Finite element analysis offers an effective predictive capability for modelling. Obtain modal solution block lancosmissing mass pcg lancosmissing mass supernode 3. The overall objective is to detect, localize, identify and quantify the. Image acquisition the study of rock minerals and textures is called petrography 12. The method is not practical for large systems since two unknown coefficients must be introduced for each mode shape. Porosity determination using modal analysis on thin sections of rock and gore material and simulatet well cuttings springerlink.
Ansys tutorial modal harmonic analysis using ansys me 510499 vibroacoustic design. Quantitative analysis of the joint variability of rock. Textural and mineralogical descriptions of hole 735b core are based on shipboard data and descriptions of 298 thin sections by the authors. Suggested method for petrographic description of rocks. His notes go over concepts and problems covered during the recitation sections he taught, and may not precisely correspond to the content covered in the above recitation video. Geological image processing of petrographic thin sections. So, basically, modal analysis is the study of the natural characteristics of structures. Statistical test of reproducibility and operator variance in.
The theory of thinsection analysis the journal of geology. Modal analysis of rock using point counting method on the scanned images of thin sections conference paper pdf available february 2016 with 972 reads how we measure reads. Spectrum analysis summary singlepoint response spectrum sprs 1. Quantitative modal analysis is used to determine the volumetric proportions of the minerals that make up the rock, determined by areal analysis of a thin section. Handbook of materials failure analysis with case studies from the oil and gas industry, 2016.
Pdf combined rock and thin section modal analysis researchgate. Porosity determination using modal analysis on thin. Property 1, the modal composition, is based on 500 p or 300 c, m, f point counted per thin section. Schematic thin section representation of parent rocks and sediments to illustrate acquisition protocol used for estimation of the first three fundamental properties as well as data sources. A quarter circle fixed at the end, bending and torsion of a thinwalled hollow round section.
Equipment to determine the quantitative mineral composition, by volume, of a rock modal analysis typically comprises l. In optical mineralogy and petrography, a thin section is a laboratory preparation of a rock, mineral, soil, pottery, bones, even metal sample for use with a polarizing petrographic microscope, electron microscope and electron microprobe. Image analysis was developed from the traditional methods of modal analysis. Analysis results obtained after testing discussed in the results section of this report show that many more sensors are necessary to fully measure the vibration modal characteristics of the tubes up to 2000 hz. Practice for determining volume fraction by systematic manual point count. Section 033000 castinplace concrete for concrete topping andplacing connection anchors in concrete. Autodesk robot structural analysis professional verification manual afnor benchmarks.
The technique is a version of point counting that estimates with considerable precision the amounts of human additives temper and natural inclusions silt and sand in ceramic pastes. Statistical test of reproducibility and operator variance. Schematic thinsection representation of parent rocks and sediments to illustrate acquisition protocol used for estimation of the first three fundamental properties as well as data sources. Basics of modal testing and analysis crystal instruments. There is a paucity of modal analyses of lunar rocks and an abundance of readily availabl e digital thin sections, thus future petrographic. Rock thin sections petrographic thin section preparation. Porosity determination using modal analysis on thin sections. Standard practice for determining the components of.
Porosities of rock samples obtained by modal analysis and by the gas expansion method are compared. Thin section petrography is the study of microscopic. This procedure describes a petrographic modal point count method for determining the volume fractions of identifiable constituents in a slide thin section, using a. The sliders were then given to the petrographer operators for quantitative thinsection modal pointcount analysis of cryptocrystalline, spherulitic, granophyric, and void textures, as well as phenocryst minerals. The number of points counted per thin section, and therefore the labor intensiveness of the analysis, depends upon the precision required. A thinsection analysis provides an unbiased estimate of the areal composition of the surface measured. Petrographic analysis provides a detailed description of the texture grain size, sorting, and grain contacts, sedimentary structures laminations, bioturbation, framework grain composition, authigenic minerals, and types and distribution of macroporosity seen in a. Measuring sandstone compaction from modal analyses of thin.
Opaque materials can be sawed and polished and then examined using re flected light techniques. Pdf modal analysis of rock using point counting method on. Xray maps of thin sections that were collected by hicks 7 on a cameca sx 50 electron microprobe emp were used in this study, in order to provide control on the accuracy of the results obtained from studying shergotty, nwa 733, and a schist. Modal harmonic analysis using ansys me 510499 vibroacoustic design dept. Petrographic analysis provides a detailed description of the texture grain size, sorting, and grain contacts, sedimentary structures laminations, bioturbation, framework grain composition, authigenic minerals, and types and distribution of macroporosity seen in a thin section. Results indicate that modal analysis is a suitable method for determining porosities of rock samples, especially well cuttings. The tradition that only unoriented or weakly oriented rocks are suitable for modal analysis is unfounded. Nesbitt and others published combined rock and thin section modal analysis find, read and cite all the research. Inplane modal analysis of a metalayer formed by arrayed pairs of. Analytical modal analysis modal analysis is the process of characterizing the dynamic response of a system in terms of its modes of vibration.
Ansys tutorial modalharmonic analysis using ansys me 510499 vibroacoustic design. This section details our proposed method of using edge and colour analysis to perform pixelwise classification of rock thin section image as either quartz or accessory minerals. Today, modal analysis has become a widespread means of finding the modes of vibration of a machine or structure figure 3. There is a paucity of modal analyses of lunar rocks and an abundance of readily availabl e digital thin sections, thus future petrographic studies could benefit from digital modal analyses.
Inplane modal analysis of a metalayer formed by arrayed. Modal analysis of rock using point counting method on the scanned images of thin sections. Handbook of materials failure analysis with case studies from the oil and gas industry, 2016 related terms. The original thinsection labels were opaqued out with removable enamel and renumbered with alphanumeric labels.
This procedure is called numerical modal analysis 5. Ar a point counting application for petrographic thin sections. Examples would include measuring the vibration of a cars body when it is attached to a shaker, or the noise pattern in a room when excited by a loudspeaker modern day experimental modal analysis systems are composed of 1 sensors such as transducers typically accelerometers, load cells, or non contact. The study of mineral grains in thin sections of rock using a petrographic microscope. Modal analysis involves identification of rock constituents at a number of locations, or points, in a thin section. Modal analysis pdf these recitation notes were compiled by prof. Modal analysis is the study of the dynamic properties of systems in the frequency domain. Digital image analysis in microscopy for objects and architectural. Procedure for determination of volume constituents in thin. The technique is a version of point counting that estimates with considerable precision the amounts of human additives temper and natural inclusions silt. Statistical analyses of the results on the test series, discussion of the overall variation in the core hole on the basis of the visual and modal analyses, and conclusions are presented in part iv. Unsupervised classification of intrusive igneous rock thin.
Results indicate that modal analysis is a suitable meth porosity determination using modal analysis on thin sections of rock and gore material and simulatet well cuttings springerlink. Modal analysis were performed following point counting method thousand points of minerals were analyzed per each thin section. A quantitative approach to the petrographic analysis of. Pointcounting is a technique utilized by our geologist petrographers to get an approximate modal composition of the rock. The sliders were then given to the petrographer operators for quantitative thin section modal pointcount analysis of cryptocrystalline, spherulitic, granophyric, and void textures, as well as phenocryst minerals. Introduction exact solution of the free vibration problems is where coefficients can be determined from the initial conditions. The making of thin sections i6 sample examination 17 equipment and materials 17 microscopic examination 17 section analysis with reflected light 18 thin section 20 calculations for modal analysis of aggregate, air voids and paste 21 xrd 23 page 2.
Modal analysis is widely used for solving vibration problems that identify the modal parameters, natural frequencies, damping, and mode shapes of the structure under testing. Orientation of the rock or of the thin section with regard to some structure element of the rock may improve or reduce the efficiency of the sampling but will not in itself bias the result. Modal analysis and controls laboratory mechanical engineering department university of massachusetts lowell modal analysis applications spring 2002 dr. Modal harmonic analysis using ansys me 510499 vibroacoustic design mesh the line and apply b. A demonstration is given to show the feasibility of carrying out thinsection grain size analyses on some almost pure carbonate calcarenites.
Modalharmonic analysis using ansys me 510499 vibroacoustic design mesh the line and apply b. Understanding both the natural frequency and mode shape helps to design my structural system for noise and vibration applications. Autodesk robot structural analysis professional verification manual afnor benchmarks march 2014 page 1 73 introduction this verification manual contains a range of static and dynamic benchmark tests covering fundamental types of behaviour encountered in structural analysis. Modal analysis is the processes of determining the inherent dynamic characteristics of any system and using them to formulate a mathematical model of the dynamic behavior of the system. Modal analysis is a process for determining the systems modal parameters, including natural frequency and mode shape. Vibration analysis by mode superposition engineering. A thin sliver of rock is cut from the sample with a diamond saw and ground optically flat. In a crossstratified coquina from the miocene of salum, egypt, grain size measurments were made on certain bioclasts that are relatively resistant to diagenetic changes.
Calculation of compactional porosity loss from modal analyses of thin sections is a useful technique for characterizing the diagenesis and porosity evolution of sandstone reservoirs. Modal quantitative mineralogical analysis of rocks and ores in thin sections is one of the first fundamental quantitative methods of mineralogy including technological mineralogy, petrography in classifications of rocks and ores, and petrological reconstructions, and lithology i. For modal analysis, the ratio of amplitudes and the difference in phase angles are important. This paper introduces a new technique for the quantitative analysis of ceramic thin sections through petrography. Statistical analyses of the results on the test series, discussion of the overall variation in the core hole on the basis of the visual and modal analyses, and conclusions are presented in. When a misclassification occurs, a builtin manual override can be. Pdf modal analysis of rock using point counting method. Point counter for the modal analysis of thin sections of mineral aggregate. Analysis of modal composition of rocks point counting.
Precast structural concrete with commercial architectural finish. Modal analysis of rocks and ores in thin sections springerlink. Analytical modal analysis depends on the generation of the equations of motion of a system through a finite element model. In every development of a new or improved mechanical product, structural dynamics testing on product prototypes is used to assess its real dynamic behavior. Finite element analysis offers an effective predictive capability for modelling the thinwalled structures. A randomly chosen area provides an unbiased estimate of composition by volume. If you have a question on some aspect of modal analysis, just contact us. In the past two decades it has become a major technological tool in the quest for determining, improving and optimizing dynamic characteristics of engineering. Thinsection mechanical analysis of a miocene coquina from. To obtain meaningful results, however, it is essential to assume an appropriate value for the original porosity and to use pointcounting categories that clearly. Finiteelement vibration analysis and modal testing of.
Test method t226 petrographic examination of rock in thin section and polished thin section. Abstract this thesis presents two novel nonlinear modal analysis methods, aimed at the identification of representative engineering structures. Amplitude and phase of acceleration recorded at first and second natural. Interactive deformation using modal analysis with constraints. The original thin section labels were opaqued out with removable enamel and renumbered with alphanumeric labels. Nesbitt and others published combined rock and thin section modal analysis find, read and cite all the research you need on researchgate. Image analysis by pixel counting is a quantitative method for determining the modal abundances. Pdf modal analysis of rock using point counting method on the. Theoretical foundations of structural dynamics in the section, the theoretical foundations of structural dynamics and modal analysis are presented under the assumption of linear behavior.
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