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Vibration Response Analysis of Submerged Floating Tunnel in Dongwuyang Fiord in Normal Service Condition 15th

Vibration Response Analysis of Submerged Floating Tunnel in ...

引用

15th International Conference on Vibration Problems (ICoVP)

作者： Xiang Yiqiang Gao Chaoqi Shen Yonggang Deng Liang Zhejiang Univ Coll Civil Engn & Architecture Hangzhou 310058 Peoples R China Zhejiang Univ Coll Civil Engn & Architecture Res Ctr SFT Hangzhou 310058 Peoples R China Zhejiang Univ Collaborat Innovat Inst Hangzhou 310058 Peoples R China Zhejiang Commun Construct Grp Co Ltd Hangzhou 310058 Peoples R China

ISBN: (纸本)9789819959211;9789819959228

Taking the channel to be built in Dongwuyang fiord as the engineering background, the conceptual design of the Dongwuyang channel project is propsed. It is the combination of a 100 m-long submerged floating tunnel (SFT) and a 570 m-long immersed tube tunnel. For the preliminary design of submerged floating tunnel, the length of every tube segment is taken as 100 m. There are 10 tube segments in total and the section of tube is hexagon-like. The tube segments are connected by the special joints, and each tube segment is tensioned by two groups of the paired anchor cables. The distance between the paired anchor cables is 50 m. Each group of paired anchor cables has four cables with an inclination angle of 45 degrees. The vibration response and internal force deformation of the SFT in Dongwuyang fiord are analyzed under the action of the dead load plus buoyancy, ambient wave, current load, and vehicle load. The calculation results show that the displacement and bending moment of the SFT tube body and the cable force of the anchor cables are the largest under the action of dead load and buoyancy, and the maximum vertical displacement value is 7.02 cm. The structural response under vehicle load is smaller than under dead load plus buoyancy, and the maximum vertical displacement value is only about 0.92 cm. Under the action of wave force with wave height H = 4.39 m, period T = 6.2 m, and wavelength L = 59.8 m in 100 years, the maximum horizontal and vertical displacement amplitude of the SFT tube body are 1.05 cm and 0.90 cm, respectively. Under the action of the maximum flow velocity of 1.33 m/s, the maximum mid-span vibration displacement of the SFT tube body is 2.1 mm. It shows that the SFT has sufficient dynamic stiffness under the combined action of live load (vehicle, wave, and current), and the flexural-to-span ratio of SFT is within l/2000-2500.

关键词： Submerged floating tunnel Cross-sea channel Finite element method Vibration response Stiffness Analysis

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Characteristics and Capabilities of the Saudi Low Power Research Reactor (LPRR)

Characteristics and Capabilities of the Saudi Low Power Rese...

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Saudi International Conference on Nuclear Power engineering (SCOPE)

作者： Alomari, Abdullah S. Alqahtani, Meshari Alwafi, Anas Alghamdi, Ahmed King Abdulaziz City Sci & Technol KACST Nucl Technol Inst POB 6086 Riyadh 11442 Saudi Arabia

ISBN: (纸本)9783031643613;9783031643620

The Saudi Low Power Research Reactor (LPRR) is one of the prominent Saudi Vision 2030 projects. It is a pool-type multipurpose low power nuclear reactor designed and developed by King Abdulaziz City for Science and Technology (KACST) with the participation of international expertise in accordance with the best and highest international safety standards. The reactor is under construction and expected to be fully commissioned by mid-2024. In line with the Saudi Vision 2030, the Saudi LPRR will thoroughly contribute to the innovative design and development of the nuclear reactor industry in the Kingdom, developing and qualifying competencies and building human capacity to operate nuclear power reactors, and transferring nuclear energy technologies. The LPRR is equipped with several attractive facilities with various capabilities and designed as a multipurpose low power reactor to support demands on research, education, training for building human capital, and developing the competencies to support the country's national atomic energy project. In this paper, the main characteristic of the Saudi LPRR will be presented in terms of the reactor core design, main utilization, and training capabilities.

关键词： Research Reactor Nuclear Education and Training Neutron Physics Experiments Utilization

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Optimization of Mass Loss During Abrasive Wear of Nitrided AISI 4140 Steel Parts 10th

Optimization of Mass Loss During Abrasive Wear of Nitrided A...

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

作者： Daghbouch, Ahmed Terres, Mohamed Ali Univ Sousse Higher Inst Appl Sci & Technol Sousse ISSATSo Taffala City 4003 Sousse Tunisia Univ Tunis Mech Mat & Proc Lab LMMP High Natl Sch Engineers Tunis ENSIT 5 Taha Hussein Ave Montfleury Tunis 1008 Tunisia

ISBN: (纸本)9783031650062;9783031650079

This study aims to reduce the wear of parts made of gas nitrided AISI 4140 steel. This steel has mechanical and physical characteristics superior to most conventional materials, with a very high hardness after gas nitriding. AISI 4140 steels are often subjected to abrasive wear tests, which can result in mass loss. Efforts are therefore necessary to reduce this degradation. An in-depth optimization study is proposed to examine the effects of the hardness of the steel, the normal load, and the speed of wear. Tools such as experimental designs and analysis of variance are used to decipher the impact of each factor on the response variable studied and identify the predominant factors. Among these factors, the normal load is the most significant, with a lower load resulting in less mass loss. Hardness is the second most significant factor, Speed is the least. The hardness also has an interaction effect with the other two factors, which reduces mass loss. The optimal conditions retained are a normal load of 100 N, a Speed of 4.18 m/s, and a Hardness of 1092 HV.

关键词： Gas Nitriding Optimization Wear resistance Mass loss AISI 4140 steel

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The Well-Being of Workers in Lean Manufacturing Work Environments 32nd

The Well-Being of Workers in Lean Manufacturing Work Environ...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Calcerano, Tomaz Ferreira, Luis Miguel D. F. Pinto, Ana Univ Coimbra Dept Mech Engn Coimbra Portugal Univ Coimbra Dept Mech Engn CEMMPRE Coimbra Portugal Univ Coimbra Fac Econ CeBER Coimbra Portugal

ISBN: (纸本)9783031381645;9783031381652

Lean philosophy has been widely introduced in many manufacturing and service industries, allowing for increased operational gains and creating a relationship between the work environment and the workers' well-being. This study aims to understand the relationship between Lean and workers' well-being on a shop floor. A questionnaire based on the Job Demands-Resources (JD-R) model was conducted in an industrial company in Brazil, and a total of 165 responses were collected. Through an exploratory factor analysis (EFA), eight factors were identified (soft Lean practices, Lean training, the pace of work, small group problem solving, interdependencies, problem-solving work demands, engagement and exhaustion). Posteriorly, a cluster analysis allowed us to identify 3 distinct groups in the sample, cluster 1 - includes those employees with a high level of engagement and exhaustion: cluster 2 - employees with a moderate level of engagement and exhaustion;and cluster 3 - employees with a low level of engagement and exhaustion. Additionally, using multiple linear regression analysis, it can be concluded that soft Lean practices (0.46) and the pace of work (-0.23) are the variables that most influence the engagement, and the same can be observed regarding exhaustion, where soft Lean practices (-0.36) and pace of work (0.40) also present statistically significant results.

关键词： Lean Manufacturing work environment employees' well-being occupational health

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Exploring in the Application Slicing Technology to Determine Spatial Information to Assist and Facilitate Robotic Disassembly 1

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7th International Workshop on Autonomous Remanufacturing (IWAR)

作者： Ng, Kok Weng Chin, Hui Yin Ang, Mei Choo Liu, JianBang Kor, Ah-Lian Shah, Meshal Iqbal Univ Nottingham Malaysia Fac Sci & Engn Dept Mech Mat & Mfg Engn Semenyih 43500 Selangor Malaysia Univ Kebangsaan Malaysia Inst Visual Informat Bangi 43600 Selangor Malaysia Leeds Beckett Univ Leeds England

ISBN: (数字)9783031526497

ISBN: (纸本)9783031526480;9783031526497

As lowering manufacturing cost and improving resource sustainability is becoming more critical, remanufacturing has attained significant attention in the manufacturing industry. Disassembly is the first step and consumes the most time in remanufacturing. There are three ways to disassemble a part and they are: manual disassembly (MD), human-robot collaborative disassembly (HRCD), and robotic disassembly (RD). RD is a disassembly method using robots without any human intervention and is the focus of this research work. To implement RD, spatial information is crucial. As end-of-life (EOL) products are likely to be discontinued products, the digital models for these products are not likely to be available and determining spatial information using vision systems to facilitate RD may not be possible due to occlusion and inaccessibility caused by restrictive spatial environments such as car under bonnet. However, a digital model of EOL products (including their internal profiles) can be obtained using 3D scan or computed tomography (CT) scan and subsequently, sliced into layers to determine essential spatial information to facilitate RD. Therefore, this research work has proposed to explore the application of slicing technology to assist the RD of a car battery within a car engine compartment where a scanned digital model of the car engine (under the bonnet compartment) is sliced into layers and exported as a text file known as geometry-code (G-code) that contains a large amount of geometrical information that can be used to determine the geometry, location of each component and spatial availability information of an EOL product. The results show that the x, y, z coordinates extracted from G-code can be used to define the spatial availability and identify the barriers and facilitate the creation of collision free paths for RD.

关键词： Remanufacturing Robotic disassembly Sustainability Slicing

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By-Pass Tunnel-A Lifeline for Run-of-River Hydro Projects 23rd

By-Pass Tunnel-A Lifeline for Run-of-River Hydro Projects

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

作者： Verma, M. K. Qamar, M. Z. Meshram, A. P. Isaac, Neena Cent Water & Power Res Stn Pune Maharashtra India

ISBN: (纸本)9789819760084;9789819760091

The size and quantum of silt has a major impact on the operation of hydropower projects in terms of siltation of reservoirs and serious damage to the equipment. Damages to turbine and under water parts due to abrasive action of silt carried by rivers, especially the steep sloping Himalayan rivers, result in frequent shutdowns of power stations with consequent loss in power generation and this has been causing a serious concern. The prevention of medium and coarse fraction of suspended sediment entering into the power intake of run-of-the-river hydroelectric projects is thus of paramount importance. Hence various measures to deal with such sediment problems in run-of-river schemes have to be employed at investigation and design stage for new upcoming projects and also for existing projects at operation and maintenance stage. This paper intends to highlight the various existing methods and recent developments for elimination/reduction of silt content from the reservoir as well as the water conductor system. The concept of bypassing tunnel for managing the suspended sediment in hydro power projects is emerging as a new technique and is discussed in this paper with the help of model studies for Nathpa Jhakri H. E. Project, which has substantiated the importance of this technique.

关键词： Sediment bypassing tunnel Suspended sediment

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Outsourcing Optimization in Footwear Industry: The Case of a Portuguese Company 32nd

Outsourcing Optimization in Footwear Industry: The Case of a...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Costa e Silva, Eliana Francisco, Raquel Sousa, Sandra P. Braga, Vitor Politecn Porto CIICESI ESTG Felgueiras Portugal Univ Minho NIPE Braga Portugal Politecn Porto ESTG Felgueiras Portugal

ISBN: (纸本)9783031382406;9783031382413

When market's demand exceeds the company's manufacturing capacity, subcontracting is generally considered an effective alternative. This work presents an empirical study with real data from a Portuguese company in the footwear industry. The aim is to propose an approach, based on mathematical programming, to support production planning decision-making. More precisely, it is expected to contribute to a working tool that can assist the company in planning the distribution of orders for internal or external production, while minimizing the total production costs. The results point to benefits in reducing the number of orders to produce externally. Further, no relevant differences were found for biweekly and monthly, and by article and by order planning.

关键词： Outsourcing Footwear Industry Optimization Binary Linear Programming Assignment Problem

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Finite Element Modelling of Tunnel Shielding in Vibration Measurements of Ground-Borne Noise 14th

Finite Element Modelling of Tunnel Shielding in Vibration Me...

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14th International Workshop on Railway Noise (IWRN)

作者： Dashti, Fatemeh Hostmad, Patrik Forssen, Jens Chalmers Univ Technol Div Appl Acoust Dept Architecture & Civil Engn S-41296 Gothenburg Sweden

ISBN: (纸本)9789819978519;9789819978526

Several factors can affect vibration levels during transmission from a tunnel to the ground surface. This study investigates the effect of a tunnel cavity in bedrock with force excitation at the tunnel floor. The tunnel geometry affects the wave propagation around the tunnel and the directivity pattern of waves propagating to the ground surface. For instance, there is no direct propagation path of ground waves from the excitation in the tunnel floor to positions on the tunnel walls. The waves reaching the walls have been diffracted at the tunnel corners. This tunnel shielding effect is here investigated regarding sensor position and direction and directivity of wave propagation up to 1 kHz using the finite element method. An underground tunnel is modelled in 2D and 3D for a bedrock ground typical for Swedish conditions. The results show that the velocity levels at the tunnel floor are higher than at the tunnel wall. It is also shown that the tunnel shielding effect causes decreased vibration levels at mid-frequencies above the tunnel and significant level fluctuations, especially at higher frequencies. The results from the 3D modeling support the 2D results.

关键词： Ground-borne noise Wave propagation Finite element method Railway tunnel Tunnel shielding effect

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DDMRP as Production Control Policy in a Two-Product Closed-Loop Supply Chain 32nd

DDMRP as Production Control Policy in a Two-Product Closed-L...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Corsini, Roberto Rosario Costa, Antonio Fichera, Sergio Framinan, Jose M. Univ Catania DICAR Dept I-95125 Catania Italy Univ Seville Sch Engn Ind Management Lab Engn Environm Sustainabil Seville Spain

ISBN: (纸本)9783031381645;9783031381652

Recently, closed-loop supply chains (CLSCs) are receiving growing attentions by the academic world since they represent a sustainable network for circular economies. However, the impact of production control policies (PCPs) on the performance of CLSCs is still unexplored. Then, this paper investigates the role of the Demand-Driven Material Requirements Planning (DDMRP) as a PCP in two-product CLSCs. The normal flow of the CLSC consists of factory and retailer nodes. The factory is characterized by a production line subject to failure events and product changeovers. The retailer issues orders to the factory through the Smoothing Order-Up-To policy and meets the customer demand. The reverse flow is represented by the remanufacturer that collects and restores the two product types coming from the customer. DDMRP is adopted by the factory node to decide what product type has to be processed. A full-factorial Design of Experiments was defined, and ANOVA was carried out to investigate the impact of remanufacturer and control parameters of DDMRP on the fill rate of the whole closed-loop supply chain. This paper allows investigating how the parameters regulating the DDMRP bias the responsiveness of two-product CLSC with capacity restrictions.

关键词： DDMRP Supply chain management Production control

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On the Effects of Process Optimization for Ti-6Al-2Sn-4Zr-2Mo Lattice Structures Produced by Electron Beam Powder Bed Fusion 32nd

On the Effects of Process Optimization for Ti-6Al-2Sn-4Zr-2M...

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32nd International Conference on Flexible Automation and Intelligent Manufacturing

作者： Galati, Manuela Giordano, Massimo Rizza, Giovanni Saboori, Abdollah Antonioni, Paolo Iuliano, Luca Politecn Torino Dept Management & Prod Engn Turin Italy

ISBN: (纸本)9783031382406;9783031382413

A lattice structure is a topologically ordered repetition of an elementary cell within a predefined volume. These specific structures ensure high mechanical performances with reduced material use. Despite, their complexity, the production of such designs is made possible thanks to additive manufacturing (AM) processes. In particular, the electron beam powder bed fusion (PBF-EB) process allows the easy production of such complex structures with high-performance metallic materials such as Ti-6Al-2Sn-4Zr-2Mo (Ti6242). This work presents the optimization of EB-PBF process for producing Ti6242 lattice structure and analyzes the effect of process tuning on the lattice structure morphometry. Non-destructive X-ray computed tomography analyses are used to disclose the causal relationship between the beam current, focus offset, and scan speed and the produced lattice structure. The results showed that the process parameters greatly influenced the lattice morphology. The measured relative density and the strut size values were systematically larger than the nominal design.

关键词： Process parameters optimization Lattice structures Titanium alloy Ti6242 PBF-EB Tomography Additive manufacturing

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