Article
Mechanics
Zhikun Sun, Zhiwei Shi, Zheng Li, Xi Geng, Zhenquan Yin
Summary: This paper investigates the effects of electrode configuration on the heat transfer characteristics of pulsed surface arc discharge (PSAD) and the disturbance characteristics of PSAD on the flow field. The results show that the curvature of curve (COC) of the electrode has an optimal solution and affects the concentration of PSAD disturbances to the flow field. The electrode configuration can cause an end point effect, resulting in a deviation between the theoretical COC and the real COC. The COC affects the disturbance degree by distorting the electric field intensity distribution.
Article
Engineering, Aerospace
Oleg Vishnyakov, Pavel Polivanov, Andrey Sidorenko
Summary: The paper investigates unsteady effects in shock wave/boundary layer interactions by using a flat plate model subjected to certain flow conditions. The results showed that disturbances in the frequency range of 500 to 1700 Hz mostly decay, with maximum amplitudes observed at frequencies of 1250 Hz and 1700 Hz.
Article
Engineering, Aerospace
David Greenblatt, Omer Pfeffermann, David Keisar, Berkant Goeksel
Summary: The use of Dielectric Barrier Discharge (DBD) plasma actuators on Wells turbine impeller blades shows remarkable performance improvements by controlling leading-edge separation. Pulsating perturbations lead to acceleration or deceleration of the impeller, resulting in increased turbine power output compared to plasma power input. The implementation of DBD plasma actuators has the potential to be a game-changing technology, with technical challenges being overcome for successful application.
Article
Thermodynamics
S. Khasare, F. Bagherighajari, F. Dolati, J. Mahmoudimehr, J. C. Pascoa, M. Abdollahzadeh
Summary: This study numerically investigates the effect of employing a surface-mounted annular plasma actuator on a bluff body in a non-premixed burner. The results show that activating the plasma actuator leads to improvements in flame structure and mixing, reducing the concentration of CO. The favorable position for the plasma actuator is on the bluff body surface near the air duct.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
J. Serpieri, M. T. Hehner, J. Kriegseis
Summary: This document describes a novel concept for actively isolating neighboring electrodes of multi-electrodes plasma actuators. The proposed concept splits the voltage signals supplied to the operated electrodes into a baseline signal and a time-modulated component, reducing the voltage difference between operated and not-operated neighboring electrodes and preventing detrimental interactions.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Physics, Applied
Sibo Huang, Enmin Zhou, Zhilong Huang, Pengfei Lei, Zhiling Zhou, Yong Li
Summary: A novel acoustic metaliner is proposed to effectively attenuate sound energy in a wide frequency range under grazing flow, providing a route to reduce flow-related noise. By tuning the coupling between NEHRs and the perforated plate, efficient broadband impedance modulation is achieved, leading to strong dissipation of sound energy at different flow speeds.
APPLIED PHYSICS LETTERS
(2021)
Article
Mechanics
Chenguang Lai, Liangkui Tan, Shigeru Obayashi
Summary: This study investigates the aeroacoustic control mechanism of a plasma jet on a high-speed moving wing under a wing-in-ground effect. The results show that different plasma excitation modes interfere with the vortex generation and development in different ways to achieve aeroacoustic reduction. The modal analysis reveals that the change in each order of the modal corresponds to the energy decrease at the peak frequency and the energy increase at high frequencies.
Article
Engineering, Aerospace
Xin Gu, Huu Duc Vo, Njuki W. W. Mureithi, Eric Laurendeau
Summary: This study evaluates a flight control concept using electrofluidic actuators without movable surfaces, starting from low-speed 2-D rectangular wings and progressing to 3-D full-scale tapered swept wings under realistic aircraft operating conditions. The results show that the plasma Gurney flap performs better on tapered and swept wings, and the presence of shocks at cruise flight conditions improves the effectiveness of this concept.
JOURNAL OF AIRCRAFT
(2023)
Article
Engineering, Aerospace
Bo Li, Xuanshi Meng, Shiqing Yin, Weiwei Hui, Huaxing Li
Summary: A NACA0025 coflow jet airfoil model was designed and manufactured using 3D printing technology, and its flow characteristics and control mechanism were studied. Experimental results showed that the PCFJ airfoil had better performance in delaying flow separation in wind tunnel tests.
Article
Mechanics
Liming Feng, Xiaogang Ma, Yuntian Zhang, Chen Wang, Rui Xue, Zhi Chen
Summary: This study experimentally and numerically investigated the disturbance effects of arc plasma energy deposition on shock wave/turbulent boundary layer interaction (STBLI). The experiments captured the flow structures and evolution process of impinging STBLI disturbed by the energy deposition. It was found that the thermal bubbles induced by the energy deposition had a significant impact on both the incident shock wave and the separation shock wave. The ability of the energy deposition to disturb the impinging STBLI decreased as the flow deflection angle increased. The numerical simulations showed that the energy deposition hindered the velocity development of the turbulent boundary layer, and the instability of the separation shock waves was induced by both thermal bubbles and blast waves.
Article
Chemistry, Multidisciplinary
Sina Martin, Arne Bruns, Joerg Franke
Summary: The authors developed a prototype of a flexible dynamic iris implant using automated manufacturing technique. The implant can mimic the human iris reflex and control the light flux, showing potential for self-regulation.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Polymer Science
Joao Nunes-Pereira, Frederico Freire Rodrigues, Mohammadmahdi Abdollahzadehsangroudi, Jose Carlos Pascoa, Senentxu Lanceros-Mendez
Summary: Dielectric barrier discharge (DBD) plasma actuators utilize thin dielectric layers to separate high-voltage electrodes and prevent arcs, with this report comparing the performance of Kapton and Cirlex as dielectric layers. The study found that Cirlex consumes less power, generates higher induced flow velocity, and achieves higher mechanical power and electromechanical efficiency compared to Kapton. The results indicate that Cirlex is a suitable alternative to Kapton for fabricating DBD plasma actuators for flow control with improved performance.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Engineering, Mechanical
Hyeonbin Ryoo, Wonju Jeon
Summary: A thin acoustic metasurface is proposed for broadband absorption of low-frequency sound using hybrid resonances at multiple target frequencies, achieving lower Q-factors compared to existing absorbing structures. The design procedures allow for perfect sound absorption at multiple target frequencies, opening possibilities for practical applications in noise mitigation of various mechanical systems.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Acoustics
Wan Chen, Chihua Lu, Zhien Liu, Xiaolong Li, Jian Shen
Summary: The HASQC algorithm proposed in this paper combines multiple subsystems to effectively control the sound quality of target noise with both narrowband and broadband characteristics, meeting human perception requirements, and demonstrating good control performance in different scenarios.
Article
Engineering, Mechanical
Pedro P. C. Brito, Pierluigi Morra, Andre V. G. Cavalieri, Tiago B. Araujo, Dan S. Henningson, Ardeshir Hanifi
Summary: This study successfully applied the inverse feed-forward control technique to control TS waves over a wing profile in a wind tunnel, achieving a significant reduction in TS wave amplitude using a single plasma actuator and measurements with microphones.
EXPERIMENTS IN FLUIDS
(2021)
Article
Mechanics
Yong Li, Xiao Ming
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2016)
Article
Engineering, Aerospace
Yong Li, Malcolm Smith, Xin Zhang
AEROSPACE SCIENCE AND TECHNOLOGY
(2012)
Article
Engineering, Aerospace
Li Yong, Wang Xunnian, Zhang Dejiu
CHINESE JOURNAL OF AERONAUTICS
(2013)
Article
Engineering, Aerospace
Yong Li, Malcolm G. Smith, Xin Zhang
JOURNAL OF AIRCRAFT
(2010)
Article
Engineering, Mechanical
Yong Li, Xun-nian Wang, Zheng-wu Chen, Zheng-chu Li
JOURNAL OF FLUIDS AND STRUCTURES
(2014)
Article
Engineering, Aerospace
Yong Li, Zhengwu Chen
Summary: The study investigates the attenuation of spatially evolving instability Tollmien-Schlichting (T-S) waves in the boundary layer of a flat plate with zero pressure gradients using an active feedback control scheme. Results show that feedback control can effectively reduce three-dimensional disturbances in the boundary layer, demonstrating practical potential.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Mechanics
Yong Li, Zhengwu Chen, Xunnian Wang
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2020)
Article
Mechanics
Xiao-Fei Niu, Yong Li, Xun-Nian Wang
Summary: The study investigates the noise characteristics and generation mechanism of a cooling fan, showing that the perforation rate of the strut and the streamwise gap between the airfoil and strut affect the aerodynamic and noise behaviors. The analysis reveals that in the vertical direction, both the unsteady lift forces on the airfoil and strut contribute equally to the far-field noise, while in the upstream/downstream direction, the noise is mainly produced by the unsteady drag on the strut.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2021)
Article
Engineering, Aerospace
Yong Li, Xiaofei Niu
Summary: This paper investigates the vortex-body interaction noise and the effects of different parameters on the characteristics of this noise. It finds that changing the cross section to elliptical and the install angles of the airfoil can significantly reduce the noise.
Article
Engineering, Aerospace
Yaowen Zhang, Yong Li
Summary: This paper experimentally investigates the flow interaction and associated noise between an upstream cylinder and a downstream finite-chord-length flat plate with a blunt trailing edge. The results show that the trailing-edge noise caused by vortex shedding from the flat plate is significantly reduced when the vertical gap between the cylinder and the flat plate surface is small. As the vertical gap increases, the dominance of the leading-edge interaction noise due to the cylinder wake impingement decreases. The change in noise frequency is confirmed by measuring the pressure fluctuations along the plate surface and analyzing the flow characteristics using surface microphones and particle image velocimetry (PIV) techniques.
Article
Acoustics
Xiaofei Niu, Hongjun Chen, Yong Li, Xiangyang Jia, Yaowen Zhang, Xin Yong, Cheng Li
Summary: This paper presents a newly built small-scale acoustic wind tunnel at Wenzhou University for studying the generation and suppression of aerodynamic noise for various objects in fluid flow. The wind tunnel has a satisfactory design, low background noise levels, and is suitable for aerodynamic noise studies.
Article
Engineering, Industrial
Chengjie Zhang, Faqun Qi, Ning Zhang, Yong Li, Hongzhong Huang
Summary: A novel maintenance policy is proposed for a multi-component system, taking into account the multiple dependencies between components and their dynamic importance. The system's long-run average cost is derived by analyzing the reliability of the auxiliary and critical components and determining the optimal inspection period and maintenance threshold.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Thermodynamics
W. Fu, Y. Li
Summary: An experimental study was conducted on a side-view mirror model to investigate the effect of a slot on reducing aerodynamic noise and drag. The results showed that increasing the airflow rate through the slot resulted in a reduction in side wall pressure fluctuations and drag coefficient.
JOURNAL OF APPLIED FLUID MECHANICS
(2023)
Article
Physics, Applied
Xinfu Luo, Yong Li
Summary: In this paper, a sliding discharge plasma actuator designed for controlling circular cylinder wakes is experimentally examined. The plasma actuator can induce either a downward or upward jet into the flow around the cylinder by adjusting the electrodes' electrical circuits. The study shows that it is possible to reduce or increase the cylinder drag force by changing the plasma actuation directions, with up to 30% drag reduction and 24% drag increase achieved.
MODERN PHYSICS LETTERS B
(2022)
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)