In this paper, the e ect of shaft rotation on its natural frequency is investigated. Considering rotary inertia and gyroscopic momentum, the fourth order di erential equation representing the exural vibration of the shaft is solved by the new analytical method. The Distributed Lumped Modeling Technique (DLMT) is applied to obtain the transfer matrix for the distributed elements using the propos...

Submarine propulsion shafts have demonstrated acceptable reliability performance when inspected and refurbished at least every 6 years. Designers wish to extend the inspection interval to 12 years without sacrificing reliability. This interval is unprecedented, as no known submarine shafting system is currently operated with this inspection cycle, nor are any known commercial vessel shafts. Exp...

Hypotrochoidal profile contours have been produced in industrial applications recent years using two-spindle processes, and they are considered effective high-quality solutions for form-fit shaft hub connections. This study mainly concerns analytical approaches to determine the stresses deformations hypotrochoidal shafts due pure bending loads. The formulation was developed according principles...

Several standards for vibration testing of rotating machinery define limits relative shaft displacement during rotation. With requirements displacement, are given combined electrical and mechanical runout, which is the eddy probe reading error caused by geometry measured shaft. Some allow compensation runout vectorially subtracting them from current values. This paper presents a measurement pro...

3 The Rotating Calipers Algorithm 3 3.1 Computing the Initial Rectangle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 Updating the Rectangle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2.1 Distinct Supporting Vertices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2.2 Duplicate Supporting Vertices . . . . . ....

objective and aims intrauterine devices (iuds) are placed in the uterine cavity with the objective of providing long-term contraception, mainly by preventing fertilization. in this research has been tried to show that method of iud insertion is effective to decrease complications’ incidence . rotating withdrawal technique is presenting, has been using for this purpose. design and setting this h...

the sofeh mountain in the south of isfahan (iran) has a development of shafts (vertical cave). simorgh cave with a depth of 42 m and a length of 52 m has developed along significant fault structures. structural analysis indicates relationships of orientation between the faults and fractures and shafts and chambers geometries. considering the main ne-sw trend of tectonic structures in the area, ...

To secure the availability of machines and facilities, the reaction to beginning damage must be as fast as possible. Thus, early detection of damage initiation is crucial to the quick planning and execution of reconditioning measures. This helps to minimize downtime and increase availability. Modern high performance transmissions in fabrication and energy industries more and more have to satisf...