Journal articles: 'Active vibration reduction'

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Dymarek, Andrzej, Tomasz Dzitkowski, Krzysztof Herbuś, Piotr Ociepka, and Agnieszka Sękala. "Use of active synthesis in vibration reduction using an example of a four-storey building." Journal of Vibration and Control 26, no. 17-18 (January 13, 2020): 1471–83. http://dx.doi.org/10.1177/1077546319898970.

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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.

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Białas, K. "The possibility of physical implementation of active vibration reduction." IOP Conference Series: Materials Science and Engineering 1182, no. 1 (October 1, 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.

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Mroz, A., A. Orlowska, and J. Holnicki-Szulc. "Semi-Active Damping of Vibrations. Prestress Accumulation-Release Strategy Development." Shock and Vibration 17, no. 2 (2010): 123–36. http://dx.doi.org/10.1155/2010/126402.

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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.

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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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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.

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Ford, Terry. "Vibration reduction and monitoring." Aircraft Engineering and Aerospace Technology 71, no. 1 (February 1, 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.

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Tsuji, Hideki, Hiroyuki Itoh, Shinji Mitsuta, Naoyuki Kanayama, Hideaki Kawakami, and Yukiyoshi Takayama. "Vibration Reduction of Transfer Feeder by Active Vibration Control." Transactions of the Japan Society of Mechanical Engineers Series C 61, no. 585 (1995): 1867–72. http://dx.doi.org/10.1299/kikaic.61.1867.

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Gaul, L., and 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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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.

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Snamina, Jacek, and Paweł Orkisz. "A Comparison of Active and Semi-Active Sliding Mode Controllers Applied in Vibration Reduction Systems." Solid State Phenomena 248 (March 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.

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Setareh, Mehdi. "Floor vibration control using semi-active tuned mass dampers." Canadian Journal of Civil Engineering 29, no. 1 (February 1, 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.

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

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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.

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Kim, Sang-Un, and Joo-Yong Kim. "Comparative Performance Analysis of Inverse Phase Active Vibration Cancellation Using Macro Fiber Composite (MFC) and Vibration Absorption of Silicone Gel for Vibration Reduction." Polymers 15, no. 24 (December 11, 2023): 4672. http://dx.doi.org/10.3390/polym15244672.

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This study focuses on addressing the issue of unwanted vibrations commonly encountered in various fields by designing an Active Vibration Cancellation (AVC) structure using a flexible piezoelectric composite material macro fiber composite (MFC). A comparative performance analysis was conducted between the AVC and a traditional passive gel that continuously absorbs vibrations. The results showed that AVC was more effective in mitigating vibrations, making it a promising solution for vibration control. The results of this study from extensive vibration–sensing experiments and comparisons revealed that AVC effectively cancels the vibrations and vibration absorption performance of the passive gel. These findings underline the potential of AVC as an efficient method for eliminating and managing undesired vibrations in practical applications. Specifically, AVC demonstrated a high vibration cancellation ratio of approximately 0.96 at frequencies above 10 Hz. In contrast, passive gel exhibited a relatively consistent vibration absorption ratio, approximately 0.70 to 0.75 at all tested frequencies. These quantitative findings emphasize the superior performance of AVC in reducing vibrations to levels below a certain threshold, demonstrating its efficacy for vibration control in real-world scenarios.

12

Sero, Kazuto. "Noise reduction by an active vibration controller." Journal of the Acoustical Society of America 84, S1 (November 1988): S49. http://dx.doi.org/10.1121/1.2026337.

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Białas, Katarzyna, and Andrzej Buchacz. "Active reduction of vibration of mechatronic systems." Ekspolatacja i Niezawodnosc - Maintenance and Reliability 17, no. 4 (September 16, 2015): 528–34. http://dx.doi.org/10.17531/ein.2015.4.7.

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ADOBES, A. "NOISE REDUCTION DUE TO ACTIVE VIBRATION DAMPING." Le Journal de Physique Colloques 51, no. C2 (February 1990): C2–769—C2–772. http://dx.doi.org/10.1051/jphyscol:19902179.

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Białas, Katarzyna, Andrzej Buchacz, and Damian Gałęziowski. "Application of Electric Subsystem as Implementation of Reduction of Mechanical Vibrations." Solid State Phenomena 220-221 (January 2015): 9–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.9.

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This work presents methods of reduction of the vibration of mechanical systems by means of active elements as well as examples of implementation of active reduction of vibration by means of electrical elements [1], [2]. This work also describes a structural and parametric synthesis, which can be defined as the design of systems meeting specific requirements. These requirements refer to the frequency values of the systems’ vibration. The presented approach i.e. a non-classical synthetic method applied in designing mechanical systems with elements reducing unwanted vibrations. As a result of the synthesis, one can obtain the structure and parameters of the system of required properties. The synthesis may also be applied to modify the already existing systems in order to achieve a desired result [1–3].

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Chraponska, Anna, Jaroslaw Rzepecki, Chukwuemeke William Isaac, Krzysztof Mazur, and Marek Pawelczyk. "Spectral Analysis of Macro-Fiber Composites Measured Vibration of Double-Panel Structure Coupled with Solenoids." Sensors 20, no. 12 (June 21, 2020): 3505. http://dx.doi.org/10.3390/s20123505.

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Noise may have a negative impact on humans health and well being. Noise is a direct result of the vibration of structures. Many industrial workers and people using household appliances may be exposed to these harmful factors. To minimize their negative consequences, different approaches to noise and vibration reduction may be applied, e.g., active, semi-active or passive methods. In this research, a semi-active approach to vibration reduction of a cubic rigid casing enclosing a noise- and vibration-generating device is presented. One of the casing walls consists of double thin steel panels, coupled with the use of electromagnetic dampers—solenoids installed in the space between the panels. Other casing walls are built of single plywood panels. Vibrations of the outer (radiating) panel of the wall are measured by Macro-Fiber Composite patches. Spectral analysis of structure vibration is carried out to identify the benefits of the proposed coupling solution in terms of vibration reduction of the wall. The frequency range, where vibration reduction is observed, depends on the number of activated solenoids and the duty cycle of a Pulse Width Modulation (PWM) signal. Advantages and drawbacks of the proposed method are discussed and future improvements of the examined setup are suggested.

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Werner, Ulrich. "Analysis of Active Vibration Reduction for Soft Mounted Electrical Machines Based on a Multibody Model." International Journal of Applied Mechanics 08, no. 08 (December 2016): 1650085. http://dx.doi.org/10.1142/s175882511650085x.

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The aim of the paper is to analyze active vibration reduction of soft mounted electrical machines by using actuators between the motor feet and a soft foundation based on a multibody model. The actuator forces are inserted directly in the vibration model without using a feedback control system. The goal is to reduce the forced vibrations, which are caused by typical excitations of electrical motors — eccentricity of rotor mass, bent rotor deflection and magnetic eccentricity. Based on the simplified model, the mathematical coherences are derived and a numerical example is shown, where different vibration reduction concepts are analyzed and the necessary actuator forces are calculated. The aim of the paper is to show the capability of using actuators between motor feet and soft foundation, based on a simplified multibody vibration model. For future work, the multibody model has to be implemented into a feedback control system for active vibration control.

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Wang, Qunsheng, Jing Zeng, Yi Wu, and Bin Zhu. "Study on semi-active suspension applied on carbody underneath suspended system of high-speed railway vehicle." Journal of Vibration and Control 26, no. 9-10 (January 8, 2020): 671–79. http://dx.doi.org/10.1177/1077546319889863.

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Considering the coupling vibration of a flexible carbody and the underneath suspended equipment, a vertical coupled vibration model of a high-speed train was constructed. A roller test rig was conducted to validate the theoretical model. To reduce carbody elastic vibration, the semi-active vibration reduction models based on the Sky-hook and the linear quadratic regulator control strategies were proposed. The semi-active suspension system was installed between the carbody and the suspended equipment, and the influence of the semi-active suspension on carbody vibration reduction was analyzed. The results show that the semi-active suspension can significantly reduce carbody vibration, especially at high operating speeds. The higher the elastic vibration of carbody, the better the vibration reduction effect of the semi-active suspension. Compared with the passive suspension and the semi-active suspension, the semi-active suspension of the Sky-hook control has a relatively wider vibration control range, and has an obvious effect on carbody rigid and elastic vibration reduction. Although the semi-active suspension of the linear quadratic regulator control had little influence on the rigid carbody vibration, it could reduce most of the elastic carbody vibration.

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Dymarek, Andrzej, and Tomasz Dzitkowski. "Inverse Task of Vibration Active Reduction of Mechanical Systems." Mathematical Problems in Engineering 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/3191807.

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The paper presents the problem of discrete vibration reduction in mechanical systems depending on the desired dynamic properties. The conditions for physical feasibility of dynamic characteristics have been defined, in the form of impedance and mobility, for passive and active vibration reduction. The authors have presented a graphic method for determining the free vibration drop coefficient, based on the desired value of the reduced resonance frequency amplitude.

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Kobayashi, T., H. Ushitani, H. Wada, J. Inoue, T. Kawakami, and H. Sugi. "EFFECT OF MECHANICAL VIBRATION ON ACTIVE TENSION IN THE LONGITUDINAL RETRACTOR MUSCLE OF A SEA CUCUMBER STICHOPUS JAPONICUS." Journal of Experimental Biology 194, no. 1 (September 1, 1994): 319–28. http://dx.doi.org/10.1242/jeb.194.1.319.

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1. The effect of mechanical vibration on active tension in an echinoderm somatic smooth muscle was studied using the longitudinal retractor muscle (LRM) of a sea cucumber Stichopus japonicus. 2. The steady contracture tension in LRM fibres maximally activated with 10(-3) mol l-1 acetylcholine (ACh) was reduced by vibrations (peak-to-peak amplitude, 0.52.5 % of l0, where l0 is the slack length of the muscle; frequency, 5100 Hz). The extent of reduction of active contracture tension increased with increasing amplitude of vibration, but it did not change appreciably with increasing frequency of vibration. 3. The steady contracture tension in LRM fibres submaximally activated with 10(-5) mol l-1 ACh was more markedly reduced by vibrations than was that in maximally activated fibres. 4. The vibration-induced reduction of active contracture tension disappeared when temperature was lowered from 2023 to 0 °C. 5. The development of contracture tension in LRM fibres activated with ACh was not affected by mechanical vibration. 6. These results are discussed in connection with the vibration-induced decrease in the rate of breakage of the actinmyosin linkages responsible for isometric force generation.

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Wang, Yi, and Thomas Kletschkowski. "Semi-Active Vibration Control Based on a Smart Exciter with an Optimized Electrical Shunt Circuit." Applied Sciences 11, no. 20 (October 11, 2021): 9404. http://dx.doi.org/10.3390/app11209404.

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A smart exciter coupled to cabin panels can be used as a new type of loudspeaker for emergency announcements in the aircraft cabin. The same device can also be used as a semi-active vibration control system which is effective in reducing the amplitude of structural vibration. The objective of this paper is to investigate the potential of vibration reduction using a smart exciter in combination with an optimized resistive-inductive shunt circuit, which serves as an absorbing network. First, the vibration reduction effect has been analyzed numerically using a simulation framework realized with COMSOL and MATLAB/Simulink. In a second step, the reduction effect of the smart exciter together with a resistive-inductive shunt circuit, which is produced by the Center of Applied Aeronautical Research (Zentrum für Angewandte Luftfahrtforschung GmbH, Hamburg, Germany), has been investigated experimentally. The results presented here prove that the smart exciter together with a resistive-inductive shunt can be highly effective in reducing structural vibrations.

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Białas, Katarzyna. "Passive and Active Elements in Reduction of Vibrations of Torsional Systems." Solid State Phenomena 164 (June 2010): 260–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.260.

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The adverse effects of vibrations on the performance of machines and their environment are the subject of various studies. That is why already in the machine design stage the designers have to face the problem of preventing undesirable effects in the functioning of new machines as well as adapting complete machines to the requirements resulting from the current knowledge on hazards caused by these machines. There are a number of methods for preventing excessive vibrations, which have an impact on machine sub-assemblies and elements. In particular, the passive, semi-active and active vibration-reducing systems can be distinguished [4,5].

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SON, Lovely, and Susumu HARA. "2922 Digital Control Simulation of Shock Vibration Reduction Using Active Momentum Exchange Impact Damper." Proceedings of the JSME annual meeting 2008.5 (2008): 149–50. http://dx.doi.org/10.1299/jsmemecjo.2008.5.0_149.

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Saldaña, Israel de Jesús, Andrés Rodríguez-Torres, Wen Yu, and Jesús Morales-Valdez. "Semiactive vibration control for vibration reduction in buildings through ADRC." Memorias del Congreso Nacional de Control Automático 5, no. 1 (October 17, 2022): 7–12. http://dx.doi.org/10.58571/cnca.amca.2022.006.

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In this paper an Active Disturbance Reflection Control (ADRC) technique is proposed for semi-active vibration control for building structures. The ADRC objective is to reduce the displacement of the building, regulating the force of a magnetorheological damper to provide rigidity to the structure and thus cancel the effects of seismic disturbances. In addition, an algebraic state estimator is proposed to estimate the displacement and velocity required by the ARDC. Simulation results validate the performance of the proposed scheme.

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Koo, Kyung-Rae, Hyun-Guk Kim, Dong-Geon Kim, Seong-Cheol Kwon, and Hyun-Ung Oh. "Lightweight Design for Active Small SAR S-STEP Satellite Using Multilayered High-Damping Carbon Fiber-Reinforced Plastic Patch." Aerospace 10, no. 9 (August 31, 2023): 774. http://dx.doi.org/10.3390/aerospace10090774.

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In the launch environment, satellites are subjected to severe dynamic loads. These dynamic loads in the launch environment can lead to the malfunction of the payload, or to mission failure. In order to improve the structural stability of satellites and enable the reliable execution of space missions, it is necessary to have a reinforcement structure that reduces structural vibrations. However, for active small SAR satellites, the mass requirements are very strict, and this makes it difficult to apply an additional structure for vibration reduction. Therefore, we have developed a carbon fiber-reinforced plastic (CFRP)-based laminated patch to obtain a vibration reduction structure with a lightweight design for improving the structural stability of an S-STEP satellite. To verify the vibration reduction performance of the CFRP-based patch, sine and random vibration tests were conducted at the specimen level. Finally, the structural stability of the S-STEP satellite with the proposed CFRP-based laminated patch was experimentally verified using sine and random vibration tests. The validation results indicate that the CFRP-based laminated patch is an efficient solution which can effectively reduce the vibration response without the need for major changes to the design of the satellite structure. The lightweight vibration reduction mechanism developed in this study is one of the best solutions for protecting vibration-sensitive components.

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Białas, Katarzyna. "Electrical Elements in Reduction of Mechanical Vibrations." Applied Mechanics and Materials 371 (August 2013): 657–61. http://dx.doi.org/10.4028/www.scientific.net/amm.371.657.

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This work presents methods of reduction of the vibration of mechanical systems by means of active elements as well as examples of implementation of active reduction of vibration by means of electrical elements [. This work also describes a structural and parametric synthesis, which can be defined as the design of systems meeting specific requirements. These requirements refer to the frequency values of the systems vibration. The presented approach i.e. a non-classical synthetic method applied in designing mechanical systems, one (as early as at the design and construction stage) may verify future systems [1-. This work presents the description of vibration reduction methods. The most popular methods are passive, active and semi-active. An important aspect of this work is the presentation of several possibilities of the physical implementation of active subsystems. In examples active subsystems consisted of the following electric elements is coil with a movable core. In this work is presents influence of electrical subsystem to basic mechanical system. Designer should analyse the resultant systems and investigate the interaction between the subsystems and the basic system [4-.

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Wrona, Stanislaw, and Marek Pawelczyk. "Feedforward Control of a Light-Weight Device Casing for Active Noise Reduction." Archives of Acoustics 41, no. 3 (September 1, 2016): 499–505. http://dx.doi.org/10.1515/aoa-2016-0048.

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Abstract It is possible to enhance acoustic isolation of the device from the environment by appropriately controlling vibration of a device casing. Sound insulation efficiency of this technique for a rigid casing was confirmed by the authors in previous publications. In this paper, a light-weight casing is investigated, where vibrational couplings between walls are much greater due to lack of a rigid frame. A laboratory setup is described in details. The influence of the cross-paths on successful global noise reduction is considered. Multiple vibration actuators are installed on each of the casing walls. An adaptive control strategy based on the Least Mean Square (LMS) algorithm is used to update control filter parameters. Obtained results are reported, discussed, and conclusions for future research are drawn.

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Białas, Katarzyna. "Mechanical Subsystem as Implementation of Active Reduction of Vibration." Solid State Phenomena 198 (March 2013): 657–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.198.657.

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The main objective of this work is to present a reverse task of the dynamics of discrete vibratory mechanical systems. This task is reverse to analysis and is called structural and parametric synthesis. As a result of performing the synthesis one obtains a structure and values of individual parameters of the system of required properties. Such properties refer to the determination of individual frequencies of the system vibration. Synthesis is divided into two stages. The first stage consists in definition of the structure as well as the values of parameters of a passive system without vibration reduction. In the second phase, one selects a method of vibration reduction as well as system structure and parameters with vibration-reducing elements. In case of already-existing systems, the first stage consists in the identification of the system and its analysis. There are no changes in the second stage (Figure 1) [. Another objective of this work is to use mechanical elements in the form of kinematic excitations as the implementation of active reduction of vibration as well as to check the influence of this subsystem on the basic system. The application of the synthesis presented in this work enables the correction of the already-existing machines and devices as well as the modification of newly-created systems with the view of their future functioning.

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Mazur, Krzysztof, and Marek Pawelczyk. "Virtual Microphone Control for an Active Noise-Cancelling Casing." Solid State Phenomena 248 (March 2016): 57–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.248.57.

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An active noise-canceling casing is very attractive for reduction of sound generated bydevices. Such casing can provide good noise reduction for low frequencies, where a passive barrierwould be too thick for practical use. The classical active noise control approach, where the goal is tominimize the sound pressure level around multiple microphones outside the casing can be used. However,it requires placing external microphones, what makes the overall technical solution not acceptedfor many applications. The active vibration control, where the goal is to minimize vibrations of allplates, requires only sensors on the plates. However, in this solution, in turn, noise reduction resultsare worse. This paper presents employment of the idea of the virtual microphone-based approach toimprove results from the system based on vibration sensors only, which are used to estimate acousticpressure at specific locations in the acoustic field. By using a two-stage structure, the system is tunedto reconstruct the same vibrations of the plates, which were present when the acoustic pressure wereminimized directly in the square sense. A laboratory active noise-canceling casing used for experimentsis made of 5 actively controlled aluminum plates mounted on a steel frame. It is passivelyisolated from the floor. On each plate, three electrodynamical actuators are installed. The controlsystem is experimentally verified and obtained results are reported.

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KAKINOUCHI, TSUTOMU, TOSHIO ASANO, KOJI TANIDA, and NORIO TAKAHASHI. "ACTIVE MASS DAMPER DEMONSTRATION FOR SHIP VIBRATION REDUCTION." Naval Engineers Journal 104, no. 4 (July 1992): 85. http://dx.doi.org/10.1111/j.1559-3584.1992.tb01125.x.

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KAKINOUCHI, TSUTOMU, TOSHIO ASANO, KOJI ANIDA, and NORIO TAKAHASHI. "Active Mass Damper Demonstration for Ship Vibration Reduction." Naval Engineers Journal 104, no. 3 (May 1992): 46–52. http://dx.doi.org/10.1111/j.1559-3584.1992.tb02223.x.

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Oh, Jooseon, Woo-Jin Chung, Hyun-Woo Han, Ji-Tae Kim, Gwan-Hee Son, and Young-Jun Park. "Evaluation of Tractor Ride Vibrations by Cab Suspension System." Transactions of the ASABE 63, no. 5 (2020): 1465–76. http://dx.doi.org/10.13031/trans.13795.

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HighlightsTractor ride vibrations were evaluated under various conditions according to type of cab suspension.Ride vibrations were measured on flat and bumpy roads using four tractors with different cab suspension types.Tractors with hydro-pneumatic suspension exhibited smaller ride vibrations than tractors with rubber mounts.Semi-active hydro-pneumatic control resulted in smaller ride vibrations than those resulting from passive control.Abstract. In this study, tractor ride vibrations were evaluated under various conditions according to the type of cab suspension, and the effects of different cab support methods on these ride vibrations were determined. Ride vibrations on flat and bumpy roads were measured using four tractors equipped with different cab suspension types and were analyzed based on ISO Standard 2631-1 for human exposure to whole-body vibration. The ride vibration values were evaluated using the weighted root mean square acceleration and fourth-power vibration dose value. The results confirmed that the tractor equipped with semi-active hydro-pneumatic cab suspension at the two rear positions yielded smaller ride vibrations than the tractors with rubber mounts at all four positions. Vibration reduction effects of up to 53.8% and 67.1% were yielded in the flat road test and bumpy road test, respectively. In addition, among the two tractors with hydro-pneumatic cab suspension systems, ride vibrations were reduced by approximately 7.1% in the tractor that used semi-active control as compared to the tractor that used passive control. Keywords: Hydro-pneumatic cab suspension, Ride vibration, Rubber mount, Whole-body vibration.

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Singhose, W. E., L. J. Porter, T. D. Tuttle, and N. C. Singer. "Vibration Reduction Using Multi-Hump Input Shapers." Journal of Dynamic Systems, Measurement, and Control 119, no. 2 (June 1, 1997): 320–26. http://dx.doi.org/10.1115/1.2801257.

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Input shaping is a method for reducing residual vibrations in computer-controlled machines. Vibration is eliminated by convolving an input shaper, which is a sequence of impulses, with a desired system command to produce a shaped input. The shaped input then becomes the command to the system. Requiring the vibration reduction to be robust to modeling errors and system nonlinearities is critical to the success of the shaping process on any real system, Input shapers can be made very insensitive to parameter uncertainty; however, increasing robustness usually increases system delays. A design process is presented that generates input shapers with insensitivity-to-time-delay ratios that are much larger than traditionally designed input shapers. The advantages of the new shapers are demonstrated with computer simulations and their performance is verified with experimental results from the MIT Middeck Active Control Experiment, which was performed on board the Space Shuttle Endeavor.

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Guo, Zimu, Sipei Zhao, Benjamin J. Halkon, and Lee Clemon. "Simulation of active vibration control of a moving stage." Journal of the Acoustical Society of America 154, no. 4_supplement (October 1, 2023): A164. http://dx.doi.org/10.1121/10.0023139.

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Active vibration control (AVC) has gained considerable interest due to its inherent adaptability and cost-effectiveness, with its ability to suppress vibrations in the controlled system across various applications. Existing studies focus on the AVC of non-moving systems and usually assume that the vibration signal to be controlled is known and can serve as the ideal reference signal in feedforward control systems. However, in many practical applications, the ideal reference signal is not accessible, and a sensor must be used to detect the reference signal. This can degrade the AVC performance, especially for a moving system. This study, therefore, aims to explore the potential application of piezoelectric stack actuators (PSA) to control the vibration of a moving stage driven by a stepper motor. The secondary path was estimated offline, and vibration data were collected at different moving speeds. The effects of the location of the reference sensor were initially investigated. Then, extensive simulations were conducted to evaluate the performance of different adaptive control algorithms regarding vibration reduction, convergence speed, computational complexities, etc. This research underlines the potential of integrating PSA within a moving system to effectively control its vibration.

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Hong, Dongwoo, and Byeongil Kim. "Quantification of Active Structural Path for Vibration Reduction Control of Plate Structure under Sinusoidal Excitation." Applied Sciences 9, no. 4 (February 18, 2019): 711. http://dx.doi.org/10.3390/app9040711.

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The engines of electric and hybrid vehicles cause vibration and noise with complex frequency spectra. This tendency is observed especially for mid-frequency components. Therefore, there are limitations in achieving vibration attenuation using only structural changes, which is the conventional isolation method. A smart structure-based active engine mounting system is a core technology that can continuously improve the noise, vibration, and harshness performance under various operating conditions by continuously controlling the dynamic characteristics of the mount. It can replace the existing mount technology which supports the engine by realizing both static and dynamic stiffness. This study focuses on vibration reduction for a typical mid-frequency excitation. Based on a source–path–receiver structure, a mathematical model for a 3D plate structure with three active paths is proposed. The amplitude and phase of the actuator were calculated for the reduction of given vibrations on the basis of the model. When controlling with the proposed method, it was necessary to perform a large amount of computation and to newly define the modeling according to the structural change. To solve this inconvenience, the NLMS (normalized least mean squares) algorithm was applied, and the results were compared. It is shown that the application of the NLMS algorithm to perform the overall vibration reduction is more effective than the previous method.

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Zhang, Dayu, and Cong Guan. "Active Vibration Control of Robot Gear System Based on Adaptive Control Algorithm." Journal of Sensors 2022 (July 4, 2022): 1–8. http://dx.doi.org/10.1155/2022/4481296.

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With the aim of solving the errors of gear transmission system in the actual manufacturing process, processing and installation, and solving the the vibration and noise of the gear system caused by the deformation brought about by external excitation such as motor load and actuator, which seriously threaten the safety and stability of unit equipment, a novel active vibration suppression structure of multistage gear system with built-in piezoelectric actuator is designed to generate active control force, and it can be used on the shaft. An active controller is designed and established using FxLMS adaptive algorithm. The results of this method show that by measuring the vibration signal system, the base frequency of the high-speed gear pair is 310 Hz, and the basic frequency of the low-speed gear pair is 192 Hz. I had the adaptation snare go for almost 0.5 seconds, with a difference of 0.52%. Adaptive Trap II reached in 1 second, with a difference of 0.96%. In the active vibration suppression test, the basic frequency of the high-speed gear pair is 804 Hz, and the basic frequency of the low-speed gear connector is 500 Hz. Using the FxLMS adaptive algorithm, it is able to effectively suppress the frequency vibrations of the high-speed dual-gear and low-speed dual-gear coupling systems of multispeed gears. After being controlled by FxLMS algorithm at the second frequency of the high-speed gear, the vibration reduction is about 10 dB at the third frequency of the low-speed gear. The vibration reduction is also approximately 7 dB. This has proved that a new experiment of industrial safety can be used to accelerate the movement of gear vibrations using the FxLMS adaptation algorithm.

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Minardo, Aldo, Agnese Coscetta, Salvatore Pirozzi, and Luigi Zeni. "Brillouin Optical Time Domain Analysis Sensor for Active Vibration Control of a Cantilever Beam." Journal of Sensors 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/1351378.

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The paper reports the use of a distributed optical fiber sensor based on stimulated Brillouin scattering, for structural vibration control. A cantilevered flexible aluminum beam was used as test-bed for vibration control. The proposed approach allows acquiring simultaneously the dynamic strain at several locations. The dynamic strain measured at one (or more) fiber location can be used to implement any vibration control algorithm. Experimental results are reported in which a voice coil, positioned near the fixed end of the cantilever beam, was employed as actuator for the reduction of the vibrations related to the first bending mode of the beam.

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Johnson, Marty E., Luiz P. Nascimento, Mary Kasarda, and Chris R. Fuller. "The Effect of Actuator and Sensor Placement on the Active Control of Rotor Unbalance." Journal of Vibration and Acoustics 125, no. 3 (June 18, 2003): 365–73. http://dx.doi.org/10.1115/1.1569946.

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This paper investigates both theoretically and experimentally the effect of the location and number of sensors and magnetic bearing actuators on both global and local vibration reduction along a rotor using a feedforward control scheme. Theoretical approaches developed for the active control of beams have been shown to be useful as simplified models for the rotor scenario. This paper also introduces the time-domain LMS feedforward control strategy, used widely in the active control of sound and vibration, as an alternative control methodology to the frequency-domain feedforward approaches commonly presented in the literature. Results are presented showing that for any case where the same number of actuators and error sensors are used there can be frequencies at which large increases in vibration away from the error sensors can occur. It is also shown that using a larger number of error sensors than actuators results in better global reduction of vibration but decreased local reduction. Overall, the study demonstrated that an analysis of actuator and sensor locations when feedforward control schemes are used is necessary to ensure that harmful increased vibrations do not occur at frequencies away from rotor-bearing natural frequencies or at points along the rotor not monitored by error sensors.

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An, Kang Hyeon, Sang Kwon Lee, Soo Hyun Shin, and Dae Won Jang. "Active vibration control for reduction of interior noise caused by R-MDPS." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 8 (November 30, 2023): 190–93. http://dx.doi.org/10.3397/in_2023_0045.

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This paper presents an active vibration control (AVC) to reduce the vibration of motor driven power steering (MDPS). The MDPS used in the experiment was R-MDPS, an MDPS connected to Rack Gear. When the R-MDPS generates vibration in the operating state, the vibration is transmitted through the subframe. The vibration transmitted through the subframe generates indoor noise and reduces the driving quality of the driver. To reduce vibration, the AVC was used by inserting an actuator between R-MDPS and subframe. The actuator used Piezo material is called a Piezo actuator. To select the location of the actuator, Transfer path analysis (TPA) was performed. the effect was confirmed by setting the main path to error point. The experiment was conducted for feasibility by connecting R-MDPS and subframe to a test bench manufactured in the laboratory. The algorithm used for vibration control used the Filtered-X Least Mean Square (FxLMS) algorithm and the control result was reduced from 4 to 5 dB. It is shown that proposed method is an effective vibration reduction effect of R-MDPS.

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Mohammed, Hadeer Abd UL-Qader, and Hatem Rahem Wasmi. "Active Vibration Control of Cantilever Beam by Using Optimal LQR Controller." Journal of Engineering 24, no. 11 (October 30, 2018): 1. http://dx.doi.org/10.31026/j.eng.2018.11.01.

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Many of mechanical systems are exposed to undesired vibrations, so designing an active vibration control (AVC) system is important in engineering decisions to reduce this vibration. Smart structure technology is used for vibration reduction. Therefore, the cantilever beam is embedded by a piezoelectric (PZT) as an actuator. The optimal LQR controller is designed that reduce the vibration of the smart beam by using a PZT element. In this study the main part is to change the length of the aluminum cantilever beam, so keep the control gains, the excitation, the actuation voltage, and mechanical properties of the aluminum beam for each length of the smart cantilever beam and observe the behavior and effect of changing the length of the smart cantilever beam. A cantilever beam with piezoelectric is modeled in Mechanical APDL ANSYS version 15.0 and verified this by using experimental work. The AVC was tested on a smart beam under different control gains in experimental work and chose the best control gain depending on FEM results for each length of the smart beam. The response of the smart beam is noticed to be different for every length and the reduction percentage for settling time was different for every length.

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An, Kanghyun, Jiseon Baek, Sang-Kwon Lee, Daewon Jang, and Soohyun Shin. "Active Vibration Control of Motor Driven Power Steering for Reduction of Interior Noise." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 266, no. 2 (May 25, 2023): 709–17. http://dx.doi.org/10.3397/nc_2023_01_1043.

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This study presents a novel active vibration control (AVC) system on motor driven power steering (MDPS) to reduce interior noise reduction caused by operating the MDPS in an electric vehicle. MDPS is electronic power steering (EPS). The MDPS attached to the rack gear of power steering system is called R-MDPS. Operating of the R-MDPS generates a structural vibration of R-MDPS, and the vibration is transmitted to car body through mounts of car subframe. The vibrating body of car becomes a monopole and dipole sources of vibroacoustic noise generated inside car. This vibracoustic noise is a structure borne noise and makes passenger annoyance. To reduce interior noise inside a car directly, active noise control (ANC) has been used as active method and is a useful method for active cancellation of the low frequency noises less than 400Hz. However, in this study, because the frequency range of interior noise due to operation of R-MDPS is higher than 400Hz, the AVC system is employed and is applied to active cancellation of the vibration transmitted to car body through the subframe mounts. For application of AVC to test car, the control force is required and the actuator for generation of control force should be install on the mounts. For application of AVC to test car, the control force is required and the actuator for generation of control force should be inserted in the mount between subframe and R-MDPS. It requires an extra rework of test car. In this study to study the feasibility for the application of AVC system to R-MDPS, the test jig, which composes of R-MDPS and subframe of test car, is made and is set up in the laboratory. All study on AVC is performed in the laboratory. The proposed method is successfully applied to the active cancellation of vibration at target point of subframe. The developed method is going to be applied to the AVC of real test vehicle.

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Sibielak, Marek, Waldemar Rączka, and Jarosław Konieczny. "Modified Clipped-LQR Method for Semi-Active Vibration Reduction Systems with Hysteresis." Solid State Phenomena 177 (July 2011): 10–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.177.10.

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Smart materials are being applied more and more widely in semi-active vibration reduction systems. Actuators built with their use are characterized by nonlinearities and hysteretic effects. Their omission in mathematical descriptions may lead to deterioration of the vibration reduction systems. For that reason, it is important to take into account these negative phenomena associated with the actuators at the controller synthesis stage. One method for determining the control laws in semi-active vibration reduction systems that is frequently discussed in academic literature is “Clipped-LQR”. The present paper proposes modification of that method to allow inclusion in the controller synthesis of the hysteretic properties and other nonlinearities of an actuator. The method developed was verified by determining the controller for the semi-active suspension of a machine operator’s seat. A magnetorheological damper was used as an actuator. The dynamic properties of the foam covering of the operator’s seat were included in model. Simulation tests were performed on the vibration reduction system and function of vibration transmissibility was determined. The semi-active vibration reduction system tested was compared to a passive system. The considerations presented herein relate to the semi-active suspension of a machine operator’s seat, and the method presented may be applied to other controlled systems with many degrees of freedom.

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Dalli, Uğbreve;ur, and Şcedilefaatdin Yüksel. "Identification of Flap Motion Parameters for Vibration Reduction in Helicopter Rotors with Multiple Active Trailing Edge Flaps." Shock and Vibration 18, no. 5 (2011): 727–45. http://dx.doi.org/10.1155/2011/675791.

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An active control method utilizing the multiple trailing edge flap configuration for rotorcraft vibration suppression and blade loads control is presented. A comprehensive model for rotor blade with active trailing edge flaps is used to calculate the vibration characteristics, natural frequencies and mode shapes of any complex composite helicopter rotor blade. A computer program is developed to calculate the system response, rotor blade root forces and moments under aerodynamic forcing conditions. Rotor blade system response is calculated using the proposed solution method and the developed program depending on any structural and aerodynamic properties of rotor blades, structural properties of trailing edge flaps and properties of trailing edge flap actuator inputs. Rotor blade loads are determined first on a nominal rotor blade without multiple active trailing edge flaps and then the effects of the active flap motions on the existing rotor blade loads are investigated. Multiple active trailing edge flaps are controlled by using open loop controllers to identify the effects of the actuator signal output properties such as frequency, amplitude and phase on the system response. Effects of using multiple trailing edge flaps on controlling rotor blade vibrations are investigated and some design criteria are determined for the design of trailing edge flap controller that will provide actuator signal outputs to minimize the rotor blade root loads. It is calculated that using the developed active trailing edge rotor blade model, helicopter rotor blade vibrations can be reduced up to 36% of the nominal rotor blade vibrations.

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Yan, W. Y., and A. M. Al-Jumaily. "Feasibility of using an active actuator for two-dimensional vibration abatement in a turning process." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 216, no. 4 (December 1, 2002): 335–42. http://dx.doi.org/10.1243/146441902320992428.

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This paper presents a simulation model that considers the radial and tangential vibrations and their abatement using active actuators in a turning process. The model is simulated using Simulink in a MATLAB environment to assess the possibility of using an active actuator to reduce vibrations in two directions. Comparison is made between the two orthogonal actuators scenario and the one inclined actuator scenario. The results indicate that vibration reduction using an active inclined actuator is comparable with that using two orthogonal actuators.

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Ding, Hu, and J. C. Ji. "Vibration control of fluid-conveying pipes: a state-of-the-art review." Applied Mathematics and Mechanics 44, no. 9 (September 2023): 1423–56. http://dx.doi.org/10.1007/s10483-023-3023-9.

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AbstractFluid-conveying pipes are widely used to transfer bulk fluids from one point to another in many engineering applications. They are subject to various excitations from the conveying fluids, the supporting structures, and the working environment, and thus are prone to vibrations such as flow-induced vibrations and acoustic-induced vibrations. Vibrations can generate variable dynamic stress and large deformation on fluid-conveying pipes, leading to vibration-induced fatigue and damage on the pipes, or even leading to failure of the entire piping system and catastrophic accidents. Therefore, the vibration control of fluid-conveying pipes is essential to ensure the integrity and safety of pipeline systems, and has attracted considerable attention from both researchers and engineers. The present paper aims to provide an extensive review of the state-of-the-art research on the vibration control of fluid-conveying pipes. The vibration analysis of fluid-conveying pipes is briefly discussed to show some key issues involved in the vibration analysis. Then, the research progress on the vibration control of fluid-conveying pipes is reviewed from four aspects in terms of passive control, active vibration control, semi-active vibration control, and structural optimization design for vibration reduction. Furthermore, the main results of existing research on the vibration control of fluid-conveying pipes are summarized, and future promising research directions are recommended to address the current research gaps. This paper contributes to the understanding of vibration control of fluid-conveying pipes, and will help the research work on the vibration control of fluid-conveying pipes attract more attention.

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Chen, Yong, Shao Zhang, Jiaxin Chang, Amin Fereidooni, and Viresh Wickramasinghe. "Development of a multiaxis active seat mount to mitigate helicopter aircrew whole-body vibration exposure." Journal of Intelligent Material Systems and Structures 30, no. 17 (April 17, 2019): 2544–55. http://dx.doi.org/10.1177/1045389x19844027.

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This article presents the development and evaluation of a proof-of-concept multiaxis and actively controlled helicopter seat mount for aircrew whole-body vibration reduction. The multiaxis seat mount is designed to be installed between the helicopter seat floor and the seat supporting structure to minimize the impact on crashworthiness requirements of the helicopter seat. The design involves multiple miniature force actuators to counteract the vibrations of the seat frame and occupant transmitted from the helicopter floor in three orthogonal directions. The actuators are controlled by an adaptive feedforward filtered-x least mean square algorithm to cancel the helicopter floor vibration input. The prototype active seat mount design was tested in various configurations with a shaker table providing representative Bell-412 helicopter vibration inputs. Test results demonstrated that the vibrations of the seat frame and mannequin occupant body were suppressed simultaneously, and the major N/rev harmonic peaks of the occupant’s whole-body vibration were reduced by more than 20 dB. This demonstrated that the multiaxis active seat mount design can mitigate the whole-body vibration exposure of the helicopter aircrew to improve their ride quality and reduce adverse health effect.

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Graf, P. L., and R. Shoureshi. "Modeling and Implementation of Semi-Active Hydraulic Engine Mounts." Journal of Dynamic Systems, Measurement, and Control 110, no. 4 (December 1, 1988): 422–29. http://dx.doi.org/10.1115/1.3152706.

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In an effort to improve passenger comfort, the automotive industry is evaluating more sophisticated techniques to reduce engine excited frame vibrations. A new approach is to implement hydraulic mounts in a semi-active mode. In this mode, low power actuators are used to change the impedance characteristics of the mount. This paper presents a dynamic model and analysis of the semi-active hydraulic mount. Experimental data confirming the mount model are presented. Finally, results of an experimental study on the implementation of the semi-active mounts on a production automotive vehicle are presented. The study focuses on frame vibration reduction during engine idle. The semi-active hydraulic mounts show improved vibration levels over passive hydraulic mounts in the vehicle application.

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Murakami, Tomohiro, Ming Yang, Hiroshi Kishi, Sigeki Mori, Masahiro Ohkawa, and Eiichi Fujino. "Reducing Blanking Vibration with Active Vibration Control Using a Servo Press." Key Engineering Materials 716 (October 2016): 510–20. http://dx.doi.org/10.4028/www.scientific.net/kem.716.510.

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Blanking noise and blanking vibration are causes of pollution. At the same time, blanking vibration disturbs the high precision of a press work product, and shortens the life expectancy of the press machine and the press die. Recently, the use of a servo press has been developed to improve these problems, using low speed blanking and pulse vibration banking. However, these methods lengthen the blanking time, so it is necessary to control the servo press properly in the case of blanking. In this study, we describe a principle for the reduction of blanking vibration when using a servo press, and we propose an active vibration control method for the reduction of blanking vibration. We used a crank servo press of 450kN in an experiment, which has a pulse motion of 10Hz. We conducted a simulation and an experiment of blanking using an active vibration control method, which we named “counter pulse blanking.” We confirmed that counter pulse blanking is effective in reducing vibration as a result of the simulation and the experiment.

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Bialas, K. "Selection of active elements in system reduction of vibration." IOP Conference Series: Materials Science and Engineering 161 (November 2016): 012021. http://dx.doi.org/10.1088/1757-899x/161/1/012021.

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Li, Dawei, Jinhao Qiu, Hongli Ji, and Rui Nie. "Shear stress and noise metric reduction using active vibration." Progress in Computational Fluid Dynamics, An International Journal 16, no. 5 (2016): 322. http://dx.doi.org/10.1504/pcfd.2016.078751.

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Journal articles on the topic 'Active vibration reduction'

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