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Vibration control engineering : passive and feedback systems
\"This book applies vibration engineering to turbomachinery, covering installation, maintenance and operation. With a practical approach based on clear theoretical principles and formulas, the book is an essential how-to guide for all professional engineers dealing with vibration issues within turbomachinery. Vibration problems in turbines, large fans, blowers, and other rotating machines are common issues within turbomachinery. Applicable to industries such as oil and gas mining, cement, pharmaceutical and naval engineering, the ability to predict vibration based on frequency spectrum patterns is essential for many professional engineers. In this book, the theory behind vibration is clearly detailed, providing an easy to follow methodology through which to calculate vibration propagation. Describing lateral and torsional vibration and how this impacts turbine shaft integrity, the book uses mechanics of materials theory and formulas alongside the matrix method to provide clear solutions to vibration problems. Additionally, it describes how to carry out a risk assessment of vibration fatigue. Other topics covered include vibration control techniques, the design of passive and active absorbers and rigid, non-rigid and Z foundations. The book will be of interest to professionals working with turbomachinery, naval engineering corps and those working on ISO standards 10816 and 13374. It will also aid mechanical engineering students working on vibration and machine design.\"--Back cover.
Book
Vibration-based condition monitoring : industrial, aerospace and automotive applications
\"Without doubt the best modern and up-to-date text on the topic, wirtten by one of the world leading experts in the field. Should be on the desk of any practitioner or researcher involved in the field of Machine Condition Monitoring\" Simon Braun, Israel Institute of Technology Explaining complex ideas in an easy to understand way, Vibration-based Condition Monitoring provides a comprehensive survey of the application of vibration analysis to the condition monitoring of machines. Reflecting the natural progression of these systems by presenting the fundamental material and then moving onto detection, diagnosis and prognosis, Randall presents classic and state-of-the-art research results that cover vibration signals from rotating and reciprocating machines; basic signal processing techniques; fault detection; diagnostic techniques, and prognostics. Developed out of notes for a course in machine condition monitoring given by Robert Bond Randall over ten years at the University of New South Wales, Vibration-based Condition Monitoring: Industrial, Aerospace and Automotive Applications is essential reading for graduate and postgraduate students/ researchers in machine condition monitoring and diagnostics as well as condition monitoring practitioners and machine manufacturers who want to include a machine monitoring service with their product. Includes a number of exercises for each chapter, many based on Matlab, to illustrate basic points as well as to facilitate the use of the book as a textbook for courses in the topic. Accompanied by a website www.wiley.com/go/randall housing exercises along with data sets and implementation code in Matlab for some of the methods as well as other pedagogical aids. Authored by an internationally recognised authority in the area of condition monitoring.
eBook
Vibrations make sound
Young readers will learn how vibrations make sound and why we can hear it in this photo-filled book. Simple text and photos bring basic science concepts to life and encourage kids to engage with the sounds they hear.
Book
Structural Vibration Comfort: A Review of Recent Developments
With continuous improvements in the social economy and living standards of individuals, the vibration comfort of building structures has gradually been emphasized by academic and engineering communities, such as vehicle-induced vibrations in buildings near traffic, human-induced vibrations in large-span structures, wind-induced vibrations in super-high-rise buildings, and machinery-induced structural vibrations. Comfort-based structural analysis is distinct from traditional safety-based structural analysis, and its theoretical systems and unified guidelines have not yet been established. This paper reviews recent research on structural vibration comfort, including major load categories and their impacts, comfort-based structural analysis, evaluation methods, and vibration-mitigation measures. By presenting the shortcomings of the existing research, potential topics for future study are suggested.
Journal Article
Vibration response and isolation of X-shaped two-stage vibration isolators: Analysis of multiple parameters
To exploit its advantages in passive vibration isolation, an X-shaped structure is integrated into a two-stage vibration isolation system so as to realize the broadband vibration isolation capability. The Lagrange equation is employed to establish the nonlinear equation of motion of the proposed X-shaped two-stage vibration isolator, which takes into account both rotational and vertical displacements. The incremental harmonic balance method is used to examine the effects of the key parameters of the system on the frequency response characteristics and vibration isolation frequency bands. The correctness and feasibility of the present analytical approach are validated by comparing with the numerical simulation and the experimental results. The investigation results indicate that the vibration isolation frequency of the designed system can be as low as 2–5 Hz, and the performance of low-frequency vibration isolation can be improved considerably by softening nonlinearity. Additionally, systematic revelations behind the occurrence of softening-hardening, softening, and hardening nonlinear behaviors are made. To assess the effectiveness of the system in vibration isolation, random vibration tests are also conducted. In conclusion, the designed X-shaped two-stage mechanism offers a novel point of view on low-frequency vibration isolation.
Journal Article
Vibration attenuation of conical shell and stepped beam structure based on magnet-spring nonlinear energy sink (MS-NES)
Conical shells are widely used in engineering for their ease of manufacture and high load-bearing capacity, their flexibility often induces vibrations that affect the precision of instruments installed inside. This paper proposes a magnet-spring nonlinear energy sink (MS-NES) designed for broadband, low-frequency vibration reduction of the conical shell and stepped beam structure. Combining two pairs of vertically repulsive permanent magnets with two lateral springs creates a double potential well and a smooth negative stiffness segment. The MS-NES leverages internal resonance characteristics to rapidly capture and dissipate vibrational energy of the main structure, thereby achieving vibration reduction. The proposed MS-NES structure reduces the root mean square vibration displacement response at four measurement points of the conical shell and stepped beam structure by 2.36 dB within the 10–100 Hz frequency range, achieving a 71% improvement compared to the traditional tuned mass damper. Furthermore, through nonlinear dynamic analysis, it is pointed out that the internal resonance of MS-NES reduces the peak vibration response at the structure's natural frequency. In the end, the parametric study shows that the vibration reduction effect of the MS-NES weakens first and then strengthens as the mass increases, while increasing MS-NES damping can enhance broadband vibration reduction performance.
Journal Article
Vibration suppression of an elastic beam with boundary inerter-enhanced nonlinear energy sinks
Nonlinear vibration absorbers have been widely used for vibration suppression of elastic structures, but they were usually placed within the structures. However, designing such a vibration damping device within an engineering structure is possibly difficult. In this paper, an inertial nonlinear energy sinks (NES) is mounted on the boundaries of the elastic beam to suppress its vibration. Although this vibration suppression approach is more in line with engineering requirements, it introduces nonlinear oscillators at boundaries. This brings certain difficulties to the structural vibration analysis and the optimal absorber design. An approximate analytical approach for the steady-state response is developed in this work and verified by numerical solutions. The comparison with the uncontrolled system demonstrates the high-efficiency vibration suppression of the inertial NES installed on the boundary. Besides, the optimization of the NES parameters is performed. Resonance amplitude of the elastic structure can be reduced by 98% with the optimized NES. In summary, this paper proposes a novel approach to suppress the bending vibration of elastic structures through boundary NESs. The vibration reduction effect is very significant, and it is more feasible to implement. Therefore, this work is helpful to study the vibration of elastic structures with nonlinear boundaries and to promote the application of nonlinear vibration absorbers.Graphic abstractA boundary damping strategy is proposed to solve the problem of the difficulty of installing the vibration absorber in engineering. Introduce an inertial nonlinear energy sinks (NES) to reduce the weight of the shock absorber. The nonlinear boundary is separated and merged into the elastic beam vibration control equation to realize the decoupling of the continuum model. Resonance peak of the elastic structure can be reduced by 98% with the optimized NES. This work is helpful to study the vibration of elastic structures with nonlinear boundaries and to promote the application of nonlinear vibration absorbers.
Journal Article