Relevant bibliographies by topics / Mechanical Vibration

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Mechanical Vibration'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 July 2024

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Journal articles on the topic "Mechanical Vibration"

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Ragaišis, L., R. Jonušas, K. Ragulskis, and V. Jurėnas. "Research of Possibilities of Energy Transformation Using an Autovibrating System, Excited by Small Outer Excitement." Solid State Phenomena 113 (June 2006): 207–12. http://dx.doi.org/10.4028/www.scientific.net/ssp.113.207.

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There are lots of sources of disturbance in people’s surrounding environment - e.g. wind, sea, river flow, and intensive acoustic noise. These sources can cause auto vibrations of particular dynamic systems. Such phenomenon could be used for converting mechanical vibration energy to electrical energy. Solving this problem is topical because it could help to create autonomic sources of renewable energy. Dynamic model, described by a presumptive differential motion equation, of auto vibrating system, affected by airflow is made and inspected. Possible modes of vibrations and different states of nonlinear auto vibrating system are analyzed using methods of Newmark and Runge-Kutta. Auto vibration existence zones of the system are designated. Reliance on the existence of poly-solutions, stability or chaotic solutions of vibrating system is estimated. Consistencies of using electro dynamical principle of converting mechanical vibration energy to electric energy are inspected.
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Гапонюк, Т. О., Р. В. Кірчук, and Л. Ю. Забродоцька. "USING HYDRAULIC PARAMETRIC VIBRATION EXCITER IN AGRICULTURAL ENGINEERING." СІЛЬСЬКОГОСПОДАРСЬКІ МАШИНИ, no. 48 (October 31, 2022): 7–14. http://dx.doi.org/10.36910/acm.vi48.778.

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Vibration technology is widely used in mechanical engineering, construction, road building and different sectors of the manufacturing. In agriculture, it is used for dosing feed, cleaning and sorting seeds, digging up root crops, planting potatoes, and transporting bulk materials. Vibrations make the mechanical system more stable in relation to external force disturbances and do not change the technological properties of materials during its movement along the working surfaces. Also, the material passing through the vibration zone is not damaged. A wide range of frequency and amplitude of vibrations provides the possibility of vibration regime varying, and the characteristics of the movement of agricultural plant material on the vibrating working bodies. The analysis of possibility of application of vibrating hydraulic drives as elements of transmission of movement to working bodies of agricultural machines is executed. A historical excursion was conducted and the first mentions of the use of hydraulic drives were pointed out. The estimation of technological processes in agricultural production where it is expedient and possible to use vibration and vibrating drives is made. At the present stage of development of agricultural engineering, using vibrating hydraulic drive is accorded to the basic trends of agriculture machinery development. The stand for conduction of studies of amplitude-frequency characteristics of the vibrating drive with regulated perturbations is offered. A mathematical model is presented, which generally describes the course of the vibration process and estimates the stiffness of the mechanical system. The hydraulic parametric vibration exciter is recommended to use for studying and determination the conditions for the occurrence of parametric vibrations in working body of agricultural machines. Also, using a hydraulic drive makes it possible to simplify the kinematics, reduce metal consumption, increase accuracy, reliability and level of automation of working bodies of agricultural machines.
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Zhang, Yinquan, Kun Huang, and Changxing Zhang. "Nonlinear Vibrations of Carbon Nanotubes with Thermal-Electro-Mechanical Coupling." Applied Sciences 13, no. 4 (February 4, 2023): 2031. http://dx.doi.org/10.3390/app13042031.

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Carbon nanotubes (CNTs) have wide-ranging applications due to their excellent mechanical and electrical properties. However, there is little research on the nonlinear mechanical properties of thermal-electro-mechanical coupling. In this paper, we study the nonlinear vibrations of CNTs by a thermal-electro-mechanical coupling beam theory. The Galerkin method is used to discretize the partial differential equation and obtain two nonlinear ordinary differential equations that describe the first- and second-order mode vibrations. Then, we obtain the approximate analytical solutions of the two equations for the primary resonance and the subharmonic resonance using the multi-scale method. The results indicate the following three points. Firstly, the temperature and electric fields have a significant influence on the first-mode vibration, while they have little influence on the second-mode vibration. Under the primary resonance, when the load amplitude of the second mode is 20 times that of the first mode, the maximal vibrational amplitude of the second is only one-fifth of the first. Under the subharmonic resonance, it is more difficult to excite the subharmonic vibration at the second-order mode than that of the first mode for the same parameters. Secondly, because the coefficient of electrical expansion (CEE) is much bigger than the coefficient of thermal expansion (CTE), CNTs are more sensitive to changes in the electric field than the temperature field. Finally, under the primary resonance, there are two bifurcation points in the frequency response curves and the load-amplitude curves. As a result, they will induce the jump phenomenon of vibrational amplitude. When the subharmonic vibration is excited, the free vibration term does not disappear, and the steady-state vibration includes two compositions.
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Coelho, Andre Luiz de Freitas, Fábio Lúcio Santos, Francisco de Assis de Carvalho Pinto, and Daniel Marçal de Queiroz. "Detachment efficiency of fruits from coffee plants subjected to mechanical vibrations." Pesquisa Agropecuária Tropical 45, no. 4 (December 2015): 406–12. http://dx.doi.org/10.1590/1983-40632015v4536227.

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ABSTRACT The development of efficient machines for the mechanical harvesting of coffee plants requires the use of appropriate vibrational parameters. Thus, in order to detach less unripe fruits and decrease reharvesting, branch breakage and defoliation, it is important to choose the appropriate frequency, amplitude and vibration time. This study aimed at analyzing the detachment efficiency of fruits from coffee plants according to vibrational parameters and ripening stage. Fruit bunches were sampled at the green and mature stages and subjected to vibration, using a system composed by a signal generator, an amplifier and an electromagnetic vibrating machine. Tests combined different frequencies (16.4 Hz, 20.3 Hz, 24 Hz, 25.6 Hz, 30.0 Hz and 33.0 Hz), amplitudes (5.0 mm, 7.0 mm and 9.0 mm) and vibration times (10.0 s and 20.0 s). The vibration times did not affect the detachment efficiency. There was a trend for higher detachment efficiency in mature fruits than in green fruits. The detachment efficiency increased with increasing vibration frequency and amplitude.
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Beltran-Carbajal, Francisco, Hugo Francisco Abundis-Fong, Luis Gerardo Trujillo-Franco, Hugo Yañez-Badillo, Antonio Favela-Contreras, and Eduardo Campos-Mercado. "Online Frequency Estimation on a Building-like Structure Using a Nonlinear Flexible Dynamic Vibration Absorber." Mathematics 10, no. 5 (February 24, 2022): 708. http://dx.doi.org/10.3390/math10050708.

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The online frequency estimation of forced harmonic vibrations on a building-like structure, using a nonlinear flexible vibration absorber in a cantilever beam configuration, is addressed in this article. Algebraic formulae to compute online the harmonic excitation frequency on the nonlinear vibrating mechanical system using solely available measurement signals of position, velocity, or acceleration are presented. Fast algebraic frequency estimation can, thus, be implemented to tune online a semi-active dynamic vibration absorber to obtain a high attenuation level of undesirable vibrations affecting the main mechanical system. A semi-active vibration absorber can be tuned for application where variations of the excitation frequency can be expected. Adaptive vibration absorption for forced harmonic vibration suppression for operational scenarios with variable excitation frequency can be then performed. Analytical, numerical, and experimental results to demonstrate the effectiveness and efficiency of the operating frequency estimation, as well as the acceptable attenuation level achieved by the tunable flexible vibration absorber, are presented. The algebraic parametric estimation approach can be extended to add capabilities of variable frequency vibration suppression for several configurations of dynamic vibration absorbers.
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Shpachuk, V. P., M. A. Zasiadko, T. O. Suprun, and V. V. Dudko. "Variation coefficient of torsional vibrations of the connection nodes of vibrating machines." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (2021): 85–89. http://dx.doi.org/10.33271/nvngu/2021-6/085.

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Purpose. To formalize the dependence of the eigenfrequencies of translational and torsional vibrations of the structural elements of the vibrating machine articulated by the connection node on their design parameters and mechanical characteristics, as well as regulatory requirements for vibration activity, strength and accuracy. To develop a method for selecting the design parameters of the elastic band element of the package, taking into account the specified values of the amplitude and frequency characteristics of the dynamic loads reproduced by the supporting structure and the coefficient of variation of the natural frequencies of translational and torsional vibrations. Methodology. The research is based on fundamental approaches of applied mechanics, machine dynamics and vibration reliability. Findings. The dependences of the eigenfrequencies of torsional vibrations of the body parts of the vibrating machine connected by the connection node on their design parameters and mechanical characteristics are obtained and analyzed. Vibrations around an axis orthogonal to the working direction of the node are considered. A comparative analysis of the natural frequencies of the node in the direction of the transmitted vibration and its circular vibrations from the design parameters and mechanical characteristics of the elastic band elements, their number in the package and the number of packages in the connection node is performed. Originality. It is in the fact that for the first time the dependences describing the natural frequencies of translational and torsional vibrations of the body parts of a vibrating machine, articulated by a package of elastic band elements, are obtained. Also the paradigm for the choice of design parameters and mechanical characteristics of the elastic band element of the package, which is based on the results of a comparative analysis of the eigenfrequencies of vibrations in the working and connected directions through their coefficient of variation is innovative. This made it possible to include the criterion of vibration reproduction accuracy, which is formalized through the coefficient of frequency variation, together with the criteria of strength and rigidity, in the methodology of synthesis of the structural scheme of the vibrating machine. Practical value. The proposed methodological solutions for the calculation and selection of design parameters and mechanical characteristics of tape elastic elements ensure the achievement of vibration activity indicators of articulated parts, as well as the ratio of natural vibration frequencies in the working and related directions at the level of the requirements of normative documents when upgrading existing machines and creating new modern equipment. As a result, the reliability, durability, safety, productivity and load-bearing capacity of machines, equipment and mechanisms of mining engineering, aviation, transport and space technology are increased.
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Stosiak, Michał, Paulius Skačkauskas, and Adam Deptuła. "THE IMPACT OF MECHANICAL VIBRATIONS ON HYDRAULIC VALVES AND THE POSSIBILITY OF REDUCING THE EFFECTS." Aviation 28, no. 1 (March 28, 2024): 40–48. http://dx.doi.org/10.3846/aviation.2024.20904.

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The paper shows that mechanical vibrations occur in a wide frequency range in the hydraulic systems operating in the real world. Hydraulic valves are also exposed to these vibrations. The paper gives examples of vibration sources and suggests that the influence of vibrations on hydraulic valves could be reduced. Particular attention was paid to the vibrating proportional distributor. The amplitude-frequency spectrum of pressure pulsation in a hydraulic system with a vibrating proportional distributor was analysed. During the tests, the frequency of external mechanical vibrations acting on the proportional distributor and their direction was changed.
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Gunawan, Gani. "Penyelesaian khusus persamaan diferensial biasa ordo dua linier tak homogen dengan koefisien konstan untuk fungsi bagian demi bagian." Majalah Ilmiah Matematika dan Statistika 24, no. 1 (March 14, 2024): 1. http://dx.doi.org/10.19184/mims.v24i1.38240.

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Spring mechanical vibration motion system with a damped degree of freedom and influenced by external forces, is mathematically expressed as an ordinary differential equation of order of two linear constant coefficients that are not homogeneous. If an external force acts on a stationary system expressed as a continuous function f(t) for any time t, then the system will experience mechanical vibrational motion which mathematically the equation of motion can be expressed as a superposition. The equation consists of as a solution to a homogeneous form with mechanical vibrations as a solution to a particular form. In terms of the particular solution this article will show a mathematical way when f(t) is a continuous function section by part which is defined at an interval, such that the mechanical vibration motion equation is at the same time a special solution of the equation the mechanical vibration system. Keywords: Vibration, Impulse Functions, ConvolutionMSC2020: 34A37
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Wang, Liping, Hung-Yao Hsu, Xu Li, and Cory J. Xian. "Effects of Frequency and Acceleration Amplitude on Osteoblast Mechanical Vibration Responses: A Finite Element Study." BioMed Research International 2016 (2016): 1–16. http://dx.doi.org/10.1155/2016/2735091.

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Bone cells are deformed according to mechanical stimulation they receive and their mechanical characteristics. However, how osteoblasts are affected by mechanical vibration frequency and acceleration amplitude remains unclear. By developing 3D osteoblast finite element (FE) models, this study investigated the effect of cell shapes on vibration characteristics and effect of acceleration (vibration intensity) on vibrational responses of cultured osteoblasts. Firstly, the developed FE models predicted natural frequencies of osteoblasts within 6.85–48.69 Hz. Then, three different levels of acceleration of base excitation were selected (0.5, 1, and 2 g) to simulate vibrational responses, and acceleration of base excitation was found to have no influence on natural frequencies of osteoblasts. However, vibration response values of displacement, stress, and strain increased with the increase of acceleration. Finally, stress and stress distributions of osteoblast models under 0.5 g acceleration inZ-direction were investigated further. It was revealed that resonance frequencies can be a monotonic function of cell height or bottom area when cell volumes and material properties were assumed as constants. These findings will be useful in understanding how forces are transferred and influence osteoblast mechanical responses during vibrations and in providing guidance for cell culture and external vibration loading in experimental and clinical osteogenesis studies.
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Trtík, Tomáš, Roman Chylík, Josef Fládr, and Jitka Vašková. "The Analysis of the Intensity and Vibration Time on the Mechanical Properties of Hardened Concrete." Solid State Phenomena 322 (August 9, 2021): 28–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.322.28.

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In order to achieve optimal physical and mechanical properties of hardened concrete, it is necessary to determine the right intensity and vibration time of fresh concrete during casting. Since concrete is considered as a polydisperse substance and various aggregate grains move randomly during vibration, it is very difficult to describe this stochastic phenomenon using exact physical equations and it is more advantageous to apply an experimental approach to verify the effects of vibration on fresh concrete. The effect of vibrations on fresh concrete increases the speed gradient of individual grains and thus reduces the viscosity of the cement paste. The intensity of vibration is determined mainly by the frequency, amplitude and centrifugal force of the eccentric of the vibrating machine. The optimal vibration time is generally considered to be the "minimum required". Insufficient vibration caused by an unsuitable vibrating machine or a short vibration time can result in insufficient compaction of the aggregate grains, non-release of accumulated air from the fresh concrete mixture, formation of cavities or poor-quality casting of parts of the structure with a higher degree of reinforcement. Vibration with excessive intensity or time can also be considered dangerous. The over-compaction of concrete is most often demonstrated by segregation of aggregates. The presented research deals with the determination of the optimal time and intensity of vibration of fresh concrete mixture to achieve the required physical properties of concrete, i.e. high compressive strength and modulus of elasticity of hardened concrete while reducing the negative effects of vibration, especially segregation of aggregates.
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Dissertations / Theses on the topic "Mechanical Vibration"

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Trimble, A. Zachary. "Downhole vibration sensing by vibration energy harvesting." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39891.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
Includes bibliographical references (p. 117).
This thesis outlines the design of a prototype electromagnetic induction vibration energy harvesting device for use in a downhole environment. First order models of the necessary components for a generic vibration energy harvester are presented and used to predict the most sensitive parameters for the design of energy harvesting systems. A subset of the design tools created in MATLAB and Excel for vibration energy harvester design and first order optimization is introduced and used to aid in the design of an energy harvester specific to the downhole environment. The manufacture of a prototype design is documented and recommendations for future manufacturing processes are given. The prototype is then tested against the models. Based on the results, final conclusions and recommendations for future refinements are made, and other applications are suggested.
by A. Zachary Trimble.
S.M.
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Donarski, Robert J. "Bone fracture measurement using mechanical vibration." Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256998.

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LIMA, ROBERTA DE QUEIROZ. "RAMDOM VIBRATION ANALYSIS OF MECHANICAL SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19543@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
A parte inicial da dissertação apresenta uma discussão sobre o método de Monte Carlo e sobre geradores de realizações de variáveis aleatórias e vetores aleatórios. São analisados geradores baseados em: congruência linear, Método da Transformada Inversa e algoritmo de Metrópolis-Hastings (método de Monte Carlo com Cadeia de Markov MCMC). Posteriormente, são apresentadas técnicas para a análise de vibrações estocásticas em sistemas mecânicos com grau de liberdade, múltiplos graus de liberdade e contínuos. As propriedades dos sistemas são consideradas determinísticas e as forças são caracterizadas por processos estocásticos. Ao longo das seções do trabalho, é mostrado como características da resposta do sistema em deslocamento (média, autocorrelação e densidade espectral) podem ser obtidas a partir das informações sobre o forçamento. A transformada de Fourier, a função densidade eséctral e a função de transferência são importantes ferramentas utilizadas no estudo. No caso de sistemas com múltiplos graus de liberdade, análise é feita por dois métodos: Resposta ao Impulso e Modos Normais. Nos sistemas contínuos, análise é feita através do Método de Monte Carlo. Para isso, foi desenvolvido um exemplo de um sistema mecânico contínuo submetido a dois carregamentos caracterizados por processos estocásticos. Nesse exemplo, o MCMC foi utilizado para gerar amostras dos forçamentos. Em cada realização, o sistema foi discretizado através do Método dos Elementos Finitos e uma aproximação para solução do problema foi obtida utilizando o Método de Galerkin. Nessa parte da dissertação são apresentados a formulação fraca de equação de movimento da viga e o modelo reduzido. Ao longo de todo o trabalho são mostrados exemplos e resultados obtidos através de rotinas desenvolvidas em MATLAB.
The initial of work presents a discussion about the Monte Carlo Method and about the generation of samples of random variables and ran dom vectors. Generators based on linear congruential, on the Inverse Trans form Method and, on Metropolis-Hastings algorithm (Markov Chain Monte Carlo Method MCMC) are analyzed. Later,techniques for vibrations ana lysis of single-degree of freedom, multi-degree of freedom and continuous stochastic mechanical systems are presented. The system properties are con sidered dertministic and, the forces are characterized by random process. Throughout the work sections, it is show how the system´s displacement response (mean, autocorrrelation and spectral density) can be characterized from the force informations. The Fourier transform, the spectral density function and transfer function are powerful tools used in the study. In the case of multi-degree of freedom systems, the analysis is done by two methods: Impukse Response and Normal modes. For continuous systems, it is made by Monte Carlo method. An example of one continuous mechanical system with two random loads were developed. In this example, MCMC is used to generate samples of the forces. For each realization, the problem is discretized by the Finite Element Method and one approximation of the solution is obtained by the Galerkin Method. In this part of the work, the weak formulation of the motion equation of the vibrating beam and the reduced model are presented. Throughout the work many rountines in MATLAB were developed.
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Petri, Patrick Andreas 1979. "Vibration-induced rotation." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/36110.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
This thesis presents, explores, and documents the validation of a mechanical mechanism dubbed Vibration-Induced Rotation, or VIR. The tendency of threaded fasteners to move under the influence of vibrations is well known, but never before has the root cause been identified and investigated in search of beneficial consequences. The sense of rotation, speed, and force with which a threaded body moves in an appropriately vibrated medium is a function of the excitation. The principal kinematic and dynamic relationships governing VIR have been developed and experimentally affirmed. There is evidence for more complex modes of motion, but pure VIR remains the dominant response under a wide variety of conditions. Simplicity, robustness, and uniqueness suggest a multitude of possible applications, particularly in the areas of product assembly and fastener insertion. This thesis should provide a cornerstone in a new and promising field of application-oriented research.
by Patrick Andreas Petri.
S.B.
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Nauclér, Peter. "Modeling and control of vibration in mechanical structures /." Uppsala : Univ. : Dept. of Information Technology, Univ, 2005. http://www.it.uu.se/research/publications/lic/2005-005/.

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Kitazaki, Satoshi. "Modelling mechanical responses to human whole-body vibration." Thesis, University of Southampton, 1994. https://eprints.soton.ac.uk/173255/.

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Nauclér, Peter. "Modeling and control of vibration in mechanical structures." Licentiate thesis, Uppsala universitet, Avdelningen för systemteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-85824.

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All mechanical systems exhibit vibrational response when exposed to external disturbances. In many engineering applications vibrations are undesirable and may even have harmful effects. Therefore, control of mechanical vibration is an important topic and extensive research has been going on in the field over the years. In active control of vibration, the ability to actuate the system in a controlled manner is incorporated into the structure. Sensors are used to measure the vibrations and secondary inputs to the system are used to actuate the flexible body in order to obtain some desired structural response. In this thesis, feedback and feedforward control of active structures are addressed. The thesis is divided into four parts. The first part contains a general introduction to the subject of active vibration control and also provides an outline of the thesis. The second part of the thesis treats modeling and feedback control of a beam system with strain sensors and piezoelectric actuators. Physical modeling and system identification techniques are utilized in order to obtain a low order parametric model that is suitable for controller design. The third part introduces the concept of a mechanical wave diode, which is based on feedforward control. A controller is derived on the basis of equations that describe elastic waves in bars. The obtained controller is shown to have poor noise properties and is therefore modified and further analyzed. The final part of the thesis treats the same type of wave diode system as part three, but with more general feedforward filters. Especially, a controller based on Wiener filter theory is derived and shown to drastically improve the performance of the mechanical wave diode.
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Niknam, Alborz. "VIBRATION INSTABILITY IN FRICTIONALLY DRIVEN ELASTIC MECHANICAL SYSTEM." OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1579.

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Numerous mechanical systems contain surfaces in partial or full sliding contact, and therefore, prone to friction-induced vibration instability. These include systems containing mechanical switches, brakes, clutches, gears, rolling contact bearings, journal bearings, robot end-effector grasp and motion, oil drills, etc. The prominent dynamic features of a mechanical system, subject to friction-induced vibration, can be captured by an appropriate equivalent mass-on-belt model. It is the goal of this research to provide a comprehensive study of friction-induced vibrations in mechanical systems by using their equivalent mass-on-belt models. Friction-induced vibration is manifested through three mechanisms termed Stribeck effect, mode-coupling and sprag-slip. Mechanical systems prone to vibrations by one or more of the three mechanisms of instability are considered and studied in detail. The mechanical systems fall into one of two groups. A system in the first group is the pseudo-rigid-body mass-on-belt representation of a compliant bistable linkage mechanism characterized by substantial geometric nonlinearity and nonlinear elasticity. A system in the second group is a mass-on-belt model that accounts for mass-belt contact stiffness. Such a system is excited primarily through mode coupling. In the first group of mechanical systems super and subcritical pitchfork bifurcation as well as Hopf bifurcation are observed. The normal force and spring pre-compression are bifurcation parameters leading to the subcritical pitchfork bifurcation and the belt velocity corresponds to the Hopf bifurcation. It is found that for a low damping and negligible spring nonlinearity, one equilibrium point dominates the steady-state response. Otherwise, the phase plane is split into two separate planes associated with the corresponding fixed point. The boundary is dictated by structural damping and spring nonlinearity. It is shown that the destabilizing mechanism in the bistable mechanisms is the Stribeck effect of friction. The dominant mode of instability for the second group of mechanical system is mode coupling instability. In this group intermittent loss of contact between the mass and the moving belt within a periodic cycle is allowed. Addition of a vibration absorber consisting of a second mass suspended from the first mass by a spring provides effective passive control of friction-induced instability due to mode-coupling. The research concludes with the study of a two mass system in which both masses are in contact with a belt and the friction force is characterized by the three regimes of lubricated contact that include boundary lubrication, mixed boundary and hydrodynamic lubrication and full hydrodynamic lubrication as sliding speed is increased. It is shown that such systems can experience periodic, quasi-periodic and chaotic vibration response.
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Baker, R. T. "Vibration in electromagnetically heated steel." Thesis, Aston University, 1995. http://publications.aston.ac.uk/15272/.

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When a ferromagnetic steel billet was heated by induction a large increase in the amplitude of longitudinal vibration frequently occurred as a result of resonance. This happened when a natural frequency of the bar coincided with twice the heating frequency or multiples thereof. The temperature at which resonance occurred depended on a number of factors including billet length and heating power. Resonance was most often observed when the surface temperature of the billet reached the Curie point. It is well established that magnetostrictive vibrations occur in a ferromagnetic material subjected to an alternating electromagnetic field, but existing data suggests that linear magnetostriction decreases towards the Curie point. Linear magnetostriction was measured in a sample of mild steel up to 800oC using a high temperature strain gauge. The magnetostriction constant 100 was calculated assuming an average grain orientation in mild steel. The data was found to be comparable to that published for single crystals of iron. It was discovered that linear magnetostriction was responsible for resonance below 600oC but not for temperatures near the Curie point. Other possible causes of resonance such as forces produced by the interaction between eddy currents and the alternating electromagnetic field, the alpha to gamma phase transformation and the existence of a thin ferromagnetic layer were investigated. None were found to account for resonance in bars of mild steel heated by induction. Experimental work relating to the induction heating of steel is compared to previous work on the subject of electromagnetic generation of ultrasound where a similar increase of the amplitude of longitudinal waves in steel is reported at the Curie point. It is concluded that the two phenomena are related as they show strong similarities.
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McCarthy, Daniel Joseph. "Vibration-based diagnostics of reciprocating machinery." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/10823.

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Books on the topic "Mechanical Vibration"

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Kelly, Samuel Graham. Mechanical vibrations: Theory and applications, SI. [Stamford]: Cengage Learning, 2012.

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Mechanical vibration & shock. New York, NY: Taylor & Francis, 2002.

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Kelly, S. Graham. Fundamentals of mechanical vibrations. New York: McGraw-Hill, 1993.

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Fundamentals of mechanical vibrations. New York: McGraw-Hill, 1993.

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Fundamentals of mechanical vibrations. 2nd ed. Boston, Mass: McGraw-Hill, 2000.

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Fundamentals of mechanical vibrations. New York: McGraw-Hill, 1993.

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Mechanical vibrations. 5th ed. Upper Saddle River, N.J: Prentice Hall, 2010.

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Mechanical vibrations. 4th ed. Upper Saddle River, N.J: Pearson Prentice Hall, 2004.

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Mechanical vibrations. Singapore: Pearson/Prentice Hall, 2005.

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Mechanical vibrations. New York: Dover Publications, 1985.

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Book chapters on the topic "Mechanical Vibration"

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Hagedorn, P. "Mechanical Vibrations and Vibration Control." In Passive and Active Structural Vibration Control in Civil Engineering, 1–78. Vienna: Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-3012-4_1.

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Gans, Roger F. "Vibration Measurement." In Mechanical Systems, 173–99. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08371-1_5.

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Shabana, A. A. "Forced Vibration." In Mechanical Engineering Series, 135–84. New York, NY: Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4612-3976-5_4.

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Shabana, A. A. "Forced Vibration." In Mechanical Engineering Series, 125–76. New York, NY: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-0362-6_4.

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Shabana, Ahmed A. "Free Vibration." In Mechanical Engineering Series, 69–128. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94271-1_3.

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Shabana, Ahmed A. "Forced Vibration." In Mechanical Engineering Series, 129–76. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-94271-1_4.

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Feng, Wenzong, Qing Zhang, Zhuoxiang Chen, Jianqun Zhang, and Haoyu Wang. "Dynamical Simulation Analysis of Faulty Gearbox in Quay Crane Under Dynamic Load." In Lecture Notes in Mechanical Engineering, 187–99. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_15.

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AbstractDynamics simulations with faults can elucidate fault vibration characteristics, yet the vibrational properties of the quay crane lifting gearboxes under dynamic load excitation remain unclear. Based on multi-body dynamics theory, a multi-body dynamical model of the quay crane gearbox is established, simulating dynamic load excitation caused by cables and containers during the operation of a quay crane. The vibration responses under various working conditions and load types of different gear states are analyzed, and the corresponding fault frequency features are extracted by envelope spectrum. Simulations indicate that local gear faults enlarge the amplitude of gearbox vibrations, inducing the phenomenon of gear mesh frequency and its harmonics modulated by gear fault frequency. Based on these studies, a testbed for the quay crane gearbox is constructed. The experiment verifies the accuracy of the dynamic model and reveals that the simulation signal of load-as-dynamic-load is more consistent with reality than static load. The results provide a basis for fault diagnosis of quay crane lifting gearboxes under dynamic load, and can offer simulation data support for intelligent diagnosis models lacking fault samples.
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Ju, Shu, Max Reitenspieß, Kai Zhang, and Nico Hanenkamp. "Model-Based Correlation Analysis of Machine Control Parameters and Process Vibration Amplitudes by the Example of Milling." In Lecture Notes in Mechanical Engineering, 12–20. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28839-5_2.

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AbstractIn machining processes, system-immanent process vibrations lead not only to lower surface quality of workpieces but also to the degradation of the machine and tool wear. Effectively minimizing process vibration amplitudes without costly software or hardware add-ons is a research topic that demands further investigation. In this regard, this article focuses on the further development of a holistic milling process model as well as the experimental and simulation-based vibration analysis. The interaction between the nonlinear behaviors of the cascade controlled electric motors and the process parameters are practically evaluated. Moreover, based on the experimental and simulation results, a correlation analysis of the machine control parameters and the process vibration amplitude has been implemented.
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Morello, Lorenzo, Lorenzo Rosti Rossini, Giuseppe Pia, and Andrea Tonoli. "Noise, Vibration, Harshness." In Mechanical Engineering Series, 239–363. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0516-6_5.

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Rao, Singiresu S. "Vibration and Shock." In Mechanical Engineers' Handbook, 1204–29. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0471777447.ch34.

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Conference papers on the topic "Mechanical Vibration"

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Choura, Slim A. "Vibration Confinement in a Flexible Truss-Structure." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0907.

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Abstract In this paper, the vibration of a flexible truss-structure, described as a finite element model, is confined and suppressed simultaneously using feedback. The structure is assumed to possess regions that are sensitive to vibrations. The control objective is concerned with the isolation of the sensitive regions from vibrational amplitudes. This necessitates the employment of point force actuators for altering the eigenvalues and mode shapes of the structure. The modified eigenstructure of the system allows the confinement of vibration away from the sensitive regions. In order to avoid build-up of vibrational amplitudes during the confinement process, the proposed feedback contains a mechanism for vibration suppression. In addition, the proposed control strategy demonstrates that the vibrational amplitudes associated with the sensitive regions are brought faster to rest as opposed to those associated with the remaining regions of the structure. We show that the confinement-suppression of structural vibration is possible with a reduced amount of actuators whose number is less or equal to the dimension of the structure model.
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Bin Tahir, Ammaar, Oleg Shiryayev, Hamad Karki, and Nader Vahdati. "Nonlinear Vibration Absorber for Mitigation of Torsional Vibrations." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86715.

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This work discusses the effects of utilizing a nonlinear energy absorber with linear and cubic stiffness characteristic in mitigating torsional vibrations in a 5 degrees-of-freedom (5-DOF) rotational system. Results comparing the effects of adding a linear TMD in the system with those obtained by adding an NES are presented which demonstrate the usefulness of an NES over a conventional TMD. Subsequently, a simpler translational system comprising of an NES is considered and an optimization-based tuning methodology is used in order to tune the NES for maximum dissipation of vibration energy. The results are compared with those obtained for the system with a linear absorber.
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Saha, Pranab. "Mechanical Impedance Based Vibration Damping Test." In Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2017. http://dx.doi.org/10.4271/2017-01-1879.

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Guran, Ardeshir, and Iradj G. Tadjbakhsh. "Mechanical actuator to suppress vibration." In 1993 North American Conference on Smart Structures and Materials, edited by Nesbitt W. Hagood and Gareth J. Knowles. SPIE, 1993. http://dx.doi.org/10.1117/12.152752.

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Ghemari, Zine, and Abdelaziz Lakehal. "Vibration sensor mechanical sensitivity improvement." In 2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM). IEEE, 2014. http://dx.doi.org/10.1109/cistem.2014.7076933.

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Ferreira, Sofia, Stanimir Valtchev, Fernando Coito, and Mikhail Mudrov. "Mechanical vibration using piezoelectric material." In 2017 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM) & 2017 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP). IEEE, 2017. http://dx.doi.org/10.1109/optim.2017.7975047.

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Renner Guilherme da Costa Marques, Hans Ingo Weber, and Leonardo Ishimoto. "Radial Subsynchronous Vibration (SSV) induced by Axial Vibration." In 23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro, Brazil: ABCM Brazilian Society of Mechanical Sciences and Engineering, 2015. http://dx.doi.org/10.20906/cps/cob-2015-0500.

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Duan, Shanzhong (Shawn), Lars Mattison, and Teresa Binkley. "Multibody Dynamics Model for Analysis of Human Body Response to Vibrations." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86880.

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Some laboratory studies have showed that vibrational stimulation can enhance muscle strength and improve bone density, but it is not clearly understood how frequency and magnitude of vibration have effects on human muscles and bones. In this paper, a whole-body vibration case study is presented to help understand mechanism of human body responses to vibration intervention. A whole body vibration platform is used to provide a source of vibrational intervention. A person steps up and stands on the platform to experience whole-body vibration. Based on this whole-body vibration intervention case, a multibody biomechanical model is created to represent the human body and the WBV platform, and a sinusoidal force function is used to stand for vibrational input from the platform. Kane’s methods are used to derive equations of motion of this multibody biomechanical system. The model will be used to carry out computer simulation and to analyze how human body response to vibrations.
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Watanabe, Aya, Ryousuke Yuyama, Hiroshi Hosaka, and Akira Yamashita. "Fundamental Study on Friction-Driven Gyroscopic Power Generator Works Under Arbitrary Vibration." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10474.

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Abstract This paper describes a friction-driven gyro generator that works under arbitrary vibrations and generates more than 1 W of power. Vibrational generators are energy harvesters that convert environmental vibrations into electrical power via the inertial force of pendulums. In conventional generators that use simple vibration, the power is less than 10 mW for a wearable size because vibrations in the natural environment are as low as 1 Hz. Gyroscopic generators increase the inertial force by rotating a pendulum at high speed and creating a gyro effect. In this generator, a palm-size product that generates 0.1 W and weighs 280 g has already been commercialized, but this device operates only under a particular vibration that synchronizes rotor precession and stalls under random vibration. To solve this problem, in this research, two gimbals and a precession spring are introduced to support the rotor. We developed a prototype generator with straight tracks measuring 16 cm × 11 cm × 12 cm with a mass of 980 g. Under a vibration of 4 Hz and ±20 degrees, power generation of 1.6 W was confirmed. Next, a prototype circular track was made. Power generation of 0.2 W with a vibration of 1 Hz and ±90 degrees was confirmed. Finally, a simple formula to estimate the upper limit of the generation power is derived. It is suggested that the circular-type generator is suitable for low-frequency vibration and can generate twice the power of a straight-type generator.
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Gaul, Lothar, and 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.
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Reports on the topic "Mechanical Vibration"

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ACOUSTICAL SOCIETY OF AMERICA NEW YORK. Minutes - Accredited Standards Committee on Mechanical Shock and Vibration, S2. U.S. Tag for ISO/TC108 Mechanical Vibration and Shock. Fort Belvoir, VA: Defense Technical Information Center, August 1991. http://dx.doi.org/10.21236/ada239612.

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ACOUSTICAL SOCIETY OF AMERICA NEW YORK. Minutes: Accredited Standards Committee on Mechanical Vibration and Shock, S2. U.S. Tag for ISO/TC 108 Mechanical Vibration and Shock. Fort Belvoir, VA: Defense Technical Information Center, October 1993. http://dx.doi.org/10.21236/ada275591.

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ACOUSTICAL SOCIETY OF AMERICA NEW YORK. U.S. TAG for ISO/TC108 Mechanical Vibration and Shock (Minutes of the Accredited Standards Committee on Mechanical Shock and Vibration, S2). Fort Belvoir, VA: Defense Technical Information Center, May 1991. http://dx.doi.org/10.21236/ada239536.

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Villegas Aguilar, Julio Cesar, Marco Felipe Salas Orozco, Maria de los Angeles Moyaho Bernal, Eric Reyes Cervantes, Julia Flores-Tochihuitl, Alberto Vinicio Jerezano Domínguez, and Miguel Angel Casillas Santana. Mechanical vibrations and increased alveolar bone density in animal models as an alternative to improve bone quality during orthodontic treatment: A systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, August 2022. http://dx.doi.org/10.37766/inplasy2022.8.0103.

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Review question / Objective: The aim of this systematic review is to determine whether mechanical vibration increases alveolar bone density in animals models and their possible application during orthodontic treatment. In this sense, the focused question is: Is the increase in alveolar bone density by mechanical vibrations in animal models an alternative to improve bone quality during orthodontic treatment? Eligibility criteria: All published animal studies will be included. Animal studies where high or low frequency vibrations were be applied, Articles where density or osteogenesis were be measured and compared to a control group. All publications will be considered except for those where the full-text article will not available, or the authors’ affiliation or the place of publication will not be specified. Only articles published in English.
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ACOUSTICAL SOCIETY OF AMERICA NEW YORK. U.S. Tag for ISO/TC 108 Mechanical Vibration and Shock. Minutes of the Accredited Standards Committee on Mechanical Vibration and Shock, S2. Fort Belvoir, VA: Defense Technical Information Center, May 1993. http://dx.doi.org/10.21236/ada273015.

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Robinson, D. C. A description of NBS calibration services in mechanical vibration and shock. Gaithersburg, MD: National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.tn.1232.

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Smalley, A. J., and P. J. Pantermuehl. TR-97-2 Foundation Guidelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), January 1997. http://dx.doi.org/10.55274/r0011730.

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These guidelines provide guidance to engineers responsible for installing or repamng the foundations of reciprocating compressors. If followed, the guidance should help assure an installation with a long life of trouble-free service. They address, in particular, mechanical integrity of the compressor/foundation installation, with emphasis on design of mounts, anchor bolts, and foundation block to carry the required dynamic loads. They defer to existing texts on vibration engineering for foundation blocks on their soil.
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Doebling, S. W., C. R. Farrar, M. B. Prime, and D. W. Shevitz. Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review. Office of Scientific and Technical Information (OSTI), May 1996. http://dx.doi.org/10.2172/249299.

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Wilcox and White. PO-316-10207-R01 Design Guideline for Small Diameter Branch Connections. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2011. http://dx.doi.org/10.55274/r0010738.

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In all industrial applications, vibration of piping components is a concern that is often addressed during the piping design phase. Effort is made to predict and avoid the mechanical natural frequency of large piping in order to prevent fatigue failures. However, small diameter branch connections are often overlooked. These connections are just as susceptible to fatigue failures due to high vibration as large piping is; therefore, the design of the small piping must also be considered. Current piping standards only place high level requirements on the design of small diameter branch connections and do not provide many recommendations related to the design of the connections. This guideline was developed in order to reduce the effort required to properly design small diameter branch connections. The guideline provides recommendations on the weight placed on the branch and the length of the connection in order to minimize the possibility of fatigue failure. The geometries provided in the guideline were based on natural frequency avoidance and consider the machine the branch is operating near, where the branch is placed in reference to the machine, frequency of excitation (operating speed of machine), and the geometry of the branch. The guideline does not attempt to predict actual vibration amplitudes on the branches. This guideline can be applied for any branch connection that has a nominal diameter less than two inches and a branch pipe to main pipe ratio of less than 25%.
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ACOUSTICAL SOCIETY OF AMERICA NEW YORK. U.S. TAG for ISO/TC43, Acoustics, IEC/TC29 Electroacoustics, and ISO/TC108/SC4 Human Exposure to Mechanical Vibration and Shock (Minutes of the Accredited Standards Committee on Bioacoustics, S3). Fort Belvoir, VA: Defense Technical Information Center, November 1990. http://dx.doi.org/10.21236/ada239538.

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