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检索条件"丛书名=Lecture Notes in Mechanical Engineering"

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Modifications of Alkaline-Earth Fluorides Using Slow Highly Charged Ions

Modifications of Alkaline-Earth Fluorides Using Slow Highly ...

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Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： El-Said, Ayman Sherif King Fahd Univ Petr & Minerals Phys Dept Dhahran 31261 Saudi Arabia King Fahd Univ Petr & Minerals Interdisciplinary Res Ctr Adv Mat Dhahran 31261 Saudi Arabia

ISBN: (纸本)9783031643613;9783031643620

The irradiation with highly energetic (MeV-GeV) heavy ions can lead to the modifications of the properties of different materials. Among the observed effects, the creation of surface nanostructures in different materials were demonstrated. Recently, slow (eV-keV) highly charged ions (HCIs) were successfully utilized for the creation of similar surface nanostructures in various solids. However, HCI exhibits unique features by altering only the top surface layers without modifying the deeper layers, which cannot be avoided for MeV-GeV heavy ions. Based on both the type of the material and ion beam parameters (charge state, kinetic energy, potential energy, etc.), nanostructures of different shapes (pits, caldera-like, hillocks) and sizes were obtained.

关键词： Highly charged ions nanostructures surface modifications

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Influence of Vibration Isolator Stiffness on the Dynamic Performance of a Steel-Floating Slab Track 15th

Influence of Vibration Isolator Stiffness on the Dynamic Per...

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15th International Conference on Vibration Problems (ICoVP)

作者： Bashir, Shamsul Mandhaniya, Pranjal Akhtar, Nasim Acad Sci & Innovat Res AcSIR Ghaziabad 201002 India CSIR Cent Rd Res Inst New Delhi 110025 India Indian Inst Technol Delhi Dept Civil Engn Delhi 110016 India

ISBN: (纸本)9789819959211;9789819959228

The floating slab track (FST) is the most efficient structure for mitigating the vibrations caused by underground railway systems. The analytical model for the steel-floating slab track system (SFST) was developed using a conventional mathematical approach based on influence lines to calculate the deflections, vibration attenuation, and stresses. The developed system was validated through the fatigue verification test. The effect of the decrease in stiffness of the steel-spring isolator (SSI) on the dynamic performance of the slab track was analyzed and compared. It was found that the vibration attenuation efficiency of the system increases significantly as the stiffness of the SSI decreases. However, lowering the stiffness of the isolator increases the dynamic deflections and hence results in higher stresses causing the fatigue failure of the system. Although implementing the SFST with lower stiffness decreases the natural frequency, it may raise concerns regarding slab track damage. Therefore, it is necessary to evaluate the reasonable stiffness of the SSI to achieve satisfactory vibration attenuation as well as the safe design of the slab track system.

关键词： Steel-spring isolator Floating slab track Stiffness Vibration attenuation Deflection Fatigue failure

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GPU Accelerated Simulation of Conjugate Heat Transfer Problems 14th

GPU Accelerated Simulation of Conjugate Heat Transfer Proble...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Borges da Silva Reis, Cesar Augusto Botezelli, Daniel Magalhaes, Elisan dos Santos Neto, Aristeu da Silveira Aeronaut Inst Technol BR-12228900 Sao Jose Dos Campos SP Brazil Fed Univ Uberlandia UFU BR-38410337 Uberlandia MG Brazil

ISBN: (纸本)9783031666087;9783031666094

Conjugate heat transfer plays a crucial role in numerous engineering applications, such as thermal management of electronic devices, aerospace heat shields, and energy systems. This paper explores the utilization of Graphics Processing Units (GPUs) and the CUDA-C programming language for solving conjugate heat transfer problems. Three distinct heat transfer scenarios are investigated: the Lid-Driven cavity, squared cavity with natural convection, and squared cavity with a solid square embedded in the center. These problems are solved using numerical methods and parallelized using GPU computing techniques to enhance computational efficiency and reduce simulation time. The Lid-Driven cavity problem involves the flow of a fluid within a square enclosure, where one side is subjected to a constant velocity boundary condition. In the squared cavity with natural convection, the study focuses on heat transfer phenomena occurring due to density-driven fluid motion. The buoyancy effects induce convective currents within the cavity, influencing the temperature distribution. The squared cavity with a solid square in the center represents a more complex conjugate heat transfer problem. The presence of the solid square influences the flow patterns and temperature distribution within the cavity. Through the utilization of GPUs and CUDA-C programming, the computational efficiency of solving conjugate heat transfer problems is greatly enhanced. The parallel processing capabilities of GPUs enable accelerated simulations, reducing the time required for solving these complex problems. The study demonstrated that the proposed algorithm achieved up to 99.7% reduction in simulation time for the laminar lid-driven cavity problem. The results obtained from the simulations provide valuable insights into the heat transfer characteristics, facilitating the optimization of thermal management systems and the design of more efficient heat exchangers. Overall, this study demonstrates the effective

关键词： CUDA Conjugate Heat Transfer Computational Fluid Dynamics Finite Volumes

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Smart Materials for Biomedical Application 10th

Smart Materials for Biomedical Application

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10th International Conference on Design and Modeling of mechanical Systems (CMSM)

作者： Trimeche, Monia Ben Cheikh, Ridha Tunis El Manar Univ Natl Sch Engineers Tunis Dept Ind Engn Lab Mat Optimizat & Energy Sustainabil LAMOED Tunis Tunisia

ISBN: (纸本)9783031650062;9783031650079

In clinical practice, bone defects, often associated with infections or other bone diseases, present substantial challenges. Several implantable biomaterials have demonstrated potential in bone therapy and regeneration, aiding in the repair, replacement, or restoration of both hard and soft tissues. Nevertheless, the presence of residual tumors or severe infections within the original pathological microenvironment of bone defects can impede effective bone regeneration. Consequently, there is a critical demand for the development of versatile biomaterials capable of integrating both bone therapy and regeneration functions. While traditional smart biomaterials respond to stimuli, the evolving field calls for a fresh perspective on biomaterial intelligence. This work delves into the latest breakthroughs and practical applications of intelligent biomaterials in the restoration and regeneration of hard tissues, all while highlighting the challenges associated with developing new engineered biomaterials.

关键词： Implantable biomaterials Smart scaffold Immune-sensitive Shape-memory Electromechanical-stimulus

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Performance of Acoustic Doppler Vectrino Profiler in Measurement of Velocity Profile in Mobile Bed Channel 23rd

Performance of Acoustic Doppler Vectrino Profiler in Measure...

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2022 International Association for Hydraulic Environmental engineering and Research Asia Pacific Division

作者： Gurugubelli, Yatirajulu Rathod, Laxman, V Timbadiya, P., V Barman, Bandita Sardar Vallabhbhai Natl Inst Technol Dept Civil Engn Surat 395007 India Indian Inst Technol Dept Civil Engn Indian Sch Mines Dhanbad 826004 Bihar India

ISBN: (纸本)9789819760084;9789819760091

Pulse-to-pulse coherent Doppler systems have been commercially available in the past few decades. In challenging situations, these devices give high precision and low noise data. The pulse coherent profilers may also measure relatively small cell sizes and offer significantly more flow information than typical Doppler systems. Advanced techniques expand measuring capabilities that rely on the establishment of experimental parameters, extending the needed expertise for both researchers and practitioners. The Nortek Vectrino Profilers technical specifications, operational principles, and previously reported user experiences are compiled in this paper. The acoustic Doppler Vectrino profiler (ADVP) can collect a profile of 30 mm at a spatial resolution of 1 mm. Liu et al.(2022) conducted experiments in the laboratory flume and reported the four best probe configurations of the ADVP based on the velocity profile data. In the present study, experiments were performed in the laboratory flume for best probe configuration reported by the aforesaid authors to look at the performance and behaviour of the instrument, with an emphasis on variations in the velocity profile. The collected velocity data were filtered using the phase space threshold method and used for turbulent analysis. The measured velocity profile using ADVP is not well-reported, when considering 10 and 30 mm profiling lengths.

关键词： Acoustic Doppler vectrino profiler (ADVP) Velocity profile Probe configurations

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Research on Design and Manufacturing of Pelvic Bone Structure by Fused Deposition Modeling Method 8th

Research on Design and Manufacturing of Pelvic Bone Structur...

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8th International Scientific-Technical Conference (MANUFACTURING)

作者： Pacurar, Razvan Friciu, Gabriela Sabau, Emilia Vilau, Cristian Gutiu, Eugen Nemes, Ovidiu Vitkovic, Nikola Labudzki, Remigiusz Pacurar, Ancuta Tech Univ Cluj Napoca Cluj Napoca Romania Univ Nis Nish Serbia Poznan Univ Tech Poznan Poland

ISBN: (纸本)9783031564581;9783031564567

This research explores the possibilities of realizing pelvic bone structures by 3D printing methods, focusing on all stages of developing of a new product, starting with the designing process of the structure, continuing with finite element analysis, and ending with manufacturing and testing steps that are necessary to be done in the end for validating of the research. Key elements that have been considered in the realized research include an exploration of pelvic anatomy, existing prostheses, and relevant research, with a primary focus on mimicking spongy tissues. The design phase introduces circular and square porous structures which have been integrated into test samples, alongside the creation of a pelvic bone model that has been realized by 3D printing methods. The manufacturing process of samples and realized prototype was realized by Fused Deposition Modeling using biodegradable Polylactic Acid (PLA) material, the experimental part being followed by mechanical testing that has been performed using the realized samples to determine the compressive, tensile and flexural strength characteristics. Finite Element Analysis which has been realized has revealed the superior mechanical characteristics of the circular porous structure, characteristics reached through mechanical testing, being further on used to estimate the mechanical behavior of a pelvic bone in the end. The research presented in the paper ends with the 3D scanning processes of pelvic bone and an acetabular cup that were realized by 3D printing methods, aiming to assess the clearance between these elements, emphasizing the potential of using the 3D printing methods to produce such porous structures that mimic the pelvic bone structure in the end.

关键词： pelvic bone structure porous structures 3D printing fused deposition modeling finite element analysis

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Failure Analytics of Defects in mechanical engineering Parts Using Root Cause Analysis: Case Study 8th

Failure Analytics of Defects in Mechanical Engineering Parts...

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8th International Scientific-Technical Conference (MANUFACTURING)

作者： Berladir, Khrystyna Hovorun, Tetiana Trojanowska, Justyna Ivanov, Vitalii Iakovets, Angelina Sumy State Univ 116 Kharkivska St UA-40007 Sumy Ukraine Tech Univ Kosice 1 Bayerova St Presov 08001 Slovakia Poznan Univ Tech 5M Sklodowska Curie Sq PL-60965 Poznan Poland

ISBN: (纸本)9783031564468;9783031564444

The paper is devoted to creating a methodological approach to apply root cause analysis for solving the specific materials science task. The case study determined the causes of the destruction of the elements of the exhaust tract of the gas pumping unit. Root cause analysis was used as a systematic process to identify and address the underlying causes of problems or incidents rather than just addressing their symptoms. In the first step of defining the problem, a destroyed element of the exhaust tract of the gas pumping unit was chosen to discover the causes of its failure. In the second step of collecting the data, the failure analytics of a destroyed element was carried out. In the third step, a mnemonic called 6Ms of production was used to identify as many causal factors as possible. In the fourth step, causal factors were analyzed in detail, and the root causes were determined. In the fifth step, the recommendations for implementing solutions to the above mentioned problem were given.

关键词： Root Cause Analysis Fracture 6Ms of Production Cause-and-effect Diagram Process Innovation Industrial Growth

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Sensitivity Analysis of the Convective Nanofluid Flow Over a Stretchable Surface in a Porous Medium 14th

Sensitivity Analysis of the Convective Nanofluid Flow Over a...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Khashi'ie, Najiyah Safwa Mukhtar, Mohd Fariduddin Hamzah, Khairum Arifin, Norihan Md Sheremet, Mikhail Pop, Ioan Univ Tekn Malaysia Melaka Fak Teknol & Kejuruteraan Mekan Durian Tunggal 76100 Melaka Malaysia Univ Tekn Malaysia Melaka Fak Teknol & Kejuruteraan Ind & Pembuatan Durian Tunggal 76100 Melaka Malaysia Univ Tekn Malaysia Melaka Forecasting & Engn Technol Anal FETA Res Grp Durian Tunggal 76100 Malaysia Univ Putra Malaysia UPM Inst Math Res Serdang 43400 Selangor Malaysia Univ Putra Malaysia UPM Fac Sci Dept Math Serdang 43400 Selangor Malaysia Tomsk State Univ Lab Convect Heat & Mass Transfer Tomsk 634050 Russia Babes Bolyai Univ Dept Math Cluj Napoca 400084 Romania

ISBN: (纸本)9783031666087;9783031666094

The aim of the present study is to analyze the nanofluid flow towards a stretching sheet located in a porous medium using both numerical and statistical methods. Another consideration of physical parameters from the standpoint of thermal applications includes the magnetic field and thermal convection. The fluid transport within the porous medium is modeled using the Darcy-Forchheimer-Brinkman equation. Meanwhile, the Tiwari and Das model of nanofluid is adopted where the water is considered as the base fluid and single-walled carbon nanotubes (SWCNTs) as the testing nanoparticles. The local non-similarity (LNS) method is used to transform the partial differential equations (PDEs) into the first and second truncation levels which are then solved using the bvp4c solver. The response surface methodology (RSM) and sensitivity analysis are conducted to highlight the impact and significance of the physical factors like magnetic parameter, nanoparticle's concentration and Darcy number (porous parameter) to the response (heat transfer). Based on the sensitivity analysis, the response has the largest value when low/minimum usage of magnetic parameter and nanoparticle's concentration is applied. The thermal rate is not significantly affected by the increment of magnetic parameter but remarkably developed by the upsurge of Darcy number with the use of low nanoparticle's concentration.

关键词： Nanofluid Porous Media Response Surface Methodology Sensitivity Analysis Stretching Surface

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Effect of Control Laws for Torque-Vectoring Systems on Steady-State Cornering in Race Cars 16th

Effect of Control Laws for Torque-Vectoring Systems on Stead...

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16th International Symposium on Advanced Vehicle Control

作者： Kobayashi, Ikkei Yoshida, Fumiya Fu, Liting Ebashi, Yusuke Yamada, Hayato Kuroda, Jumpei Uchino, Daigo Ogawa, Kazuki Ikeda, Keigo Kato, Taro Endo, Ayato Bin Peeie, Mohamad Heerwan Katol, Hideaki Narita, Takayoshi Tokai Univ Course Sci & Technol Hiratsuka Kanagawa Japan Tokai Univ Res Inst Sci & Technol Hiratsuka Kanagawa Japan Tokai Univ Course Mech Engn Hiratsuka Kanagawa Japan Natl Inst Technol Numazu Coll Dept Mech Engn Numazu Japan Aichi Univ Technol Dept Elect Robot Gamagori Japan Hokkaido Univ Sci Dept Mech Engn Sapporo Hokkaido Japan Tokyo Univ Technol Dept Mech Engn Hachioji Tokyo Japan Fukuoka Inst Technol Dept Elect Engn Fukuoka Japan Univ Malaysia Pahang Fac Mech & Automot Engn Pekan Malaysia Tokai Univ Dept Mech Syst Engn Hiratsuka Kanagawa Japan

ISBN: (纸本)9783031703942;9783031703928;9783031703911

This paper presents an analysis of the control law for a torque-vectoring system that actively distributes left and right drive torques to maximize the steady-state cornering performance of a rear-wheel drive race car. The control law allocates torque to the left and right vertical load distribution. Steady-state analysis results show that the maximum lateral acceleration could be improved by 7.8% by decreasing the maximum slip ratio and altering the point at which the yaw moment is trimmed compared to the existing passive system. Furthermore, the stability of the system is reduced, and measures to ensure stability are presented.

关键词： Torque-Vectoring Steady-State Cornering Performance Optimization Moment Method Simulation

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Duality Solutions in Boundary Layer Flow and Heat Transfer of SWCNTs-MWCNTs/Water Hybrid Nanofluids over a Vertical Thin Needle with Effect of Suction 14th

Duality Solutions in Boundary Layer Flow and Heat Transfer o...

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14th International Conference on Computational Heat and Mass Transfer (ICCHMT)

作者： Samat, Nazrul Azlan Abdul Bachok, Norfifah Arifin, Norihan Md Univ Putra Malaysia Fac Sci Dept Math & Stat Serdang 43400 Serdang Malaysia Univ Sultan Azlan Shah Fac Management & Informat Technol Dept Management Perak 33000 Kuala Kangsar Malaysia Univ Putra Malaysia Inst Math Res Serdang 43400 Serdang Malaysia

ISBN: (纸本)9783031666087;9783031666094

The flow, considering the influence of gravity past a vertical thin needle, is studied analytically and numerically under the suction effect. The thin needle is presumed to be submerged in a combination of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs), and then they are incorporated together with water. The investigation was launched by assembling the thermal boundary layer equation within a system of partial differential equations (PDEs) and bringing together this system with a number of boundary conditions. To reduce the complexity of computation, the PDEs system was conversed to non-dimensional ordinal differential equations (ODEs) by using similarity variables. Then, the ODEs system was successfully solved in a MATLAB build-in function, called bvp4c. Several parameters, such as the suction parameter, the nanoparticles volume fraction parameter, and the assisting/opposing flow parameter, were shown graphically to show how they affected the computational results and physical quantity solutions. Based on our analysis, there existed multiple solutions for the opposing flow, and boundary layer was separated slowly due to the suction effect. Besides, it was revealed that carbon nanotubes (CNTs) hybrid nanofluid contributed a higher rate of heat transfer than CNTs nanofluids.

关键词： Suction Effect Boundary layer Flow Heat Transfer CNTs Hybrid Nanofluids

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