Showing papers on "Active vibration control published in 2017"
TL;DR: The proposed actuator only used the first-order longitudinal vibration to generate linear motion, which made the design, optimization, and miniaturization of the actuator more flexible by abbreviating the frequency degeneration.
Abstract: A frog-shaped linear piezoelectric actuator was proposed, designed, fabricated, and tested. The proposed actuator only used the first-order longitudinal vibration to generate linear motion, which made the design, optimization, and miniaturization of the actuator more flexible by abbreviating the frequency degeneration. By stimulating the first-order longitudinal vibration, alternate oblique movements are formed on the ends of two driving feet. Meanwhile, an elongating and shortening movement of the whole actuator is generated. When two parallel walls are in contact with the ends of two diving feet and a vertical preload is applied, the vertical components of the alternate oblique movements will overcome the preload, while the horizontal components of the alternate oblique movements and the elongating and shortening movements will together push the actuator into linear motion. Vibration characteristics and alternate oblique movements of the driving feet were investigated by the finite-element method. Experiment tests of vibration characteristics and mechanical output ability were then carried out. The tested resonance frequency and vibration amplitudes agreed well with the calculated ones. The prototype achieved a maximum speed and a thrust of 287 mm/s and 11.8 N, respectively.
70 citations
TL;DR: In this article, a negative proportional feedback control strategy is employed to design the controllers which can provide a positive active stiffness to the beam for a positive feedback control gain, which can increase the stability of the structural system.
66 citations
TL;DR: In this article, the authors investigated an active vibration control strategy for a barge-type floating wind turbine by setting a stroke-limited hybrid mass damper (HMD) in the turbine's nacelle.
59 citations
TL;DR: A non-probabilistic time-dependent reliability method that combines the active vibration control theory with interval analysis is proposed in this article to effectively estimate the dynamic safety of the controlled structures, in which circumstances the unknown-but-bounded uncertainties in structural parameters are considered.
Abstract: Summary
The active control system for structural vibration is extremely sensitive to the parametric uncertainty so that more and more concerns of its reliability estimation have been given recently. In view of the insufficiency of the uncertainty information in practical engineering, a non-probabilistic time-dependent reliability method that combines the active vibration control theory with interval analysis is proposed in this paper to effectively estimate the dynamic safety of the controlled structures, in which circumstances the unknown-but-bounded uncertainties in structural parameters are considered. The uncertain structural responses based on the closed-loop control are firstly analyzed and embodied by the interval process model. By virtue of the first-passage theory, an integral procedure of non-probabilistic time-dependent reliability analysis of the active control system for structural vibration is then conducted. Two engineering examples and one experimental application are eventually presented to demonstrate the validity and applicability of the methodology developed.
58 citations
TL;DR: In this paper, an active mass damping (AMD) consisting of an AC servo motor, a movable mass connected to the servo motors by a ball-screw mechanism, and an accelerometer as a sensor for vibration measurement was considered.
56 citations
TL;DR: In this paper, a novel element-free IMLS-Ritz model based on Reddy's higher-order shear deformation theory is proposed for active vibration control of carbon nanotube reinforced composite (CNTRC) plates with piezoelectric layers.
52 citations
TL;DR: In this paper, an automated identification of machine dynamics and auto-tuning of the controller using the same actuator and vibration sensor is presented, which has been experimentally demonstrated with simple and advanced controllers which led to notable increases in chatter free material removal rates.
45 citations
43 citations
TL;DR: In this paper, both experimental and numerical applications for the determination of the dynamic behavior of a tank gun system are investigated. And the use of muzzle reference system (MRS) and vibration absorbers, and active vibration control technology for the control and reduction of the muzzle tip deflections are also reviewed.
43 citations
TL;DR: A cell-based smoothed discrete shear gap method (CS-DSG3) based on the first-order shear deformation theory was recently proposed for static and dynamics analyses of Mindlin plates as discussed by the authors.
41 citations
TL;DR: In this paper, the authors investigated the flexural vibration control effects produced on a distributed two-dimensional thin structure by an electrically shunted piezoelectric patch tuned vibration absorber.
TL;DR: In this paper, an active damper based on magnetorheological elastomers is used as an actuator of micro- or nanopositioning for a vibroinsulated object.
TL;DR: In this article, a self-sensing electromagnetic transducer is used to suppress the second-order and third-order vibrations of a space antenna reflector by 4 and 9 dB, respectively.
Abstract: Space antenna reflectors are used by space vehicles to communicate with ground stations. These reflectors are generally subject to broadband random vibration and shock conditions during shipment and vehicle launch. While active vibration control methods can reduce any unexpected responses, sensors, controllers, power amplifiers, and actuators are all required to implement the control system. These additional external devices increase both the weight and the cost of the reflector, and reduce the reliability and safety of the space product. This study proposes a novel self-sensing vibration control method and applies a self-sensing electromagnetic transducer to suppress the vibration of a space antenna reflector. This transducer is used bifunctionally, acting as both an isolator and a velocity sensor. The vibration control principle of the proposed method is analyzed. A governing equation is established using the finite element method. A type of degree of freedom reduction method is used to obtain the response of the space antenna reflector. A ground experiment is then set up. The results demonstrate that the proposed self-sensing vibration control method can reduce the second-order and third-order vibrations of the space antenna reflector by 4 and 9 dB, respectively.
TL;DR: In this article, a coupled finite element model of the structure is derived assuming a two-phase material and this structural model is written into the state-space representation, and the optimization of the shape and placement of the conventionally embedded piezoelectric actuators are performed using a sequential linear programming (SLP) algorithm.
TL;DR: In this article, a decentralized active controller is investigated for the isolator of dynamic isotropy, where the controller decouples the six-axis vibration control into six identical control of a single axis vibration isolator.
TL;DR: In this article, a method of multi-mode vibration control for the carbody of high-speed electric multiple unit (EMU) trains by using the onboard and suspended equipments as dynamic vibration absorbers (DVAs) is proposed.
TL;DR: In this article, an active control technique utilizing piezoelectric actuators to alleviate gust response loads of a large-aspect-ratio flexible wing is investigated, and numerical gust responses are analyzed, based on which a gust load alleviation (GLA) control system is proposed.
TL;DR: In this article, the authors developed a model-based approach to the investigation on the active vibration control of a clamped-clamped plate with partial SCLD treatment, where a modal controller in conjunction with modal state estimator is designed to solve the problem of full state feedback, making it much more feasible to realtime control.
TL;DR: To realize a vibration suppression of flexible structures like a membrane, Wang et al. as mentioned in this paper focused on introducing smart structures technology into the membrane structure, which can be used to improve the performance of the membrane.
Abstract: To realize a vibration suppression of flexible structures like a membrane, our research focuses on introducing smart structures technology into the membrane structure. In this study, the membrane s...
TL;DR: In this paper, a semi-active dynamic vibration absorber (SDVA) was designed based on the magnetic-induced variable stiffness characteristic of the MRE's magnetic properties, which can be used as variable-stiffness components in the design of a SDVA.
Abstract: The control of the longitudinal pulsating force and the vibration generated is very important to improve the stealth performance of a submarine. Magnetorheological elastomer (MRE) is a kind of intelligent composite material, whose mechanical properties can be continuously, rapidly and reversibly controlled by an external magnetic field. It can be used as variable-stiffness components in the design of a semi-active dynamic vibration absorber (SDVA), which is one of the effective means of longitudinal vibration control. In this paper, an SDVA is designed based on the MRE's magnetic-induced variable stiffness characteristic. Firstly, a mechanical model of the propulsion shaft system with the SDVA is proposed, theoretically discussed and numerically validated. Then, the mechanical performance of the MRE under different magnetic fields is tested. In addition, the magnetic circuit and the overall structure of the SDVA are designed. Furthermore, electromagnetic and thermodynamic simulations are carried out to guarantee the structural design. The frequency shift property of the SDVA is found through dynamic simulations and validated by a frequency shift experiment. Lastly, the vibration absorption capacity of the SDVA is investigated. The results show that the magnetorheological effect of the MRE and the frequency shift of the SDVA are obvious; the SDVA has relatively acceptable vibration absorption capacity.
TL;DR: In this article, a simulation study concerning the low and mid frequencies control of flexural vibration in a lightly damped thin plate equipped with five time-varying shunted piezoelectric patch absorbers is presented.
TL;DR: In this article, the rotational and translational coupling effects that exist in the dynamics of the maneuvering spacecraft with high flexible structures are considered and the active vibration suppression using the modified positive position feedback control law is applied to the spacecraft.
TL;DR: In this paper, a single-driven ultrasonic elliptical vibration cutting (SDUEVC) device with a complex-beam horn (CBH) is introduced and investigated using the theory of mechanical vibration, a mathematical model of the CBH is described.
Abstract: In order to obtain an ultrasonic elliptical vibration device with a simple structure, a novel single-driven ultrasonic elliptical vibration cutting (SDUEVC) device with a complex-beam horn (CBH) is introduced and investigated in this paper. Using the theory of mechanical vibration, a mathematical model of the CBH is described. We studied the vibration characteristic of the SDUEVC using the finite element method (FEM). Experiments were carried out to investigate the vibration characteristics of the SDUEVC device prototype using a vibrometer, an oscilloscope, and a data processing system. In addition, the cutting characteristic of the prototype was verified. Our experimental results show that, compared to conventional cutting (CC), the SDUEVC device can reduce the cutting force and surface roughness.
TL;DR: In this article, a smooth adaptive sliding mode based active vibration control is proposed to suppress the vibration of the smart links, and the first and second modes of the three links are targeted to be suppressed in modal space to avoid the spillover phenomenon.
TL;DR: For linear delay-differential equations, a question of ongoing interest is to determine conditions on the equation parameters that guarantee exponential stability of solutions as mentioned in this paper, and such an idea is presented and exploited in the control of active vibrations.
TL;DR: In this article, a combined finite-impulse response (FIR) and fractional-order RC is proposed to perform harmonic current suppression at arbitrary frequency, where phase compensator is designed to enhance the stability of magnetically suspended rotor system.
Abstract: Magnetically suspended rotor has the characteristics of no friction and active vibration control. The mass unbalance and sensor runout of the rotor induce harmonic current, which will cause harmonic vibration. The ratio of the sampling rate to the fundamental frequency of harmonic current is often not an integer. The existing repetitive control (RC) for the suppression of harmonic current in magnetic bearing is applicable for the integer case. Harmonic current suppression performance is degraded drastically if the ratio is fractional. In this paper, combined finite-impulse response (FIR) and fractional-order RC is proposed. FIR filter and fractional-order RC are combined to perform harmonic current suppression at arbitrary frequency. Phase compensator is designed to enhance the stability of magnetically suspended rotor system. Experimental results are given to verify the effectiveness and superiority of the proposed method.
TL;DR: In this article, the authors propose a method for vibration control in lightly damped systems through concurrent synthesis of passive structural modifications and active state (or state derivative) feedback control gains.
TL;DR: In this article, a nonlinear controller which adjusts the torque acting on the driving gear is proposed to minimize the adverse effect of this time-varying mesh stiffness, and a spur gearbox, which does not emit much noise and vibration is designed.
TL;DR: In this article, an integral aeroelastic and electromechanical solution of concurrent active piezoelectric control and energy harvesting for wing vibrations, with the consideration of the geometrical nonlinear effects of slender multifunctional wings, was developed for the active control of wing vibrations.
Abstract: Both active actuation and energy harvesting of highly flexible wings using piezoelectric transduction are studied in this paper. The piezoelectric effect is included in a strain-based geometrically nonlinear beam formulation. The resulting structural dynamic equations for multifunctional beams are then coupled with a finite-state unsteady aerodynamic formulation, allowing for piezoelectric energy harvesting and actuation with the nonlinear aeroelastic system. With the development, it is possible to provide an integral aeroelastic and electromechanical solution of concurrent active piezoelectric control and energy harvesting for wing vibrations, with the consideration of the geometrical nonlinear effects of slender multifunctional wings. In this paper, linear quadratic regulator and linear quadratic Gaussian controllers are developed for the active control of wing vibrations. The controllers demonstrate effective gust alleviation capabilities. Furthermore, concurrent active vibration control and energy har...
TL;DR: Torsional and bending coupling vibrations between traction motor and driveline are investigated and the system is simulated using MATLAB/Simulink, and the results of the vibration suppression are presented.
Abstract: In electric vehicles (EVs), the source of noise, vibration, and harshness (NVH) involves various components inside/outside of the vehicle. Besides the vibration from each NVH source, the resonances between multiple sources contribute even more significant vibrations. This paper proposes a generalized real-time suppression strategy to mitigate the coupling vibration during vehicle idling and cruising. Using a high-performance field-oriented-controlled electric motor drive, a relatively small amount of rotation velocity offset can be added to the traction motor to significantly reduce the resonant vibration with negligible impact to vehicular speed. In this paper, torsional and bending coupling vibrations between traction motor and driveline are investigated because these two are the most common forced vibrations due to resonances. The system is simulated using MATLAB/Simulink, and the results of the vibration suppression are presented. The strategy proposed in this paper presents a simple and robust way to suppress the coupling vibration in EVs with no additional hardware requirement.