scholarly journals Effects of Design Factors on Drag Forces and Deformations on Marine Aquaculture Cages: A Parametric Study Based on Numerical Simulations

2020 ◽  
Vol 8 (2) ◽  
pp. 125 ◽  
Author(s):  
Shuchuang Dong ◽  
Xinxing You ◽  
Fuxiang Hu
Keyword(s):  
Additive Model ◽  
Design Parameters ◽  
Marine Aquaculture ◽  
Drag Forces ◽  
Solidity Ratio ◽  
Parametric Studies ◽  
Net Cage ◽  
Fast Prediction ◽  
Bp Neural Network Model ◽  
Design Factors

In Japan, the marine aquaculture net cage has an important role in farming pacific bluefin tuna farming in oceans, and the design of the net cage needs to ensure robustness against hostile oceanic conditions. Accordingly, this study focuses on the drag forces and the cage volume of the net cage, and on their variations induced by different design parameters (netting solidity ratio, netting height, and bottom weight). A series of parametric studies on drag force and deformation of the net cage was conducted using a numerical simulation model. Accordingly, the contribution of each parameter to the drag and volume was analyzed using a generalized additive model. The results indicate that the bottom weight had the highest contribution to the holding ratio of the cage volume, whereas the netting height had the highest contribution to the drag coefficient of the net cage. Finally, a fast prediction model was created by a backpropagation (BP) neural network model and was examined for the accurate prediction of the objective variables.

Model tests and full-scale sea trials for drag force and deformation of a marine aquaculture net cage

2021 ◽  
Vol 240 ◽  
pp. 109941
Author(s):  
Shuchuang Dong ◽  
Sang-gyu Park ◽  
Daisuke Kitazawa ◽  
Jinxin Zhou ◽  
Takero Yoshida ◽  
...  
Keyword(s):  
Drag Force ◽  
Model Tests ◽  
Full Scale ◽  
Marine Aquaculture ◽  
Net Cage

scholarly journals Office employee satisfaction: the influence of design factors on psychological user satisfaction

Facilities ◽  
2019 ◽  
Vol 38 (1/2) ◽  
pp. 1-19 ◽  
Author(s):  
Minyoung Kwon ◽  
Hilde Remøy
Keyword(s):  
The Netherlands ◽  
User Satisfaction ◽  
Work Performance ◽  
Online Survey ◽  
Design Parameters ◽  
Content Type ◽  
Employees Satisfaction ◽  
Office Layouts ◽  
The Impact ◽  
Design Factors

Purpose Employees’ satisfaction and productivity is one of the main interests of employers. Psychological comfort can cause dissatisfaction with their work. Thus, it is important to understand what factors contribute to employees’ satisfaction in workplaces. The purpose of this paper is to identify the weight of contribution of each design parameter on increasing psychological satisfaction. Design/methodology/approach The study included 579 employees in five offices in The Netherlands through an online survey. The typologies of offices vary in terms of office layouts, orientations and façade. Additionally, a parameter of desk location was included as this factor may be associated with user satisfaction. Kruskal–Wallis H test, categorical regression, and logistic regression analyses were performed to examine the impact of these design parameters on psychological user satisfaction. Findings The results revealed the impact of design parameters on the psychological satisfaction. The parameters of office layouts and desk locations were the significant predictor factors for the probability of satisfaction variables (e.g. privacy, concentration, communication, social contact and territoriality). The parameters for optimal satisfaction were found in cellular office, north-west oriented workstation and 4 m away from a window. Originality/value Psychological comfort is an inevitable aspect in user satisfaction studies. This paper, therefore, measures and predicts the relationship between design factors and employees’ satisfaction through case studies in The Netherlands. The findings help designers, architects, planners and facility managers to develop user-focussed office design principles supporting employees’ work performance.

Thermal Analysis of MEMS Actuator Performance

2007 ◽  
Author(s):  
Harita Machiraju ◽  
Bill Infantolino ◽  
Bahgat Sammakia ◽  
Michael Deeds
Keyword(s):  
Power Reduction ◽  
Silicon On Insulator ◽  
Design Parameters ◽  
Experimental Measurements ◽  
Device Layer ◽  
Conduction Path ◽  
Element Analysis ◽  
Parametric Studies ◽  
Actuator Performance ◽  
Good Agreement

A MEMS based device consisting of microactuators was modeled using finite element analysis. The temperature profile of the complete package was obtained and compared to experimental measurements. Good agreement was found between the modeling and measurements. Parametric studies of potential design parameters of the chip package to decrease the power requirements to the actuators have been studied. Increasing the gap between the handle layer and the device layer of the SOI (silicon on insulator) chip from 2 to 3 microns resulted in a reduction of 10% (0.2 Watts) per beam of the actuator. A glass top chip proved to be better at reducing the power requirements for the actuators when compared to a silicon top chip. Modeling shows that relief cuts in the substrate had a larger effect on the power reduction compared to those on the top chip since the heat conduction path to the substrate is a lower resistance path. The power reduction was as high as 50% (1.1 Watts) per beam of the actuator, when the relief cut in the substrate was 50 microns.

The Deresination of Guayule: A Physical Model. Part II: A Two-Component Analog for Deresination

1984 ◽  
Vol 57 (2) ◽  
pp. 370-378
Author(s):  
S. Budiman ◽  
D. McIntyre
Keyword(s):  
Diffusion Coefficients ◽  
Abietic Acid ◽  
Additive Model ◽  
Molecular Size ◽  
Design Parameters ◽  
Model Compounds ◽  
Diffusion Behavior ◽  
Diffusion Studies ◽  
Two Component ◽  
Physical Geometry

Abstract Based on GPC, the worm resin can be separated into two distinct groups, large and small. To obtain the overall diffusion coefficients for the two groups that could be useful as commercial design parameters, the worms were converted into wet worm crepe. Diffusion studies with model compounds, abietic acid, and trilinolein, reveal that: (a) their diffusion coefficients for desorption into acetone are inversely proportional to their respective molecular size, (b) the diffusion behavior of the two model compounds in a mixture can be fitted to a simple additive model, and (c) their diffusion coefficients are quite similar to those of the two groups of resin constituents (large and small). It is, therefore, possible to model and optimize a commercial deresination process for guayule worms on the basis of the diffusion behavior of two model compounds linolein and abietic acid and the physical geometry.

scholarly journals Aerodynamic Performance of Biomimicry Snake-Shaped Airfoil

2019 ◽  
Vol 9 (2) ◽  
pp. 3319-3323
Keyword(s):  
Cross Section ◽  
Lift Coefficient ◽  
Design Parameters ◽  
Drag Forces ◽  
Cross Section Shape ◽  
Section Shape ◽  
Wide Range ◽  
Lift And Drag ◽  
Drag Ratio ◽  
Lift To Drag Ratio

The cross-section shape and proportionality between geometrical dimensions are the most important design parameters of any lifting surfaces. These parameters affect the amount of the aerodynamic forces that will be generated. In this study, the focus is placed on the snake-cross-section airfoil known as the S-airfoil. It is found that there is a lack of available researches on S-airfoil despite its important characteristics. A parametric study on empty model of the S-airfoil with a cross-section shape that is inspired by the Chrysopelea paradise snake is conducted through numerical simulation. Simulation using 2D-ANSYS FLUENT17 software is used to generate the lift and drag forces to determine the performance of airfoil aerodynamic. Based on the results, the S-airfoil can be improved in performance of aerodynamic by reducing the thickness at certain range, whereby changing the thickness-to-chord ratio from 0.037 to 0.011 results in the increment of lift-to-drag ratio from 2.629 to 3.257. On other hand, increasing the height-to-chord ratio of the S-airfoil will increase maximum lift coefficient but drawback is a wide range of angles of attack regarding maximum lift-to-drag ratio. Encouraging results obtained in this study draws attention to the importance of expanding the research on S-airfoil and its usage, especially in wind energy.

scholarly journals IPTEK MARIKULTUR BAGI KELOMPOK PEMBUDIDAYA IKAN DESA MOTANDOI SELATAN KECAMATAN PINOLOSIAN TIMUR KABUPATEN BOLAANG MONGONDOW SELATAN

2019 ◽  
Vol 7 (3) ◽  
pp. 256
Author(s):  
Carolus P Paruntu ◽  
Suria Darwisito ◽  
Antonius P Rumengan ◽  
Hengky J Sinjal ◽  
Billy Wagey ◽  
...  
Keyword(s):  
Marine Fish ◽  
Financial Management ◽  
Education And Training ◽  
Marine Aquaculture ◽  
Long Time ◽  
Group Members ◽  
Net Cage ◽  
Net Cages ◽  
Fish Harvest ◽  
And Training

The purpose of the community partnership program is to increase the capacity of independent and sustainable marine fish farmers groups.  Specific targets are 1) Increasing the quantity and quality of fish products from marine aquaculture in floating net cages, and 2) Enhancing partners' understanding and skills in terms of effective and efficient marine fish aquaculture technology in floating net cages. The main problems recorded, namely: 1) lack of knowledge of marine fish aquaculture technology in floating net cage; 2) fish harvest time that requires a long time, and 3) poor financial management.  To overcome these problems, an approach is carried out through direct education and training, mentoring, and management of fisheries business management in the field to partners.  After that, each trainee in the partner group is given the opportunity until they can do it themselves.  The target that will be achieved at the end of this education and training is that all group members and their families have knowledge of: 1) superior marine fish polyculture technology in floating net cage and 2) good financial management. Keywords: Fish cultivator group, floating net cage, South Motandoi village, financial management, marine fish polyculture technologyAbstrakTujuan program kemitraan masyarakat (PKM) adalah meningkatkan kapasitas kelompok pembudidaya ikan laut yang mandiri dan berkelanjutan. Target khusus adalah 1) peningkatan kuantitas dan kualitas produk ikan hasil budidaya laut dalam karamba jaring apung, dan 2) peningkatan pemahaman dan ketrampilan mitra dalam hal teknologi budidaya ikan laut dalam karamba jaring apung yang efektif dan efisien. Permasalahan utama yang terekam, yaitu: 1) kurang pengetahuan tentang teknologi budidaya ikan laut dalam karamba jaring apung (KJA); 2) waktu panen ikan yang membutuhkan waktu yang lama, serta 3) pengelolaan keuangan yang kurang baik. Untuk mengatasi masalah tersebut dilakukan pendekatan melalui penyuluhan dan pelatihan, pendampingan, dan pendidikan manajemen usaha perikanan secara langsung di lapangan kepada mitra. Setelah itu, setiap peserta pelatihan dalam kelompok mitra tersebut diberikan kesempatan sampai mereka bisa melakukannya sendiri.  Target akhir yang dicapai dalam PKM ini adalah semua anggota kelompok maupun keluarganya mempunyai pengetahuan tentang: 1) teknologi polikultur budidaya ikan laut dalam karamba jaring apung yang unggul, dan 2) manajemen keuangan yang baik.  Kata-kata kunci: Kelompok pembudidaya ikan, karamba jaring apung, Desa Motandoi Selatan, manajemen keuangan, teknologi polikultur ikan laut

An Analytical Investigation of the Impact of Design Parameters on the Performance of Centrifugal Pendulum Vibration Absorbers

2019 ◽  
Author(s):  
Bahadir Sarikaya ◽  
Murat Inalpolat ◽  
Hyun Ku Lee ◽  
Moo Suk Kim
Keyword(s):  
Dynamic Model ◽  
Translational Motion ◽  
Vibration Reduction ◽  
Analytical Investigation ◽  
Design Parameters ◽  
Vibration Absorbers ◽  
Modeling Framework ◽  
Centrifugal Pendulum Vibration Absorbers ◽  
Fast Prediction ◽  
The Impact

Abstract A generalized nonlinear time-varying, planar dynamic model of bifilar centrifugal pendulum vibration absorbers (CPVA) is proposed. This dynamic model enables fast prediction of vibration reduction performance of any CPVA design considering the impact of absorber rollers, gravity, end stops and translational motion of the system. The modeling framework provides comparative, simultaneous simulation results for numerous different design possibilities, and thus can be used to optimize CPVA designs. The dynamic model is generic and can handle N individually designed absorbers on a rotor with numerous path options ranging from circular to cycloid. Absorbers can be designed to be equally or unequally spaced. In this study, first the dynamic model of the bifilar CPVAs is derived. Then, case studies are provided to showcase the capabilities of the modeling framework. Initially, maximum applicable dynamic torque to a CPVA and vibration reduction performance are investigated by considering the effect of tuning order and different absorber path options for different operating speeds. Then, impact of different modelling features on system frequency response and limit dynamic torque is investigated. Interactions between the important design parameters are highlighted. Finally, the influence of end stop positioning on the CPVA dynamic response is illustrated.

Multiphysics Modeling and Parametric Analysis of an Inductor for Heating Thin Sheet Materials

2018 ◽  
Author(s):  
Alex J. Mazursky ◽  
Hee-Chang Park ◽  
Sung-Hyuk Song ◽  
Jeong-Hoi Koo
Keyword(s):  
Induction Heating ◽  
Thin Sheet ◽  
Induction Coil ◽  
Conventional Heating ◽  
Design Parameters ◽  
Coil Design ◽  
Temperature Deviation ◽  
Sheet Materials ◽  
Wide Range ◽  
Parametric Studies

Over the past two decades, induction heating technology has begun to replace conventional heating methods in manufacturing due to its ability to rapidly and uniformly heat conductive materials. This advancement has made induction heating very attractive to a wide range of industries, including applications in which thin sheet geometries are used (sheet thickness < 10 mm). According to preliminary testing, conventional coil geometries cannot efficiently heat thin sheet samples. Thus, the primary goal of this study is to investigate a suitable coil design for thin sheet materials and to evaluate the effects of varying coil design parameters. To this end, this project has developed a 3D Multiphysics model that includes a longitudinal induction coil and a thin sheet workpiece. Using the model, a series of parametric studies have been performed to identify the best induction coil geometry for heating of thin sheets along with suitable excitation parameters for the coil and workpiece. It was found that uniform heating is produced when the space between coils is tight. Additionally, insignificant variance in temperature uniformity was found when vertically displacing the workpiece within the coil. Parametric studies resulted in finding a cross-section geometry that reduced temperature deviation to within 1.1% across the workpiece width. The model can be used as a design tool for developing a (full-scale) prototype induction heating system.

scholarly journals Improving the reliability and service life of the pneumatic distributor for distributing feed to cages

2020 ◽  
Vol 175 ◽  
pp. 03017
Author(s):  
Еvgenii Tihonov ◽  
Valentin Bazykin ◽  
Nikolay Mukhanov
Keyword(s):  
Service Life ◽  
High Reliability ◽  
Effective Area ◽  
Design Parameters ◽  
Radius Of Curvature ◽  
Integral Criterion ◽  
Distribution Process ◽  
Design Factors ◽  
Moving Parts

In this paper, we consider effective delivery of feed to fish cages. The rotary feeders design analysis is performed. Their disadvantages are analyzed. Possible ways to improve reliability are identified: rotor balancing, elimination of moving parts in design. The design of the feeder without moving parts is proposed, which provides the required parameters of feed distribution in cages and at the same time has high reliability and almost unlimited service life. To justify the design parameters of the feeder, we developed design factors that affect the feed distribution process (height of the pipe cut, height of the cone position, radius of curvature of the generatrix), and an integral criterion for evaluating the quality of feed distribution. The integral criterion includes an assessment of the effective area of feed distribution in the cage and its uniformity. A numerical multifactor study was performed and the optimal values of design factors were determined with the maximum value of the integral criterion that determines the efficiency of the feed distribution process. Based on the results of processing the obtained data, the high quality of feed distribution in cages and the prospects of the proposed design of the feeder as a whole were determined.

RELEVANT CODES AND REGULATIONS: EFFECTS ON THE DESIGN OF INDUSTRIAL CONSTRUCTION

2007 ◽  
Vol 13 (3) ◽  
pp. 215-222
Author(s):  
Ahmed Abdallah
Keyword(s):  
Work Environment ◽  
Design Parameters ◽  
Environment Design ◽  
Industrial Construction ◽  
Codes Of Practice ◽  
Industrial Buildings ◽  
Design Law ◽  
Design Factors ◽  
Laws And Regulations

This paper presents the possible effects and restrictions that may arise in the field of industrial construction due to compliance with relevant construction codes and regulations, as well as the ways they can be favourably handled in the design of industrial buildings. Designs should be based primarily on human design factors, while considering the human as the centre of the work environment. Design parameters should be described as a function of both the physical and psychosocial attributes of a person as well as the technical and economical aspects in the design of industrial construction. This paper is an examination of the connection that exists between design law (codes and regulations) and industrial construction. The relevant construction laws and regulations are described, including standards and codes of practice that designing and supervising engineers are obliged to observe. Possible solutions and consequences of development in the production, constructional, and ergonomic field of design are also discussed.

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