Showing papers on "Active vibration control published in 2022"
TL;DR: In this paper , a feedback control law is proposed to control the actuator's input current, to significantly attenuate the broadband vibration transmissibility from the base excitation to the bistable actuator mover.
26 citations
TL;DR: Simulations and experiments demonstrate that a model-free linear quadratic regulator designed by the proposed approach provides sufficient vibration reduction.
14 citations
TL;DR: In this article , the effect of porosity volume fraction ( ψ ) and volume fraction index (λ ) on active vibration attenuation is investigated and compared with the dense FGPM sensor and actuator layer.
10 citations
TL;DR: In this paper, the effect of porosity volume fraction ( ψ) and volume fraction index (λ ) on active vibration attenuation is investigated and compared with the dense FGPM sensor and actuator layer.
10 citations
TL;DR: In this paper , the active vibration control of piezoelectric sandwich plate is investigated. And the results show that within a certain range, the larger the value of the speed feedback coefficient, the better the active control effect.
Abstract: This paper deals with the active vibration control of piezoelectric sandwich plate. The structure consists of a substrate plate layer sandwiched between two layers of piezoelectric sensor and actuator. Based on laminate theory and constitutive equation of piezoelectric material, the vibration active control dynamic equation of the sandwich structure is established by using hypothetical mode method and Hamilton principle. The Rayleigh-Ritz method is used to solve it. The form of hypothetical solution is used for approximate solution, which is simple and accurate. The method of this paper is verified by several examples. The parametric studies of the sandwich plate structures are carried out. The results show that applying different boundary conditions and piezoelectric patch positions to the structures have a great influence on the natural frequency. When the driving voltage increases, the deflection of the plate structures increase approximately linearly. The active vibration control studies are investigated as well. The results show that within a certain range, the larger the value of the speed feedback coefficient, the better the active control effect. The positions of the piezoelectric patches affect the effectiveness and cost of active control. When the piezoelectric plate is located at the fixed end, the effect and cost of active control are better than that at the midpoint and free end of the plate.
9 citations
TL;DR: In this article , a composite sandwich beam with adaptive active control system is proposed for low-frequency vibration reduction, and the experimental investigation on adaptive closed-loop vibration control is carried out.
8 citations
TL;DR: In this paper , a smart active vibration control (AVC) system containing piezoelectric actuators, jointly with a linear quadratic regulator (LQR) controller, is proposed to control transverse deflections of a wind turbine (WT) blade.
Abstract: A smart active vibration control (AVC) system containing piezoelectric (PZT) actuators, jointly with a linear quadratic regulator (LQR) controller, is proposed in this article to control transverse deflections of a wind turbine (WT) blade. In order to apply controlling rules to the WT blade, a state-of-the-art semi-analytical solution is developed to obtain WT blade lateral displacement under external loadings. The proposed method maps the WT blade to a Euler–Bernoulli beam under the same conditions to find the blade’s vibration and dynamic responses by solving analytical vibration solutions of the Euler–Bernoulli beam. The governing equations of the beam with PZT patches are derived by integrating the PZT transducer vibration equations into the vibration equations of the Euler–Bernoulli beam structure. A finite element model of the WT blade with PZT patches is developed. Next, a unique transfer function matrix is derived by exciting the structures and achieving responses. The beam structure is projected to the blade using the transfer function matrix. The results obtained from the mapping method are compared with the counter of the blade’s finite element model. A satisfying agreement is observed between the results. The results showed that the method’s accuracy decreased as the sensors’ distance from the base of the wind turbine increased. In the designing process of the LQR controller, various weighting factors are used to tune control actions of the AVC system. LQR optimal control gain is obtained by using the state-feedback control law. The PZT actuators are located at the same distance from each other an this effort to prevent neutralizing their actuating effects. The LQR shows significant performance by diminishing the weights on the control input in the cost function. The obtained results indicate that the proposed smart control system efficiently suppresses the vibration peaks along the WT blade and the maximum flap-wise displacement belonging to the tip of the structure is successfully controlled.
8 citations
TL;DR: In this article , an adaptive disturbance observer (ADO) and flexible vibration observer (FVO) are proposed to estimate the lumped uncertainty and flexible vibrations, and based on the proposed observers, a novel controller is designed to suppress flexible vibration and realize attitude control.
Abstract: In this article, active vibration suppression and attitude control for flexible spacecraft under model uncertainty and external disturbance are investigated. First, an adaptive disturbance observer (ADO) and flexible vibration observer (FVO) are proposed to estimate the lumped uncertainty and flexible vibration. It is shown that the proposed ADO is nonoverestimated and the first derivative upper bound of disturbance is unknown. Then, based on the proposed observers, a novel controller is designed to suppress flexible vibration and realize attitude control. The remarkable feature of the designed algorithm is that flexible vibration is suppressed and attitude tracking is guaranteed simultaneously without intelligent materials which are used to suppress flexible vibration in the previous work. In addition, high-precision attitude control can be achieved. The rigorous proof of closed-loop system stability is presented using Lyapunov techniques. Finally, numerical simulations are given to illustrate the efficiency of the proposed algorithm.
8 citations
TL;DR: In this paper , an active vibration control algorithm based on reinforcement learning (RL) is applied to suppress the coupling vibration of a multi-flexible beam coupling system, and the experimental setup of four-fold beam coupling is constructed.
7 citations
TL;DR: In this paper, a hybrid vibro-acoustic adaptive noise equalizer (HVA-ANE) algorithm was proposed to control the sound quality of vehicle interior sound, using the vibration sound transfer function and considering the requirements of sound quality.
7 citations
TL;DR: In this paper , an electromagnetic torsion active vibration absorber is proposed for low-frequency torsional vibration, and an active control system based on the filter-x least mean square (FxLMS) algorithm is established.
TL;DR: In this article , a quasi-active negative stiffness damper (QANSD) is proposed for effective and robust seismic protection by integrating the negative stiffness element and controllable damping element together, which enables to closely achieve active control performance with much less energy to operate compared to an active control system.
TL;DR: In this article , an offset piezoelectric stack actuator (OPSA) is used to damp the elastic vibrations of large flexible space structures, and a parametric analysis is carried out to optimize the maximum control action exerted by OPSA.
TL;DR: In this article , the authors investigated the potential performance benefits that can be achieved by implementing active control into an array of acoustic black holes (AABHs) embedded in a plate.
Abstract: Abstract Acoustic black holes (ABHs) are structural features that can be embedded into plates to provide effective structural damping. However, the performance of an embedded ABH is limited by its size, which determines the ABH cut-on frequency. It is not always practicable to increase the size of an ABH to reduce its cut-on frequency, however, previous work has shown that active vibration control can instead be used to enhance the low frequency performance of an ABH beam termination. This paper presents an investigation into the potential performance benefits that can be achieved by implementing active control into an array of ABHs embedded in a plate, realising an array of active ABHs (AABHs). The potential performance advantage is investigated here through experimental investigations, where different configurations of passive and active control treatments are applied to both a plate with embedded ABHs and a constant thickness plate. The smart structures utilise piezoelectric patches to realise the control actuation and employ an active feedforward multichannel vibration control strategy that aims to minimise the structural response monitored by an array of accelerometers. The performance of each plate configuration is evaluated in terms of the attenuation in the structural response and the energy, or control effort required. The presented experimental results demonstrate that, compared to the constant thickness plate configuration, the AABHs provide considerable passive damping above the ABH cut-on frequency and significantly reduce the required control effort.
TL;DR: A detailed literature review of the recent advances in hybrid vibration control systems was presented in this article , which focused on seismic and wind response mitigation of structures using hybrid vibration-control devices.
Abstract: A detailed literature review of the recent advances in hybrid vibration-control systems was presented in this article. In the literature, a combination of two or more vibration-control mechanisms, such as passive, active, and semiactive schemes, are defined as a hybrid vibration-control system. This review focused on seismic and wind response mitigation of structures using hybrid vibration-control devices. It started with the historical background of vibration-control systems and categorized hybrid control schemes within a proper frame of references. A detailed literature review on theoretical studies, experimental investigations, and real-life applications of hybrid vibration-control systems was presented. Specifically, this review presented the development in hybrid vibration-control schemes such as passive-passive, semiactive-passive, and active-passive systems. Active-passive damping devices combine the reliability, robustness, and low cost of viscoelastic damping with high-performance, model-selective, and adaptive piezoelectric active control. The semiactive-passive system is a combined system of semiactive damping devices and passive dampers. The passive-passive system consists of two or more passive damping devices. The review shed light on the pros and cons of each of hybrid vibration-control systems and provided the scope of future research for more robust vibration control, which involves dealing with limitations such as weight, size, cost, maintenance, and design obstacles of hybrid vibration-control systems.
TL;DR: In this article , a self-powered active vibration control system was designed and applied to a scaled active vibration isolation table, and the feasibility and effectiveness of the innovative system were successfully validated through a series of analytical, numerical, and experimental investigations.
TL;DR: In this article , a semi-active electromechanical Tuned Mass Damper (SATMD) is proposed to provide robust multi-modal vibration suppression capabilities in large flexible structures.
TL;DR: In this article , the effect of the control signal phase on the piezoelectric constrained layer of ACLD cantilever beam has been investigated and a dynamic model of the ACLD beam was created, which can effectively simulate two damping mechanisms.
TL;DR: Considering the problems of model uncertainties, higher harmonics, uncertain boundary conditions, external excitations, and system time delay in practical vibration control system, a novel active vibration control method is proposed to suppress the vibration of a thin plate structure with acceleration sensor and piezoelectric bimorph actuator in this article .
Abstract: Considering the problems of model uncertainties, higher harmonics, uncertain boundary conditions, external excitations, and system time delay in practical vibration control system, a novel active vibration control method is proposed to suppress the vibration of a thin plate structure with acceleration sensor and piezoelectric bimorph actuator in this paper. First, a nonlinear extended state observer (NESO)-based controller is designed to ensure the anti-disturbance performance of the structural vibration control system. Then, an enhanced differentiator-based time delay compensation method is introduced to improve the vibration suppression performance of the NESO-based controller. A real time hardware-in-the-loop benchmark for an all-clamped piezoelectric thin plate is designed to verify and compare the performance of the developed controller against conventional ESO-based methods (linear ESO with/without time delay compensation, NESO without time compensation). The best vibration suppression and disturbance rejection performance of the proposed NESO-based controller with an enhanced time delay compensator is verified in the comparative experimental results. This work is able to provide practitioners with vital guidance in designing active vibration control system in the presence of disturbances and time delay.
TL;DR: In this paper , a new control structure for ball screw drives (BSDs) is presented, which achieves position tracking through an outer loop, and active vibration damping for dynamic stiffness enhancement through an inner loop based on H2-synthesis.
TL;DR: In this paper , the authors developed a complete analytical model for a cantilever beam with a collocated PZT sensor/actuator pair and performed a complete optimization for sensor position and PID parameters, using genetic algorithms.
Abstract: Vibration is one of the most dangerous phenomena that happens to a structure. It leads to premature fatigue and eventually failure, with potentially fatal consequences. A smart structure is an excellent solution to this problem; it adds an actuator, a sensor, and an appropriate control law to the system to reduce/eliminate the vibration. This study developed a complete analytical model for a cantilever beam with a collocated PZT sensor/actuator pair. First, we used a coupling of a collocated PZT sensor and an actuator to measure and control vibration levels based on a PID control law considering the physical constraints associated with PZT operation as the voltage level of the actuator. Next, the damping coefficient of the structure was determined by using genetic algorithms best fit to satisfy specific vibration conditions. Finally, we conducted a complete optimization for sensor/actuator position and PID parameters, using genetic algorithms. Thus, this paper gives a thorough understanding of the potential vibration control of the cantilever beam.
TL;DR: In this article , an approach to extend the capabilities of forced vibration suppression of the dynamic vibration absorbers into desired motion trajectory tracking control algorithms for a four-rotor unmanned aerial vehicle (UAV) is introduced.
Abstract: Conventional dynamic vibration absorbers are physical control devices designed to be coupled to flexible mechanical structures to be protected against undesirable forced vibrations. In this article, an approach to extend the capabilities of forced vibration suppression of the dynamic vibration absorbers into desired motion trajectory tracking control algorithms for a four-rotor unmanned aerial vehicle (UAV) is introduced. Nevertheless, additional physical control devices for mechanical vibration absorption are unnecessary in the proposed motion profile reference tracking control design perspective. A new dynamic control design approach for efficient tracking of desired motion profiles as well as for simultaneous active harmonic vibration absorption for a quadrotor helicopter is then proposed. In contrast to other control design methods, the presented motion tracking control scheme is based on the synthesis of multiple virtual (nonphysical) dynamic vibration absorbers. The mathematical structure of these physical mechanical devices, known as dynamic vibration absorbers, is properly exploited and extended for control synthesis for underactuated multiple-input multiple-output four-rotor nonlinear aerial dynamic systems. In this fashion, additional capabilities of active suppression of vibrating forces and torques can be achieved in specified motion directions on four-rotor helicopters. Moreover, since the dynamic vibration absorbers are designed to be virtual, these can be directly tuned for diverse operating conditions. In the present study, it is thus demonstrated that the mathematical structure of physical mechanical vibration absorbers can be extended for the design of active vibration control schemes for desired motion trajectory tracking tasks on four-rotor aerial vehicles subjected to adverse harmonic disturbances. The effectiveness of the presented novel design perspective of virtual dynamic vibration absorption schemes is proved by analytical and numerical results. Several operating case studies to stress the advantages to extend the undesirable vibration attenuation capabilities of the dynamic vibration absorbers into trajectory tracking control algorithms for nonlinear four-rotor helicopter systems are presented.
TL;DR: Based on field measurements on a 600m-tall skyscraper equipped with an active tuned mass damper (ATMD) system, the authors investigates the control performance of the world's largest ATMD system to suppress the building vibrations.
Abstract: Based on the field measurements on a 600-m-tall skyscraper equiped with an active tuned mass damper (ATMD) system, this paper investigates the control performance of the world's largest ATMD system to suppress the building vibrations. On-site forced vibration tests on the skyscraper were first conducted and the results showed that the ATMD system can increase the damping ratios of the fundamental sway modes up to about 11 times. Accordingly, ambient vibration tests on the building during Super Typhoon Hato were carried out, and the measured building acceleration responses showed that the ATMD system can effectively suppress the wind-induced vibrations of the skyscraper. Moreover, the structural damping ratios of the building with and without the operation of the ATMD system were identified, which showed that the ATMD system can significantly boost the damping ratios of the fundamental sway modes of the building for suppressing wind-induced vibrations, while it had limited effects on higher modal responses. The paper aims to provide useful information for the design of active vibration control systems and the wind-resistant design of high-rise buildings.
TL;DR: In this article, the authors use the relative displacements of the rotor for control, which are proportional to the deformation of the rotational axis, to eliminate the force-free resonances.
TL;DR: In this article , the authors proposed a 2-DOF vibration model for a beam-type dynamic vibration absorber with piezoelectric elements and an LR circuit, and the optimum values of the proposed 2-D vibration model were obtained using this equivalent transformation and the exact optimum values for a conventional series-type double-mass dynamic vibration model.
01 Jan 2022
TL;DR: The pressure of exhaust emission regulations on automotive manufacturers to reduce environmental pollution and fuel consumption of internal combustion engines (ICEs) have stimulated the works on the development of new ICEs.
Abstract: The pressure of exhaust emission regulations on automotive manufacturers to reduce environmental pollution and fuel consumption of internal combustion engines (ICEs) have stimulated the works on th...
TL;DR: In this article , a feedback control strategy is applied to an ABH terminated beam, with a piezoelectric patch providing the control actuation, and the feedback strategy is a remote vibration control methodology and is used to examine the different compensators that are potentially available to control simultaneously both the local taper vibration and the reflected wave component.
TL;DR: In this paper, a modified optimization criterion was proposed for piezoelectric actuator placement in connection with active vibration control, considering the torsion of the actuator.
Abstract: The optimization of piezoelectric actuator placement has been widely investigated in connection with active vibration control. In this paper, a modified optimization criterion considering t...
TL;DR: In this article , a variable-step-size multichannel FxLMS algorithm based on the sampling function was proposed, which accelerates the convergence speed in the initial stage of iteration, improves the convergence accuracy in the steady-state adaptive stage, and makes the modified algorithm more robust.
Abstract: Gears are the most important parts of rotating machinery and power transmission devices. When gears are engaged in meshing transmission, vibration will occur due to factors such as gear machining errors, meshing rigidity, and meshing impact. The traditional FxLMS algorithm, as a common active vibration algorithm, has been widely studied and applied in gear transmission system active vibration control in recent years. However, it is difficult to achieve good performance in convergence speed and convergence precision at the same time. This paper proposes a variable-step-size multichannel FxLMS algorithm based on the sampling function, which accelerates the convergence speed in the initial stage of iteration, improves the convergence accuracy in the steady-state adaptive stage, and makes the modified algorithm more robust. Simulations verify the effectiveness of the algorithm. An experimental platform for active vibration control of the secondary gear transmission system is built. A piezoelectric actuator is installed on an additional gear shaft to form an active structure and equipped with a signal acquisition system and a control system; the proposed variable-step-size multichannel FxLMS algorithm is experimentally verified. The experimental results show that the proposed multichannel variable-step-size FxLMS algorithm has more accurate convergence accuracy than the traditional FxLMS algorithm, and the convergence accuracy can be increased up to 123%.