Relevant bibliographies by topics / Curvature mode shape

Contents

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

Academic literature on the topic 'Curvature mode shape'

Author: Grafiati
Published: 30 June 2021
Last updated: 3 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Curvature mode shape.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Curvature mode shape"

1

Gorgin, Rahim, and Ziping Wang. "Structural Damage Identification Based on Principal Curvatures of Mode Shape." International Journal of Acoustics and Vibration 25, no. 4 (December 30, 2020): 566–76. http://dx.doi.org/10.20855/ijav.2020.25.41714.

Full text
Abstract:
This paper presents a procedure for damage identification and characterization on plates, based on the principal curvatures of their first mode shape. Each mode shape represents the displacement of the structure at its corresponding natural frequency. Since, variations in the geometry due to cracks or material property degradation, make changes in the mode shapes of the structure, such changes can be used for damage identification methods. The presented procedure only requires the first mode shape of the intact and damaged structure. It is shown that the principal curvatures of the surface defined by the first mode shape of the structure, are sensitive to damage and the maximum principal curvature can be used to highlight damages on the structure. The performance of the developed method is firstly evaluated using finite element analysis. To this aim, the procedure is applied to highlight both single and multi-damages in different locations of the plate with different boundary conditions. It is shown that the location of the maximum curvature variation coincides well with the location of damages and the amount of the maximum curvature change can be used as a parameter to describe damage severity. The accuracy of the proposed method is also experimentally verified by test on an aluminum plate and it is demonstrated that the proposed method remains effective even in experimental condition when only a limited number of measurements are available.
APA, Harvard, Vancouver, ISO, and other styles
2

Guo, Jin Quan, Fen Lan Ou, Jian Feng Zhong, Shun Cong Zhong, Xiao Xiang Yang, and Li Gang Yao. "Damage Detection of Cantilever Beams Based on Derivatives of Mode Shapes." Applied Mechanics and Materials 488-489 (January 2014): 817–20. http://dx.doi.org/10.4028/www.scientific.net/amm.488-489.817.

Full text
Abstract:
For the small crack detection (crack ration less than 5%), the derivatives of mode shapes of cantilever beams were used for crack detection in the beams. These derivatives consist of the slope, curvature and rate of curvature, which are the first, second and third derivatives of the displacement mode shape respectively. The presence of a crack results in a slight change in the mode shape of a structure which is manifested as a small discontinuity in the response at the crack location. It is hard to detect small cracks in beams using the direct data of mode shape change. But when the first, second and third derivatives of the displacement mode shape, that is the slope, curvature and rate of curvature, respectively, of the cracked cantilever beam provide a progressively better indication of the presence of a crack. However, `noise' effects due to the difference approximation error also begin to be magnified at higher derivatives so that it is not advantageous to go beyond the third derivatives of mode shapes. For the intact beam, these derivatives are smooth curves. So the local peaks or discontinuity on the slope, curvature and rate of curvature modal curves can be used to indicate abnormal mode shape changes at those positions. In this way, these local peak positions can be used to detect and locate cracks in the structure. The modal responses of the damaged and intact cantilever beams used were computed using the finite element method.
APA, Harvard, Vancouver, ISO, and other styles
3

Rucevskis, S., and M. Wesolowski. "Identification of Damage in a Beam Structure by Using Mode Shape Curvature Squares." Shock and Vibration 17, no. 4-5 (2010): 601–10. http://dx.doi.org/10.1155/2010/729627.

Full text
Abstract:
During the last decades a great variety of methods have been proposed for damage detection by using the dynamic structure characteristics, however, most of them require modal data of the structure for the healthy state as a reference. In this paper the applicability of the mode shape curvature squares determined from only the damaged state of the structure for damage detection in a beam structure is studied. To establish the method, two aluminium beams containing different-size mill-cut damage at different locations are tested by using the experimentally measured modal data. The experimental modal frequencies and the corresponding mode shapes are obtained by using a scanning laser vibrometer with a PZT actuator. From the mode shapes, mode shape curvatures are obtained by using a central difference approximation. With the example of the beams with free-free and clamped boundary conditions, it is shown that the mode shape curvature squares can be used to detect damage in the structures. Further, the extent of a mill-cut damage is identified via modal frequencies by using a mixed numerical-experimental technique. The method is based on the minimization of the discrepancy between the numerically calculated and experimentally measured frequencies.
APA, Harvard, Vancouver, ISO, and other styles
4

Ručevskis, Sandris, and Andris Chate. "DAMAGE IDENTIFICATION IN A PLATE-LIKE STRUCTURE USING MODAL DATA." Aviation 17, no. 2 (July 1, 2013): 45–51. http://dx.doi.org/10.3846/16487788.2013.805863.

Full text
Abstract:
In this paper, an on-going research effort aimed at detecting and localising damage in plate-like structures by using mode shape curvature–based damage detection algorithms is described. Two alternative damage indexes are examined. The first one uses exclusively mode shape curvature data from the damaged structure. This method was originally developed for beam-like structures. In this paper, the method is generalised to plate-like structures that are characterised by two-dimensional mode shape curvature. To examine limitations of the method, several sets of simulated data are applied and damage detection results are compared to the damage identification method that requires mode shape information from both the undamaged and the damaged states of the structure. The modal frequencies and the corresponding mode shapes for the first 15 modes of a plate are obtained via finite element models. Simulated test cases include damage of various levels of severity. In order to ascertain the sensitivity of the proposed method to noisy experimental data, numerical mode shapes are corrupted with different levels of random noise.
APA, Harvard, Vancouver, ISO, and other styles
5

Rucevskis, Sandris, Pavel Akishin, and Andris Chate. "Numerical and Experimental Study on the Application of Mode Shape Curvature for Damage Detection in Plate-Like Structures." Solid State Phenomena 220-221 (January 2015): 264–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.264.

Full text
Abstract:
The paper describes on-going research effort at detecting and localizing damage in plate-like structures using mode shape curvature based damage detection algorithm. The proposed damage index uses data on exclusively mode shape curvature from the damaged structure. This method was originally developed for beam-like structures. The article generalizes the method of plate-like structures characterized by two-dimensional mode shape curvature. To examine limitations of the method, several sets of simulated data are applied and the obtained results of the numerical detection of damage are validated by comparing them with the findings of the case of the experimental test. The simulated test cases include the damage of various levels of severity. In order to ascertain the sensitivity of the proposed method for noisy experimental data, numerical mode shapes are corrupted with different levels of random noise. Modal frequencies and corresponding mode shapes of an aluminium plate containing mill-cut damage are obtained via finite element models for numerical simulations and by using a scanning laser vibrometer (SLV) for the experimental study.
APA, Harvard, Vancouver, ISO, and other styles
6

Yan, Guirong, Xuelin Peng, and Hong Hao. "Localization of free-spanning damage using mode shape curvature." Journal of Physics: Conference Series 305 (July 19, 2011): 012017. http://dx.doi.org/10.1088/1742-6596/305/1/012017.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Roy, Koushik. "Structural Damage Identification Using Mode Shape Slope and Curvature." Journal of Engineering Mechanics 143, no. 9 (September 2017): 04017110. http://dx.doi.org/10.1061/(asce)em.1943-7889.0001305.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Pavlova, Anastasia V., Judith R. Meakin, Kay Cooper, Rebecca J. Barr, and Richard M. Aspden. "Variation in lifting kinematics related to individual intrinsic lumbar curvature: an investigation in healthy adults." BMJ Open Sport & Exercise Medicine 4, no. 1 (July 2018): e000374. http://dx.doi.org/10.1136/bmjsem-2018-000374.

Full text
Abstract:
ObjectiveLifting postures are frequently implicated in back pain. We previously related responses to a static load with intrinsic spine shape, and here we investigate the role of lumbar spine shape in lifting kinematics.MethodsThirty healthy adults (18–65 years) performedfreestyle,stoopandsquatlifts with a weighted box (6–15 kg, self-selected) while being recorded by Vicon motion capture. Internal spine shape was characterised using statistical shape modelling (SSM) from standing mid-sagittal MRIs. Associations were investigated between spine shapes quantified by SSM and peak flexion angles.ResultsTwo SSM modes described variations in overall lumbar curvature (mode 1 (M1), 55% variance) and the evenness of curvature distribution (mode 2 (M2), 12% variance). M1 was associated with greater peak pelvis (r=0.38, p=0.04) and smaller knee flexion (r=–0.40, p=0.03) angles; individuals with greater curviness preferred to lift with a stooped lifting posture. This was confirmed by analysis of those individuals with very curvy or very straight spines (|M1|>1 SD). There were no associations between peak flexion angles and mode scores instooporsquattrials (p>0.05). Peak flexion angles were positively correlated betweenfreestyleandsquattrials but not betweenfreestyleandstooporsquatandstoop, indicating that individuals adjusted knee flexion while maintaining their preferred range of lumbar flexion and that ‘squatters’ adapted better to different techniques than ‘stoopers’.ConclusionSpinal curvature affects preferred lifting styles, and individuals with curvier spines adapt more easily to different lifting techniques. Lifting tasks may need to be tailored to an individual’s lumbar spine shape.
APA, Harvard, Vancouver, ISO, and other styles
9

Qiao, Pizhong, Kan Lu, Wahyu Lestari, and Jialai Wang. "Curvature mode shape-based damage detection in composite laminated plates." Composite Structures 80, no. 3 (October 2007): 409–28. http://dx.doi.org/10.1016/j.compstruct.2006.05.026.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Fan, R., S. K. Singh, and C. D. Rahn. "Modal Analysis of Ballooning Strings With Small Curvature." Journal of Applied Mechanics 68, no. 2 (August 29, 2000): 332–38. http://dx.doi.org/10.1115/1.1355776.

Full text
Abstract:
During the manufacture and transport of textile products, yarns are rotated at high speed. The surface of revolution generated by the rotating yarn is called a balloon. The dynamic response of the balloon to varying rotation speed, boundary excitation, and aerodynamic disturbances affects the quality of the associated textile product. Resonance, in particular, can cause large tension variations that reduce product quality and may cause yarn breakage. In this paper, the natural frequencies and mode shapes of a single loop balloon are calculated to predict resonance. The three-dimensional nonlinear equations of motion are simplified under assumptions of small displacement and quasi-static axial motion. After linearization, Galerkin’s method is used to calculate the mode shapes and natural frequencies. Experimental measurements of the steady-state balloon shape and the first two natural frequencies and mode shapes are compared with theoretical predictions.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Curvature mode shape"

1

Mehdizadeh, Mohammad, and n/a. "Curvature Mode Shape Analyses of Damage in Structures." RMIT University. Aerospace, Mechanical & Manufacturing Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091022.154814.

Full text
Abstract:
In recent years, the use of composite structures in engineering application has increased. This is mainly due to their special advantages such as high structural performance, high corrosion resistance, tolerance of temperature; extreme fatigue resistance and high strength/weight ratio. However, some disorders like fibre breakage, matrix cracking and delaminations could be caused by operational loading, aging, chemical attack, mechanical vibration, changing of ambient conditions and shock etc. during the service. Although these disorders are hardly visible, they can severely reduce the mechanical properties and the load carrying capability of the composite structure. The aim of this research project is to develop a Vibration-based Structural Health Monitoring (SHM) method for carbon/epoxy composite beam specimens with the embedded artificial delaminations. The Laser Vibrometer Machine was used to excite the beams and gather the responses of the structure to the excitations. The physical properties such as frequency, velocity, mode shapes, and damping of the defective beams were measured. By using a C-SCAN machine, the accuracy of the positions of the delaminations was verified to be about 95% is accurate. Curvature mode shapes as a scalable damage detection parameter is calculated using an analytical model based on the Heaviside step function and the Central Difference Approximation (CDA) technique. The vibration-based damage detection method is then obtained using the difference between curvature mode shapes of the intact and damaged carbon/epoxy beams. An accurate prediction of 90% was attained. These results are proposed and discussed in detail in this study. Finally, the Fatigue Crack Propagation Test was applied on Samples with embedded delamination to extend the crack. The ASTM E399-90 standard is used for the experiment and a careful fatigue crack growth routine was designed and implemented to advance the delamination in a controlled manner. The total extension of 17 mm was observed with Microscope. The total propagation as determined by the curvature mode plots was 17.84 mm.
APA, Harvard, Vancouver, ISO, and other styles
2

Deshmukh, Prutha. "Damage Detection Of a Cantilever Beam Using Digital Image Correlation." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1623169831665585.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Yamamoto, Kyosuke. "Bridge Damage Identification Using Vehicle Response." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/159406.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Hu, Min. "Local variation in bending stiffness in structural timber of Norway spruce : for the purpose of strength grading." Licentiate thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-38119.

Full text
Abstract:
Most strength grading machines on the European market use an averagemodulus of elasticity (MOE), estimated on a relatively large distance along awood member, as the indicating property (IP) to bending strength. Theaccuracy of such grading machines in terms of coefficient of determination israther low at R2 ≈ 0.5. This research is motivated by a desire to increase theaccuracy of the strength grading in the industry today. The aim of the presentstudy is to contribute knowledge of local variation in bending stiffness/MOEwith high resolution and thus locate weak sections due to stiffness reducingfeatures (the most important is knots) for structural timber.The present study introduces three methods that involve structural dynamics,classical beam theory and optical measurement to assess local wood stiffness.Specifically: The dynamic method, in which a wood member is treated as an ordinaryphysical structure and the local stiffness is studied by exploring itsdynamic properties. In Method II, a bending MOE profile is established based on local fibre angle information. The local fibre orientation is detected through highresolution laser scanning based on the tracheid effect.  For Method III, a bending MOE profile is established using surfacestrain information under four-point bending. A high resolution strainfield is obtained using the digital image correlation (DIC) technique. From the present study, the two latter methods are more favourable inevaluating the local stiffness within a piece of structural timber. Moreover, thestudy reveals that the established bending MOE profiles using the two lattermethods, i.e. based on information of the local fibre angle and surface strain,agree reasonably well. However, for some patterns of knot clusters, the localbending MOE, calculated on the basis of fibre angles, is significantly higherthan the local bending MOE estimated on the basis of surface strain.
De flesta av de utrustningar för hållfasthetssortering som utnyttjas på deneuropeiska marknaden använder ett medelvärde på elasticitetsmodulen(MOE), beräknat på en relativt stor längd av en sågad planka, som indikativparameter (IP). Sådan hållfasthetssortering ger en noggrannhet i termer avförklaringsgrad på R2 ≈ 0.5, vilket är ganska lågt. Arbetet i denna studiemotiveras av en önskan att öka noggrannheten i hållfasthetssorteringen. Syftetmed denna studie är att bidra med kunskap om lokala variationer iböjstyvhet/MOE med hög upplösning och att lokalisera veka snitt (där kvistarär den viktigaste försvagande faktorn) för konstruktionsvirke.Den aktuella studien introducerar tre metoder som omfattar strukturdynamik,klassisk balkteori och optisk mätning vid bedömningen av lokal styvhet imaterialet. Specifikt:  Metod I, där den lokala böjstyvheten studerades genom de dynamiskaegenskaperna såsom egenfrekvens och modform.  Metod II, där en MOE profil beräknas på basis av information om lokalafibervinklar på ett virkesstyckes ytor. Den lokala fiberorienteringen mätsmed högupplöst laserskanning baserad på den så kallade trakeideffekten.  Metod III, där en MOE-profil fastställdes med hjälp avtöjningsinformation för en hel flatsida av en planka belastad med konstantböjmoment. Det högupplösta töjningsfältet erhölls med hjälp av teknikför Digital Image Correlation (DIC). Studien visar att de två sistnämnda metoderna är mycket lämpade för attutvärdera den lokala styvheten i ett virkesstycke. Dessutom visar studien att deMOE-profiler som togs fram med hjälp av de två sistnämnda metoderna,vilka baseras på information om lokala fibervinklar och töjningsfältet på ytan,stämde överens för större delen av virkesstycket. För visa kvistgrupper kan dock den lokala böjstyvheten högre med metoden baserad på fibervinklar.
APA, Harvard, Vancouver, ISO, and other styles
5

Oruganti, Krishna, and krishnaov@yahoo com. "Evaluation of Damage in Structures using Vibration-based Analyses." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091002.143408.

Full text
Abstract:
Composite materials are supplanting conventional metals in aerospace, automotive, civil and marine industries in recent times. This is mainly due to their high strength and light weight characteristics. But with all the advantages they have, they are prone to delamination or matrix cracking. These types of damage are often invisible and if undetected, could lead to appalling failures of structures. Although there are systems to detect such damage, the criticality assessment and prognosis of the damage is often more difficult to achieve. The research study conducted here primarily deals with the structural health monitoring of composite materials by analysing vibration signatures acquired from a laser vibrometer. The primary aim of the project is to develop a vibration based structural health monitoring (SHM) method for detecting flaws such as delamination within the composite beams. Secondly, the project emphasises on the method's ability to recognise the locatio n and severity of the damage within the structure. The system proposed relies on the examination of the displacement mode shapes acquired from the composite beams using the laser vibrometer and later processing them to curvature mode shapes for damage identification and characterization. Other identification techniques such as a C-scan has been applied to validate the location and size of the defects with the structures tested. The output from these plots enabled the successful identification of both the location and extent of damage within the structure with an accuracy of 96.5%. In addition to this, this project also introduces a method to experimentally compute the critical stress intensity factor, KIC for the composite beam. Based on this, a technique for extending the defect has been proposed and validated using concepts of fatigue and fracture mechanics. A composite specimen with a 40 mm wide delamination embedded within was loaded under fatigue conditions and extension of the defect by 4mm on either s ide of the specimen's loading axis was achieved satisfactorily. The experimental procedure to extend the defect using fatigue was validated using the SLV system. Displacement and Curvature mode shapes were acquired post-fatigue crack extension. Upon analysing and comparing the displacement and curvature mode shapes before and after crack extension, the extended delamination was identified satisfactorily.
APA, Harvard, Vancouver, ISO, and other styles
6

Camp, John L. "3-D Model Characterization and Identification from Intrinsic Landmarks." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1323135521.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Chillara, Venkata Siva Chaithanya. "Multifunctional Laminated Composites for Morphing Structures." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524104865278235.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Hwang, Yih-Herng, and 黃奕衡. "Application of curvature mode shape scheme for damage detection of bridge structures using Neural Network approach." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/39852675845610982893.

Full text
Abstract:
碩士
國立中央大學
土木工程研究所
83
Damage detection of civil structures is a very important subject challenge the civil engineer. Reseaches and practic engineers enthusiastically work together to develop efficient and reliable methodology to conduct the detections to prevent disaster cause by structure failure. Curvature mode shape scheme was proposed by Pandey et al. in 1991. The basic idea is that when a structure experiences damage which causes the decrease in stiffness and then increse of the curvature that reflected in the following relationυ"=M/EI. In practice, we can measure the deflection of the structure and then calculate the curvature by difference scheme. Comparing the curvature mode shapes after and before damage ocurred, one can tell the position of damage if the ratio is larger than one. In this paper, Neural Nerwork is used to model the characteristics between the ratios of curvature mode shape and the damage extent,i.e. using the curvature mode shape of every measured point as the input vector and the damage extent as the output vector. Through the learning procedure, one can obtain a rather reliable model for prediction of damage locations and damage amounts. Finally, a simple bridge model is used for demonstration. Satisfied results are obtained and for complicated bridge structures more works are needed.
APA, Harvard, Vancouver, ISO, and other styles
9

Teng, Hao-Yuan, and 鄧皓元. "Using AR Model and Theory of Curvature Modal Shape to Study Damage Detection of Cantilever Beam." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/62435233079647025753.

Full text
Abstract:
碩士
國立臺灣大學
工程科學及海洋工程學研究所
102
Problems of damage detection in structural engineering are a major research topic. Beams have extensive applications in structures. For example, bridges and buildings are about that. The use of beam structure already exists in many safety testing methods. The development of structural system identification plays a good role in these fields in recent years. With the references of damage detection by structures modal parameters, its content are more about using finite element method to simulate damage detection. This thesis consider a way to detect the injury situation of cantilever structure through modal parameters obtained from system identification and the curvature modal shape theory. This thesis uses the Autoregressive model and the state-space system to identify modal parameters of cantilever beam structure and estimate its coefficient of Rayleigh damping. With the above steps, this thesis create finite element model to be similar to the actual cantilever beam. By generating responses of damaged and undamaged cantilever beams from a computer program, we can simulate the damage detection based on curvature modal shapes. The results showed that the proposed method for the variety injury situations has a good effect.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Curvature mode shape"

1

Caplovitz, Gideon Paul, Po-Jang Hsieh, Peter J. Kohler, and Katharine B. Porter. The Spinning Ellipse Speed Illusion. Oxford University Press, 2017. http://dx.doi.org/10.1093/acprof:oso/9780199794607.003.0013.

Full text
Abstract:
The Spinning Ellipse Speed Illusion is an illusion of perceived speed in which a low-aspect ratio “fat” ellipse will appear to rotate more slowly than a higher-aspect ratio “skinny” ellipse that is rotating at the same speed. This illusory percept can be observed when the ellipses are defined by luminance, color, relative motion, and dotted contours and across a wide range of rotational speeds and eccentricities. The illusion is not limited to rotating ellipses and can be observed with different-shaped contours as well. The Spinning Ellipse Speed Illusion illustrates that the perceived speed of a rotating object depends in part on the form and form features of the object. Objects without characteristic form features such as regions of high or discontinuous contour curvature will appear to rotate more slowly than objects that have these features.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Curvature mode shape"

1

Xu, Y. F., and W. D. Zhu. "Non-Model-Based Damage Identification of Plates Using Curvature Mode Shapes." In Conference Proceedings of the Society for Experimental Mechanics Series, 65–86. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29751-4_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kwon, Young W. "FSI Effect on Frequencies, Mode Shapes, and Modal Curvatures." In Springer Tracts in Mechanical Engineering, 59–84. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57638-7_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Elsaid, A., and R. Seracino. "Bridge Scour Assessment Using Curvature of Horizontally Displaced Mode Shapes." In Topics in Modal Analysis II, Volume 6, 305–11. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2419-2_30.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Özdemir, E., L. Kiesewetter, K. Antorveza, T. Cheng, S. Leder, D. Wood, and A. Menges. "Towards Self-shaping Metamaterial Shells:." In Proceedings of the 2021 DigitalFUTURES, 275–85. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_26.

Full text
Abstract:
AbstractDouble curvature enables elegant and material-efficient shell structures, but their construction typically relies on heavy machining, manual labor, and the additional use of material wasted as one-off formwork. Using a material’s intrinsic properties for self-shaping is an energy and resource-efficient solution to this problem. This research presents a fabrication approach for self-shaping double-curved shell structures combining the hygroscopic shape-changing and scalability of wood actuators with the tunability of 3D-printed metamaterial patterning. Using hybrid robotic fabrication, components are additively manufactured flat and self-shape to a pre-programmed configuration through drying. A computational design workflow including a lattice and shell-based finite element model was developed for the design of the metamaterial pattern, actuator layout, and shape prediction. The workflow was tested through physical prototypes at centimeter and meter scales. The results show an architectural scale proof of concept for self-shaping double-curved shell structures as a resource-efficient physical form generation method.
APA, Harvard, Vancouver, ISO, and other styles
5

Mouhamed, Mourad R., Mona M. Soliman, Ashraf A. Darwish, and Aboul Ella Hassanien. "Interest Points Detection of 3D Mesh Model Using K Means and Shape Curvature." In Advances in Intelligent Systems and Computing, 415–24. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99010-1_38.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Saha, S., T. Sohail, A. Bose, and J. S. Ali. "Damage Identification of Structures Using Limited Power Mode Shapes and Power Modal Curvature." In Lecture Notes in Mechanical Engineering, 257–73. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5693-7_18.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Polette, Arnaud, Jean Meunier, and Jean-Luc Mari. "“Shape-Curvature-Graph”: Towards a New Model of Representation for the Description of 3D Meshes." In Lecture Notes in Computer Science, 369–84. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60928-7_32.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Shevtsov, Sergey, Igor Zhilyaev, Paul Oganesyan, and Vladimir Akopyan. "A Probabilistic Approach to the Crack Identification in a Beam-like Structure Using Monitored Mode Shapes and Their Curvature Data with Uncertainty." In Applied Condition Monitoring, 447–61. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20463-5_34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Smarsly, Bernd, Matthijs Groenewolt, and Markus Antonietti. "SAXS analysis of mesoporous model materials: a validation of data evaluation techniques to characterize pore size, shape, surface area, and curvature of the interface." In Scattering Methods and the Properties of Polymer Materials, 105–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b107347.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

"2D curvature mode shape for damage detection." In Structural Health Monitoring and Integrity Management, 143–47. CRC Press, 2015. http://dx.doi.org/10.1201/b18510-45.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Curvature mode shape"

1

Yang, Mijia, and Hai Zhong. "Damage Detection for Plate-Like Structures Using Generalized Curvature Mode Shape Method." In 16th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481899.101.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Yue, Hong-Hao, Xiao-Ying Gao, Bing-Yin Ren, and Horn-Sen Tzou. "Spatial Exact Actuation of Flexible Deep Double-Curvature Shells." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34993.

Full text
Abstract:
Deep double-curvature shells are commonly used as key components in many advanced aerospace structures and mechanical systems, e.g., nozzles, injectors, horns, rocket fairings. Spatially distributed micro-actuation of a laminated flexible deep double curvature shell is investigated and its control effectiveness is evaluated in this study. Dynamic equations of the smart double curvature shell system are presented and modal control forces of spatial segmented piezoelectric actuators are carried out based on a new set of assumed mode shape functions with free boundary condition. Using these assumed mode shape functions, mode shapes of a free-floating deep shell are illustrated. Finally, via numerical simulation, control effectiveness of distributed actuator patches with respect to various natural modes, actuator locations and other factors which influence precision control and active actuation behavior of flexible deep double curvature shell structronic systems is evaluated.
APA, Harvard, Vancouver, ISO, and other styles
3

Fu, Xinghu, Siwen Wang, Shunyang Zhang, Qin Liu, Qifeng Li, Haiyang Xie, Guangwei Fu, Weihong Bi, and Yanjun Li. "A few mode fiber curvature sensor based on two spherical-shape structures modal interferometer." In International Symposium on Optoelectronic Technology and Application 2016. SPIE, 2016. http://dx.doi.org/10.1117/12.2247379.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

LI, BING, JIE ZHOU, KAN FENG, and ZHENG LI. "Damage Localization in Composite Lattice Truss Core Sandwich Structures Based on a Curvature Mode Shape." In Structural Health Monitoring 2015. Destech Publications, 2015. http://dx.doi.org/10.12783/shm2015/74.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Zhao, Shengjie, Nan Wu, and Yukun Cheng. "High Sensitivity Damage Detection With Vibration Mode Shape Tuning Through the Optimal Design of Piezoelectric Actuators." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51719.

Full text
Abstract:
This paper develops an advanced technique to significantly increase the frequency based damage detection sensitivity on a beam structure through a mode shape tuning process with the optimal design of the piezoelectric actuators. Piezoelectric sensors and actuators are mounted on the surface of the host beams to generate the feedback voltage and the active controlled excitations respectively. The excitations induced by the piezoelectric effect will be utilized to change the curvature distribution of the vibration mode shapes of the host beam structure so as to magnify the natural frequency difference between the intact beam and the damaged one to realize the high sensitivity damage detection. In this paper, theoretical models of the cantilever beams with and without mode shape tuning induced by piezoelectric layers are built first, while the damage is represented by a fixed end crack. Then, through the numerical simulations, the vibration mode shapes and corresponding natural frequencies of the beams can be solved to study the sensitivity improvement by using the proposed technique. In order to improve the detection efficiency, a couple of piezoelectric actuators are installed symmetrically on the upper and lower surface of the host beam, generating shifty bending moments to tune the vibration mode shapes. The actuation voltages applied on the actuators are determined by applying certain gain to the voltage from the piezoelectric sensors. Different gain factors are applied to the mode shape tuning process to reveal their effects on damage detection sensitivity improvement. As a result of the control process with proper gain factor, the curvature is more concentrated at the position close to the crack in the first vibration mode shape of the damaged beam comparing with the one without mode shape tuning. Therefore, the first natural frequency variation induced by the crack effect with mode shape tuning is much more significant than the one without mode shape tuning. In addition, further numerical simulations also indicate that the improvement of the detection sensitivity is closely related to the dimensions of the piezoelectric actuators. To realize better detection results, the optimal design of the size of the piezoelectric actuators is presented. The optimal length of the piezoelectric actuators is found leading to the best performance on damage detection. The theoretical studies and numerical simulations reflect that the proposed technique with mode shape tuning and optimally designed actuators is effective and promising in the field of damage detection. It is noted that the proposed technique can also be applied to improve the sensitivity of frequency based damage detection on other structures, e.g. plates and frames.
APA, Harvard, Vancouver, ISO, and other styles
6

Scott, William L., and Derek A. Paley. "Geometric Gait Design for a Starfish-Inspired Robot With Curvature-Controlled Soft Actuators." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5391.

Full text
Abstract:
This paper presents a geometric gait design and optimization framework for an idealized model of a planar starfish-inspired robot with curvature-controlled soft actuator arms. We describe the range of motion for each arm under the assumption of constant curvature along the length. Two modes of attachment of the ends of the arms to the ground are considered: fixed in position and orientation, and fixed in position but free to rotate. For each mode, we derive mathematical expressions for the local connection relating controlled shape changes to the displacement of the robot’s center. For the rotating case, we additionally model the individual arms as ideal elastica beams and design gaits based on expected buckling behavior for a special case of symmetric (mirrored) curvature inputs via numerical simulations.
APA, Harvard, Vancouver, ISO, and other styles
7

Govindasamy, Mahendran, Chandrasekaran Kesavan, and Malhotra Santkumar. "Damage Detection in Laminated Composite Plates and Shells Using Second Derivatives of Mode Shape Data Through Dynamic Analysis of These Structures." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51600.

Full text
Abstract:
The main objective of this study is to evaluate the dynamics-based techniques for damage detection in laminated composite cantilevered rectangular plates and cylindrical shells with damages in the form of surface macro-level cracks using finite element analysis (FEA). However, the quantitative change in global vibration characteristics is not sufficiently sensitive to local structural damages especially to small size damages. Hence certain parameters called damage indicators based on mode shape curvature, which are the second derivatives of the vibration characteristics (mode shapes), are used in this study to detect the location and size of even small damages accurately in laminated composite structures. The commercial FEA package ANSYS is used for the theoretical modal analysis to generate the natural frequencies and normalized mode shapes of the intact and damaged structures. Experimental investigations are carried out on the laminated plate and shell structural elements to provide a validation of the analysis. Experimental investigations are carried out on the laminated composite (E-glass unidirectional fibers reinforced epoxy resin) cantilevered plate and shell structural elements to provide a validation of the analysis. The effectiveness of these methods is clearly demonstrated by the results obtained.
APA, Harvard, Vancouver, ISO, and other styles
8

Smith, E. "The Mode III Elastic Stress Distribution in the Immediate Vicinity of an Inclusion." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71119.

Full text
Abstract:
As part of a wide ranging research programme aimed at developing a fracture mechanics methodology for blunt notches, earlier work for a general two-dimensional blunt notch Mode III model has shown that the stress at a distance × ≪ ρ (notch root radius of curvature) ahead of the notch root only depends on x, ρ and the peak stress σp, irrespective of the notch shape and the loading characteristics. This uniqueness has been confirmed for various notch profiles and loading scenarios. In this paper we show that the uniqueness of the local stress distribution is peculiar to a notch and does not apply to an inclusion.
APA, Harvard, Vancouver, ISO, and other styles
9

Reedlunn, Benjamin, Christopher Churchill, Emily Nelson, Samantha Daly, and John Shaw. "Bending of Superelastic Shape Memory Alloy Tubes." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4906.

Full text
Abstract:
Many shape memory alloy (SMA) applications exploit superelasticity in a bending mode, yet the large displacements and rotations associated with bending of slender structures make controlled experiments difficult. A custom pure bending fixture was built to perform experiments on superelastic NiTi tubes. To understand the bending results, the tubes were also characterized in uniaxial tension and compression, where a custom fixture was utilized to avoid buckling. In addition to measuring the global mechanical response, stereo digital image correlation (DIC) was used in all the experiments to capture the local surface displacement and strain fields. Consistent with the tension/compression data, our bending experiments showed a significant shift of the neutral axis towards the compression side. Also, the tube had strain localization on the tension side, but no such localization on the compression side. Detailed analysis of the strain distribution across the tube diameter revealed that the usual assumption of beam theory, that plane sections remain plane, did not hold along the tension side. Averaged over a few diameters of gage length, plane sections remain plane is a reasonable assumption and can be used to predict the global moment–curvature response. However, this assumption should be used with caution since it can under/over predict local strains by as much as 2× due to the localized deformation morphology.
APA, Harvard, Vancouver, ISO, and other styles
10

Smith, E. "The Mode III Elastic Stress Distribution Near the Root of a Deep Sharp Notch With a Parabolic Root Profile." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93057.

Full text
Abstract:
In developing a fracture initiation methodology for blunt notches, the basic starting point is the elastic stress distribution immediately ahead of a notch root. Earlier work for Mode III deformation of a two-dimensional blunt notch has shown that the shear stress immediately ahead of the notch root (i.e. at a distance small compared with the notch root radius of curvature) is dependent on the peak stress and notch root radius, but is independent of the notch shape and the loading characteristics. However there are many situations, i.e. with sharp notches, where we are interested in the stress at a distance that is not necessarily small compared with the notch root radius. Thus this paper shows that with a notch that has a parabolic root profile, when this distance and the notch root radius are both small compared with the notch depth, then the stress at this distance is again dependent on the peak stress and notch root radius, but is independent of the notch shape away from the root and the loading characteristics.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Curvature mode shape"

1

Pulov, Vladimir I., and Eddie J. Chakarov. Cylindrical Shapes of Helfrich Spontaneous-Curvature Model. Jgsp, 2014. http://dx.doi.org/10.7546/jgsp-36-2014-99-115.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Curvature mode shape' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography