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Non Gaussian Random Vibration Fatigue Analysis And Accelerated Test
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Book Synopsis Non-Gaussian Random Vibration Fatigue Analysis and Accelerated Test by : Yu Jiang
Download or read book Non-Gaussian Random Vibration Fatigue Analysis and Accelerated Test written by Yu Jiang and published by Springer Nature. This book was released on 2021-09-15 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the theory, method and application of non-Gaussian random vibration fatigue analysis and test. The main contents include statistical analysis method of non-Gaussian random vibration, modeling and simulation of non-Gaussian/non-stationary random vibration, response analysis under non-Gaussian base excitation, non-Gaussian random vibration fatigue life analysis, fatigue reliability evaluation of structural components under Gaussian/non-Gaussian random loadings, non-Gaussian random vibration accelerated test method and application cases. From this book, the readers can not only learn how to reproduce the non-Gaussian vibration environment actually experienced by the product, but also know how to evaluate the fatigue life and reliability of the structure under non-Gaussian random excitation.
Book Synopsis Vibration Fatigue by Spectral Methods by : Janko Slavič
Download or read book Vibration Fatigue by Spectral Methods written by Janko Slavič and published by Elsevier. This book was released on 2020-08-20 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibration Fatigue by Spectral Methods relates the structural dynamics theory to the high-cycle vibration fatigue. The book begins with structural dynamics theory and relates the uniaxial and multiaxial vibration fatigue to the underlying structural dynamics and signal processing theory. Organized in two parts, part I gives the theoretical background and part II the selected experimental research. The time- and frequency- domain aspects of signal processing in general, related to structural dynamics and counting methods are covered in detail. It also covers all the underlying theory in structural dynamics, signal processing, uniaxial & multiaxial fatigue; including non-Gaussianity and non-stationarity. Finally, it provides the latest research on multiaxial vibration fatigue and the non-stationarity and non-Gaussianity effects. This book is for engineers, graduate students, researchers and industry professionals working in the field of structural durability under random loading and vibrations and also those dealing with fatigue of materials and constructions. Introduces generalized structural dynamics theory of multiaxial vibration fatigue Maximizes understanding of structural dynamics theory in relation to frequency domain fatigue Illustrates connections between experimental work and theory with case studies, cross-referencing, and parallels to accelerated vibration testing
Download or read book Fatigue Damage written by Christi Lalanne and published by CRC Press. This book was released on 2002-03-29 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: About the Series: This important new series of five volumes has been written with both the professional engineers and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and crucially important areas of mechanical engineering, from both the theoretical and practical standpoints. As all products need to be designed to withstand the environmental conditions to which they are likely to be subjected, prototypes must be verified by calculation and laboratory tests, the latter according to specifications from national or international standards. The concept of tailoring the product to its environment has gradually developed whereby, from the very start of a design project, through the to the standards specifications and testing procedures on th e prototype, the real environment in which the product being tested will be functioning is taken into account. The five volumes of Mechanical Shock and Vibration cover all the issues that need to be addressed in this area of mechanical engineering. The theoretical analyses are placed in the context of the real world and of laboratory tests - essential for the development of specifications. Volume IV: Fatigue Damage Fatigue damage in a system with one degree of freedom is one of the two criteria applied when comparing the severity of vibratory environments. The same criterion is also employed for a specifciation representing the effects produced by the set of vibrations imposed in a real environment. In this volume, which is devoted to the calculation of fatigue damage, the author explores the hypotheses adopted to describe the behavior of material suffering fatigue and the laws of fatigue accumulation. He also considers the methods of counting the response peaks, which are used to establish the histogram when it is impossible to use the probability density of the peaks obtained with a Gaussian signal. The expressions for mean damage and its standard deviation are established and other hypotheses are tested.
Book Synopsis Vibration Testing by Non-Gaussian Random Excitations with Specified Kurtosis. Part I by : Alexander Steinwolf
Download or read book Vibration Testing by Non-Gaussian Random Excitations with Specified Kurtosis. Part I written by Alexander Steinwolf and published by . This book was released on 2014 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-Gaussian random vibration testing with kurtosis control is considered in the paper as a way of increasing or decreasing the excitation crest factor. An increase of crest factor is required for more accurate simulation of ground vehicle vibrations and the opposite action of crest factor decrease is useful in other applications, such as modal testing. Implementing kurtosis as an additional test specification leads to closed-form solutions for the requirement of the excitation high peak behavior being controlled simultaneously with the traditional power spectral density (PSD) control. A method of subjecting Gaussian signals to polynomial transformation is simpler but has an inherent tendency of introducing frequency distortions jeopardizing the PSD simulation. There is no such difficulty with another approach of phase manipulation in the inverse fast Fourier transform since the power spectrum is not influenced by the phases. A universal phase selection procedure capable of modeling non-Gaussian random excitations with a high or low kurtosis has been developed. Because of the analytical solution advantage, the proposed phase method can be implemented in automatic shaker testing systems with closed-loop control. This paper is the first in a series of two publications. Part II will present numerical and experimental results.
Book Synopsis Dynamical Systems: Theoretical and Experimental Analysis by : Jan Awrejcewicz
Download or read book Dynamical Systems: Theoretical and Experimental Analysis written by Jan Awrejcewicz and published by Springer. This book was released on 2016-09-17 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is the second volume of a collection of contributions devoted to analytical, numerical and experimental techniques of dynamical systems, presented at the international conference "Dynamical Systems: Theory and Applications," held in Łódź, Poland on December 7-10, 2015. The studies give deep insight into new perspectives in analysis, simulation, and optimization of dynamical systems, emphasizing directions for future research. Broadly outlined topics covered include: bifurcation and chaos in dynamical systems, asymptotic methods in nonlinear dynamics, dynamics in life sciences and bioengineering, original numerical methods of vibration analysis, control in dynamical systems, stability of dynamical systems, vibrations of lumped and continuous sytems, non-smooth systems, engineering systems and differential equations, mathematical approaches to dynamical systems, and mechatronics.
Book Synopsis Improved Fatigue Reliability and Accelerated Testing Methods for Vibratory Systems Under Gaussian and Non-Gaussian Excitation by :
Download or read book Improved Fatigue Reliability and Accelerated Testing Methods for Vibratory Systems Under Gaussian and Non-Gaussian Excitation written by and published by . This book was released on 2018 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue life estimation, reliability and durability are important in acquisition, maintenance and operation of vehicle systems. Fatigue is considered as one of the most important failure modes of a mechanical system. Fatigue life is random because of the stochastic load, the inherent variability of material properties and the uncertainty in the definition of the S-N curve. Degradation of the material properties of a system throughout time may cause unexpected fatigue failures that eventually increase the lifecycle costs due to warranty costs, repairs and loss of market share. This dissertation has two main parts. In the first part, fatigue life prediction methods are investigated for linear and non-linear systems excited by Gaussian and non-Gaussian loading. For the latter, a general methodology to calculate the statistics of the output process considering the effects of skewness and kurtosis is used. Real operational conditions of ground vehicles involve non-Gaussian loading whose characterization is challenging. The excitation is first characterized using the first four moments (mean, variance, skewness and kurtosis) and a correlation structure. Then, the first four moments and the correlation structure of the response process are calculated using Polynomial Chaos Expansion (PCE) and Karhunen-Loeve (KL) expansion. Simulated trajectories from the response stochastic metamodel are rainflow counted to obtain realizations of the fatigue life random variable based on Miner's damage model. Finally, the Saddlepoint Approximation (SPA) method provides the PDF and percentiles of the fatigue life. In the second part of this dissertation, we develop a new Accelerated Life Testing (ALT) methodology using Gaussian or non-Gaussian excitations without assuming the type of life distribution or the relationship between life and stress level. The accuracy of fatigue life prediction at nominal loading conditions is affected by model uncertainty (system model and fatigue model error) and material uncertainty such as the coefficients of the S-N curve. The uncertainty of fatigue life prediction is reduced by performing tests at higher loading levels. This reduces the test duration. We will develop an ALT methodology to minimize the cost of testing while improving the accuracy of fatigue life prediction. All dissertation developments will be demonstrated with representative examples.
Book Synopsis Advances in Guidance, Navigation and Control by : Liang Yan
Download or read book Advances in Guidance, Navigation and Control written by Liang Yan and published by Springer Nature. This book was released on 2023-02-10 with total page 7455 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book features the latest theoretical results and techniques in the field of guidance, navigation, and control (GNC) of vehicles and aircrafts. It covers a wide range of topics, including but not limited to, intelligent computing communication and control; new methods of navigation, estimation and tracking; control of multiple moving objects; manned and autonomous unmanned systems; guidance, navigation and control of miniature aircraft; and sensor systems for guidance, navigation and control etc. Presenting recent advances in the form of illustrations, tables, and text, it also provides detailed information of a number of the studies, to offer readers insights for their own research. In addition, the book addresses fundamental concepts and studies in the development of GNC, making it a valuable resource for both beginners and researchers wanting to further their understanding of guidance, navigation, and control.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock and Vibration Monograph Series by :
Download or read book Shock and Vibration Monograph Series written by and published by . This book was released on 1972 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Applied Reliability for Industry 2 by : Abdelkhalak El Hami
Download or read book Applied Reliability for Industry 2 written by Abdelkhalak El Hami and published by John Wiley & Sons. This book was released on 2023-05-09 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Reliability for Industry 2 illustrates the multidisciplinary state-of-the-art science of experimental reliability. Many experts are now convinced that reliability is not limited to statistical sciences. In fact, many different disciplines interact in order to bring a product to its highest possible level of reliability, made available through today’s technologies, developments and production methods. These three books, of which this is the second, propose new methods for analyzing the lifecycle of a system, enabling us to record the development phases according to development time and levels of complexity for its integration. Experimental reliability, as advanced in Applied Reliability for Industry 2, examines all the tools and testing methods used to demonstrate the reliability of the final mechatronic system.
Book Synopsis Vibration Testing by Non-Gaussian Random Excitations with Specified Kurtosis. Part II by : Alexander Steinwolf
Download or read book Vibration Testing by Non-Gaussian Random Excitations with Specified Kurtosis. Part II written by Alexander Steinwolf and published by . This book was released on 2014 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper is a follow-up to a preceding paper (Part I) in which two methods of non-Gaussian random vibration testing with adjustable kurtosis were introduced and motivation for kurtosis control as a way of increasing or decreasing the excitation crest factor was discussed. The current paper (Part II) adds numerical examples of automobile vibration simulation and experimental results for a kurtosis upgrade implemented in the same form of closed-loop control as in industrial shaker controllers. It was observed in experiments that the dynamic range of a kurtosis controller based on the polynomial transformation method was reduced and the handling of resonances worsened notably. These problems also arise with the sigma clipping technique of crest factor limiting. However, there are no such difficulties with the non-Gaussian method of phase manipulation in the inverse fast Fourier transform (IFFT). When using this method, the signal-to-noise ratio, the controller's dynamic range, and the stabilization time are as good as in standard Gaussian random testing. Evaluation of the performance of the proposed phase selection algorithm has shown that for increased kurtosis it ensures realistic variability of high peaks in terms of their amplitudes and positions, as well as the number of severe peaks per data block. Because of the analytical solution advantage, both methods, the polynomial transformation and the phase selection, meet time restrictions critical for the operation of shaker testing controllers.
Book Synopsis Mechanical Vibration and Shock Analysis, Sinusoidal Vibration by : Christian Lalanne
Download or read book Mechanical Vibration and Shock Analysis, Sinusoidal Vibration written by Christian Lalanne and published by John Wiley & Sons. This book was released on 2010-01-05 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical Vibration and Shock Analysis, Second Edition Volume 1: Sinusoidal Vibration The relative and absolute response of a mechanical system with a single degree of freedom is considered for arbitrary excitation, and its transfer function defined in various forms. The characteristics of sinusoidal vibration are examined in the context both of the real world and of laboratory tests, and for both transient and steady state response of the single-degree-of-freedom system. Viscous damping and then nonlinear damping are considered. The various types of swept sine perturbations and their properties are described and, for the one-degree-of-freedom system, the consequence of an inappropriate choice of sweep rate are considered. From the latter, rules governing the choice of suitable sweep rates are developed. The Mechanical Vibration and Shock Analysis five-volume series has been written with both the professional engineer and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and extremely significant areas of mechanical engineering, from both a theoretical and practical point of view. The five volumes cover all the necessary issues in this area of mechanical engineering. The theoretical analyses are placed in the context of both the real world and the laboratory, which is essential for the development of specifications.
Book Synopsis Fatigue Testing and Analysis by : Yung-Li Lee
Download or read book Fatigue Testing and Analysis written by Yung-Li Lee and published by Elsevier. This book was released on 2011-04-18 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue Testing and Analysis: Theory and Practice presents the latest, proven techniques for fatigue data acquisition, data analysis, and test planning and practice. More specifically, it covers the most comprehensive methods to capture the component load, to characterize the scatter of product fatigue resistance and loading, to perform the fatigue damage assessment of a product, and to develop an accelerated life test plan for reliability target demonstration. This book is most useful for test and design engineers in the ground vehicle industry. Fatigue Testing and Analysis introduces the methods to account for variability of loads and statistical fatigue properties that are useful for further probabilistic fatigue analysis. The text incorporates and demonstrates approaches that account for randomness of loading and materials, and covers the applications and demonstrations of both linear and double-linear damage rules. The reader will benefit from summaries of load transducer designs and data acquisition techniques, applications of both linear and non-linear damage rules and methods, and techniques to determine the statistical fatigue properties for the nominal stress-life and the local strain-life methods. Covers the useful techniques for component load measurement and data acquisition, fatigue properties determination, fatigue analysis, and accelerated life test criteria development, and, most importantly, test plans for reliability demonstrations Written from a practical point of view, based on the authors' industrial and academic experience in automotive engineering design Extensive practical examples are used to illustrate the main concepts in all chapters
Book Synopsis Accelerated Vibration Testing and Fatigue Life Under Random Vibration by : Ivan Petrovski
Download or read book Accelerated Vibration Testing and Fatigue Life Under Random Vibration written by Ivan Petrovski and published by . This book was released on 2006 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Random Vibration in Mechanical Systems by : Stephen H. Crandall
Download or read book Random Vibration in Mechanical Systems written by Stephen H. Crandall and published by Academic Press. This book was released on 2014-05-12 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: Random Vibration in Mechanical Systems focuses on the fundamental facts and theories of random vibration in a form particularly applicable to mechanical engineers. The book first offers information on the characterization and transmission of random vibration. Discussions focus on the normal or Gaussian random process; excitation-response relations for stationary random processes; response of a single-degree-of-freedom system to stationary random excitation; wide-band and narrow-band random processes; and frequency decomposition of stationary random processes. The text then examines failure due to random vibration, including failure due to first excursion up to a certain level; fatigue failure due to a stationary narrow-band random stress process; failure due to an accumulation of damage; failure due to response remaining above a certain level for too great a fraction of the time; and failure mechanisms. The manuscript is a vital reference for mechanical engineers and researchers interested in random vibration in mechanical systems.
Book Synopsis Accelerated Testing by : Wayne B. Nelson
Download or read book Accelerated Testing written by Wayne B. Nelson and published by John Wiley & Sons. This book was released on 2009-09-25 with total page 626 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Wiley-Interscience Paperback Series consists of selected books that have been made more accessible to consumers in an effort to increase global appeal and general circulation. With these new unabridged softcover volumes, Wiley hopes to extend the lives of these works by making them available to future generations of statisticians, mathematicians, and scientists. ". . . a goldmine of knowledge on accelerated life testing principles and practices . . . one of the very few capable of advancing the science of reliability. It definitely belongs in every bookshelf on engineering." –Dev G. Raheja, Quality and Reliability Engineering International ". . . an impressive book. The width and number of topics covered, the practical data sets included, the obvious knowledge and understanding of the author and the extent of published materials reviewed combine to ensure that this will be a book used frequently." –Journal of the Royal Statistical Society A benchmark text in the field, Accelerated Testing: Statistical Models, Test Plans, and Data Analysis offers engineers, scientists, and statisticians a reliable resource on the effective use of accelerated life testing to measure and improve product reliability. From simple data plots to advanced computer programs, the text features a wealth of practical applications and a clear, readable style that makes even complicated physical and statistical concepts uniquely accessible. A detailed index adds to its value as a reference source.
Book Synopsis On the Use of Kurtosis Control Methods in Shaker Testing for Fatigue Damage by : A. Steinwolf
Download or read book On the Use of Kurtosis Control Methods in Shaker Testing for Fatigue Damage written by A. Steinwolf and published by . This book was released on 2020 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Random vibration testing with increased kurtosis introduces high peaks into shaker drive signals to simulate land vehicle vibration more accurately and also to shorten the required test time. Two methods of controlling kurtosis by phase manipulation in the inverse fast Fourier transform were implemented, tested, and compared. The first method generates high-kurtosis excitations with a gradual, smooth pattern of peak heights from low to high, and the second method produces isolated high peaks with intervals of stable background vibration between them. When applying a kurtosis increase for accelerated fatigue damage testing, the kurtosis control method must be able to pass high-kurtosis values from the generated shaker table vibration into the stress response of the unit under test. However, this is not always the case, and only one of the considered methods was capable of doing so. In the article, the fatigue damage spectrum model was used for an evaluation of the time to failure. An experimental study was carried out using operational vibration measured in a car. Shaker testing of cantilever specimens was performed for Gaussian, non-Gaussian, and accelerated non-Gaussian excitations.
