| 2024-1 |
Yavuz, A., Sen, O. T. |
Development and performance assessment of different squeal index metrics based on experimental data. |
https://doi.org/10.1177/09544070241242827 |
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering |
The main objective of this study is to develop new squeal index formulations and assess their performances. Though, unlike the existing formulations, not only the measured data but also the operating and design parameters of the system of interest are also incorporated in the proposed formulations. |
| 2024-1 |
Yavuz, A., Sen, O. T. |
Application of piezoelectric shunt damping treatment for brake squeal suppression. |
https://doi.org/10.1063/5.0202313 |
In AIP Conference Proceedings (Vol. 3129, No. 1). AIP Publishing |
The main objective of this study is to assess the energy harvesting performance of a piezoelectric shunt damping treatment on the suppression of brake squeal noise. It is aimed to convert the mechanical vibrations generated during the propagation of brake squeal noise into electrical potential through the implementation of a piezoelectric element. The generated electric potential is then dissipated on a resistor that is connected in parallel to the piezoelectric element. |
| 2024-1 |
Yavuz, A., Hazar, A. N., Hacıbektaşoğlu, S. E. |
Vehicle noise pollution awareness for human health and environmental impacts: A comprehensive review. |
10.23893/1307-2080.APS6216 |
ACTA Pharmaceutica Sciencia, 62(2) |
This comprehensive review explores the extensive and intricate effects of vehicle noise on human health and provides insights into experimental studies using animal models, primarily rats, to understand the impact of low-frequency vehicle noise. Furthermore, the effects of factors such as engine type and size, vehicle speed, air conditions and traffic density on vehicle noise levels are reviewed. The adverse health consequences of vehicle noise include disruptions in sleep patterns, anxiety, mood disorders, cardiovascular risks, noise-induced hearing loss, and gastrointestinal problems. |
| 2024-1 |
Yavuz, A., Sen, O. T. |
Stability Analysis of a Mass-Sliding Belt System and Experimental Validation as Motivated by the Brake Squeal Problem |
10.1007/s42417-023-00849-0 |
Journal of Vibration Engineering & Technologies, 12(1), 395-414. |
The study investigates brake squeal in automotive disc brake systems and aims to understand how certain operational parameters affect squeal initiation. Both experimental and mathematical methods are used to analyze system stability. Experimentally, a mass-sliding belt setup focuses on three key operational parameters, while modal tests evaluate contact stiffness. A nonlinear mathematical model is developed and then linearized to assess system stability using complex eigenvalue solutions. |
| 2024-1 |
Aliihsan Koca, Oguzkan Senturk, Andaç Batur Çolak, Aykut Bacak, Ahmet Selim Dalkilic |
Artificial neural network-based cooling capacity estimation of various radiator configurations for power transformers operated in ONAN mode |
https://doi.org/10.1016/j.tsep.2024.102515 |
Thermal Science and Engineering Progress (SCI-Q1) |
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| 2024-1 |
Aliihsan Koca, Mehmet Nurettin Uğural, Ergün Yaman |
Rising Damp Treatment in Historical Buildings by Electro-Osmosis: A Case Study |
https://doi.org/10.3390/buildings14051460 |
Buildings (SCI-Q1) |
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| 2024-1 |
Andaç Batur Çolak, Aykut Bacak, Yakup Karakoyun, Aliihsan Koca, Ahmet Selim Dalkilic |
Improving pressure drop predictions for R134a evaporation in corrugated vertical tubes using a machine learning technique trained with the Levenberg–Marquardt method |
https://doi.org/10.1007/s10973-024-13082-y |
Journal of Thermal Analysis and Calorimetry (SCI-Q1) |
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| 2024-1 |
Aliihsan Koca, Oguzkan Senturk, Ömer Akbal, Hakan Özcan |
Techno-Economic Optimization of Radiator Configurations in Power Transformer Cooling |
https://doi.org/10.3390/designs8010015 |
Designs (Q2) |
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| 2024-1 |
Akin Arslan, Emrecan Soylemez |
Investigation of the Surface Roughness Effect on the Performance of an X-Band RF Filter Manufactured by Laser Powder Bed Fusion |
10.1109/TCPMT.2024.3360099 |
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This study evaluates the effects of design, manufacturing, and postprocessing of X-band RF filters manufactured with laser powder bed fusion (L-PBF) on the performance of RF microwave parts. Six filters were printed and results were compared to a reference filter manufactured by conventional methods to determine whether metal AM, with appropriate surface treatments and plating, can serve as an alternative for microwave components. The results of this study demonstrate that the RF filter produced by metal AM showed similar performance to the original filter after undergoing surface roughness improvements using the electrochemical method, Hirtisation, resulting in an average of 50% improvement in roughness compared to raw production and the silver-plating application. |
| 2024-1 |
Birol Ozcevik, Emrecan Soylemez, Bekir Bediz, Ugur Simsek |
Effects of particle damper design parameters on the damping performance of laser powder bed fused structures |
https://doi.org/10.1007/s00170-023-12901-0 |
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In this study, we examined 16 cases of integrated PDs by varying specific parameters including size, number, and locations on the structure to understand the effects of these parameters on the dynamic behavior of the first and second modes of the structure. Modal tests were conducted on additively manufactured samples to extract frequency response functions and calculate modal parameters (natural frequency and damping ratio) using the rational fraction polynomial method, studying the effects of PDs. |
| 2024-1 |
Emrecan Soylemez, Recep Onler, Tugce Ozturk |
Füzyon Temelli Eklemeli İmalat Süreç Modellemesi |
ISBN:978-625-427-864-8 |
Tasarım Felsefesini Değiştiren Yeni Bir İmalat Anlayışı: Eklemeli İmalat |
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| 2024-1 |
Atakan Altınkaynak, Emrecan Soylemez |
Malzeme Ekstrüzyon Süreci Modellemesi |
ISBN:978-625-427-864-8 |
Tasarım Felsefesini Değiştiren Yeni Bir İmalat Anlayışı: Eklemeli İmalat |
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| 2024-1 |
Moral, K., Ayran, B. & Altug, E. |
Design and control of a modular multi-drone system with vertical assemble capability |
https://doi.org/10.1007/s40435-024-01404-9 |
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A unmanned aerial vehicle (UAV) has limited payload capacity based on its design. This paper introduces a stackable UAV that can be assembled vertically. This, for example, can enable multiple UAVs to come together to carry a larger load. Firstly, a docking mechanism has been designed to dock multiple UAV modules into a UAV structure. Then, mathematical modeling of the UAV module and the UAV structure for the proposed system have been built. The second goal of this paper is to propose a novel PD controller gain calculation method. The purpose was not to retune the controller each time as the UAV number changes. As each UAV module is already tuned, this paper proposes a PD controller method in which the structure’s control gains are calculated by the number of UAV modules and the parameters of each module. Simulation and stability analysis of the proposed controller and experiments with manufactured UAVs have shown the benefits and performance of the UAV structure, as its performance has been compared with a single UAV module. Moreover, unlike previous work in the literature, the payload performance of a vertical-assembled UAV structure has been examined. |
| 2024-1 |
Orhan Veli Kazancı Yakup Erhan Böke |
Validation of Bluff-body Swirling Flame with RANS Turbulent Model and Comparison of the Results with LES Turbulent Model |
10.5541/ijot.1380710 |
International Journal of Thermodynamics (IJoT) |
The energy required for technological advancement is primarily derived from hydrocarbon combustion, which is a key topic in thermodynamics. The stability of the flame in hydrocarbon combustion is a critical parameter that impacts both burner design and combustion efficiency. Various methods have been employed in the literature to achieve a stable flame, with swirl flow being one technique that enhances combustion performance in engineering applications. This study focuses on the numerical analysis of the SM1 flame from Sydney swirl flames. Initially, the flow incorporating the two-equation Re-Normalization Group (RNG) k-ε and Shear Stress Transport (SST) k-ω turbulence models, along with the chemical reactions of CH4 combustion using the GRI 3.0 reaction mechanism, was modeled and compared with experimental data. Subsequently, the numerical results obtained from the Shear Stress Transport k-ω turbulence model, which demonstrated the best agreement with experimental data, were compared with results from a numerical analysis in the literature using the Large Eddy Simulation (LES) turbulence model. The predictive capabilities of these two turbulence models, along with their behavior in the flow region, were evaluated. The comparison revealed that for stable flames within the Sydney swirl flame family, the Shear Stress Transport k-ω turbulence model, which provides results in a more efficient manner, is sufficient compared to the computationally expensive Large Eddy Simulation turbulence model. This choice is made possible by utilizing a solution algorithm tailored to the flow characteristics and appropriate boundary conditions. |
| 2024-1 |
Prof. Dr. Lütfullah Kuddusi |
MİKROKANALLAR AKIŞ VE ISI GEÇİŞİ |
NaN |
İTÜ Yayınevi |
Bu kitap, İTÜ Lisansüstü Eğitim Enstitüsü Makina Mühendisliği programında verdiğim “Micro Scale Heat Transfer” dersinin notlarından oluşmuştur. Kitapta küçük ölçekli kanallarda akış ve ısı geçişi problemi ele alınmıştır. Bunun için ilk olarak uzunluk ölçü birimlerinden, göreceli küçük ve büyük olanlardan, nanometre, mikrometre, milimetre, kilometre, megametre, gigametre gibi, bahsedilmiştir. Ardından, temel kuramlar verilmiş ve değişik faz durumunda ve değişik akış türünde çeşitli mikrokanal geometrileri ele alınarak akış ve ısı geçişinin matematik modeli ifade edilmiştir. Doğal olarak, bütün mühendislik problemlerinde olduğu gibi matematik modelin çözümü mikrokanallarda analitik veya sayısal çözümlemenin gereğidir. Günümüz dünyasında elektrokinetik akış çok gündemdedir, mühendislikten tutup tıbba kadar kullanım sahası vardır. Bu durumu dikkate alarak, bir mühendise yeterli olacak kadar elektrokinetik akışın fiziğinden kısaca bahsedilmiş ve elektroozmotik akışla ilgili iki mikrokanal örneği verilerek matematik modeli çıkarılmıştır. Kitabın okunmasının ön şartı matematik, termodinamik, ısı geçişi ve akışkanlar mekaniği bilgisine sahip olmaktır. Bu gerçekten yola çıkarak kitap, yüksek lisans ve doktora öğrencilerine hitaben kaleme alınmış, bu kesimi doğrudan ilgilendirir. Lisans öğrencileri de bilgilerini artırmak için kitabın bazı bölümlerini rahatlıkla okuyabilirler. Ayrıca, sanayide çalışanlar, özel olarak soğutma, beyaz eşya, tıbbı tanı, DNA taraması, kimya, biyo ölçüm, ayırma, karıştırma, dağıtma ve ısıl çevrim gibi sektörlerdeki mühendislerin yaralanabileceği bir kitaptır. Bir ulusu ulus yapan en önemli öğelerin başında “dil” gelir. Dil canlı bir varlıktır. Dilde yeni sözcüklerin türetilmesi ve yaygınlaştırılması dile can kazandırır. Bu bağlamda, Türkçe olarak yazılmış bu kitabın Türkçe teknik sözcüklerinin yaygınlaştırılmasına sebep olacağından Türkçe yazınına bir katkı niteliği taşımaktadır. Ne yazık ki, ülkemizin ve üniversitemizin resmi dilinin Türkçe olmasına rağmen, İngilizce yazılan kitap Türkçe yazılanın iki katı değer görmektedir. Bu garabetin bir an evvel giderilmesini ümit ederim. |
| 2024-1 |
Merve Acer Kalafat, Hasan Sevinç, Shahrad Samankan |
Design of a foldable origami-inspired 6-DoF Stewart mechanism |
10.1007/s12206-024-0235-5 |
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This work presents a novel, foldable, miniature Stewart parallel mechanism with 6 DoF, which has a complex structure even for conventional methods using rigid parts. The developed mechanism is monolithic, having designed unique flexible joints. When folded, it has a 16 cm diameter circular footprint that works effectively in a 20×20×20 mm3 workspace. Inside this volume, the X and Y-axis rotational ranges are ±10° and the Z-axis rotational range is ±7.5°. |
| 2024-1 |
Dila Türkmen, Merve Acer Kalafat |
Proportional control of a parallel robogami delta mechanism with embedded 2D printed angle sensor feedback |
10.1177/095440622412283 |
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We implement silver inkjet printed angle sensors for the first time into a robogami structure and use this class of sensors for control. For the first time, a parallel manipulator is controlled with a 2D sensor, and printed sensors are tested for continuous control. Performances are analyzed with set-point and tracking control tasks using a paper Delta mechanism, compared with on-off control and encoder feedback control cases for better evaluation. A detailed comparison with the existing studies both for robogami parallel mechanisms and other sensor-embedded flexible hinges is provided. Encoder-like control performances are achieved in a wide range of the joint space and down to ~1 mm. RMS task space accuracy is recorded. Sources and potential improvements for the less accurate regions are stated. We conclude that printed sensors are promising for parallel mechanisms and continuous signal control applications. |
| 2024-1 |
Rasid Ahmed Yildiz, Andrei-Alexandru Popa, Mohammad Malekan |
On the effect of small laser spot size on the mechanical behaviour of 316L stainless steel fabricated by L-PBF additive manufacturing |
https://doi.org/10.1016/j.mtcomm.2024.108168 |
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| 2024-1 |
İsmail Kaya, Cemal Baykara |
The investigation of the effect of operating condition in gearboxes on efficiency |
10.1177/16878132241248072 |
Advances in Mechanical Engineering |
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| 2024-2 |
Mithat Can Özin, Bilsay Sümer, İlker Murat Koç |
Theoretical modeling and error analysis of a compliant Y-shaped mechanism including beam joint stiffness and stress topology for size optimization of six-axis force/moment sensors |
https://doi.org/10.1007/s40430-024-05099-z |
Journal of the Brazilian Society of Mechanical Sciences and Engineering |
The novel compliant Y-shaped mechanisms have mechanical advantages for the multi-axis force/moment sensor since they yield more elastic deformation and more voltage output for strain gauge measurements compared to their common alternative cross-beam structures. This study includes stress topology and natural frequency approximations of the y-shaped structure by taking into account elastic beams and the stiffness of the beam connections. |
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| 2024-2 |
Mithat Can Özin, Bilsay Sümer, İlker Murat Koç |
Approximate Modeling of Cross-Beam Multi-Axis Force/Moment Sensor through Gaussian Process and Partial Dependence Plots For Design Optimization Including Stress Topology |
https://doi.org/10.1080/15397734.2024.2382841 |
Mechanics Based Design of Structures and Machines |
This study introduces a novel approximate model (AM) aimed at optimizing the design of cross-beam multi-axis force/moment sensor. It considers the characteristics of flexure hinges in elastic beams and the flexibility of beam joints, resulting in improved accuracy and broader solutions for equivalent stresses and natural frequencies compared to existing approximate models in the literature. |
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