Journal articles: 'Electrodisharge generator of elastic vibrations'

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Kvasov, I. N., K. Yu Fetisov, M. A. Aleksandrov, and A. A. Gladenko. "Well productivity and reservoir recovery enhancement with using vibration wave impact technology." Oil and Gas Studies, no. 4 (September 9, 2021): 73–83. http://dx.doi.org/10.31660/0445-0108-2021-4-73-83.

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The use of physical fields of elastic vibrations in methods of increasing well productivity and oil recovery is presented. Borehole hydrodynamic generators of elastic vibrations are the most preferable for performing vibration-wave treatments of the bottom-hole zone. Many generator designs lack reasonable parameters for the generated pressure fluctuations. In this regard, it is necessary a bench and oilfield research practice of hydrodynamic generators various designs with an objective hardware assessment of their operating parameters.

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Cherpakov, Alexander V., Ivan A. Parinov, and Rakesh Kumar Haldkar. "Parametric and Experimental Modeling of Axial-Type Piezoelectric Energy Generator with Active Base." Applied Sciences 12, no. 3 (February 7, 2022): 1700. http://dx.doi.org/10.3390/app12031700.

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A computational and experimental approach to modeling oscillations of a new axial-type piezoelectric generator (PEG) with an attached mass and an active base is considered. A pair of cylindrical piezoelements located along the generator axis is used as an active base. Plate-type piezoelectric elements, made in the form of two bimorphs on an elastic PEG base, use the potential energy of PEG bending vibrations. Energy generation in cylindrical piezoelectric elements occurs due to the transfer of compressive forces to the piezoelectric element at the base of the PEG during excitation of structural vibrations. The active load scheme is selected separately for each piezoelectric element. Numerical simulation was performed in the ANSYS FE analysis package. The results of modal and harmonic analysis of vibrations are presented. A technique for experimental analysis of vibrations is presented, and a laboratory test setup is described. Numerical and experimental results are presented for the output characteristics of a piezoelectric generator at a low-frequency load. For one of the versions of the generator and a certain displacement amplitude for a frequency of 39 Hz, in the results of a comparative experimental analysis at a load of 10 kΩ, the maximum output power for each cylindrical piezoelectric element was 2138.9 μW, and for plate-type piezoelectric elements, respectively, 446.9 μW and 423.2 μW.

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Kuievda, Yu V., and S. M. Baluta. "PARAMETER IDENTIFICATION METHOD OF THE TURBINE-GENERATOR SHAFT ELASTIC MODEL FOR TORSIONAL VIBRATIONS SIMULATION." Praci Institutu elektrodinamiki Nacionalanoi akademii nauk Ukraini 2017, no. 47 (July 18, 2017): 37–44. http://dx.doi.org/10.15407/publishing2017.47.037.

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Zumbach, M., G. Schweitzer, and K. Schoellhorn. "On-Line Thermal Balancing Technique for a Large Turbo-Generator." Journal of Vibration and Acoustics 114, no. 1 (January 1, 1992): 60–66. http://dx.doi.org/10.1115/1.2930235.

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In this paper a new technique is proposed to rebalance automatically a large turbo-generator during operation. The sensitivity of the rotor unbalances to thermal asymmetries in the rotor is exploited by mounting some heating elements and using them as actively controlled actuators. The shaft vibrations are measured and used as input signals of the feedback controller. Unbalances thus can be compensated during rotor operation. A theoretical model of the thermo-elastic rotor has been developed and an appropriate closed-loop control system has been designed. The simulation results are verified on a special test rig with digital control allowing for varioius control strategies and various operating conditions.

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Guzev, Mikhail, Evgenii Kozhevnikov, Mikhail Turbakov, Evgenii Riabokon, and Vladimir Poplygin. "Experimental Studies of the Influence of Dynamic Loading on the Elastic Properties of Sandstone." Energies 13, no. 23 (November 25, 2020): 6195. http://dx.doi.org/10.3390/en13236195.

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Under dynamic loading, the geomechanical properties of porous clastic rocks differ from those in quasistatic loading. A small experimental rig was built to directly assess the influence of vibrations on the uniaxial compressive strength (UCS), Young modulus, and Poisson’s ratio. A piezoelectric actuator powered by a signal from an oscillator was used in the rig as a generator of vibrations. A laser sensor and eddy current probe measured the longitudinal and transverse deformation. Tinius Hounsfield and Instron Series 4483 installations were used to determine the geomechanical properties of new red sandstone in a quasistatic regime. The boundaries of elastic deformations determined in the quasistatic loading were implemented in the dynamic loading. To perform the experiments in the elastic zone (on the graph of stress (σ)–strain (ε)), small samples with diameters ranging between 7.5 and 24.7 mm were manufactured. The investigation demonstrated that the Young’s modulus of the sandstone increased with increasing values of the dynamic load and frequency.

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Tsvetkov, G., and V. Kostitsyn. "Increase of Accuracy of Well Bottom Position Determination by Minimization of Seismic Vibration Finding Errors." Applied Mechanics and Materials 682 (October 2014): 154–59. http://dx.doi.org/10.4028/www.scientific.net/amm.682.154.

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In the given work, on the basis of the carried out researches at the decision of seismic surveying tasks an attempt on advancement of methods and means of excitation of elastic vibrations by the generator of seismic vibrations (GSV) is made. The geometry of the real GSV differs from the ideal axially symmetric form resulting in deviations of parameters of geometry of mass (deviations of the centre of mass, main central axes of inertia), and is a consequence of the static and dynamic disbalance.The character of forces and moments acting on the GSV, as a whole and on separate units, depends on quality of the law of change of total force of resistance of escapement and return of plunger; dynamic loads resuling in occurrence of transverse waves at excitation of seismic vibrations deterioting the accuracy of determination of well bottom position are formed.

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Soloviev, A. N., and D. A. Ermakov. "Mathematical and Computer Modeling of Piezoelectric Generator for Energy Harvesting Devices." Mathematics and Mathematical Modeling, no. 1 (May 20, 2019): 1–14. http://dx.doi.org/10.24108/mathm.0119.0000176.

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The paper deals with modeling a Piezoelectric Generator (PEG) that includes piezoactive elements, inertial mass, plate and rack. The PEG under consideration can be an element of the energy storage device in the capacity of the source of energy provided from vibrations of elements of structures and machines.The main objective of the paper is to gain the PEG efficiency by finding the optimal geometric parameters for finding the highest output potential.The elastic and piezoceramic media are modeled within the framework of the linear theory of electroelasticity. As a research tool, CAE package ACELAN is used in which three-dimensional and axisymmetric device models are built. The numerical experiments performed a modal and harmonic analysis that enabled us to identify the most effective operating frequencies.

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Wolszczak, Piotr, Grzegorz Litak, and Krystian Lygas. "Analysis of dynamics of a vertical cantilever in rotary coupling to the moving frame with movement limiters." MATEC Web of Conferences 241 (2018): 01021. http://dx.doi.org/10.1051/matecconf/201824101021.

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The efficiency of the mechanical energy harvesting with the use of vibrating elements can be improved by synchronizing stimulation vibrations and own linear frequencies of systems as well as super or sub harmonics induced by non-linear phenomena. The article presents numerical cross-sectional study of the mechanical system. The system consists of an elastic beam set vertically, which the lower end is fixed in the rotary support, and is stimulated to move in the horizontal axis. The upper end of the beam is free but below its level there are bumpers limiting the free rotation of the beam. Numerical studies took into account the variability of the frequency and amplitude of the excitation beam movement, and horizontal distance between bumpers. Beam deflection was observed, on the basis of which the amount of energy generated by the piezo element was estimated. Nonlinear phenomena and analysis of frequency synchronization of vibrations improving the energy effect of an energy generator are presented.

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Xiang, Ling, Shixi Yang, and Chunbiao Gan. "Torsional Vibration of a Shafting System under Electrical Disturbances." Shock and Vibration 19, no. 6 (2012): 1223–33. http://dx.doi.org/10.1155/2012/986769.

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Torsional vibration responses of a nonlinear shafting system are studied by a modified Riccati torsional transfer matrix combining with the Newmark-βmethod. Firstly, the system is modeled as a chain consisting of an elastic spring with concentrated mass points, from which a multi-segment lumped mass model is established. Secondly, accumulated errors are eliminated from the eigenfrequencies and responses of the system's torsional vibration by this newly developed procedure. The incremental transfer matrix method, combining the modified Riccati torsional transfer matrix with Newmark-βmethod, is further applied to solve the dynamical equations for the torsional vibration of the nonlinear shafting system. Lastly, the shafting system of a turbine-generator is employed as an illustrating example, and simulation analysis has been performed on the transient responses of the shaft's torsional vibrations during typical power network disturbances, such as three-phase short circuit, two-phase short circuit and asynchronous juxtaposition. The results validate the present method and are instructive for the design of a turbo-generator shaft.

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Ragulskis, Kazimieras. "Mechanical systems of precise robots with vibrodrives, the vibrating mass of the exciting force of which performs impacts into deformable support and direction of the exciting force coincides with the line of relative motion of the system." Mechanics 27, no. 5 (October 12, 2021): 408–14. http://dx.doi.org/10.5755/j02.mech.27470.

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Manipulator consisting from one sided self stopping mechanism and two masses which interact through an elastic – dissipative member is investigated. The drive of the manipulator is the generator of mechanical vibrations. With such elements the system is nonlinear. A separate case is investigated when static positions of equilibrium of both masses are located in one point. Because of this spectrums of eigenfrequencies are linear and infinite. All those facts mean that the operation of the manipulator is optimal. Fast development of robots gives rise to the investigations of increasing intensity creating various types of robots especially in the area of high precision. Mechanical systems of robot must perform laws and trajectories of motion, positioning in space with highest possible precision as well as ensure dynamicity of highest possible stability. Those aims are achieved in the presented paper by creating a structure of the best design, based on vibroimpacts as well as by choosing corresponding nonlinear parameters of the system. The investigation is performed by analytical – numerical method. The obtained results enable to create mechanical systems for precise robots.

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Döllinger, M., M. Schuster, U. Eysholdt, U. Hoppe, and J. Lohscheller. "The Laryngectomee Substitute Voice: Image Processing of Endoscopic Recordings by Fusion with Acoustic Signals." Methods of Information in Medicine 42, no. 03 (2003): 277–81. http://dx.doi.org/10.1055/s-0038-1634361.

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Summary Objectives: The most radical cancer therapy of the throat is the total excision of the larynx which postoperatively results in the loss of voice. A widely-used method of voice rehabilitation is the insertion of a silicone valve, which establishes an unidirectional connection between trachea and esophagus. Thus, during exhalation, air can be directed from the trachea into the esophagus. This air stream excites tissue vibrations of the esophagus and the hypo-pharynx which act as a substitute voice generator. Purpose of the current study is to present a technique for visualizing the dynamics of the substitute voice generating element. Methods: Digital high speed videos of the vibrating tissue are simultaneously recorded with the emitted acoustic signal. The high speed sequences are directly evaluated by a three-step knowledge based algorithm. It considers correlation between image and acoustic data, information about the gray value of each pixel, and continuity of tissue vibration. The temporal properties of an image series are investigated by evaluating the time dependent gray value at each pixel position. Results: The applicability of the algorithm is exemplar-ily demonstrated using the data of one male patient. It enables the identification of the regions within an image series which are mainly responsible for the acoustic signal. Additionally, the dynamics of tissue vibrations are visualized. The main propagation direction can be clearly identified. Conclusions: The new methodology summarizes the information about endoscopic and acoustic recordings of substitute voice into a single image. The results allow a first estimation of tissue velocity and elastic properties of oscillating tissue.

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Hosseini, Soheil, Saharnaz Aghebatandish, Abdolrahman Dadvand, and Boo Cheong Khoo. "An immersed boundary-lattice Boltzmann method with multi relaxation time for solving flow-induced vibrations of an elastic vortex generator and its effect on heat transfer and mixing." Chemical Engineering Journal 405 (February 2021): 126652. http://dx.doi.org/10.1016/j.cej.2020.126652.

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Mikoshiba, Kota, James M. Manimala, and CT Sun. "Energy harvesting using an array of multifunctional resonators." Journal of Intelligent Material Systems and Structures 24, no. 2 (September 23, 2012): 168–79. http://dx.doi.org/10.1177/1045389x12460335.

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Energy harvesting from structural vibrations using an array of multifunctional resonators based on the theory of locally resonant materials is demonstrated. Such locally resonant structures exhibit a stop band for elastic wave propagation. The band gap frequency range depends on the local resonance frequency of the microstructure. One method to realize this is through the use of an array of embedded resonators where the external work done is stored as kinetic energy of the internal mass when the forcing frequency is close to the local resonance frequency. This mechanism can be used to harvest energy by converting the kinetic energy into electrical energy, thus bestowing a multifunctional utility to the structure. We use a spring-loaded magnet enclosed in a capped poly(methyl methacrylate) tube equipped with copper coils to create a unit cell that acts both as a resonator and as a linear generator. Experiments on a serial array of seven unit cells exhibit a band gap between 146.5 (local resonance frequency) and 171 Hz with a peak voltage generation of 3.03 V at steady state. The continuous effective power generated by a single unit cell across a 1-Ω load resistor is 36 mW, indicating the feasibility of constructing vibration isolation structures that can power simple electronic and microelectromechanical systems devices. The applicability of using the device as a transducer to measure the local resonance frequency and the global resonance frequency of the structure is also discussed.

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Минасян, М. А., Ц. Цзэн, and А. М. Минасян. "Preparation of reasonable initial data for analytical and experimental studies of torsional vibrations of the universal diesel generator set DG-8.83." MORSKIE INTELLEKTUAL`NYE TEHNOLOGII, no. 2(48) (May 24, 2020). http://dx.doi.org/10.37220/mit.2020.48.2.052.

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Крутильные колебания упруго-массовых систем относятся к тем опасным динамическим нагрузкам, которые могут приводить к аварийным повреждениям валов, упругих муфт и других элементов энергетических установок с дизельным приводом. Указанные особенности побудили авторов на первом этапе аналитических и экспериментальных исследований крутильных колебаний универсальной дизель – генераторной установки ДГ-8,83 подготовить обоснованные исходные данные. Для этой цели определены моменты инерции и податливости элементов крутильной системы по известным эмпирическим формулам, по методу конечных элементов и частично экспериментально. Затем на основе анализа и обобщения полученных результатов проведен обоснованный выбор моментов инерции и податливостей в качестве уточненных исходных данных. На базе выбранных исходных данных авторы намерены приступить к расчету крутильных колебаний с жестким и упругим соединением дизеля с генератором. Для обеспечения точности аналитических и экспериментальных исследований крутильных колебаний других дизельных установок авторы рекомендуют, прежде всего, подготовки обоснованных исходных данных. orsional vibrations of elastic-mass systems belong to those dangerous dynamic loads that can lead to emergency damage to shafts, elastic couplings and other elements of power plants with a diesel drive. These features prompted the authors to prepare reasonable initial data at the first stage of analytical and experimental studies of torsional vibrations of the universal diesel generator set DG-8.83. For this purpose, the moments of inertia and pliability of the elements of the torsion system are determined using known empirical formulas, the finite element method, and partially experimentally. Then, based on the analysis and generalization of the results obtained, a reasonable choice of moments of inertia and pliability was made as updated initial data. Based on the selected initial data, the authors intend to start calculating torsional vibrations with a rigid and elastic connection of a diesel engine with a generator. To ensure the accuracy of analytical and experimental studies of torsional vibrations of other diesel installations, the authors recommend, first, the preparation of reasonable initial data.

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Ioan, Stroe. "ELASTIC AND SAFETY CLUTCHES RUBBER INTERMEDIATE ELEMENTS IN THE FORM OF AXIALLY ARRANGED CYLINDRICAL ROLLERS." PARIPEX INDIAN JOURNAL OF RESEARCH, December 15, 2019, 1–3. http://dx.doi.org/10.36106/paripex/6507893.

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the paper presents the variant of an elastic and safety coupling that has intermediate elements in the form of cylindrical rolls of elastic elements with different elasticities and rigidities. The cylindrical rollers are arranged on both semicouplings the functional contact being realized on the generator realized between the two cylindrical rollers. The structure and the constructive form of the coupling are presented.Starting from the geometric model,the torque and the elastic characteristic of the coupling are determined. The elastic and safety coupling with intermediate elements of elastic rollers too the shocks and torsional vibrations of the mechanical transmission as well as the deviations of position and form respectively the mounting errors.The theoretical and experimental characteristics of the coupling made with elastic elements of different rigidity are determined.The final conclusions highlight the advantage of the new elastic and safety coupling that combines the simple functions of the mechanical couplings by successfully replacing the use of the combined couplings.

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Azuma, Seinosuke, Hideyuki Morita, Kazuo Hirota, Yoshiyuki Kondo, Seiho Utsumi, Yoshiteru Komuro, Ryoichi Kawakami, Toshifumi Nariai, and Yoshito Nishikawa. "Investigation of In-Plane Fluid Elastic Instability for a Triangular Tube Bundle Subjected to Two-Phase Flow." Journal of Pressure Vessel Technology 142, no. 2 (February 24, 2020). http://dx.doi.org/10.1115/1.4045992.

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Abstract In recent years, in a newly installed replacement steam generator, in-plane (IP) fluid elastic instability (FEI) for the heat transfer tubes has occurred. The fluid elastic instability is one of the severe vibrations in the heat transfer tube bundle and should be avoided. There have been many studies on the out-of-plane (OOP) fluid elastic instability, and the design evaluation guideline based on Connors' equation and the results of flow tests has been established. On the other hand, no evaluation guideline has been established for in-plane fluid elastic instability, and no critical coefficient has been determined in high-temperature, high-pressure steam–water two-phase conditions. Therefore, in this paper, in order to develop the guideline for evaluating in-plane fluid elastic instability, the critical coefficients were obtained using two types of test equipment for rotate triangular array in two-phase flow (SF6 ethanol) simulating steam–water flow under high-temperature and high-pressure conditions.

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Zhao, Wei, Rencheng Zheng, Xiangran Yin, Xilu Zhao, and Kimihiko Nakano. "An Electromagnetic Energy Harvester of Large-Scale Bistable Motion by Application of Stochastic Resonance." Journal of Vibration and Acoustics 144, no. 1 (June 11, 2021). http://dx.doi.org/10.1115/1.4051265.

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Abstract Vibrational energy harvesting has attracted considerable research attention for electrical power collection from ambient vibrations. Thereby, this study first developed an electromagnetic energy harvester of large-scale bistable motion by application of stochastic resonance, to enhance energy harvesting efficiency at a broadly low frequency. The electromagnetic energy harvester is fabricated by a magnet-coil generator and an oblique-supported spring-mass system. In the beginning, a weighting function is originally proposed considering mutual position relationship of the magnet and coil, and a motion equation and an electromagnetic induction equation are simultaneously established considering both elastic spring recovery force and electromagnetic induction Lorentz force. Subsequently, numerical analysis is processed to resolve the simultaneous equations to obtain systematic response displacement and the induced voltage, and the numerical solutions are accurately consistent with the measuring results in validation experiments. Furthermore, a damping coefficient is identified considering the mutual effectiveness of the damping forces from the normal friction and electromagnetic induction, and the influence of electromagnetic induction damping on systematic response displacement is carefully discussed. Eventually, experimental results clarified that the stochastic resonance phenomenon actually occurred as a large-scale bistable motion, and it is further validated that power generation efficiency can be noticeably enhanced following amplitude amplifications of systematic response displacement.

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Bernitsas, Michael M., Y. Ben-Simon, Kamaldev Raghavan, and E. M. H. Garcia. "The VIVACE Converter: Model Tests at High Damping and Reynolds Number Around 105." Journal of Offshore Mechanics and Arctic Engineering 131, no. 1 (December 11, 2008). http://dx.doi.org/10.1115/1.2979796.

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The vortex induced vibrations for aquatic clean energy (VIVACE) converter is a new concept to generate clean and renewable energy from fluid flows such as those abundant in oceans, rivers, or other water resources. The underlying concepts for design, scaling, and operation of VIVACE were introduced in Bernitsas et al., 2008, “VIVACE (Vortex Induced Vibration Aquatic Clean Energy): A New Concept in Generation of Clean and Renewable Energy From Fluid Flow,” ASME J. Offshore Mech. Arct. Eng., 130(4), p. 041101. In its simplest form, a VIVACE modulo consists of a single rigid cylinder mounted on elastic supports and connected to a power takeoff (PTO) system. The cylinder is placed in a steady unidirectional current and excited in vortex induced vibration (VIV). In this paper, the VIVACE modulo was tested in the Low Turbulence Free-Surface Water Channel of the University of Michigan to demonstrate the concept, generate electricity, measure the power out, and calculate basic benchmarking measures such as energy density. The tests performed were tailored to the particulars of the VIVACE modulo, which dictate that the cylinder operate in VIV under high damping and as high a Reynolds number as possible. At the same time, a broad range of synchronization is required to make VIVACE effective in energy generation in a realistic environment. Due to these requirements, VIV tests have not been performed before in the subspace applicable to the operation of the VIVACE modulo. In the process of extracting fluid kinetic energy and converting it to electricity in the laboratory, for a given set of cylinder-springs-transmission-generator, only the damping used for harnessing electricity was optimized. Even at this early stage of development, for the tested VIVACE modulo, the maximum peak power achieved was Ppeak=0.308×12ρDLL. The corresponding integrated power in that particular test was PVIVACE=0.22×12ρU3DL with theoretical upper limit based on measurements of PUL–VIVACE=0.3663. Such power was achieved at velocity U=0.840m∕s=1.63Kn.

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Journal articles on the topic 'Electrodisharge generator of elastic vibrations'

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