Dynamic geometry of a rotating cylinder with shell thickness variation

Juhanko, Jari; Porkka, Esa; Widmaier, Thomas; Kuosmanen, Petri

doi:10.3176/eng.2010.4.04

Cited by 9 publications

(10 citation statements)

References 3 publications

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“…Variation problems occur throughout the entire system of rotating systems and variations will increase with the system speed. Dynamic properties for rotating shaft have the effect of varying unbalanced stiffness and bending stiffness [3].…”

Section: Figure 4: the Gap And Flush Measuring Directionsmentioning

confidence: 99%

“…Roundness is an object such as a circle or cylinder with tolerance evaluated by reference to ideal geometric properties [21]. Rotation accuracy depends on the centrifugal force and variations in cylinder geometry which affect the stability of the system [3]. In the measurement and analysis of rotating system vibrations, it is possible to detect and locate important errors such as mass imbalance, alignment, rubbing and cracking of the crack [22].…”

Section: Application Of Geometric Characteristic In Rotating Partmentioning

confidence: 99%

“…Previous studies have included the use of tolerance to improve the quality, cost, develope of standart and the impact of tolerance on the performance system. Since the GD&T is very significant in most rotating machinery, a critical analysis is needed to find out the case and reaction.Run-out characteristics are the sum of geometric errors and rotational axis rotation effects [3]. Investigating the impact between dimensional accuracy and dynamic geometry for rotating cylinders was Coordinate measuring machine (CMM) is used as a procedure for assessing the geometry tolerance of cylinders and data is presented based on minimum zone criteria [63].…”

Section: Application Of Geometric Characteristic In Rotating Partmentioning

confidence: 99%

“…Tolerance design, assembly process and component deformation are issues that need to be addressed in meet the geometry requirements of the rotating system [3]. Rotation accuracy improves the system's ability to operate better.…”

Section: Introductionmentioning

confidence: 99%

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Geometric Tolerance Applications and Analysis Method in Rotational Mechanical Components

Jafri*,

Ramli,

Azman

2020

IJRTE

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This paper focus a review on geometrical tolerance application and effects in rotational mechanical components. In today’s rapid competition on pump and turbomachinery industry the geometrical tolerancing process plays a significant role in high rotational speed of shaft. The imbalance force and misalignment of the shaft during rotating is the cause of the system's vibration. Therefore, Geometrical Dimensioning and Tolerance (GD&T) has been considered as an essential requirement to be fulfilled by rotating machinery manufacturers and assembly worker. The impact and the level of damage to critical parts of the machine were reviewed as a benchmark for further study to reduce the problem and improve the life time component. As a result, there are extensive researches such as optimisation of tolerance for mechanical components in rotating machinery

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Section: Figure 4: the Gap And Flush Measuring Directionsmentioning

confidence: 99%

Section: Application Of Geometric Characteristic In Rotating Partmentioning

confidence: 99%

Section: Application Of Geometric Characteristic In Rotating Partmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geometric Tolerance Applications and Analysis Method in Rotational Mechanical Components

Jafri*,

Ramli,

Azman

2020

IJRTE

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“…The rotation depends on the centrifugal force and the variation of the cylinder stiffness. The centrifugal effect of dynamic geometry is a function of rotational speed [14]. Improper geometry of the shaft will generate vibrations in the rotating component and produce irregular sound and noise.…”

Section: Measure the Vibration Valuementioning

confidence: 99%

Comparison of Geometrical Characteristics Against Rotating Shaft Vibration

2020

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Geometrical dimensioning and tolerance (GD&T) are an important element of the industry that uses high-speed rotation. Poor geometrical tolerance (GT) to components will cause the rotor to become unbalanced. Unbalanced rotor and shaft misalignment are the two major sources of vibration in the rotating system. This paper compares geometrical characteristics (GCs) to investigate the effects of vibrations generated by different GCs. Only four GC shafts were compared, straightness, parallelism, cylindricity, and concentricity, referring to the GD&T standard as ASME Y14.5-2009. These four GCs were selected owing to their direct involvement in the rotating system. Specimens are constructed with parameters of the same dimensions, length, and GT values only differ from GCs. Specimens were measured using a digital gage to find the GT value near 3000 micron at 3 mm. The magnitude of the shaft vibration during rotation was recorded using a VA-12 vibration analyzer with different rotational speeds: 510, 770, and 900 rpm. From the vibration data, the GCs’ effect on the rotation shaft will be determined. GCs are found to have significant effects on the rotation of the shaft that should be considered in the design, installation, and maintenance of rotating shafts. The impact and degree of damage to critical parts of the system can serve as a benchmark for further studies for the optimization of tolerance values and for the maintenance of component performance.

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