic model, obtaining frequency response curve by the average method, and studying the effect of flywheel parameters on amplitude-frequency characteristics. The results show that the average method is suitable for nonlinear vibration analysis, and different parameters have varying effects on the amplitude-frequency characteristics.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Engineering, Mechanical
Mohammad Afzal, Ines Lopez Arteaga, Leif Kari
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2018)
Article
Chemistry, Physical
Leif Kari
Summary: The study demonstrates that vibration isolators made of doubly cross-linked hydrogels can significantly reduce energy flow peaks without the need for optimizing the frequency for maximum physical loss modulus. The chemical and physical cross-linking structure of these hydrogels allows for a high loss factor within a specific frequency range.
Article
Polymer Science
Bochao Wang, Leif Kari
Summary: A three-dimensional nonlinear constitutive model for isotropic magneto-sensitive (MS) rubber has been developed, integrating the amplitude, frequency, magnetic and temperature dependent mechanical properties, enabling accurate prediction of its mechanical behavior and advancing its engineering applications.
Article
Polymer Science
Michael Coja, Leif Kari
Summary: A waveguide model is developed for a pre-compressed cylindrical natural rubber vibration isolator, with dynamic stiffness strongly depending on frequency and pre-compression, leading to resonance phenomena and low-frequency stiffness increases with higher pre-compressions. Good agreement with nonlinear finite element results is observed.
Article
Engineering, Mechanical
Erik R. Gomez, Jakob Sjostrand, Leif Kari, Ines Lopez Arteaga
Summary: A study on the application of a nonlinear centrifugal pendulum vibration absorber with normal-force dependant friction loss in a downspeeded powertrain of a heavy-truck is conducted. The performance of the CPVA is affected by system dynamics, and downspeeding of the engine can reduce CO2 emissions but increase torsional vibration and noise, which can be mitigated by using CPVA.
MECHANISM AND MACHINE THEORY
(2022)
Article
Materials Science, Characterization & Testing
Bochao Wang, Yan Li, Yingduan Gao, Jingyi Zhang, Zhenbang Xu, Jun Li, Ji Li, Leif Kari, Yu Wang, Xinglong Gong
Summary: The mechanical properties of anisotropic MRE under different conditions were studied, revealing the presence of MR effect even when the magnetic particle chain is perpendicular to the magnetic field, with contribution from Maxwell stress tensor. Additionally, a significant strain amplitude dependent viscoelastic behavior was observed, along with a decrease in MR effect and loss factor with increased prestrain. These findings contribute to the design, modeling, and applications of anisotropic MRE.
Article
Materials Science, Characterization & Testing
Aitor Erenchun, Blas Blanco, Nere Gil-Negrete, Bochao Wang, Leif Kari
Summary: The effect of lubrication on the mechanical behavior of magnetorheological elastomers in compression mode was experimentally studied, and it was found that lubrication has a significant impact on material properties.
Article
Education & Educational Research
Anna-Karin Hogfeldt, Lena Gumaelius, Per Berglund, Leif Kari, Arnold Pears, Viggo Kann
Summary: This article focuses on the experiences of implementing sustainable development in all educational programs at a technical university over a period of ten years, and specifically addresses the issue of involving more academics in this work. Through an ethnographic account and focus group interviews, the challenges and demands of incorporating sustainable development in the curriculum are explored, and the evolution of a network of interconnected people, key academics, activities, norms and tools is identified as contributing to increased participation.
EUROPEAN JOURNAL OF ENGINEERING EDUCATION
(2023)
Article
Acoustics
Erik R. Gomez, Leif Kari, Ines Lopez Arteaga
Summary: A flywheel-mounted centrifugal pendulum absorber is designed to suppress the low-frequency shuffle-mode resonance of a heavy-duty truck powertrain. Linear analysis and nonlinear simulations are used to validate the design, and the CPVA is found to effectively reduce vibrations and environmental impact.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Materials Science, Characterization & Testing
M. Vizcaino-Vergara, L. B. Tunnicliffe, J. J. C. Busfield, L. Kari
Summary: The guidelines provide a comprehensive method for using a torsion pendulum to characterize the viscoelastic properties of carbon black reinforced rubber. The method involves pre-testing to assess the influence of test set up and sample geometry, and post-processing steps to evaluate the quality of the curve data. The method aims to improve accuracy and reliability of results obtained from the torsion pendulum.
Article
Polymer Science
Maria Vizcaino-Vergara, Leif Kari, Lewis B. Tunnicliffe, James J. C. Busfield
Summary: Filler reinforced rubber is widely used in engineering applications. A study on the effects of physical aging is crucial in accurately predicting its viscoelastic properties. The torsion pendulum is used to monitor the evolution of the storage and loss modulus of carbon black filled samples for four days. The results show the presence of physical aging and provide important data on the influence of physical aging on the viscoelastic properties of the material.
Article
Chemistry, Physical
Leif Kari
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)
