In design and fabricate drive shafts with high value of fundamental natural frequency that represented high value of critical speed; using composite materials instead of typical metallic materials could provide longer length shafts with lighter weight. In this paper, multi-objective optimization (MOP) of a composite drive shaft is performed considering three conflicting objectives: fundamental ...

In this paper we propose a robust approach for automatic 3d model acquisition of sewer shafts from survey videos. Images are captured by a specific camera setup which is composed of a downward-looking fisheye-lens camera while lowering it into the shaft. Additionally, an inertial sensor measures rotation around the viewing axis. Our approach is based on Structure from Motion adjusted to the con...

Failures of externally driven compressor crankshafts may sometimes be due to fretting induced fatigue cracks. Fretting is a degradation process which occurs between two faying surfaces where the relative motion between the components is very small. Discoloration, fine o~ide powder, and shallow surface pitting are the definitive signs of fretting and hence relative motion between components. Fra...

The paper presents the investigation results of harmonic periodic axial loads’ influence on stability shaft. Such loads can be appeared during running vessel passing turbulence zones from side propeller to shafting. In shafting, oscillatory motion performed in adjacent part, which is transmitted through coupling due longitudinal movements, periodic, too. Therefore, question such shafts rotation...

At low pressure, ethylene gas consists of single translating and rotating molecules and behaves as an ideal gas. With decrease of free volume by compression, various rotating supramolecular particles are formed, which require less space for the movement: molecular pairs, bimolecules and oligomolecules. The appearance of a new kind of particles is manifested as a phase transition of the second o...

The vibrational behaviour of misaligned rotating machinery is described and analysed in this paper. model, constructed based on the equations vehicle dynamics, considered dynamic excitation a single Hooke’s joint. system adopted breathing functions from recent publication to approximate actual mechanism cracked driveshaft. study aimed understand transmission nonlinear signal unbalanced drivesha...

The surface of the ciliate Dileptus contains locomotor and sensory domains. Each domain contains cilia of its own kind, arranged in a characteristic pattern. Transformation of a portion of the locomotor area into the sensory domain has been studied. Locomotor ciliary units in the transforming area undergo resorption of ciliary shafts, which are subsequently replaced by shafts of a sensory type....

With the development of highly-deviated well cementing techniques, rotating casing cementing technology has got more and more attention. The rotating casing technique can improve the displacement efficiency of cement paste, and then enhance the quality of well cementation. In the stuck section, the rotating casing can redress the well to make the casing run sequentially. The casing endures shea...

This study examines the capability of the Relevance Vector Machine (RVM) and Multivariate Adaptive Regression Spline (MARS) for prediction of ultimate capacity of driven piles and drilled shafts. RVM is a sparse method for training generalized linear models, while MARS technique is basically an adaptive piece-wise regression approach. In this paper, pile capacity prediction models are developed...

Computer numerical control (CNC) lathes are optimized for machining workpieces into rotating shafts or cylindrical shapes of structures. However, because mechanical parts used on CNC lathes, vibration from spindles, servomotors, hydraulic pumps, and feed screws occurs. Therefore, periodic preventive maintenance is required to minimize vibrations. Additionally, alignment, balance, adjustment ope...