Mechanical Engineering eJournal最新文献

{"title":"Optimization of Temperature Measurement on the Bus Drum Brake as a Basis for Developing Brake Fault Signals","authors":"R. Siregar, M. Adhitya, D. Sumarsono, N. Nazaruddin, G. Heryana, S. Prasetya, F. Zainuri","doi":"10.15587/1729-4061.2021.224907","DOIUrl":"https://doi.org/10.15587/1729-4061.2021.224907","url":null,"abstract":"Brake failure is always possible due to several factors that are difficult to control, such as a slight leak in the brake hose due to an impact or a rat bite. In the latest research, the development of a brake performance detection tool has been started, but how to detect a brake temperature more efficiently on the brakes of large vehicles has not been specified. Given the significant impact of losses due to brake failure and accidents that are still occurring, this research plays an important role. It must be completed immediately so that accident cases can be reduced. The object of this research is where the position of the maximum brake temperature occurs? How to measure brake temperature is more practical? What sensor is optimal in detecting a brake temperature? The research method is carried out in a systematic stage that ends with an experimental method. This study indicates that the maximum temperature is relative to the entire friction area between the canvas and the drum brake. The most efficient sensor placement is in the hole in the drum brake cover so that installation is more practical and the brakes are not disturbed by the sensor’s presence. The optimal sensor is a thermocouple sensor because it is more stable to vibrations and more resistant to mud disturbances than infrared sensors. When using a thermocouple sensor, the temperature detection results must be corrected. The correction factor can be made with the equation y=10.3670+1.3205x–0.0003x2, where y is the actual temperature displayed, and x is the input temperature from the thermocouple sensor’s initial detection. Accurate brake temperature detection results will be developed as a signal for detecting brake faults in real-time to avoid brake failure. Finally, the safety of public transportation can be improved","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122786275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of Local Material Properties and Failure Analysis of Resistance Spot Welds of Advanced High-Strength Steel Sheets","authors":"Yunwu Ma, Akira Takikawa, J. Nakanishi, Kazuyoshi, Doira, Tetsuo Shimizu, Yongxin Lu, N. Ma","doi":"10.2139/ssrn.3772562","DOIUrl":"https://doi.org/10.2139/ssrn.3772562","url":null,"abstract":"Abstract Safety evaluation of resistance spot welds necessitates the accurate measurement of local constitutive properties. This study employed miniature mechanical tests to investigate the deformation and failure behaviors of nugget, heat affected zone (HAZ), and corona bond of resistance spot welded JSC980YL steel. A novel mini-peel test was developed to enable local fracture in HAZ for numerical inverse calibration of constitutive parameters. The fracture constants of weld zones calibrated using Cockcroft-Latham ductile failure criterion were incorporated in finite element models to predict the failure modes of spot welds in tensile-shear and cross-tension coupon tests. The result indicates that the ultimate tensile strengths of the nugget and the corona bond were 37.6% higher and 5.8% lower, respectively, than that of the base material. The nugget and HAZ exhibited ductile fracture, whereas the corona bond was brittle fracture with only 1.2% elongation. In the coupon tests, the increase of nugget diameter slowed down the damage accumulation rate in the nugget and accelerated that in the HAZ, resulting in the transition of failure mode from interfacial to pullout. The failure load of corona bond in coupon tests increased with the increase of nugget diameter while its contribution to the peak load decreased.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122214312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-dimensional Lattices Design for Ultrahigh Specific Strength Metallic Structure in Additive Manufacturing","authors":"Qing Jin, Jae-hyun Yu, Kyungsik Ha, W. Lee, Sang-hu Park","doi":"10.2139/ssrn.3805235","DOIUrl":"https://doi.org/10.2139/ssrn.3805235","url":null,"abstract":"Abstract The importance of lightweight design of mechanical parts is increasing rapidly due to material and energy savings. As additive manufacturing (AM) technology advances, the lattice structures, which are extremely difficult shapes to fabricate using conventional manufacturing processes, has attracted great interest due to their intrinsic characteristics such as high strength and lightweight. We propose an effective global-local design approach of gradient lattice structures with the selection of a lattice type in a zone and optimizing its strut diameter considering the whole loading conditions of a mechanical part, in order to obtain higher specific strength than other corresponding designs. In this work, two basic types of a lattice named as BCC and OTC, was utilized to design diverse local lattices based on optimizing a strut-diameter. To evaluate the usefulness of this approach, we designed a three-point bending test specimen with topology-optimized multi-lattice wire model, and strut-based topometry optimization on the wire model. The experimental test results show that the optimized specimen had more than 67% higher strength per weight compared to other multi-lattice ones. Through this work, we believe that this method is a promising way to effectively design high strength mechanical parts with lightweight for use in high-valuable industrial applications.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127649329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Managing Lane-Changing of Algorithm-Assisted Drivers","authors":"Mihalis G. Markakis, K. Talluri, D. Tikhonenko","doi":"10.2139/ssrn.3534301","DOIUrl":"https://doi.org/10.2139/ssrn.3534301","url":null,"abstract":"Theoretical models of vehicular traffic ascribe the fundamental cause of velocity oscillations and<br>stop-and-go waves to suboptimal or unpredictable human driving behavior. In this paper we ask: if<br>vehicles were controlled or assisted by algorithms, and hence driven \"optimally,\" would these phenomena simply go away? If not, how should a regulator manage algorithm-assisted vehicular traffic for a smooth flow? We study these questions in the context of a mandatory lane-changing scenario with \"mixed traffic,\" i.e., an algorithm-assisted driver on a curtailed lane that has to merge to an adjacent free lane with a relatively dense platoon of human drivers. In a stylized model of algorithm-assisted driving, we liken the blocked-lane driver to a rational self-interested agent, whose objective is to minimize her expected travel time through the blockage, deciding (a) at what velocity to move, and (b) whether to merge to the free lane, if given the opportunity (adequate gap). Moving at higher velocities reduces travel time, but also reduces the probability of finding a large enough gap to merge. We analyze the problem via dynamic programming, and we show that the optimal policy has a surprising structure: in the presence of uncertainty on adequate-sized gaps in the target lane, it may be optimal for the blocked-lane driver, in certain parameter regimes, to oscillate between high and low velocities while attempting to merge. Hence, traffic oscillations can arise not just due to suboptimal or unpredictable human driving behavior, but also endogenously, as the outcome of a driver’s rational, optimizing behavior. We draw out structural similarities to bang-bang control. As velocity oscillations are known to be detrimental to a smooth traffic flow, we provide sufficient conditions on the velocity limits so that traffic oscillations while merging, due to such optimizing behavior, do not arise at optimality. Finally, we investigate the fundamental flow-density and travel time-density diagrams through traffic micro-simulations. We establish that the proposed approach exhibits consistently near-optimal performance, in a broad variety of traffic conditions.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115147533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Affinity-Bound Growth Factor within Sulfated Interpenetrate Network Bioinks for Bioprinting Cartilaginous Tissues","authors":"Bin Wang, P. Díaz-Payno, David C. Browe, Fiona E. Freeman, J. Nulty, Ross Burdis, D. Kelly","doi":"10.2139/ssrn.3757909","DOIUrl":"https://doi.org/10.2139/ssrn.3757909","url":null,"abstract":"3D bioprinting has emerged as a promising technology in the field of tissue engineering and regenerative medicine due to its ability to create anatomically complex tissue substitutes. However, it still remains challenging to develop bioactive bioinks that provide appropriate and permissive environments to instruct and guide the regenerative process in vitro and in vivo. In this study alginate sulfate, a sulfated glycosaminoglycan (sGAG) mimic, was used to functionalize an alginate-gelatin methacryloyl (GelMA) interpenetrating network (IPN) bioink to enable the bioprinting of cartilaginous tissues. The inclusion of alginate sulfate had a limited influence on the viscosity, shear-thinning and thixotropic properties of the IPN bioink, enabling high-fidelity bioprinting and supporting mesenchymal stem cell (MSC) viability post-printing. The stiffness of printed IPN constructs greatly exceeded that achieved by printing alginate or GelMA alone, while maintaining resilience and toughness. Furthermore, given the high affinity of alginate sulfate to heparin-binding growth factors, the sulfated IPN bioink supported the sustained release of transforming growth factor-β3 (TGF-β3), providing an environment that supported robust chondrogenesis in vitro, with little evidence of hypertrophy or mineralization over extended culture periods. Such bioprinted constructs also supported chondrogenesis in vivo, with the controlled release of TGF-β3 promoting significantly higher levels of cartilage-specific extracellular matrix deposition. Altogether, these results demonstrate the potential of bioprinting sulfated bioinks as part of a 'single-stage' or 'point-of-care' strategy for regenerating cartilaginous tissues. Statement of Significance: This study highlights the potential of using sulfated interpenetrating network (IPN) bioink to support the regeneration of phenotypically stable articular cartilage. Construction of interpenetrate networks in the bioink enables unique high-fidelity bioprinting and unique synergistic mechanical properties. The presence of alginate sulfate provided the capacity of high affinity-binding of TGF-β3, which promoted robust chondrogenesis.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133399051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Automated Infiltrometer","authors":"Sunith John David, Samal Ummer, Jeeva MARYAM OOMMEN, R. Raj R., A. Muhammed","doi":"10.2139/ssrn.3780475","DOIUrl":"https://doi.org/10.2139/ssrn.3780475","url":null,"abstract":"An infiltrometer is a device used to measure the rate of water infiltration into soil or other porous media. The double ring infiltrometer is a widely used method of infiltration test used in many applications related to water resources engineering. The conventional method of infiltration measurement and related experimental work are too tedious and time consuming. The present work focuses on the design and development of an infiltrometer equipped with arduino which enable to collect the infiltration rate from the instrument in a more effective way without the intervention of human effort. The depth measurement in double ring infiltrometer was integrated with UV sensors, programmable arduino board, transmitter and a receiver. Mentioned innovative product produce great level of convenience compared with the conventional method.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127514996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Box Office Success Prediction Through Artificial Neural Network and Machine Learning Algorithm","authors":"Jay Bhatt, Saurav Verma","doi":"10.2139/ssrn.3753059","DOIUrl":"https://doi.org/10.2139/ssrn.3753059","url":null,"abstract":"In this study, a comparison is made between Artificial Neural Network Algorithm and Machine Learning Algorithm of Support Vector Machine by considering pre-release and pre plus post release features of a movie for predicting a movie to a particular success class. These success classes includes Flop/Disaster, Average, Hit, Super-Hit and Block-Buster of a movie. Our best performing model from Artificial Neural Network and Support Vector Machine is able to give better performance in order to predict any particular movie to specific success class of a movie for both the cases of prerelease as well as pre plus post release features of a movie.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131231726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Clamped Edge Stress Analysis in H-13 Steel","authors":"Carlos Alejo, C. T. Torres-San Miguel, J. Paredes-Rojas, Fernando E. Ortiz-Hernández","doi":"10.15587/1729-4061.2020.217845","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.217845","url":null,"abstract":"The dynamic behavior in the clamped edge stress of structures is not yet fully understood clearly; also, clamped structures involve uncertainty. This research presents a numerical and analytical study of clamped edge stress behavior due to the load imposed by the chip-cutting tool on a workpiece. Clamping system, which is made of H-13 steel and machining workpiece made of AISI 8620 steel are analyzed. The maximum clamped edge stress is analyzed through dynamic response, considering the machined part as a cantilever beam, involving the constitutive relations as well as the compatibility equations. The central differential equation of motion leads us to determine the modal stresses that are a primary characteristic of the structure and that are also distributed in it. Once the modal stress has been determined as well as the maximum amplitude at the free end of the specimen to be machined, it is possible to calculate the maximum clamped edge stress that is generated between both the specimen and the clamping system. Finally, a numerical analysis of the clamping jaw is performed for the discretised system and analyzed separately using the finite element method. Clamped edge stresses are assessed through a modal study using a set of numerical simulations to corroborate the modal stress estimated analytically. The results show that the clamped edge stress in the clamping system is a considerable influence in the design parameters of the structure. Therefore, complete knowledge of the dynamic response of the clamping system will lead to better structural design with the possibility of using different materials for the same purpose.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117072146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic Recrystallization of Silver Nanoparticles During High-Velocity Impacts","authors":"David Funes Rojas, O. K. Orhan, M. Ponga","doi":"10.2139/ssrn.3742928","DOIUrl":"https://doi.org/10.2139/ssrn.3742928","url":null,"abstract":"We study high-velocity impacts of Silver (Ag) single crystals nanocubes, their dynamic recrystallization, and post-impact lattice structure using a combination of molecular dynamics and ab-initio simulations.  Our study shows that, upon the impact, some preferential orientations have the potential to develop an intricate, architected microstructures with grains of different sizes. These selected orientations correspond to the cases where at least eight or more slip systems were simultaneously activated, leading to an avalanche dislocations. These dislocations interact and have the ability to produce severe plastic work, stimulating recrystallization in the particles. On the other hand, dynamic recrystallization was not observed for the orientations with asynchronously activated slip systems besides  large shock-wave pressures, plastic deformations, and large dislocation densities. In addition, using thermalized ab-initio simulations, we found that the severe plastic deformation can trigger phase transformation of the initial face centered cubic lattice structure to the 4H hexagonal closed-packed phase, which is thermodynamically more stable than the 2H hexagonal closed-packed phase. These results are in good agreement with experimental works. Our systematic numerical experiments shed light into the factors that promote the dynamic recrystallization and provide a pathway to control the microstructure and atomic structure by orienting nanoparticles with respect to the impact direction.","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117224754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maneuver for Stopping the Ship in a Set Point by Active or Passive Braking and Considering the Current","authors":"Yevgeniy Kalinichenko, Mykhaylo Kourov, Kateryna Volovyk","doi":"10.21303/2585-6847.2020.001473","DOIUrl":"https://doi.org/10.21303/2585-6847.2020.001473","url":null,"abstract":"The article deals with the use of active or passive braking of a ship to stop it at a given point. To substantiate the relevance of the study, an analysis of the literature on the problem of ensuring the safe maneuvering of ships was carried out, in which the issues of theoretical and experimental studies of the turnability of ships, the adequacy of the existing models of turnability to the real process of turning the ship, as well as the development of a system of autopilot control of the ship's heading using the principles of fuzzy logic were considered. Considerable attention is paid to the development of an information system for simulating the movement of ships with complex dynamic models. \u0000The necessary analytical expressions are given that characterize the dependences of the time and the distance traveled to the stop of the ship on the mode of active and passive braking, which are required to solve the problem posed in the work. \u0000A formal description of the maneuver for stopping the ship at a given point by active and passive braking is obtained. This description makes it possible to determine the moment of engine stop in case of passive braking or the moment of its reverse – in case of active braking, provided that the ship is following a heading equal to the bearing to a given point. \u0000Cases of presence and absence of current in the area of ship maneuver are considered. In the case of the presence of a current, two stages of the ship's movement are considered: from the zero moment of time until the moment of the start of braking, when the speed of the ship is unchanged, and the second stage, from the moment of the start of braking until the stop of the ship, when the speed of the ship decreases. \u0000To take into account the flow during braking with an exit to a given point, two methods are proposed. The first one is at a constant flow angle with a lateral displacement relative to the programmed trajectory of motion. And the second – with a variable flow angle at zero displacement relative to it. \u0000A successful check of the correctness of the results obtained by simulation computer modeling of maneuvers for stopping the ship at a given point of braking, taking into account the current, has been carried out","PeriodicalId":404477,"journal":{"name":"Mechanical Engineering eJournal","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124934059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}