Flexural Critical Speeds of a Two-Rotor Bearing System With One Overhang

1991 ◽  
Author(s):  
C. Y. Chow ◽  
I-Chih Wang ◽  
Rae Chow
Keyword(s):  
Software Package ◽  
Parametric Analysis ◽  
Turbine Unit ◽  
Wide Spectrum ◽  
Industrial Applications ◽  
Power Train ◽  
Trade Off ◽  
Critical Speeds ◽  
Commercial Software Package ◽  
Bearing System

Abstract Power-train arrangements, such as a two-rotor system with one overhang, have a wide spectrum of industrial applications, from a workbench grinder to compressor-turbine unit. Based on a typical dimension, flexural critical speeds both in the forward and backward whirl are calculated by a commercial software package. These critical speeds are further analyzed by varying the shaft overhung, rotor inertia and gyroscopic effect. Parametric analysis would enable designers to make a trade-off study and obtain a satisfactory operation. In extreme conditions, results obtained have been verified with available analytical solutions.

scholarly journals Parametric Analysis of Tube during Bending Operation

2019 ◽  
Vol 8 (10) ◽  
pp. 1793-1799
Keyword(s):  
Software Package ◽  
Parametric Analysis ◽  
Air Conditioning ◽  
Industrial Applications ◽  
Furniture Industry ◽  
Bending Angle ◽  
Shipbuilding Industry ◽  
Material Deformation ◽  
Bending Process ◽  
Bending Radius

Bent tubes have a lot of various industrial applications. It is required for the transportation of fluids or gases. It also used as construction elements in all industries like car, aviation and shipbuilding industry, refrigeration and air conditioning technology, furniture industry. The objective of this paper is to understand the material deformation occurring during the bending of the tube bends and study the effect of parameters viz. bending radius, bending angle, springback on ovality of tube during bending operation. Tube undergoes certain deformation during the bending process which introduces various defects in the tube bends. This will lead the acceptability of tube bends for certain application. For better understanding the approximation of the defect it is necessary to reduce it at the manufacturing level itself. The testing uses different bending die to differ the bending radius and tests are performed at different bending angle. These whole data has been used to find the different defects and also to find the stress induced in the bends using FEA software package.

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

scholarly journals Modelling of hydrodynamic cavitation for treatment of wastewater in a Venturi tube

2020 ◽  
Vol 14 (1) ◽  
pp. 61-66
Author(s):  
Betti Bolló
Keyword(s):  
Software Package ◽  
Venturi Tube ◽  
Hydrodynamic Cavitation ◽  
Ansys Fluent ◽  
High Effectiveness ◽  
Commercial Software Package ◽  
Promising Application ◽  
Low Costs ◽  
Modern Technologies ◽  
Degradation Of Pollutants

Treatment of municipal effluents has long been a challenge for modern technologies combining high effectiveness of degradation of pollutants with low costs of the process. Hydrodynamic cavitation is a promising application in wastewater treatment due to its simple reactor design. In this work, for a system available in the laboratory a hydrodynamic reactor is designed based on literature recommendations. On the designed Venturi tube, two-dimensional numerical simulations were investigated by the means of CFD computations using the commercial software package, Ansys Fluent. The resulting cavitation bubbles were analysed at different inlet pressures.

Numerical Simulations of Particle-Laden Flow Based on Given Friction Reynolds Number and Mean Reynolds Number Respectively

2014 ◽  
Author(s):  
Zhenzhong Li ◽  
Jinjia Wei ◽  
Bo Yu
Keyword(s):  
Numerical Simulation ◽  
Reynolds Number ◽  
Direct Numerical Simulation ◽  
Wide Spectrum ◽  
Natural World ◽  
Industrial Applications ◽  
Particle Parameters ◽  
The Mean ◽  
The Difference ◽  
Particle Laden Flow

Multiphase flow with particles covers a wide spectrum of flow conditions in natural world and industrial applications. The experiments and the direct numerical simulation have become the most popular means to study the dilute particle-laden flow in the last two decades. In the experimental study, the mean Reynolds number is often adjusted to the value of single-phase flow for each set of particle conditions. However, the friction Reynolds number usually keeps invariable in the direct numerical simulation of the particle-laden flows for convenience. In this study the effect of the difference between given mean Reynolds number and friction Reynolds number was investigated. Two simulations were performed for each set of particle parameters, and the mean Reynolds number and friction Reynolds number were kept invariant respectively. From the results it can be found that the turbulence intensity and the dimensionless velocities are larger when keeping the friction Reynolds constant. And the results calculated from the cases of keeping the mean Reynolds number invariable agree with the experiment results better. In addition, the particle distribution along the wall-normal coordinate was found to be unchanged between two simulation conditions. As a suggestion, keeping the same mean Reynolds number in the direct numerical simulation of particle-laden flow is more appropriate.

scholarly journals Changes in Phenolics and Fatty Acids Composition and Related Gene Expression during the Development from Seed to Leaves of Three Cultivated Cardoon Genotypes

Antioxidants ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 1096
Author(s):  
Giulia Graziani ◽  
Teresa Docimo ◽  
Monica De Palma ◽  
Francesca Sparvoli ◽  
Luana Izzo ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Wide Spectrum ◽  
Sustainable Use ◽  
Fatty Acid Desaturase ◽  
Value Added ◽  
Industrial Applications ◽  
Transcriptional Analysis ◽  
Total Phenols ◽  
Superior Genotypes

Cultivated cardoon (Cynara cardunculus var. altilis) has long been used as a food and medicine remedy and nowadays is considered a functional food. Its leaf bioactive compounds are mostly represented by chlorogenic acids and coumaroyl derivatives, known for their nutritional value and bioactivity. Having antioxidant and hepatoprotective properties, these molecules are used for medicinal purposes. Apart from the phenolic compounds in green tissues, cultivated cardoon is also used for the seed oil, having a composition suitable for the human diet, but also valuable as feedstock for the production of biofuel and biodegradable bioplastics. Given the wide spectrum of valuable cardoon molecules and their numerous industrial applications, a detailed characterization of different organs and tissues for their metabolic profiles as well as an extensive transcriptional analysis of associated key biosynthetic genes were performed to provide a deeper insight into metabolites biosynthesis and accumulation sites. This study aimed to provide a comprehensive analysis of the phenylpropanoids profile through UHPLC-Q-Orbitrap HRMS analysis, of fatty acids content through GC-MS analysis, along with quantitative transcriptional analyses by qRT-PCR of hydroxycinnamoyl-quinate transferase (HQT), stearic acid desaturase (SAD), and fatty acid desaturase (FAD) genes in seeds, hypocotyls, cotyledons and leaves of the cardoon genotypes “Spagnolo”, “Bianco Avorio”, and “Gigante”. Both oil yield and total phenols accumulation in all the tissues and organs indicated higher production in “Bianco Avorio” and “Spagnolo” than in “Gigante”. Antioxidant activity evaluation by DPPH, ABTS, and FRAP assays mirrored total phenols content. Overall, this study provides a detailed analysis of tissue composition of cardoon, enabling to elucidate value-added product accumulation and distribution during plant development and hence contributing to better address and optimize the sustainable use of this natural resource. Besides, our metabolic and transcriptional screening could be useful to guide the selection of superior genotypes.

Calculations of intensities for radiation force modeling with the commercial software package FOCUS.

2010 ◽  
Vol 127 (3) ◽  
pp. 1828-1828
Author(s):  
Robert J. McGough ◽  
Donald J. Vanderlaan ◽  
Alexander Dutch ◽  
Matthew W. Urban
Keyword(s):  
Software Package ◽  
Radiation Force ◽  
Commercial Software ◽  
Force Modeling ◽  
Commercial Software Package

Optimization of composite leaf spring for reduced weight and improved noise, vibration, and harshness in an electric vehicle

2020 ◽  
Vol 51 (7-9) ◽  
pp. 127-138
Author(s):  
Smaranika Nayak ◽  
Jatin Sadarang ◽  
Isham Panigrahi ◽  
Ramesh Kumar Nayak ◽  
Manisha Maurya
Keyword(s):  
Composite Material ◽  
Stress Concentration ◽  
Glass Fiber ◽  
Electric Vehicle ◽  
Software Package ◽  
Research Work ◽  
Leaf Spring ◽  
Corrosion Resistant ◽  
Commercial Software Package ◽  
Noise Vibration

In automobiles suspension system, laminated springs are widely used for the absorption of shock and vibration. These laminated springs account for approximately 10%–20% of the unsprung weight of the vehicle. It has been found that composite material is used to reduce the weight of the vehicle in order to obtain better efficiency. Therefore, in the current research work, composite material is used for the fabrication of laminated spring. Among the various types of glass fiber available, the C-glass fiber has been widely used due to its better corrosion resistant property. Commercial software package ANSYS is used to optimize the composite-laminated spring. The optimized leaf spring is then fabricated by the hand layup method. It was found that the spring with composite graduated leaf resulted in 40% reduction in weight than the spring with steel graduated leaf. Similarly, the stress concentration and deformation values are reduced by 76.39% and 50% in comparison with those of steel graduated leaf. The composite-laminated spring showed better damping property and also resulted in less transmission of force to the chassis of the vehicle. The noise induced by the composite-laminated spring is also reduced in comparison with steel graduated leaf. Finally, a composite-laminated spring is found to be lighter in weight and with better noise, vibration, and harshness in comparison with steel graduated leaf. Thus, it is found to be best suited for an electric vehicle.

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