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1دورية أكاديمية
المؤلفون: TOMAR, Shruti, CHADHA, Naresh M.
المصدر: Volume: 5, Issue: 4 286-292 ; 2687-4539 ; Chaos Theory and Applications
مصطلحات موضوعية: GDFKdV Equation, Nonlinear Dynamics, Chaos, Wave Propagation, Lyapunov Exponent, Phase Portraits, Numerical Modelling and Mechanical Characterisation, Sayısal Modelleme ve Mekanik Karakterizasyon
الوصف: In this article, we consider the Generalized Damped Forced Korteweg-de Vries (GDFKdV) equation. The forcing term considered is of the form $F(U)=U(U-v_1)(U-v_2)$, where $v_1$ and $v_2$ are free parameters. We investigate the behaviour of fixed points evaluated for the corresponding dynamical system of our model problem. With respect to these fixed points, we investigate the effects of a few significant parameters involved in the model, namely, the free parameters $v_1$ and $v_2$, the nonlinear, dispersion and damping coefficients using the tools from bifurcation analysis. We also obtain the wave plots for the critical values of the nonlinear and dispersion coefficients for which the system becomes unstable and exhibit chaotic behaviour. We confirm the chaos in our dynamical system under various conditions with the help of Lyapunov exponents.
وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/3234725Test; https://dergipark.org.tr/tr/pub/chaos/issue/81404/1320430Test
الإتاحة: https://doi.org/10.51537/chaos.1320430Test
https://dergipark.org.tr/tr/pub/chaos/issue/81404/1320430Test -
2دورية أكاديمية
المؤلفون: MEHDİ, Fikret, DOĞANGÜN, Adem, FAHJAN, Yasin
المصدر: Volume: 27, Issue: 2 731-748 ; 2148-4147 ; 2148-4155 ; Uludağ University Journal of The Faculty of Engineering ; Uludağ Üniversitesi Mühendislik Fakültesi Dergisi
مصطلحات موضوعية: Wave propagation, compression wave, shear wave, earthquake wave, high rise buildings, and numerical analysis., Dalga yayılımı, basınç dalgası, kayma dalgası, deprem dalgası, yüksek yapılar, sayısal modelleme., İnşaat Mühendisliği, Civil Engineering
الوصف: This paper numerically investigates the impact of considering the seismic wave propagation phenomenon on the dynamic response of high-rise buildings. A core wall and a frame are analyzed under seismic loading considering wave propagation phenomenon and ignoring it. The bending moment, shear force, axial force, and inter-story drift for both analyzed systems are evaluated. The amplitude Fourier response spectra for the dynamic response at different stories are discussed as well. Forty-six stories each, both systems are subjected to transverse and longitudinal seismic waves at the fixed base. The results show that considering the wave propagation phenomenon yields a slight decrease in the inter-story drift, shear force, and bending moment. It is found that considering wave propagation phenomenon increases the axial force significantly, especially for the core wall at the floors of the top third part. It is worth pointing out that high-rise buildings cannot be categorized, and every single different detail can trigger a different response. Thus, the main contribution of this paper is to highlight the drastic need to consider wave propagation phenomenon in such "out of code" buildings. The more important is a need to upgrade the standard analysis and design engineering packages to accurately capture the essential physics of the wave propagation phenomenon and perform the analysis precisely. ; Bu çalışmanın amacı, sismik dalga yayılımı olgusunu dikkate almanın yüksek binaların dinamik tepkisi üzerindeki etkisini sayısal olarak araştırmaktır. Bir çekirdek duvar ve bir çerçeve, dalga yayılımı olgusu göz önünde bulundurularak ve göz ardı edilerek sismik yükleme altında analiz edilmiştir. Analiz edilen her iki sistem için eğilme momenti, kesme kuvveti, eksenel kuvvet ve katlar arası ötelenme değerlendirilmiştir. Farklı katlardaki dinamik tepki için genlik Fourier tepki spektrumları da tartışılmıştır. Her biri kırk altı katlı, her iki sistem de sabit tabanda enine ve boyuna sismik dalgalara maruz ...
وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/2168431Test; https://dergipark.org.tr/tr/pub/uumfd/issue/71647/1051617Test
الإتاحة: https://doi.org/10.17482/uumfd.1051617Test
https://dergipark.org.tr/tr/pub/uumfd/issue/71647/1051617Test -
3دورية أكاديمية
المؤلفون: HACINLIYAN, İrma
المصدر: Volume: 17, Issue: 1 170-184 ; 1306-7575 ; Süleyman Demirel Üniversitesi Fen Edebiyat Fakültesi Fen Dergisi
مصطلحات موضوعية: Doğrusal Olmayan Schrödinger Denklemleri,Doğrusal Olmayan Dalga Yayılımı,Genelleştirilmiş Elastik Ortam, Nonlinear Schrödinger Equations,Nonlinear Wave Propagation,Generalized Elastic Medium
الوصف: Bu çalışmada, genelleştirilmiş, kübik doğrusal olmayan elastik bir ortamda yayılan boyuna bir dalgada, yüksek mertebeden dağılım ve doğrusal olmayan etkilerin katkılarını incelemek için beşli-yedili doğrusal olmayan modülasyonu düşünülmektedir. Son zamandaki çalışmalarda, hemen hemen tek dalga sayılı dalga çözümlerinin çok ölçekli açılımı kullanılarak boyuna bir dalganın modülasyonu için üçüncü mertebeden dispersiyon terimli kübik, doğrusal olmayan Schrödinger denklemi elde edildi. Elde edilen denklemde bazı doğrusal olmayan terimlerin katsayılarının yer almadığı belirli bir malzeme sabiti ve dalga sayısı değerleri seçilirse, boyuna bir dalganın davranışını tanımlamak için, doğrusal olmayan etkileri dağılım etkilerle dengelendiği yeni bir pertürbasyon açılımına ihtiyaç vardır. Sonuç olarak, üçüncü dereceden dağılım terimli beşli-yedili doğrusal olmayan Schrödinger denklemi, beşli-yedili doğrusal olmayan etkinin üçüncü mertebeden dağılım terimiyle dengelendiği yeni bir model olarak elde edilir. ; In the present study, the quintic-septic nonlinear modulation of a longitudinal wave propagating to contribute the dispersive and higher-order nonlinear effects in a generalized cubically nonlinear elastic medium is considered. In recent work, for the modulation of a longitudinal wave, a cubic nonlinear Schrödinger equation with a third-order dispersive term is obtained by using a multi-scale expansion of quasi-monochromatic wave solutions. The third- quintic-septic longitudinal wave, by choosing specific values of material constants and wave number for which some coefficients of nonlinear terms are disappeared. In this case, a new perturbation expansion is needed to balance nonlinear effects with dispersive effects. As a result, a quintic-septic nonlinear Schrödinger equation with a third-order dispersion term is obtained as a new model that balances quintic-septic nonlinearity with a third-order dispersion term.
وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/2070578Test; https://dergipark.org.tr/tr/pub/sdufeffd/issue/70018/1020858Test
الإتاحة: https://doi.org/10.29233/sdufeffd.1020858Test
https://dergipark.org.tr/tr/pub/sdufeffd/issue/70018/1020858Test -
4دورية أكاديمية
المؤلفون: ALTAY ARPALİ, Serap
المصدر: Volume: 7, Issue: 2 36-39 ; 2149-3596 ; Mugla Journal of Science and Technology
مصطلحات موضوعية: Optical spherical wave propagation,Bit error rate,Biological tissues,Tissue turbulence
الوصف: In this study, bit error rate (BER) of optical spherical wave is investigated to analyze the performance of spherical wave through in soft tissue. Within this scope, average BERs (
) of optical spherical wave are extensively examined depends on the different tissue and turbulence parameters that are random changes in the refractive index of the soft tissue, the tissue length from source to receiver, and the outer scale of the tissue turbulence. It is observed from the outputs that the ( ) increases with increasing value of outer scales, tissue lengths and random changes in the refractive index of the soft tissue. Also we investigated ( ) values of the optical spherical wave for the different values of the one half of the quantified slope in the range of power-law scaling. It is found that smaller s of the spherical wave are obtained for decreasing values of one half of the quantified slope in the range of power-law scaling. وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/1803989Test; https://dergipark.org.tr/tr/pub/muglajsci/issue/65497/947190Test
الإتاحة: https://doi.org/10.22531/muglajsci.947190Test
https://dergipark.org.tr/tr/pub/muglajsci/issue/65497/947190Test -
5دورية أكاديمية
المؤلفون: SEVİNÇ, Emrah, GÜNEY, Mehmet Şükrü
المصدر: Volume: 23, Issue: 69 803-821 ; 1302-9304 ; 2547-958X ; Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi
مصطلحات موضوعية: Distorted physical model,Sudden dam break,Vegetation effect,Flood wave propagation, Çarpıtılmış fiziksel model,Ani baraj yıkılması,Bitki örtüsü etkisi,Taşkın dalgası yayılması
الوصف: The purpose of this study is to investigate the effect of partial vegetation on the wave propagation resulted from sudden dam failure in a residential area. Temporal variations of water depths and flood wave propagation velocities were determined and compared with those obtained from the experiments performed without vegetation. The experiments were performed on the distorted physical model of Urkmez Dam and its downstream region. The distorted physical model with horizontal scale of 1/150 and vertical scale of 1/30 contains the dam reservoir, the dam body, the residential area of Urkmez coastal town until the sea and the partial vegetation. In the model, the reservoir has an active volume of 11.222 m3, the dam body has a length of 2.84 m and a height of 1.07 m, and the downstream area is nearly 200 m2. Water depths were measured by e+ WATER L level sensors placed at various locations of the downstream region. Velocities were measured by ultrasonic velocity profilers (UVP) located near the level sensors. Flood wave propagation was recorded by the high definition digital camera. Experimental findings obtained from the physical model were converted to the prototype values, in nature. The changes in water depths and elapsed times, also the changes in velocities and their occurrence times were determined for different zones of the downstream area in the presence of vegetation. The experimental results revealed that in such a dam failure, the flood arrives at the sea in 6 s in the absence of vegetation, while in 10 s in the presence of vegetation. These values correspond to 2.74 min and 4.57 min, respectively in the prototype. The existence of vegetation resulted in decrease in flood propagation velocities mainly in the dense residential area, as expected. It was observed that the maximum water depths were increased at the left bank and decreased at the right bank, except at level sensor S6 which is very close to the creek. It was observed that the maximum depth averaged velocities were decreased in the sparse and ...
وصف الملف: application/pdf
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6دورية أكاديمية
المؤلفون: BASMACI, Ayşe Nihan, FİLİZ, Seçkin
المصدر: Issue: 26 223-227 ; 2148-2683 ; Avrupa Bilim ve Teknoloji Dergisi
مصطلحات موضوعية: Electromagnetic wave propagation,Photonic crystals,Maxwell equations,Finite differences method., Elektromanyetik dalga yayılımı,Fotonik kristaller,Maxwell denklemleri,Sonlu farklar yöntemi.
الوصف: In this study, frequencies of electromagnetic wave propagation in two-dimensional photonic crystal structures are investigated. For this purpose, the electromagnetic wave propagation equation obtained by using Maxwell equations is solved with the finite differences method. The fundamental frequencies of electromagnetic wave propagation have been obtained with a low error rate of 3.10%. ; Bu çalışmada, iki boyutlu fotonik kristal yapılarda elektromanyetik dalga yayılımı frekansları incelenmektedir. Bu amaçla, Maxwell denklemleri kullanılarak elde edilen elektromanyetik dalga yayılımı denklemi sonlu farklar yöntemi ile çözülmektedir. Elektromanyetik dalga yayılımı temel frekansları %3,10 gibi düşük bir hata oranıyla elde edilmiştir.
وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/1824118Test; https://dergipark.org.tr/tr/pub/ejosat/issue/62946/952419Test
الإتاحة: https://doi.org/10.31590/ejosat.952419Test
https://dergipark.org.tr/tr/pub/ejosat/issue/62946/952419Test -
7دورية أكاديمية
المؤلفون: ÖZSOY ÖZBAY, Ayşe Elif, GÜNDEŞ BAKIR, Pelin
المصدر: Volume: 27, Issue: 3 290-302 ; 1300-7009 ; 2147-5881 ; Pamukkale Üniversitesi Mühendislik Bilimleri Dergisi
مصطلحات موضوعية: Soil-Structure interaction,Finite elements method,Seismic wave propagation, Yapı-Zemin etkileşimi,Sonlu elemanlar yöntemi,Deprem dalgası hareketi
الوصف: The interaction of soil and structure significantly alters displacement response of the framed structures. This effect is mostly important for the buildings resting on soft soils. Including these effects in the dynamic analysis, the lateral displacements and the drift demand of the building increase depending on the type of the underlying soil. The variation in the drift demand due to the interaction effects also changes the performance level of the structure, as well. Since the interstory drift ratio is one of the most important demand parameter, it is essential to integrate the effects of soil structure interaction within the structural design process and the performance assessment. In this study, the drift demand of an existing multistory building is obtained using an improved technique for dynamic analysis of the soil-structure systems. The technique is based on the analysis of the multistory buildings under the seismic wave propagation employing Finite Element Methods (FE) for the superstructure and Boundary Element Methods (BE) for the underlying soil medium. The lateral displacement response at each story level is used to determine maximum interstory drift ratio of the building and to estimate structural performance level. ; Yapı-zemin etkileşimi, çerçeve sistemli yapıların deprem yükü altındaki yerdeğiştirme cevabını önemli ölçüde değiştirmektedir. Bu etki özellikle yumuşak zemin üzerine inşaa edilmiş yapılarda çok daha önemlidir. Dinamik çözümlemede bu etki göz önüne alındığı takdirde; yapının inşaa edildiği zemin türüne bağlı olarak yanal yerdeğiştirmelerinde ve kat ötelemesi talebinde artış meydana gelebilir. Etkileşime bağlı olarak yapının kat ötelemesi talebinde meydana gelen farklılık, aynı zamanda yapının performans seviyesini de değiştirir. Göreli kat ötelemesi oranı, deprem etkisi altında tasarım sürecindeki en önemli yapısal parametrelerden birisidir. Bu sebeple, yapı-zemin etkileşimi etkilerinin yapısal tasarım aşamasında ve performansın belirlenmesinde dikkate alınması oldukça önemlidir. Bu ...
وصف الملف: application/pdf
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8دورية أكاديمية
المؤلفون: ÇAKIL, Turan, CARLAK, Hamza, ÖZEN, Şükrü
المصدر: Volume: 8, Issue: 3 844-855 ; 1308-6693 ; Mühendislik Bilimleri ve Tasarım Dergisi
مصطلحات موضوعية: FDTD,Akustik dalga analizi,Akustik dalga maruziyeti,Akustik dalgalarda basınç değişimi,Tek boyutlu gauss modeli, FDTD,Acoustic wave analysis,Acoustic wave propagation,Pressure changes in the acoustic wave,One-dimensional Gaussian model
الوصف: Bu çalışmada ses dalgalarının farklı ortam yüzeylerinde meydana getirdiği basınç ve hız değişimleri ele alınmıştır. Ultrason dalgalarına benzerliği nedeniyle çalışmada ses dalgaları kullanılmıştır. Dalga modeli olarak, gauss nabız dalga modeli kullanılmıştır. Ortam yüzeyleri olarak hava, su, metal, s-oil, polietilen gibi cansız yüzeyler, doku türleri da olarak bağ doku ve kas dokusu yüzeyleri analizlerde kullanılmıştır. Seçilen bu ortam yüzeylerinde, akustik dalgalarının oluşturduğu basınç etkileri, zamanda sonlu farklar (FDTD) metodu kullanılarak incelenmiştir. Örneklenen gauss ses dalgasının analizinde, iterasyon sayısı arttıkça yayılım değeri de artmaktadır. Polietilen yapılı katmanlarda ise sesin oluşturduğu basıncın etkisinin düşük olduğu (Pplastik=39,5 µPa ve Vplastik=13,17 µm/sn ) tespit edilmiştir. Canlı dokulardan bağ dokusu ve kas dokusu üzerinde yapılan incelemede ise bir ses dalgasının bu iki doku üzerinde benzer basınç (Pbağ=1,295 Pa, Pkas=1,282 Pa) ve hız (Vbağ=0,63 µm/sn, Vkas= 0,58 µm/sn) değerleri oluşturduğu gözlenmektedir. ; In this article, the changes of pressure and speed on the various media surfaces, created by the sound waves are studied. Sound waves are used in the study due to their similarity to ultrasound waves. As the wave model, the Gaussian pulse wave pattern has been preferred. While inanimate surfaces such as air, water, metal, s-oil, polyethylene are used as ambient surfaces, and muscle and connective tissue surfaces are used as the living tissue in analyses. The pressure effects of acoustic waves on the selected media surfaces are investigated using the finite difference time domain (FDTD) method. In the study of the Gaussian sound wave, the propagation value increases as the number of iterations rises. In polyethylene layers, the effect of the pressure created by the sound is low (Pplastic = 39,5 µPa and Vplastic = 13,17 µm / sec). The study implemented on living tissues as a connective and muscle tissue depicts that a sound wave creates similar pressure (Pconnective =1,295 ...
وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/1093326Test; https://dergipark.org.tr/tr/pub/jesd/issue/56892/734108Test
الإتاحة: https://doi.org/10.21923/jesd.734108Test
https://dergipark.org.tr/tr/pub/jesd/issue/56892/734108Test -
9دورية أكاديمية
المؤلفون: KHALID, Khaırul Nadıah, ROHANI, Muhammad Nur Khaırul Hafızı, ISMAIL, Baharuddın, ISA, Muzamır, CHAI, Chang Yıı, MUHAMMAD, Wan Nurul Aunı Wan
المصدر: Volume: 28, Issue: 3 1303-1313 ; 1300-0632 ; 1303-6203 ; Turkish Journal of Electrical Engineering and Computer Science
الوصف: Partial discharge PD is an abnormal activity that occurs in high-voltage components, such as power cables, switchgear, machines, and power transformers. Such activity needs to be diagnosed for the equipment to last longer as PD could harm the insulation and potentially lead to asset destruction from time to time. Moving one or more externally mounted acoustic sensors to different locations on the transformer tank is commonly used in order to detect and locate PD signal occurring in the power transformer. However, this procedure may lead to less accuracy in PD identification. Therefore, this research paper presents an analysis of acoustic sensor placement based on time of arrival TOA technique for PD location in a power transformer. The detection and location can be determined by permanently installing the acoustic sensor to provide valuable data in an early stage of occurrence for online condition PD monitoring. Several methods are available for the detection of PD signal, whereby one of the best choices is via acoustic emission AE . PD creates an ultrasonic signal used for PD detection. This paper proposes the possible placement of AE sensors to be mounted on the power transformer wall based on ideal and static PD signals. The sensors were placed in order to capture the PD signal without any disturbance signal from inside or outside the tank. The time for the signal for the first approach for each sensor is recorded to estimate the PD location using the TOA technique. A comparison between the least square method LSM and Gauss--Jordan elimination GJE for the TOA technique was analyzed to differentiate the resulting performance. This research utilized three different PD sources to apply the performance analysis on PD locations, while five cases were proposed to represent the five different placements of four sensors for the analysis. This research ultimately suggests that sensors be placed and randomly mounted on the four sides of the transformer tank, with one sensor allocated to one side. Among all five cases, ...
وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/1110701Test; https://dergipark.org.tr/tr/pub/tbtkelektrik/issue/54388/739695Test
الإتاحة: https://doi.org/10.3906/elk-1907-187Test
https://dergipark.org.tr/tr/pub/tbtkelektrik/issue/54388/739695Test -
10دورية أكاديمية
المؤلفون: TOKMAK, Yavuz
المصدر: Volume: 4, Issue: 3 136-142 ; 2149-0104 ; 2149-5262 ; International Journal of Engineering Technologies IJET
مصطلحات موضوعية: water wave propagation,radial basis function collocation,numerical modelling,Navier-Stokes equations,Laplace Equation
الوصف: In this study, two different numerical models are developed using the radial basis function collocation method (RBFCM) for the waves propagating over variable bathymetry. For the verification and validation of the models, submerged breakwater test, present in the literature, is used. One of the models is based on the Navier-Stokes equations where the fluid is assumed to be viscous, incompressible and is of constant density. Also, it is assumed that the flow is unsteady and the turbulent effects are neglected. And for the other model, it is assumed that the fluid is inviscid, incompressible and is of constant density while the flow is assumed to be unsteady and irrotational. On the surface, fully nonlinear forms of the free surface boundary conditions are implemented using the semi-Lagrangian approach. Multiquadric radial basis functions (MQRBF) are used for the approximation of the unknown parameters. Since each of the models requires the solution of an elliptic boundary value problem, extra collocation centers are defined outside the problem domain in the neighborhood of the boundary centers to define both the boundary condition and the governing equation at a boundary center for better accuracy and stability. It is observed that the results of the both models are in agreement with the laboratory test results.
وصف الملف: application/pdf
العلاقة: https://dergipark.org.tr/tr/download/article-file/657624Test; https://dergipark.org.tr/tr/pub/ijet/issue/43409/447458Test
الإتاحة: https://doi.org/10.19072/ijet.447458Test
https://dergipark.org.tr/tr/pub/ijet/issue/43409/447458Test
