Bibliografie tematiche / Active vibration reduction

Letteratura scientifica selezionata sul tema "Active vibration reduction"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Active vibration reduction":

Dymarek, Andrzej, Tomasz Dzitkowski, Krzysztof Herbuś, Piotr Ociepka e Agnieszka Sękala. "Use of active synthesis in vibration reduction using an example of a four-storey building". Journal of Vibration and Control 26, n. 17-18 (13 gennaio 2020): 1471–83. http://dx.doi.org/10.1177/1077546319898970.

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Abstract (sommario):

The article presents a method of active vibration reduction of vibrating mechanical systems. This method is based on the properties of positive rational functions, which in the case of discrete dynamical systems correspond to the characteristic function describing such systems. The method formalized uses methods for decomposing positive rational functions. The advantage of this approach is taking into account the analytical form of a characteristic function of the system being tested and the vibration-reducing force, as well as the conditions that the system should meet in the event of an active vibration-reducing force. In addition, in the proposed method, the desired dynamic properties of the system and the vibration-reducing force can be defined in such a way that the determined parameters of the active force affect all forms of the natural vibrations of the examined system. Based on the formalized methodology, the force reducing the vibrations of a four-storey frame to the desired displacement amplitude was determined. The impact of the place of application of the specific active force on the reduction of vibration of the tested object was also taken into account. The vibrations of the tested structure’s model were caused by kinematic excitation with a harmonic course and an amplitude corresponding to an earthquake of a magnitude of 5 on the Richter scale. To verify the determined force reducing the vibrations of the object and to create a visualisation of the analysed phenomenon, a dynamic analysis of the building structure was carried out using PLM Siemens NX 12 software.

Białas, K. "The possibility of physical implementation of active vibration reduction". IOP Conference Series: Materials Science and Engineering 1182, n. 1 (1 ottobre 2021): 012007. http://dx.doi.org/10.1088/1757-899x/1182/1/012007.

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Abstract This work presents non-classical method of design of mechanic systems with subsystem reducing vibrations. The purpose of this paper is also introduces synthesis of mechanic system with reducing vibrations understand as design of this type of systems. This work presents method of reduction unwanted vibration by using mechanical elements, electrical elements, magnetorheological damper ect. The use of such a method enables the analysis and synthesis of mechanical systems irrespective of the type and number of the elements of such a system. The purpose of this paper is also introduces synthesis of mechanical system which is the reverse task of dynamics. The result of synthesis is obtaining system meeting the defined requirements. The system was consisted from mechanical elements and sub-system realized by many types of elements. This subsystem is an active or semiactive subsystem which enables overcoming limitations which occur if passive elements are used. The majority of vibration occurring in devices and machines is harmful and has a disadvantageous effect on their condition. Harmful impact of vibration is caused by the occurrence of increased stresses and the loss of energy, which results in faster wear machinery. Introduced in this work approach adopted makes it possible to undertake actions aiming at the elimination of phenomena resulting in the unwanted operation of machinery or generation of hazardous situations in the machinery environment. Thank to the approach, can be conducted as early as during the designing of future functions of the system as well as during the construction of the system.

Mroz, A., A. Orlowska e J. Holnicki-Szulc. "Semi-Active Damping of Vibrations. Prestress Accumulation-Release Strategy Development". Shock and Vibration 17, n. 2 (2010): 123–36. http://dx.doi.org/10.1155/2010/126402.

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Abstract (sommario):

New method for semi-active control of vibrating structures is introduced. So-called Prestress Accumulation-Release (PAR) strategy aims at releasing of the strain energy accumulated in the structure during its deformation process. The strain energy is converted into kinetic energy of higher modes of vibration which is suppressed with structural damping or by means of a damping device. The adaptation process essentially affects the first mode vibrations by introducing an elastic force that opposes the movement. Numerical simulations as well as experimental results prove that the strategy can be very effective in mitigating of the fundamental mode of a free – vibrating structure. In a numerical example 95% of the vibration amplitude was mitigated after two cycles. An experimental demonstrator shows 85% reduction of the amplitude in a cantilever free- vibrations. In much more complex practical problems smaller portion of total energy can be released from the system in each cycle, nevertheless the strategy could be applied to mitigate the vibrations of, for example, pipeline systems or pedestrian walkways.

Bialas, Katarzyna. "Reduction of vibrations in mechanical systems using piezoelectric elements". MATEC Web of Conferences 178 (2018): 06023. http://dx.doi.org/10.1051/matecconf/201817806023.

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Abstract (sommario):

The aim of study is to visualize not only the primary and active element but also sensors, returning the current state of the system. The work shows the use of piezoelectric accelerometer sensors in the active vibration reduction. In addition to the elements reduction of vibrations also are necessary elements with which it will be possible to constantly test and measure vibration. It is necessary to generate the force to appropriate executive to reduce the effects of vibration. It will be also shows how to design basic system in something special way which is the synthesis of mechanical systems.

Ford, Terry. "Vibration reduction and monitoring". Aircraft Engineering and Aerospace Technology 71, n. 1 (1 febbraio 1999): 21–24. http://dx.doi.org/10.1108/00022669910252105.

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Typical passive and active vibration reduction systems are dealt with, particular emphasis being on the Westland active control of structural response system fitted to all versions of the EH101. In addition, the extensive experience acquired during the evolution of vibration health monitoring on North Sea helicopters is outlined.

Tsuji, Hideki, Hiroyuki Itoh, Shinji Mitsuta, Naoyuki Kanayama, Hideaki Kawakami e Yukiyoshi Takayama. "Vibration Reduction of Transfer Feeder by Active Vibration Control." Transactions of the Japan Society of Mechanical Engineers Series C 61, n. 585 (1995): 1867–72. http://dx.doi.org/10.1299/kikaic.61.1867.

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Gaul, L., e J. Becker. "Reduction of Structural Vibrations by Passive and Semiactively Controlled Friction Dampers". Shock and Vibration 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/870564.

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Abstract (sommario):

Reduction of structural vibrations is of major interest in mechanical engineering for lowering sound emission of vibrating structures, improving accuracy of machines, and increasing structure durability. Besides optimization of the mechanical design or various types of passive damping treatments, active structural vibration control concepts are efficient means to reduce unwanted vibrations. In this contribution, two different semiactive control concepts for vibration reduction are proposed that adapt to the normal force of attached friction dampers. Thereby, semiactive control concepts generally possess the advantage over active control in that the closed loop is intrinsically stable and that less energy is required for the actuation than in active control. In the chosen experimental implementation, a piezoelectric stack actuator is used to apply adjustable normal forces between a structure and an attached friction damper. Simulation and experimental results of a benchmark structure with passive and semiactively controlled friction dampers are compared for stationary narrowband excitation. For simulations of the control performance, transient simulations must be employed to predict the achieved vibration damping. It is well known that transient simulation of systems with friction and normal contact requires excessive computational power due to the nonlinear constitutive laws and the high contact stiffnesses involved. However, commercial finite-element codes do not allow simulating feedback control in a general way. As a remedy, a special simulation framework is developed which allows efficiently modeling interfaces with friction and normal contact by appropriate constitutive laws which are implemented by contact elements in a finite-element model. Furthermore, special model reduction techniques using a substructuring approach are employed for faster simulation.

Snamina, Jacek, e Paweł Orkisz. "A Comparison of Active and Semi-Active Sliding Mode Controllers Applied in Vibration Reduction Systems". Solid State Phenomena 248 (marzo 2016): 93–102. http://dx.doi.org/10.4028/www.scientific.net/ssp.248.93.

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The paper presents active and semi-active vibration reduction systems applying sliding mode control systems. Calculations were completed for a laboratory system with two masses moving in a vertical direction. Support of the system is connected with the moving part of the exciter. The proposed system may be a simple model of many vibroisolated objects. In order to apply the control system of vibrations in the suspension of the upper mass, an actuator was implemented together with a spring. The role of the actuator was played by a linear inductive motor.Active and semi-active sliding mode controllers are proposed for the vibration reduction system. Theoretical analysis focused on applying of the sliding mode control in this system was carried out and, moreover, conditions to be met by the controllers were determined. The results of simulations and experiments are presented in tables and plots.

Setareh, Mehdi. "Floor vibration control using semi-active tuned mass dampers". Canadian Journal of Civil Engineering 29, n. 1 (1 febbraio 2002): 76–84. http://dx.doi.org/10.1139/l01-063.

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This paper discusses the application of a new class of semi-active tuned mass dampers, called ground-hook tuned mass dampers (GHTMD), for the reduction of floor vibrations due to human movements. The TMD introduced uses a continuously variable semi-active damper (ground-hook damper) to achieve reduction in the floor acceleration. Here, the GHTMD is applied to a single degree of freedom system representative of building floors. The GHTMD design parameters are defined in terms of non-dimensional values. The optimum values of these parameters are found based on the minimization of the acceleration response of the floor for different GHTMD mass ratios and floor damping ratios. The performance of the GHTMD is compared to that of the equivalent passive TMD. In addition, the effects of off-tuning due to variations in the mass ratios and frequency ratios of the TMD and GHTMD are studied. Comparison of the results demonstrates the efficiency and robustness of GHTMD with respect to equivalent TMD. Finally, a guide for the design of GHTMDs is presented.Key words: floor vibrations, semi-active tuned mass dampers, tuned vibration absorbers, vibration control, ground-hook dampers, human-induced vibrations, annoying vibrations, optimum design parameters.

Dymarek, Andrzej, e Tomasz Dzitkowski. "Reduction Vibration of Mechanical Systems". Applied Mechanics and Materials 307 (febbraio 2013): 257–60. http://dx.doi.org/10.4028/www.scientific.net/amm.307.257.

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Abstract (sommario):

In this work the method of active synthesis of mechanical systems in accordance with the desired frequency spectrum has been formulated and formalised. Active synthesis of a proportional regulation system has been performed in accordance with the method formulated and a verification of the correctness of the results has been carried out.

Più fonti

Tesi sul tema "Active vibration reduction":

Ganguli, ABHIJIT. "Chatter reduction through active vibration damping". Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210980.

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Abstract (sommario):

The aim of the thesis is to propose active damping as a potential control strategy for chatter instability in machine tools.

The regenerative process theory explains chatter as a closed loop interaction between the structural dynamics and the cutting process. This is considered to be the most dominant reason behind machine tool chatter although other instability causing mechanisms exist.

The stability lobe diagram provides a quantitative idea of the limits of stable machining in terms of two physical parameters: the width of contact between tool and the workpiece, called the width of cut and the speed of rotation of the spindle. It is found that the minimum value of the stability limit is proportional to the structural damping ratio for turning operations. This important finding provides the motivation of influencing the structural dynamics by active damping to enhance stability limits of a machining operation.

A direct implementation of active damping in an industrial environment may be difficult. So an intermediate step of testing the strategy in a laboratory setup, without conducting real cutting is proposed. Two mechatronic "Hardware in the Loop" simulators for chatter in turning and milling are presented, which simulate regenerative chatter experimentally without conducting real cutting tests. A simple cantilever beam, representing the MDOF dynamics of

the machine tool structure constitutes the basic hardware part and the cutting process is simulated in real time on a DSP board. The values of the cutting parameters such as spindle speed and the axial width of cut can be changed on the DSP board and the closed loop interaction between the structure and the cutting process can be led to instability.

The demonstrators are then used as test beds to investigate the efficiency of active damping, as a potential chatter stabilization strategy. Active damping is easy to implement, robust and does not require a very detailed model of the structure for proper functioning, provided a collocated sensor and actuator configuration is followed. The idea of active damping is currently being implemented in the industry in various metal cutting machines as part of the European Union funded SMARTOOL project (www.smartool.org), intended to propose smart chatter control technologies in machining operations.
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished

Boffa, John. "Model Reduction of Large Structural Systems for Active Vibration Control". University of Technology, Sydney. Faculty of Engineering, 2006. http://hdl.handle.net/2100/338.

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This thesis studies the applicability of the Dynamic model reduction method that is used for direct plant order reduction in the active vibration control of large and flexible structures. A comparison of the performances between the reduced models produced by the Dynamic model reduction method and those obtained by other common model reduction methods such as the Guyan method, and the Mode-displacement method have been carried out. By using a full analytical model of a twenty storey building as the reference, each three degrees of freedom model was compared by computer simulation. The open-loop frequency response simulation, open-loop earthquake simulation, and the closed-loop earthquake simulation were all used to initially evaluate the reduced models. The accuracy of the frequency responses was assessed with sinusoidal applied forces, and for the closed-loop dynamic analysis, an active mass damper at the top storey and a recorded earthquake excitation was used. When compared with the simulation results of the Guyan method, the Dynamic method has many advantages, especially in terms of its accuracy at the high frequency range. The Mode-displacement method produces reduced models that are good for dynamic analysis of open-loop systems, but it was found to be inconvenient for use in active control. Finally, the Dynamic model reduction method and Guyan method were compared using experimental test results. A 2.5m tall building model with 20 floors was used as the plant, with a linear motor installed at the top storey for the purposes of active-damping. Although the results of simulations would suggest that both models perform sufficiently, experimental testing proved that only the Dynamic model performs adequately for this specific application of active control. The problem associated with most model reduction methods, such as the Guyan, is that they are based on full-order models that were derived from the linear elastic theory. The versatility of the Dynamic model reduction method is such that it provides the option of obtaining system parameters directly from experiment, not just from theory. The experimental procedure ensures that the Dynamic model reduction method forms an accurate description of the real system dynamics. The applicability of this method for obtaining low-order plant models was demonstrated through real-time active control testing of the model structure, while it was subject to a sinusoidal excitation. The tests have shown that the Dynamic model reduction method can be used as an alternative approach for the model reduction of structural systems for the purpose of active vibration control.

Huyanan, Satienpong. "An active vibration absorber for chatter reduction in machining". Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486712.

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Abstract (sommario):

In the early days of the manufacturing industry, the limiting factor in obtaining higher material removal rates was 'Chatter', an unstable cutting condition with excessive vibrations. Maximum productivity can only be obtained using the knowledge of the theory of regenerative chatter. In the era of modem manufacturing industry, where the greater quality and productivity are increasingly demanded, especially the requirement to understand and avoid chatter is even greater. The key answering to this challenge is to increase the rate of material removal while maintaining stable cutting conditions through reducing chatter during machining operations. In this regard, an active vibration absorber can be used to effectively reduce the undesired vibrations of the structure, thereby increasing the border line of chatter stability. However, to date there has been little attention in applying this technique in the application ofmilling chatter suppression, especially for a flexible workpiece. In this thesis, the stability of milling process dynamics is theoretically investigated using the method of semi-discretization. An alternative means of improving stability in milling is also presented by developing the extended method of semi-discretization for the milling systems with variable time delay. This can be used to predict not only the stability but also the chatter frequencies for milling with irregular pitch cutters. Motivated by an interest in practically improving the stability margin in the milling process, a practical and straightforward active vibration control system with acceleration feedback is implemented using a proof-mass actuator. Based on the general framework of virtual passive control, three controller strategies are first demonstrated and evaluated through a laboratory based vibration study, consisting of virtual sky-hook damper, virtual passive absorber and virtual passive-active absorber. TheÃ‚Â· results indicate that virtual passive absorber control could be a simple and robust solution to the application ofmachining chatter reduction. Through the initial study of the theory of regenerative chatter, analytical optimizations of dynamic vibration absorbers are developed for application to chatter suppression. The performance of a virtual passive absorber to suppress workpiece chatter during high speed machining is then experimentally investigated for each tuning scheme, including the virtual sky-hook damper scheme. The results demonstrate that although the performance of the active milling chatter suppression system is limited by the actuator saturation, the chosen control strategy can provide at least a 6-fold improvement in the workpiece stability using a small actuator.

Boffa, John. "Model reduction of large structural systems for active vibration control /". Electronic version, 2002. http://adt.lib.uts.edu.au/public/adt-NTSM20060317.113054/index.html.

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Gan, Zengkang. "Adaptive control of an active seat for occupant vibration reduction". Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665426.

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Abstract (sommario):

Vehicle occupants are typically exposed to unpleasant whole-body vibration (WBV) for extended period of time. It is well known that the transmission of unwanted vibration to the human body can lead to fatigue and discomfort. Moreover, the unwanted vibration normally distributed in the low-frequency range has been found as the main risk factor for lower back pain and lumbago, which seriously affect the health and working performance of occupants. Thus vibration cancellation on seats has attracted considerable interest in recent years. So far, for most vehicle seats, vibration isolation is achieved passively by using seat cushions and conventional energy absorbers, which have very limited performance in the low-frequency range. The work presented in this thesis forms a successful development and experimental study of an active seat and control algorithm for occupants’ WBV reduction under low frequency excitations. Firstly, a modelling study of the seat human subjects (SHS) and an extensive experimental measurement of the vibration transmissibility of a test dummy and vehicle seat are carried out. The biodynamic responses of SHS exposed to uncoupled vertical and fore-and-aft WBV is modelled. A comparison with the existing models is made and the results show that an improved fit with the aggregated experimental data is achieved. Secondly, an active seat is developed based upon the observations and understanding of the SHS and seat system. The characteristics of the active seat dynamics are identified through experimental tests found suitable for the development of an active seat to attenuate the vibration experienced by vehicle occupants. The vibration cancellation performance of the active seat is initially examined by feedforward plus proportional-integral (PI) control tests. Through these tests, the effectiveness of the actuators control authority is verified, but the limitations are also revealed. Because the active seat system is subject to non-linear and time-varying behaviour, a self-tuning fully adaptive algorithm is a prime requirement. The Filtered-x Least-Mean-Square (FXLMS) algorithm with the Fast-block LMS (FBLMS) system identification technique is found suitable for this application and is investigated through experimental tests. Substantial vibration reductions are achieved for a variety of input vibration profiles. An excellent capability of the active seat and control system for efficiently reducing the vibration level of seated occupants under low-frequency WBV is demonstrated.

Martinovic, Zoran N. "Sensitivity of active vibration control to structural changes and model reduction". Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/53641.

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Abstract (sommario):

The analytical study presented here is concerned with by two types of sensitivity of active vibration control of large space structures (LSS). The first one required for assessing robustness, is the sensitivity of the performance and stability of the control system to changes in structure and to model reduction. The second type is the sensitivity of the optimum design of the control system to changes in the structure. This sensitivity is of interest in assessing the need for integrated structure/control design. Three direct rate feedback (DRF) control techniques are studied for a laboratory structure which has characteristics of LSS and then compared to standard linear quadratic (LQ) control. The baseline design of each control system is obtained first and then sensitivity analysis conducted. An uncoupled DRF control law which minimized the sum of gains subject to requirements on performance was not robust to structural changes, and small changes in the structure caused notable increase in performance compared to that of the baseline design and therefore a potential gain from simultaneous structure/control design was indicated. Two coupled DRF techniques are proposed. A Minimum Force DRF (MF-DRF) law minimized maximum force of any actuator, while a Linear Quadratic DRF (LQ-DRF) law minimized the standard quadratic performance index for initial conditions in the shape of the first six natural modes. Both techniques guaranteed system stability. The LQ control law was found to be only slightly better than the simpler MF·DRF law in terms of the quadratic performance index and poorer than the LQ-DRF law. However the LQ control requires model reduction and was found to be sensitive to errors in that process. For example, the LQ design lost its stability when the structure was modified by adding a non-structural mass to it. A separate experimental study was conducted simultaneously with this study to verify theoretical results. Good agreement was found between analytical results and experimental measurements for the investigated control techniques.
Ph. D.

LI, MINGFENG. "ACTIVE VIBRATION CONTROL OF A GEARBOX SYSTEM WITH EMPHASIS ON GEAR WHINE REDUCTION". University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1115131866.

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Clements, Kristen Lynn. "Active control of an automobile suspension system for reduction of vibration and noise". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30359.

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Abstract (sommario):

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 79-82).
A new method for controlling road noise transmitted through the suspension system of an automobile was developed, using a Lincoln LS automobile as the target vehicle. In this vehicle, road surface roughness generates vibrations that are transmitted into the automobile primary through a single bushing (the "point 4 bushing") on each of the front suspension control arms. An electromagnetic actuator was designed, built, and tested on a Lincoln LS with simulated roads noise. The actuator applies a force across the point 4 bushing, in response to accelerations of the vehicle frame, just inboard of the bushing, with the goal of reducing the net forces transmitted into the vehicle frame, which ultimately produce unwanted interior noise. Several tonal controllers were developed, each designed to operate in a narrow frequency band, and to eliminate the cross member (frame) vibration just inside the point 4 bushing. The tonal controllers were able to eliminate cross member vibration at the desired frequency. Eliminating the cross member vibration resulted in modest reductions interior sound levels. A successful vibration control system (in this vehicle) would need to eliminate cross member vibrations over frequency range 100 to 200 Hz. However, a broadband controller with this electromagnetic actuator system proved to be difficult, due to undesirable non-minimum phase dynamics.
by Kristen Lynn Clements.
S.M.

Curtis, A. R. D. "The theory and application of quadratic minimization in the active reduction of sound and vibration". Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/52272/.

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Abstract (sommario):

Active sound reduction is the use of active sources of sound, that is devices which are potentially sources of sound energy, to modify a preexisting sound field in such a way that the overall effect is a reduction in sound. Until recently the most common approach in active sound control was to attempt to achieve complete cancellation of the sound. This is possible at single points but is practically impossible over an appreciable region. A more modest and practical aim is to try to reduce the sound field by as much as possible by minimizing some overall measure of the amplitude of the sound field. This thesis examines the technique of sound field minimization. Candidate sound field measures which are suitable for minimization are presented and discussed. The quantities include acoustic energy, intensity and power flow as well as a practical measure, the sum of the squares of the signals from a number of sensors. Theoretical simulations and experimental implementations are used to evaluate sound field minimization techniques. The discussion and experiments are extended to the active reduction of structural vibrations.

Becker, Jens. "Semi-active control of friction dampers and feedforward tracking control design for structural vibration reduction". Tönning Lübeck Marburg Der Andere Verl, 2009. http://d-nb.info/995846200/04.

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Libri sul tema "Active vibration reduction":

Quelling cabin noise in turboprop aircraft via active control. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Quelling cabin noise in turboprop aircraft via active control. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Jansen, Maarten. Noise Reduction by Wavelet Thresholding. Springer London, Limited, 2012.

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Jansen, Maarten. Noise Reduction by Wavelet Thresholding. Springer, 2012.

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Jansen, Maarten. Noise Reduction by Wavelet Thresholding. Springer, 2001.

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Capitoli di libri sul tema "Active vibration reduction":

Landau, Ioan Doré, Tudor-Bogdan Airimitoaie, Abraham Castellanos-Silva e Aurelian Constantinescu. "Reduction of the Controller Complexity". In Adaptive and Robust Active Vibration Control, 171–84. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41450-8_9.

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Krzyzynski, Tomasz, Igor Maciejewski, Lutz Meyer e Henning Meyer. "A Method of Shaping the Vibro-isolation Properties of Semi-active and Active Systems". In Modelling and Control Design of Vibration Reduction Systems, 155–80. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03047-6_8.

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Platz, Roland, Serge Ondoua, Georg C. Enss e Tobias Melz. "Approach to Evaluate Uncertainty in Passive and Active Vibration Reduction". In Model Validation and Uncertainty Quantification, Volume 3, 345–52. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04552-8_34.

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Chagraoui, Hamda, Mourad Saidi e Mohamed Soula. "Unbalance Vibration Reduction of High-Speed Turbochargers Using Active Magnetic Actuator". In Advances in Mechanical Engineering and Mechanics II, 369–75. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86446-0_49.

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Dzitkowski, Tomasz, e Andrzej Dymarek. "The Active Synthesis in Vibration Reduction Using the Example of Driving Systems". In Modelling in Engineering 2020: Applied Mechanics, 61–72. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68455-6_6.

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Chomette, Baptiste, Simon Chesné, Didier Rémond e L. Gaudiller. "Vibration Damage Reduction of On-Board Electronic Boards Using Modal Active Control". In Emboding Intelligence in Structures and Integrated Systems, 551–56. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908158-13-3.551.

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Schmidt, Adam. "The Design of an Active Structural Vibration Reduction System Using a Modified Particle Swarm Optimization". In Lecture Notes in Computer Science, 544–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15461-4_55.

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Belyankova, T. I., V. V. Kalinchuk, W. Hubert e G. Schmid. "Peculiarities of vibrations of a layered inhomogeneous medium under the action of a load moving on its surface". In Wave propagation Moving load – Vibration Reduction, 79–84. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003211372-10.

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Jarzyna, Wojciech, Michał Augustyniak, Jerzy Warmiński e Marcin Bocheński. "Evaluation of Suppression Methods Used for Reduction of Vibrations of the Active Composite Beam". In Frontiers in Computer Education, 709–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27552-4_94.

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Inoue, R., Y. Hashimoto e Y. Yokoyama. "Theoretical study on phase interference method for passive reduction of multiple excitation forces – reduction method of vibration due to rhythmic action of concert audience". In Environmental Vibrations: Prediction, Monitoring, Mitigation and Evaluation (ISEV 2005), 445–52. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003209379-66.

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Atti di convegni sul tema "Active vibration reduction":

Gaul, Lothar, e Jens Becker. "Vibration Reduction by Passive and Semi-Active Friction Joints". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65190.

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Reduction of structural vibrations is of major interest in mechanical engineering for lowering sound emission of vibrating structures, improving accuracy of machines and increasing structure durability. Besides optimization of the mechanical design or various types of passive damping treatments, active structural vibration control concepts are efficient means to reduce unwanted vibrations. In this contribution, two different semi-active control concepts for vibration reduction are proposed that adapt the normal force of attached friction dampers. Thereby, semi-active control concepts generally possess the advantage over active control that the closed loop is intrinsically stable and that less energy is required for the actuation than in active control. In the chosen experimental implementation, a piezoelectric stack actuators is used to apply adjustable normal forces between a structure and an attached friction damper. Simulation and experimental results of a benchmark structure with passive and semi-actively controlled friction dampers are compared for stationary narrow-band excitation.

Rogov, I. E., e L. N. Ananchenko. "ACTIVE VIBRATION REDUCTION IN AGRICULTURAL MACHINERY". In INNOVATIVE TECHNOLOGIES IN SCIENCE AND EDUCATION. DSTU-Print, 2020. http://dx.doi.org/10.23947/itno.2020.243-247.

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In article possibility of active suppression of vibrations of elements of a design of agricultural machinery is investigated. It is shown that it is possible to achieve the effective suppression of vibrations without the use of complex and expensive technical solutions, complex and time-consuming calculations and without conducting many experiments. The results of experimental research into active vibration suppression are covered.

Henriot, Philippe, Michel Verge e Gerard Coffignal. "Model reduction for active vibration control". In SPIE's 7th Annual International Symposium on Smart Structures and Materials, a cura di Norman M. Wereley. SPIE, 2000. http://dx.doi.org/10.1117/12.388869.

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Bartel, Torsten, Sven Herold, Francesco Infante, Johannes Kasgen, Michael Matthias, Jonathan Millitzer e Sara Perfetto. "Active Vibration Reduction of Ship Propulsion Systems". In 2018 Joint Conference - Acoustics. IEEE, 2018. http://dx.doi.org/10.1109/acoustics.2018.8502373.

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Sakamoto, Kosuke, e Yasunori Kobayashi. "Development of Active Noise Control System Optimized for Road Noise Reduction". In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-1040.

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<div class="section abstract"><div class="htmlview paragraph">In this paper, a newly developed Active Noise Control (ANC) system is introduced, that effectively reduces road noise, which becomes a major issue with electrified vehicles, and that enhances vehicle interior sound levels matching seamless acceleration by electric drive. Conventionally, reducing road noise using ANC requires numerous sensors and speakers, as well as a processor with high computing power. Therefore, the increase in system cost and the complexity of the system are obstacles to its spread. To overcome these issues, this system is developed based on four concepts. The first is a modular system configuration with unified interface to apply to various vehicle types and grades. The second is the integration and optimal placement of noise source reference sensors to achieve both reduction in number of parts and noise reduction performance. The third is the application of digital communications that combine power superposition, low latency, and high throughput to reduce wiring. The fourth is the development of control technologies that specialize in in-vehicle acoustic characteristics to achieve both computational efficiency and noise reduction performance. The one is a technology to integrate control paths based on the sound field mode characteristics in the vehicle cabin, and another one is the frequency band restrain control technology that matches speaker output characteristics. It is confirmed that this proposed system achieves quietness improvement equivalent to the difference of vehicle segmentation with a minimum system configuration, and that this system has a high superiority in weight efficiency compared to conventional vehicle body measures.</div></div>

Boldering, Alexander L., Marc Simnofske, Annika Raatz e Ju¨rgen Hesselbach. "Active Vibration Reduction to Optimize the Grinding Process". In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86976.

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High production quality and processing velocity characterizes an efficient machine tool. Higher velocities lead to increasing process forces, hence the stiffness of the machine must be high. Especially in grinding, the dynamic stiffness of a machine influences the process stability enormously. The stability of the grinding process is affected by the specification of the grinding wheel, machine parameters and the condition of the workpiece. Chattering is simply a consequence of vibration within a grinding system. At present, parts of the machine tools (structures, drives, measuring systems, etc.) are constantly being improved. However, a better performance can only be achieved by applying innovative basic approaches. In this paper, a grinding machine with integrated active modules is presented. The aim of the modules, which consist of piezo actuators and force transducers, is to increase the static and dynamic stiffness of the structure and minimize vibrations.

Wilson, Scott D., Jonathan Metscher e Nicholas A. Schifer. "Active Vibration Reduction of the Advanced Stirling Convertor". In 14th International Energy Conversion Engineering Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-5015.

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Swanson, Douglas, e Guy Billoud. "Aircraft cabin noise reduction through active vibration control". In 5th AIAA/CEAS Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-1935.

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Pereira da Silva, Heitor Antônio, e Rodrigo Nicoletti. "Vibration Reduction of Flexible Shaft with Active Bearing". In 27^th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2023. http://dx.doi.org/10.26678/abcm.cobem2023.cob2023-1826.

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Corr, Lawrence R., e William W. Clark. "Comparison of Active and Hybrid Vibration Confinement With Conventional Active Vibration Control". In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8303.

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Abstract This paper presents a numerical study in which active and hybrid vibration confinement is compared with a conventional active vibration control method. Vibration confinement is a vibration control technique that is based on reshaping structural modes to produce “quiet areas” in a structure as opposed to adding damping as in conventional active or passive methods. In this paper, active and hybrid confinement is achieved in a flexible beam with two pairs of piezoelectric actuators and sensors and with two vibration absorbers. For comparison purposes, active damping is achieved also with two pairs of piezoelectric actuators and sensors using direct velocity feedback. The results show that both approaches are effective in controlling vibrations in the targeted area of the beam, with direct velocity feedback being slightly more cost effective in terms of required power. When combined with passive confinement, however, each method is improved with a significant reduction in required power.

Rapporti di organizzazioni sul tema "Active vibration reduction":

Fuller, Chris R. A Distributed Active Vibration Absorber (DAVA) and Associated Control Approaches for Active-Passive Reduction of Sound and Vibration. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2001. http://dx.doi.org/10.21236/ada389507.

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OPTIMIZATION OF STIFFNESS AND DAMPING COEFFICIENTS OF CONNECTION DAMPERS TO REDUCE THE DYNAMIC RESPONSE OF TRANSMISSION LINE STEEL TOWERS SUBJECTED TO WIND ACTION. The Hong Kong Institute of Steel Construction, settembre 2023. http://dx.doi.org/10.18057/ijasc.2023.19.3.6.

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Tall and slender latticed steel towers, such as power transmission line towers, are very susceptible to vibrations imposed mainly by wind action. Thus, changing the design layout or making use of vibration control devices is often necessary to reduce vibration amplitudes and avoid the collapse of the structure. In this work, an alternative to the conventional types of commercial dampers is the use of elements in the connections of the structure, such as rubber rings working like connection dampers, so they can dissipate the energy of the system reducing the dynamic response of the tower. Thus, this work proposes a methodology for the optimization of stiffness and damping coefficients of connection dampers in structures of latticed steel towers of Transmission Lines (TL) that are subjected to the dynamic effects of wind. An illustrative example is presented. First, the structure is evaluated considering perfectly rigid connections; then the stiffness and damping coefficient of the connections are optimized in order to minimize the vibration amplitudes of the tower. Finally, the natural frequencies, damping ratios and maximum horizontal displacements are compared for situations of perfectly rigid and semi-rigid connections. The results show that the optimization process results in a structure with a fundamental frequency of vibration similar to that of the original tower, however a significant reduction in the horizontal displacements can be observed, since an increase in damping occurs, thus proving the capacity of the proposed methodology.