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Optimal Design of Investment Casting system for a Stuffing Box with Pedestal of Centrifugal Pump: Computer Simulations and Experimental Verification

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Journal of the Chinese Society of mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2020年第5期41卷 551-563页

作者： Kuo, Jenn-Kun Huang, Pei-Hsing Tsai, Yu-Ting Zhong, Qi Chou, Chuen-Shii Department of Greenergy National University of Tainan Tainan70005 Taiwan Department of Mechanical Engineering National Yunlin University of Science and Technology Yunlin64002 Taiwan Bachelor's Program in Precision System Design Feng Chia University Taichung40724 Taiwan Department of Mechanical Engineering National Pintung University of Science and Technology Pingtung91201 Taiwan

The stuffing box with pedestal (SBP) is a major component in centrifugal pumps (CPs). It is responsible for the transfer of load generated in the CP to the baseplate of the pump and finally to the ground. SBPs are usually fabricated using investment casting;however, this process is prone to residual casting defects, which can reduce mechanical strength and increase the likelihood of crack formation following long-term usage. In this study, the AnyCasting numerical simulation software package was used to optimize the investment parameters for the casting of an SBP in SUS304 alloy. Optimization efforts targeted the shrinkage cavity (based on retained melt modulus) and porosity defects (based on Niyama criterion). The results of preliminary simulations and experiments informed the establishment of five casting schemes for subsequent simulation. We used virtual thermo-dynamic sensors to determine the rate and direction of solidification in the mold cavity, and also investigated variations in the velocity of the molten metal at the inlets of the gating system as a function of time. The optimal casting parameters derived in simulations were assessed by fabricating an SBP via investment casting in a domestic foundry. Nondestructive testing based on X-ray analysis revealed none of the detrimental defects commonly associated with this type of casting. © 2020, Chinese mechanical engineering Society. All right reserved.

关键词： Investment casting

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Simultaneous planar measurement of size and three-component velocity of droplets in an aero-engine airblast fuel spray by stereoscopic interferometric laser imaging technique

Simultaneous planar measurement of size and three-component ...

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10th International Conference on Liquid Atomization and Spray systems, ICLASS 2006

作者： Matsuura, Kazuaki Zarogoulidis, Konstantinos Hardalupas, Yannis Taylor, Alexander M.K.P. Kawaguchi, Tatsuya Sugimoto, Daisuke Hishida, Koichi Aviation Program Group Japan Aerospace Exploration Agency Japan Department of Mechanical Engineering Imperial College London United Kingdom Department of Mechanical and Control Engineering Tokyo Institute of Technology Japan Department of System Design Engineering Keio University Japan

A new technique is proposed to simultaneously measure the size and three-component velocity of droplets, which is the extension of the interferometric laser imaging technique to the stereoscopic configuration. The optical compression concept is also utilized to avoid droplet image overlap for the application to the relatively dense region of sprays. The applicability of the technique is successfully demonstrated by using a practical aero-engine airblast fuel spray field. The results are compared with those by the phase Doppler anemometry to evaluate the performance. The results by the two techniques show good agreement. The influence of the air pressure drop through the nozzle is also studied by the present technique and the results are reasonable and consistent with those from literatures. Some important characteristics of the complicated counter-swirling airblast spray field is clearly revealed, taking advantage of the present technique, such as the droplet motions influenced by the air flow in the recirculation zone and in the attenuated circumferential counter-swirl shear-layer structure, not only by the mean velocity values, but also by the various correlations among droplet properties.

关键词： Drops

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Bioprinting Methods for Fabricating In Vitro Tubular Blood Vessel Models

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Cyborg and Bionic systems 2023年第1期4卷 178-195页

作者： Seon-Jin Kim Min-Gyun Kim Jangho Kim Jessie SJeon Jinsoo Park Hee-Gyeong Yi Department of Rural and Biosystems Engineering College of Agriculture and Life SciencesChonnam National UniversityGwangjuRepublic of Korea Department of Convergence Biosystems Engineering College of Agriculture and Life SciencesChonnam National UniversityGwangjuRepublic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National UniversityGwangju 61186Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and TechnologyDaejeonRepublic of Korea Department of Mechanical Engineering Chonnam National UniversityRepublic of Korea

Dysfunctional blood vessels are implicated in various diseases,including cardiovascular diseases,neurodegenerative diseases,and *** studies have attempted to prevent and treat vascular diseases and understand interactions between these diseases and blood vessels across different organs and *** studies were conducted using 2-dimensional(2D)in vitro and animal ***,these models have difficulties in mimicking the 3D microenvironment in human,simulating kinetics related to cell activities,and replicating human pathophysiology;in addition,3D models involve remarkably high ***,in vitro bioengineered models(BMs)have recently gained *** created through biofabrication based on tissue engineering and regenerative medicine are breakthrough models that can overcome limitations of 2D and animal *** can also simulate the natural microenvironment in a patient-and target-specific *** this review,we will introduce 3D bioprinting methods for fabricating bioengineered blood vessel models,which can serve as the basis for treating and preventing various vascular ***,we will describe possible advancements from tubular to vascular ***,we will discuss specific applications,limitations,and future perspectives of fabricated BMs.

关键词： Blood organs printing

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Mixed-Reality Simulator for Analysis of Interactions between Humans and Crawler Cranes 13

Mixed-Reality Simulator for Analysis of Interactions between...

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Joint 13th International Conference on Soft Computing and Intelligent systems and 25th International Symposium on Advanced Intelligent systems, SCIS and ISIS 2024

作者： Yamanobe, Kenta Yokota, Kazuya Uenoyama, Daigo Fujiura, Daisuke Ogura, Masataka Takahashi, Kengo Abe, Masajiro Nagaoka University of Technology Master's Program in Mechanical Engineering Nagaoka Japan Nagaoka University of Technology Department of Mechanical Engineering Nagaoka Japan Nagaoka University of Technology Bachelor's Program in Mechanical Engineering Nagaoka Japan Nagaoka University of Technology Center for Integrated Technology Support Nagaoka Japan Nagaoka University of Technology Department of System Safety Engineering Nagaoka Japan

ISBN: (纸本)9798350373332

Crawler cranes are used in various applications, including plant construction and civil engineering. However, accidents caused by hazardous events, such as overturning the entire body or overshadowing of a suspended load, can be problematic. Because crawler cranes are large and powerful machines, simulators are required to analyze the relationship between such hazardous events and human operations. This study proposed a framework for a mixed-reality simulator to analyze the interactions between humans and crawler cranes. This framework combined the high-performance graphics capabilities of Unreal Engine 5 with the high-precision multibody dynamics analysis of MATLAB Simscape to create a visually and physically realistic simulation. Moreover, the quantification of the decision-making process was possible based on the eye-tracking information of the operator. This study described the implementation of these features and discussed the prospects for human-crawler crane interaction analysis using this simulator. © 2024 IEEE.

关键词： MATLAB

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Quality index design for online monitoring injection molding process 77

Quality index design for online monitoring injection molding...

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77th Annual Technical Conference of the Society of Plastics Engineers, ANTEC 2019

作者： Chen, Jian-Yu Huang, Ming-Shyan Nian, Shih-Chih Tseng, Chien-Chou Bachelor Program of Precision System Design Feng Chia University Taiwan Dept. of Mechanical and Automation Engineering National Kaohsiung University of Science and Technology Taiwan Dept. of Power Mechanical Engineering National Taitung College Taiwan

Quality control is a crucial issue in the injection molding process with target of obtaining a high yield rate and reducing production cost. However, conventional injection molding acts like a black-box in which the flowing behavior of polymer melt within cavities is unseen, and the tuning of process parameters is heavily relied on operators' experience, design of experimental methods, or even trial- and-error. Such approaches are not only time-consuming but also lack of assuring consistent injection molding qualities and quality control is then required. Nowadays with the advance of sensing technology, many sensors are available to detect the flowing behavior of polymer melt within mold cavities. Particularly the pressure, velocity, and temperature that affect the flowing ability of polymer melt can be detected in time. In other words, injection molding now has been transformed into a grey-box and a scientific viewpoint to tune process parameters can be realized. In this research, a quality index extracted from pressure profile is aimed for online quality monitoring. In addition, the clamping force increment quality index extracted from the tie-bar elongation which is detected by strain gauges attached on tie bars, free of invading injection mold structure, is paid much attention. To verify the feasibility of the designed quality index using to prediction the injection molded quality, varying barrel temperature, back pressure and rotational speed of plasticizing screw those can affect the plasticizing quality of raw materials are conducted in this investigation. Experimental results reveals that the clamping force increment as well as pressure peak index extracted from injection system pressure, nozzle pressure, end-of-filling cavity pressure profiles during injection molding are highly correlated with injection-molded qualities and thereby are feasible to be a good quality indicator. © 2019 Society of Plastics Engineers. All rights reserved.

关键词： Polymer melts

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Tie-bar elongation based prediction of injection molding quality 77

Tie-bar elongation based prediction of injection molding qua...

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77th Annual Technical Conference of the Society of Plastics Engineers, ANTEC 2019

作者： Huang, Ming-Shyan Nian, Shih-Chih Chen, Jian-Yu Dept. of Mechanical and Automation Engineering National Kaohsiung University of Science and Technology Taiwan Dept. of Power Mechanical Engineering National Taitung College Taiwan Bachelor Program in Precision System Design Feng Chia University Taiwan

Filling-to-packing switchover (also called as V/P switchover) is critical for assuring injection molding quality. An improper filling-to-packing switchover setting may result in various defects of injection-molded parts, such as excessive residual stress, flash, short shot, and warpage, etc. To enhance consistent molding quality, recent V/P switchover approach applies cavity pressure profiles requiring sensors embedded in mold cavities, which is invasive to mold cavities and even expensive. Instead of using cavity pressure sensors, this study thereby proposes a novel approach of identifying ideal V/P switchover timing using a tie-bar elongation profile. In this investigation, a dumbbell testing specimen mold is applied to experimentally verify the feasibility of the proposed method. The results showthat the mold filling and packing stages can be observed along the tie-bar elongation profile detected by mounting strain gauges on tie bars. Moreover, the varying process parameter settings including injection speed, filling-to-packing switchover point, and holding pressure, can be reflected in these profiles. By extracting their characteristics, the decision of filling-to-packing switchover is proved to be realistic. © 2019 Society of Plastics Engineers. All rights reserved.

关键词： Filling

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Evaluation of the Power Output Performance Improvement of a 2 MW Wind Turbine 3

Evaluation of the Power Output Performance Improvement of a ...

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3rd International Conference on Inventions, ICI 2017

作者： Liu, Jui-Hung Chen, Jien-Chen Lai, Wen-Jhen Su, Wei-Niam Mechanical Engineering Dept. Southern Taiwan University of Science and Technology Taiwan Green Energy and Environment Lab. Industrial Technology Research Institute Taiwan Mechanical and System Engineering Program Institute of Nuclear Energy Research Taiwan

This paper shows the possibility of the output improvement to a large wind turbine, so the operator can earn more and thus reduce the overall cost of energy. For a modern wind turbine certificated by IEC or DNV-GL guidelines, a 20 years design lifetime is a base line. However, the efficiency of the turbine will degrade after 8 or 9 years' operating. Some components, especially the turning blade, the efficiency may vary due to the surface condition change. Meanwhile, the controller technology may also have been improved after years. So, the turbine can regain its original output or even have a better output performance through some adjustments. In this paper, a 2 MW wind turbine with different design and operating parameters like blade efficiency, wind direction alignment, high/low wind control strategy has been evaluated, then with the software DNV-GL BLADED simulation, to calculate the output differences and availability of the turbine. The result shown that a 3~5% yield annually can be obtained for each improved parameter in a 9 m/s mean wind speed situation. © The Authors, published by EDP Sciences, 2018.

关键词： Wind turbines

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Enhancing the interlaminar shear strength of unidirectional carbon fiber reinforced plastic (CFRP) laminate using a nanofiber Z-threading strategy 5

Enhancing the interlaminar shear strength of unidirectional ...

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5th Annual Composites and Advanced Materials Expo, CAMX 2018

作者： Kirmse, Sebastian Hsiao, Kuang-Ting University of South Alabama Department of Mechanical Engineering 150 Jaguar Drive Shelby Hall MobileAL36608 United States System Engineering Program Department of Mechanical Engineering 150 Jaguar Drive Shelby Hall MobileAL36608 United States

Traditional carbon fiber reinforced plastic (CFRP) laminates without z-directional fiber-reinforcement are vulnerable to matrix-sensitive damages including the interlaminar shear failure. It was hypothesized that long carbon nanofibers (CNFs) zig-zag thread through multiple layers of carbon fibers along the z-direction could form an interlocked multiscale fiber-reinforcement network, therefore, enhance the interlaminar shear strength (ILSS) of the CNF z-threaded CFRP laminate. To find the answer, the "Double-Notch Shear Test" (ASTM D3846) was performed on the CNFs z-threaded unidirectional CFRP laminates. The CNFs z-threaded CFRP prepreg was manufactured by flow-transferring a resin film, containing 1 wt% electrical-field-aligned CNFs, into a dry unidirectional carbon fabric. The prepregs were stacked and cured into a laminate using an Out Of Autoclave-Vacuum Bag Only (OOA-VBO) process. Benchmarked with the ILSS of the control CFRP laminates, the CNF z-threads added a statistically substantial improvement to the CFRPs with an increased mean by +35.15 % and a reduced uncertainty (i.e., coefficient of variation) by -47.56 %. Oppositely, unaligned CNFs added to CFRPs yielded a negligible change in the mean and a substantially worse uncertainty. A microscopic morphology study was performed on the CNFs z-threaded CFRPs to understand the roles of the CNF z-threads in the interlaminar shear fracture mechanism. © 2018. Used by CAMX - The Composites and Advanced Materials Expo. CAMX Conference Proceedings. Dallas, TX.

关键词： Carbon nanofibers

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Peristaltic PDMS pump with perfect dynamic valves for both gas and liquid

Peristaltic PDMS pump with perfect dynamic valves for both g...

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19th IEEE International Conference on Micro Electro mechanical systems

作者： Jeong, Ok Chan Morimoto, Takashi Watanabe, Yuusaku Konishi, Satoshi Center of Promotion of the COE Program Ritsumeikan University Japan Department of Mechanical Engineering Ritsumeikan University Japan Department of Micro System Technology Ritsumeikan University Japan

ISBN: (纸本)0780394755

This paper presents for the first time experimental results on the peristaltic PDMS pump with perfect dynamic valves for both gas and liquid. Micropump consists of the three peristaltic-type actuators and the micro channel connecting with chambers and the inlet/outlet port. Micropump is fabricated by SU8 mold process and the two-step curing process for the irreversible bonding of PDMS layers. The diameter and the thickness of the actuator diaphragm are 1 mm and 98 μm, respectively. The total size of micro pump is about 5 mm × 5.5 mm. The dynamic gas and liquid valve actions of the single actuator are observed to verify effect of the fluidic mass and viscosity of the working fluid. Perfect peristaltic motions and robust pumping actions of the micro pump are confirmed by the flowrate test of micropump with the air and the ink. ©2006 IEEE.

关键词： Pumps

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All PDMS pneumatic balloon actuators for bidirectional motion of micro finger

All PDMS pneumatic balloon actuators for bidirectional motio...

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18th IEEE International Conference on Micro Electro mechanical systems, MEMS 2005 Miami

作者： Jeong, Ok Chan Kusuda, Shinya Konishi, Satoshi Center of Promotion of the COE Program Ritsumeikan University Japan Department of Mechanical Engineering Ritsumeikan University Japan Department of Micro System Technology Ritsumeikan University Japan

This paper decribes design, fabrication, and chracteristics of all PDMS (Polydimethylsiloxane) pneumatic balloon actuators for the bidirectional motion of the microfinger. The actuation mechanism of the balloon actuator is based on pressure-dependent swelling and saturation phenomena of two flexible diaphragms with different thicknesses. Two types of microfingers with balloon actuators are fabricated by the simple silicon molding process and pneumatically tested. From the pneumatic test result, it is confirmed that the out-of-plane motion of the microfinger depends on the thickness of the bottom diaphragm of pneumatic balloon actuators. When the applied pressure is 50 kPa, the generated force and the bending angle of Type A finger are 0.17 mN and 59°, respectively. © 2005 IEEE.

关键词： Pneumatic equipment

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