التفاصيل البيبلوغرافية
| العنوان: |
Dispersion Curve Estimation for Longitudinal Rail Stress Measurement |
| المؤلفون: |
Corbin, Nicholas Allen |
| المساهمون: |
Engineering Science and Mechanics, Tarazaga, Pablo Alberto, Domann, John P., Ross, Shane D. |
| بيانات النشر: |
Virginia Tech |
| سنة النشر: |
2021 |
| المجموعة: |
VTechWorks (VirginiaTech) |
| مصطلحات موضوعية: |
Non-destructive evaluation, dispersion curve, spectrum relation, stress measurement, wave propagation, rail neutral temperature |
| الوصف: |
There currently exists no reliable, non-destructive method for measuring stress in railroads and other similar structures without the need for a calibration measurement. Major limitations which have hindered previous techniques include sensitivity to boundary conditions, insensitivity to stress, and intolerance for material and geometry uncertainty. In this work, a technique is developed which seeks to solve these challenges by extracting the spectrum relation, or dispersion curve, of a waveguide from dispersive wave propagation meaasurements. The technique is based on spectral analysis of waves in structures modeled as beams, and as such is based on relatively low frequency vibrations, as opposed to other techniques which use nonlinear elastic modeling of structures at ultrasonic frequencies. The major contribution of this work is the development of a frequency-domain based signal processing technique which is capable of compensating for the dispersive, long wavelength reflections which have limited the ability of previous techniques to go low enough in frequency to achieve high stress sensitivity. By compensating for reflections, the present work is able to automate the process of analyzing wave propagation signals such that the entire dispersion curve can be extracted, enabling the identification of various parameters including stress, stiffness, density, and other material and geometry properties. This in turn enables measuring stress, performing model-updating for material and geometry uncertainty, and being indifferent to boundary conditions. The theory and algorithmic implementation is presented, along with simulations and experimental validation on a rectangular beam. ; Master of Science ; The ability to detect damage or the potential for damage in structures is highly desirable, especially in industries such as civil infrastructure in which failure can be incredibly costly and dangerous. In particular, non-destructive techniques which can predict failure without interfering with the operations of a ... |
| نوع الوثيقة: |
thesis |
| وصف الملف: |
ETD; application/pdf; application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| اللغة: |
unknown |
| العلاقة: |
vt_gsexam:32095; http://hdl.handle.net/10919/113673Test |
| الإتاحة: |
http://hdl.handle.net/10919/113673Test |
| حقوق: |
In Copyright ; http://rightsstatements.org/vocab/InC/1.0Test/ |
| رقم الانضمام: |
edsbas.956E06C9 |
| قاعدة البيانات: |
BASE |
