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

共 6719 条记录，以下是171-180 订阅

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Does Bony Morphology Influence Anterior Cruciate Ligament Reconstruction Surgical Outcomes? 4th

Does Bony Morphology Influence Anterior Cruciate Ligament Re...

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4th International Conference of the Italian Association of Design Methods and Tools for Industrial engineering

作者： Ghidotti, Anna Zamarian, Andrea Regazzoni, Daniele Cohen, Miri Weiss Condello, Vincenzo Univ Bergamo Dept Management Informat & Prod Engn Via Pasubio 7-B Bergamo Italy Braude Coll Engn Dept Software Engn Snunit St IL-185200 Karmiel Israel Humanitas Castelli Clin Via Mazzini 11 I-24128 Bergamo Italy

ISBN: (纸本)9783031765933;9783031765940

Surgery for Anterior Cruciate Ligament Reconstruction (ACL-R) is common and generally successful. This study investigates whether specific bony morphologies can predict surgical outcomes and patient life quality post-ACL-R. The study involves eighteen patients who underwent ACL-R, with magnetic resonance images used to reconstruct their distal femur and proximal tibia. 3D models are utilized to measure morphological parameters identified in the literature. Knee health is assessed using the KOOS questionnaire, dividing patients into two groups based on scores (>= 60 and <60). Statistical analysis, including correlation matrix, t-tests (or Mann-Whitney tests), and logistic regression, is performed to evaluate the impact of bone morphology on surgical outcomes. The results indicate no significant association between bony morphology and surgical outcomes. Further research with a larger patient cohort and consideration of additional factors, such as surgical approach and graft size, is recommended to validate these findings.

关键词： Anterior Cruciate Ligament 3D Modeling ACL-R Bony Morphology KOOS questionnaire

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Layer Height Treatments on Uniaxial Compression Performance of Industrial Large-Scale Additively Manufactured Polymer Composite Structures 5th

Layer Height Treatments on Uniaxial Compression Performance ...

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5th International Symposium on Dynamic Response and Failure of Composite Materials

作者： Perez, Alfonso A. Arroyo, Pablo Sehnawi, Kenan H. Chandar, Arjun S. Hardt, David E. MIT Cambridge MA 02139 USA

ISBN: (纸本)9783031776991;9783031776977;9783031776960

The prefabricated pile footing structures presented in this paper demonstrate that large (3' x2' x 1'), mostly hollowstructures are indeed manufacturable through industrial large scale polymer additive manufacturing (ILSPAM). Additionally, this work identifies manufacturing process defects which resulted from the production of such structures. Processing failures during manufacturing prompted the modification of process control parameters (layer height, material choice). This yielded four specimens, each with a unique treatment modification combination. This paper utilizes an experimental setup [1] for analyzing the effect of various processing treatments on large-scale additively manufactured thermoplastic structures. Specifically, it presents and compares the uniaxial compression results of layer height and material treatments on pile footings made with virgin and recycled glass fiber reinforced PETg (PETg-GF) using cyclic loading experiments. Force-displacement experiments were conducted to determine and compare the effects of such modifications on the uniaxial compression performance of the different specimens. The authors note that the data supports the hypothesis that increasing layer height will decrease the stiffness of additively manufactured structures. Furthermore, the cyclic uniaxial compression experiments conducted on the pile footings validate the applicability of the related experimental setup for multiple large-scale additively manufactured structural products. Finally, the authors recommend further experiments and analysis to determine the effect of material choice, as well as experiments with smaller specimens to address the limitations of measuring large-scale structures.

关键词： Additive Manufacturing Large Structures Composites Repeatable Experiments Layer Height PET with glass fiber Displacement

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Integrating Social Impact Indicators into Environmental Analysis: A Proposal for Televisit Assessment 4th

Integrating Social Impact Indicators into Environmental Anal...

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4th International Conference of the Italian Association of Design Methods and Tools for Industrial engineering

作者： Savoldelli, Anna Landi, Daniele Rizzi, Caterina Univ Bergamo Dept Management Informat & Prod Engn Via Pasubio Bergamo Italy

ISBN: (纸本)9783031765933;9783031765940

Social impacts investigation is a crucial aspect for healthcare sustainability. Current literature offers fragmented approaches for telemedicine assessment. Thus, this study aims to define indicators and propose a methodology to assess its social impact. It integrates social analysis extending a prior environmental evaluation of a televisit process for heart failure patients. Starting from Social Life Cycle Assessment (S-LCA) and Product Social Impact Assessment (PSIA) guidelines (UNEP 2020), stakeholder groups were identified: patients, caregivers, healthcare and administrative staff, hospital and provincial municipalities. Indicators were acquired from literature and formalized. Initial evaluation included time and cost savings for patients and caregivers throughout the entire processes (in-person or virtual appointments). The inventory was compiled involving a multidisciplinary team and using national databases. Finally, a 5-point scale (-2 to +2) was introduced to facilitate the results comparison. During traditional visits, patients spent 98.57 pound and caregivers 78.97 pound for prescription and visit phases, respectively. In televisit processes, total expenditures were 24.01 pound for patients and 19.6 pound for caregivers. The televisit delivery phase had the most significant benefits in both environmental and social impacts. Using the proposed framework allows for a formalized approach to broaden assessments, providing a more comprehensive overview for decision-making.

关键词： Social Impact Sustainable Development Stakeholders Telemedicine Healthcare sector

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A Simulation Study of DDMRP and MRP Manufacturing Planning and Control Systems 6th

A Simulation Study of DDMRP and MRP Manufacturing Planning a...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Guedes, Nelson Ferreira, Luis P. Silva, Francisco J. G. Fernandes, Nuno O. Carmo-Silva, S. ISEP Polytechn Porto Rua Dr Antonio Bernardino Almeida P-4249015 Porto Portugal Assoc Lab Energy Transports & Aerosp LAETA INEGI Rua Dr Roberto Frias 400 P-4200465 Porto Portugal Inst Politecn Castelo Branco Ave Empresario P-6000767 Castelo Branco Portugal Univ Minho Algoritmi Res Ctr Campus Azurem P-4800058 Guimaraes Portugal

ISBN: (纸本)9783031827488;9783031827464;9783031827457

Demand Diven Material Requirements Planning (DDMRP) is a manufacturing planning and control system for fast response to customer requirements in varying and volatile demand and supply markets. DDMRP is an extension of the Material Requirements Planning (MRP) approach that explores the principles of Lean and Theory of Constraints production philosophies to reduce manufacturing response time and make good use of manufacturing resources. It achieves this by promoting flow through selective, reduced, and continuously adjusted inventory levels to synchronize manufacturing and supply with customer market demand. Only a few studies compared the performance of both approaches. However, these studies have not fully addressed the relationship between inventory and service levels. Therefore, this research contributes to a better understanding of this relationship by evaluating and comparing the performance of these two approaches in a multi-product, multi-stage production system. The results of a discrete-event simulation study show that DDMRP outperforms MRP regarding the work-in-process and finished-goods-inventory levels required to achieve a given service level.

关键词： DDMRP MRP Simulation

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Digital Process Optimization of an Aeronautical Assembly Line: A Case Study at Leonardo S.p.A. 4th

Digital Process Optimization of an Aeronautical Assembly Lin...

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4th International Conference of the Italian Association of Design Methods and Tools for Industrial engineering

作者： Cinque, Alessandro Lanzotti, Francesca Giovanna Giacomobello, Rosanna Di Gironimo, Giuseppe Leonardo SpA Piazza Monte Grappa Rome Italy Univ Naples Federico II Ple Tecchio 80 I-80125 Naples Italy Univ Padua Via Gradenigo 6-A I-35131 Padua Italy

ISBN: (纸本)9783031765964;9783031765971

The digital modeling and optimization of production processes in the aerospace sector are crucial endeavor for enhancing operational efficiency and competitiveness. This paper presents the process optimization strategy of an aerospace production line by adopting the discrete event simulation technique. The 3DExperience platform has been chosen as a promising co-simulation tool for the digital model development. The production processes have been digitally modeled, and process flows have been analyzed for achieving a comprehensive line flow balancing optimization identifying critical bottlenecks. Various scenarios have been analyzed and compared enhancing process operational efficiency. Initial results outline significant imbalances in the utilization of workstations, suggesting a lack of efficiency in resource allocation. The simulation phase has demonstrated that strategic line balancing can mitigate the issues, leading to more balanced workloads among the stations.

关键词： Process Optimization Line Flow Balancing Assembly Line Aeronautical Components

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Analysis of Power Consumption of a Wheeled Robot Actuated by a Centrifugal Vibration Exciter 6th

Analysis of Power Consumption of a Wheeled Robot Actuated by...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Korendiy, Vitaliy Kachur, Oleksandr Lanets, Olena Predko, Rostyslav Lviv Polytech Natl Univ 12 S Bandera St UA-79013 Lvov Ukraine Univ Kingston Penrhyn Rd Kingston Upon Thames KT1 2EE Surrey England

ISBN: (纸本)9783031827488;9783031827464;9783031827457

Currently, there is considerable interest in the principles of locomotion driven by vibrations, particularly in the field of mobile robotics. Among the various types of robotic chasses, wheeled ones are the most commonly utilized. The primary objective of this research is to define the dynamic and force characteristics of a wheeled vibratory robot driven by an imbalanced rotor (centrifugal exciter) and equipped with overrunning clutches providing one-way rotation of the robot's wheels. The latter allows the robot to move in a single direction. The research methodology contains several main stages: developing the dynamic diagram of the robot's mechanical system and deducing the locomotion equations;modeling (simulation) of the robot's dynamic behavior in Mathematica software under specific operational conditions;creating the 3D design of the wheeled platform in SolidWorks software;and finally, constructing the laboratory prototype of the vibration-driven robot and carrying out the full-scale experimental investigations. The obtained outcomes illustrate the time dependencies of the platform's speed, displacement, and consumed power under specific operating conditions. The primary scientific contribution of this research is establishing the relationships between the parameters of the platform's mechanical system and its dynamic and force characteristics at specific operating conditions. The investigations can be valuable for designers and researchers who work on mobile vibration-driven robotic vehicles, capsule-type robots, pipeline cleaning systems, vessel inspection devices, and similar applications. Further research on the considered topic may be focused on optimizing the excitation conditions to maximize the average locomotion velocity and minimize the power consumption.

关键词： Vibration-Driven Robot Wheeled Chassis Force Characteristics Imbalanced Rotor Free-Wheel Clutch Vibration-Driven Locomotion

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Simulation of the Shaft Surface Strengthening as a Result of Discrete Electro-mechanical Processing 6th

Simulation of the Shaft Surface Strengthening as a Result of...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Holenko, Kostyantyn Dykha, Aleksandr Dytyniuk, Volodymyr Dykha, Maksym Horbay, Orest Khmelnytskyi Natl Univ 11 Inst St UA-29016 Khmelnytskyi Ukraine Lviv Polytech Natl Univ 12 Stepan Bandera St UA-79013 Lvov Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

The purpose of the research is electro-mechanical processing (EMP), which is based on the symbiosis of thermal and mechanical loads on the upper layer of the part during its surface strengthening. Powerful current flows through the contact point at low voltage, raising the temperature at the point of interaction to 600-900 degrees C and more. The simulation was carried out in the Ansys Static Structural and Coupled Field with the original boundary conditions that are the subject of scientific novelty, together with the designed mathematical stress prediction algorithm. The suggested multifactor EMP model (load, temperature, experiment time, convection, etc.) is promising for developing optimal surface-strengthening technologies. Two cases of mechanical pressuring with the tribocontact of curved surfaces were considered: rolling a shaft at 22 degrees C (surface plastic deformation - SPD) and modeling the contact spot body with the finite elements of 0.05 mm size under 900 degrees C (EMP). In the 1st case, despite the slight difference in vertical rod movement (0.143 mm for 4000 N and 0.119 mm for 1000 N), which signals plastic deformations, the magnitude of max stress varies considerably: 521.79 vs 130.56 MPa. In the 2nd case, being 10 times less loaded (400 N) but heated up to 900 degrees C, the model has demonstrated twice the stress - 1082.9 MPa. The formation of the so-called "white" layer at a depth of about 0.2 mm was observed.

关键词： Thermal Loads Pressure Hardness Coupled Field White Layer Tribocontact Stress-Strain Rolling Contact Spot Plastic Deformation

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Using Plasma Coatings to Increase Equipment Reliability at Agribusiness Enterprises 6th

Using Plasma Coatings to Increase Equipment Reliability at A...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Mushtruk, Mikhailo Vasyliv, Volodymyr Stadnyk, Igor Derkach, Andriy Boyko, Yuriy Natl Univ Life & Environm Sci Ukraine 15 Heroes Def St UA-03041 Kiev Ukraine Ternopil Ivan Puluj Natl Tech Univ 6 Hohol St UA-46001 Ternopol Ukraine Natl Univ Food Technol 68 Volodymyrska St UA-01601 Kyiv Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

The wear and corrosion patterns of parts in technological environments of food production result from the influence of random factors. These factors include environmental conditions, load, speed, other external influences, and material characteristics such as hardness and yield strength. As these parameters are random variables, predicting the reliability of machines and equipment should be based on assessing the probability of failure-free operation and service life. The use of plasma coatings in friction units of food equipment operating without lubrication and in acidic environments was examined. The study investigated the impact of aggressive corrosive-active environments on the wear resistance of coatings, which could potentially be used to protect equipment parts in the meat and fish processing industry. The research demonstrated the possibility of controlling the process of corrosion-mechanical wear of equipment parts by polarizing the friction zone. Test results confirmed that the process of corrosion-mechanical wear of eutectic coatings can be managed by adjusting the potential of the friction zone with an external current source. Additionally, the electrochemical characteristics of the coatings in aqueous environments were identified, explaining the process of corrosion-mechanical wear. The level of protection offered by the investigated coatings under simultaneous mechanical loads and working environments was evaluated.

关键词： Wear Protective Characteristics Plasma Coating Technological Environment Wear Resistance Equipment

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Modeling and Optimization of the Drilling Holes in Carbon Fiber Reinforced Polymer Parts 6th

Modeling and Optimization of the Drilling Holes in Carbon Fi...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Matoshyn, Oleksandr Vysloukh, Sergii Antonyuk, Victor Voloshko, Oksana Natl Tech Univ Ukraine Igor Sikorsky Kyiv Polytech 37 Beresteisksyi Ave UA-03056 Kyiv Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

The article deals with modeling the quality parameters of holes while drilling carbon fiber-reinforced polymer parts. It is noted that the mechanical processing of polymer composite materials is the most challenging operation due to the anisotropic properties of the material, the heterogeneous structure, and the abrasive nature of the fibers. It was established that the determining factors of the quality of the surface layer of the composite are delamination and roughness of the treated surface, for the determination of which mathematical dependences on drilling modes and drill parameters were researched in the work. A mathematical model of the drilling process of parts from carbon fiber-reinforced polymer is provided. The optimality criterion is the maximum productivity of processing holes with restrictions on their quality parameters. The proposed model allows you to determine the optimal drilling modes for the given parameters of the processed material and processing conditions. The practical implementation of solving the problem of optimizing carbon fiber reinforced polymer drilling modes, which ensures obtaining the necessary quality parameters - hole delamination and surface roughness, has been carried out.

关键词： Composite Materials Carbon Fiber Reinforced Polymers Drilling Delamination Roughness Drilling Modes Thrust Force Mathematical Model Productivity Optimal Modes

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Study of the Roughness of A36 Steel with TiAlN Coated Inserts 6th

Study of the Roughness of A36 Steel with TiAlN Coated Insert...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Torres, Sandino Redroban, Cristian Calderon, Edisson Barrionuevo, Alex Ortega, Roberto Inst Super Univ Cent Tecn Quito 170502 Ecuador Escuela Super Politecn Chimborazo Riobamba 060106 Ecuador Escuela Politec Nacl Dept Mat Quito 170525 Ecuador Univ Estatal Bolivar Guanujo 020152 Ecuador

ISBN: (纸本)9783031827488;9783031827464;9783031827457

This research aims to conduct an experimental design using the Taguchi Robust Design, in which the specimens resulting from CNC lathe machining are subjected to roughness testing. An experiment was carried out using the Taguchi technique and an orthogonal matrix L27, where the parameters were analyzed: cutting speed, feed speed, depth of cut at three different levels, and their influence on surface roughness. The objective was to assess the roughness surface using TiAlN-coated inserts by considering the interactions among the cutting parameters for machining steel A36. The results will be analyzed by calculating the averages of the respective interactions in the Taguchi design using Minitab 21 statistical software. The feed rate factor was the most significant among the results obtained, with a p-value of less than 0.05, indicating its importance in processing. Additionally, it was concluded that the TiALN-coated insert exhibits good workability and durability when obtaining samples of this type. Moreover, the analysis focused on determining the best machining parameters.

关键词： Taguchi Method Roughness CNC Turning Cutting Parameters A36

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