COMPARISON OF GEOMETRICAL CHARACTERISTICS AGAINST ROTATING SHAFT VIBRATION

K. Jafri; Rizauddin Ramli; Abdul Hadi Azman

doi:10.11113/jt.v82.13813

Authors

K. Jafri Plant Maintenance Department, Mara Higher Skill College, Lenggong, Perak, Malaysia Centre for Engineering Materials and Smart Manufacturing (MERCU), Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi, Malaysia
Rizauddin Ramli Plant Maintenance Department, Mara Higher Skill College, Lenggong, Perak, Malaysia Centre for Engineering Materials and Smart Manufacturing (MERCU), Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi, Malaysia
Abdul Hadi Azman Centre for Integrated Design of Advanced Mechanical System (PRISMA), Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi, Malaysia

DOI:

https://doi.org/10.11113/jt.v82.13813

Keywords:

Geometrical Tolerance (GT), Rotational Speed, Rotating Shafts, Unbalanced Rotors, Shaft Misalignment, Vibration, Geometrical Characteristics (GC)

Abstract

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 GCsâ€™ 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.

References

Goyal, A & Kumar, R. 2015. Basic Vibration Signal Processing Under Misalignment. International Journal of Engineering Research Online. 3: 2.

Zaimar, M., Hammada, A., Supratomo. 2018. Effects of Inlet Closure Level on Vibration Characteristics of a Modified Centrifugal Fan. Jurnal Teknologi (Sciences & Engineering). 80(6): 37-42.

Nakhaeinejad, M. & Ganeriwala, S. 2009. Observations on Dynamic Responses of Misalignments, Observations on Dynamic Response of Misalignments. Tech Note, Spectra Quest Inc.

Askarian, A. & Hashemi, S. M. R. 2007. Effect of Axial Force, Unbalance and Coupling Misalignment on Vibration of a Rotor Gas Turbine. 14 International Congress on Sound & Vibration, ICSV14, Cairns Australia.

Guo, J., Hong, J., Yang, Z. & Wang, Y. 2013. A Tolerance Analysis Method for Rotating Machinery. 12th CIRP Conference on Computer Aided Tolerancing. ScienceDirect. 10: 77-83.

Ansarifard, A. A. & Jaamialahmadi, A. R. 2014. An Investigation the Effects of Geometric Tolerances on the Natural Frequencies of Rotating Shafts. Journal of Applied and Computational Mechanics. 1(2): 103-111.

Yoon, S. Y. 2013. Introduction to Rotor Dynamics Control of Surge in Centrifugal Compressors by Active Magnetic Bearings. Advances in Industrial Control. DOI 10.1007/978-1-4471-4240-9_2, Â© Springer-Verlag London.

Schleicha, B. & Wartzack, S. 2015. Tolerance Analysis of Rotating Mechanism Based on Skin Model Shapes in Discrete Geometry. 13th CIRP Conference on Computer Aided Tolerancing. Procedia CIRP. 27: 10-15.

Grandjean, J., Ledoux, Y., Samper, S. & Favreliere, H. 2013. Form Errors Impact in a Rotating Plane Surface Assembly. 12th CIRP Conference on Computer Aided Tolerancing. ScienceDirect, Procedia CIRP. 10: 178-185.

Islam, M. N. 2009. A Dimensioning and Tolerancing Methodology for Concurrent Engineering Applications I: Problem Representation. International Journal of Advanced Manufacturing Technology. 42: 9-10, 910-921.

Wang, W., Yu, H. J., Shafeeu, A. & Gu, T. H. 2015. Research on Aircraft Components Assembly Tolerance Design and Simulation Technology. 3rd International Conference on Material, Mechanical and Manufacturing Engineering, IC3ME.

Hota, M. J., Vakharia, D. P. 2014. A Review of Rotating Machinery Critical Speeds and Modes of Vibrations. International Review of Applied Engineering Research. 4(3): 241-250.

Dimensioning and Tolerancing. 2009. The American Society of Mechanical Engineers. New York, USA, ASME Y14.5M.

Juhanko, J., Porkka, E., Widmaier, T. & Kuosmanen, P. 2010. Dynamic Geometry of a Rotating Cylinder with Shell Thickness Variation. Estonian Journal of Engineering. 16(4): 285-296.

Lanzetta, M. & Rossi, A. 2010. Roundness Evaluation by Genetic Algorithms. Department of Mechanical, Nuclear and Production Engineering University of Pisa, Via Diotisalvi 1, 56122 Pisa, Italy.

Schleich, B. & Wartzack, S. 2015. Tolerance Analysis of rotating Mechanism based on Skin Model Shapes in discrete Geometry. 13th CIRP Conference on Computer Aided Tolerancing. Procedia CIRP. 27: 10-15.