Now showing items 91-100 of 110
Probabilistic Torsional Vibration Analysis of a Marine Diesel Engine Shafting System: The Level Crossing Problem
(ASME, 1989-12)
A probabilistic approach to the torsional vibration problem of a marine diesel engine shafting system has been developed. In this analysis, the shafting shear stress is found to be a Gaussian, harmonizable cyclostationary ...
Note on the modified two-stream approximation of sagan and pollack
(Elsevier, 1973-06)
The modified two-stream approximation is derived from the radiative transfer equation using a two-point gaussian quadrature and neglecting terms of order l [ges] 3 in the Legendre expansion of the phase function. The results ...
Pressure and temperature-based adaptive observer of air charge for turbocharged diesel engines
(John Wiley & Sons, Ltd., 2004-04)
In this paper we design an adaptive air charge estimator for turbocharged diesel engines using intake manifold pressure, temperature and engine speed measurements. This adaptive observer scheme does not depend on mass air ...
A finite element analysis of beams on elastic foundation including shear and axial effects
(Elsevier, 1987)
A displacement finite element method for analyzing a beam on continuous elastic foundation is presented. A three-dimensional model which accounts for the effects of both the Filonenko-Borodich and Pasternak foundation ...
Instantaneous and time-averaged flow fields of multiple vortices in the tip region of a ducted propulsor
(Springer-Verlag, 2005-05)
The instantaneous and time-averaged flow fields in the tip region of a ducted marine propulsor are examined. In this flow, a primary tip-leakage vortex interacts with a secondary, co-rotating trailing edge vortex and other ...
Second Order Statistics and Discrete-Time Detection Modeling for Partially Saturated Processes
(Acoustical Society of America, 1985-03)
The basic problem in underwater detection is formulated under the general assumptions of partially saturated propagation of narrow‐band and acoustic signals. Expressions for the joint probability density function (PDF) of ...
In situ force-balance tensiometry
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1999-07)
Although a fundamental physical parameter, surface tension is difficult to measure. Common tensiometry inaccuracy comes from failure to control air–liquid–solid contact conditions, or account for liquid meniscus geometry ...
Redesign of marine structures by perturbation
(Elsevier, 1988)
Finite element (FE) methods are extensively used for analysis of static and dynamic behavior of marine structures. Often predicted response is unacceptable from the point of view of design or operation. Improvement of ...
Invariant and consistent redundancy by large admissible perturbations
(Elsevier, 1992)
Structural perturbation theory has been developed over the past 16 years to relate two structural states modeled by the same Finite Element (FE) model but described by different values of the design variables. Relating an ...
Full scale wake and boundary layer instrumentation feasibility study
(Elsevier, 1980)
Fluid-flow measuring devices intended for full scale use were designed and tested. One device consisted of a rake supporting different types of pitot tubes. This will be used to obtain a velocity profile of the boundary ...