On the Nature of the Transport Factor Component TFship

2001 ◽  
Vol 38 (02) ◽  
pp. 106-114
Author(s):  
Colen Kennell
Keyword(s):  
Transport Properties ◽  
Empirical Model ◽  
High Speed ◽  
Factor Analyses ◽  
Transport Factor ◽  
Displacement Monohulls

This paper presents a revised empirical model for TFship, the Transport Factor component related to empty ship weight. Empty ship weight is shown to be dependent on a ship volume parameter, "deadweight density," that relates the sum of cargo and fuel weight to the sum of cargo and fuel volume. The revised model is compatible with Transport Factor analyses that assess transport properties of ship types of interest for high-speed sealift. Applicability is limited to displacement and semi-displacement monohulls and catamarans.

On the Nature of the Transport Factor Component TF fuel

2010 ◽  
Vol 47 (01) ◽  
pp. 59-64
Author(s):  
Colen Kennell
Keyword(s):  
Transport Properties ◽  
Fuel Consumption ◽  
High Speed ◽  
Consumption Rate ◽  
Fuel Efficiency ◽  
Factor Analyses ◽  
Full Load ◽  
Fuel Consumption Rate ◽  
Transport Factor ◽  
Insight Into

This paper presents insight into the structure of TFfuel, the Transport Factor component related to the weight of fuel needed to meet a ship's endurance requirement. TFfuel is shown to be dependent on the required range and the specific fuel consumption rate of the machinery while being independent of installed power and speed. The effect of operating ships at less than full-load displacement to increase fuel efficiency is illustrated. The results are compatible with Transport Factor analyses that assess transport properties of ship types of interest for high-speed sealift such as displacement and semi-displacement monohulls and multihulls.

Cutting Force Empirical Model of High-Speed Precision Hard Cutting GCr15

2009 ◽  
Vol 69-70 ◽  
pp. 301-305
Author(s):  
Jing Shu Hu ◽  
Yuan Sheng Zhai ◽  
Fu Gang Yan ◽  
Yu Fu Li ◽  
Xian Li Liu
Keyword(s):  
Cutting Force ◽  
Empirical Model ◽  
High Speed ◽  
Orthogonal Design ◽  
Cutting Speed ◽  
Least Square Method ◽  
Cutting Parameters ◽  
Least Square ◽  
Physical Parameters ◽  
Hard Cutting

In the cutting process, cutting force is one of the important physical parameters, which affects the generation of cutting heat, tool life and surface precision of workpiece directly. In this paper an orthogonal design of experiment and subsequent data is analyzed using high speed finish hard cutting GCr15 whose hardness is 65HRC. Cutting speed is 200-400m/min, to study the influence of cutting parameters on cutting force, cutting force empirical model has obtained from least square method.

Design Trends in High-Speed Transport

1998 ◽  
Vol 35 (03) ◽  
pp. 127-134 ◽  
Author(s):  
Colen Kennell
Keyword(s):  
Transport Properties ◽  
High Speed ◽  
Speed Range ◽  
Design Characteristics ◽  
Parametric Relationships

This paper presents a method for analyzing transport properties of competing ship types of interest for high speed commercial transport. Simple parametric relationships link requirements (speed, range, and cargo weight) to design characteristics (installed power, ship weight, and fuel weight) for conventional and unconventional hull designs. These design trends are supported by data for a variety of ship types (monohull, catamaran, SES, hydrofoil, airship, ekranoplan) either currently or formerly in service. While the method is inherently general, the data selected is focused on large ships capable of transporting heavy cargos over trans-oceanic distances at speeds of 40–100 knots.

Research on Machined Surface Quality for High Speed Turning Titanium Alloy Membrane Discs and Optimization of Cutting Parameters

2010 ◽  
Vol 33 ◽  
pp. 246-250
Author(s):  
Wei Zhang ◽  
Min Li Zheng ◽  
Ming Ming Cheng ◽  
Wen Yong Shi
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Empirical Model ◽  
High Speed ◽  
Cutting Parameters ◽  
Machined Surface ◽  
Cutting Parameter ◽  
High Speed Turning ◽  
Machined Surface Roughness ◽  
Cutting Parameter Optimization

By high speed turning experiment of aerospace engine titanium alloy membrane discs, it researches cutting parameters influence on machined surface roughness of titanium alloy membrane discs, meanwhile measures and analyzes machined surface topography. Machined surface roughness multi-linear regression empirical model of high speed end-surface turning titanium alloy membrane discs is established. Using cutting parameter combination obtained from cutting parameter optimization makes process verification experiment of high speed turning titanium alloy membrane discs. The results show that the established machined surface roughness empirical model of high speed turning titanium alloy membrane discs is credible in statistics, and the process verifying experiment effect is good by using optimized cutting parameters.

Transport Properties of Insulated Gate AlInN/InN Heterojunction Field Effect Transistor

2011 ◽  
Vol 403-408 ◽  
pp. 64-69
Author(s):  
Md. Sherajul Islam ◽  
Md. Arafat Hossain ◽  
Sakib Mohammed Muhtadi ◽  
Ashraful G. Bhuiyan
Keyword(s):  
Transport Properties ◽  
Field Effect ◽  
High Speed ◽  
Field Effect Transistor ◽  
Phonon Scattering ◽  
Impurity Scattering ◽  
Interface Roughness ◽  
Electron Transport Properties ◽  
Effect Transistor ◽  
Alloy Disorder

As a promising candidate for future high speed devices InN-based heterojunction field effect transistor (HFET) has gained a lot of attention in recent years. However, InN-based devices are still a less studied compared with other III-nitride based devices. This work investigates theoretically, the electron transport properties of insulated gate AlInN/InN Heterojunction Field Effect Transistor. A self-consistent charge control model based on one-dimensional Schrodinger-Poisson equations is developed. The transport properties of the device are calculated using an ensemble Monte Carlo simulation. The device model incorporates an analytical 3-valley band structure with non-parabolicity for all nitride materials. The scattering mechanisms considered are dislocations scattering, impurity scattering, interface roughness, alloy disorder scattering and phonon scattering. The model also takes into account the highly dominant spontaneous and piezoelectric polarization effects to predict the 2DEG sheet charge density more accurately at the heterointerface. The results obtained are agreed well with the literature.

A Model for Milling Force Prediction in High-Speed End Milling of P20 Mold Steel

2006 ◽  
Vol 315-316 ◽  
pp. 856-859 ◽  
Author(s):  
Jun Zhao ◽  
Xing Ai ◽  
Su Yu Wang ◽  
Zeng Wen Liu
Keyword(s):  
Empirical Model ◽  
High Speed ◽  
End Milling ◽  
Regression Coefficients ◽  
Depth Of Cut ◽  
Affecting Factors ◽  
Milling Force ◽  
Machining Center ◽  
Radial Depth ◽  
Milling Forces

This paper focuses on developing an empirical model for the prediction of milling forces in high-speed end milling of P20 die-mold steel. The spindle speed, feed rate, axial and radial depth of cut are considered as the affecting factors. The data for establishing the model are derived from high-speed end milling experiments conducted on a 5 axis machining center according to the principles of DOE (design of experiments) method. The influences of milling parameters on milling forces are investigated by analyzing the experimental curves. Consequently, multiple-regression analysis is applied in developing the empirical model. Furthermore, the significances of the regression equation and regression coefficients are statistically tested in this paper to validate the model.

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