Mechanical looseness vibration(mechanical engineering ugm)
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This document discusses mechanical looseness in machines. It defines mechanical looseness as improper contact between component parts, characterized by high amplitude vibrations at harmonics of the running frequency. There are two types of mechanical looseness: non-rotating caused by loose stationary parts, and rotating caused by clearance between rotating and stationary elements. Specific causes mentioned include loose foundation bolts, bearing liner loose in cap, and loose impeller on a shaft. The effects are increased vibration levels and potential for detached parts to cause damage. Vibration spectrum analysis can help identify the type of looseness based on the harmonic frequencies present.
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Unbalanced vibration occurs when the mass of a rotating object is not evenly distributed around its axis of rotation. This causes a centrifugal force during rotation that vibrates the bearings or mounting. There are three main types of unbalance: static, couple, and dynamic. Static unbalance causes the heavy side to always drop down, couple unbalance exists when two unbalances are 180 degrees apart in different planes, and dynamic unbalance has an axis that is both tilted and displaced from the centerline. Unbalance can be caused by issues like blow holes in castings, wear over time, or accumulation of tolerances during assembly. It is diagnosed using vibration spectrum analysis of the 1x amplitude and phase readings across sensors.
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Mechanical looseness vibration(mechanical engineering ugm)
- 1. Perpindahan Kalor dan Massa 2 Mechanical Looseness Vibration Dosen : Indarto, , Ir., DEA., Dr., Prof. email : teguh.pp@ugm.ac.id
- 2. Anggota Kelompok 1. Marhala Pandamana S(15/43902/TK/385240) 2. Moses Gregory (15/385253/TK/43905) 3. Monang Eleazar (15/385242/TK/43904) 4. Riva Yudha Abriyant (15/385256/TK/43918)
- 3. Mechanical Looseness Mechanical looseness is the improper between component parts, is generally characterized by a long string of harmonics of running frequency with abnormally high amplitudes. In some machines vibration levels may be excessive as a consequence of components being assembled too loosely, for example in the case of a bearing, which is not properly secured.
- 4. Types of Mechanical Looseness Based on the causes, there are two types of mechanical looseness. There are: 1. Non Rotating looseness Non rotating looseness is looseness that caused by the distance between two stationary parts is too big. 2. Rotating looseness Rotating looseness is looseness that caused by too much room between rotating and stationary elements in the machine. Both types generate extensive vibrations at 1X harmonics in all three directions.
- 5. 1. Non Rotating Looseness Non rotating looseness causes the highest vibrations in the direction where the stiffness is the smallest. The stiffness is usually least in the horizontal direction, but it depends on the physical layout of the machine. Loose foundation can be causes by loose bolts, rust or cracks. There are two types in non rotating looseness: 1. Type ‘A’ 2. Type ‘B’
- 6. 1. Non Rotating Looseness 1. 1 Type ‘A’
- 7. 1. Non Rotating Looseness 1. 1 Type ‘A’ Type 'A' is caused by structural looseness/weakness of machine feet, base plate or foundation, also by deteriorated grouting, loose hold-down bolts at the base and distortion of the frame or base (i.e Soft Foot). Phase analysis may reveal approx. 180° phase difference between vertical measurements on the machine foot, base plate and base itself.
- 8. 1. Non Rotating Looseness 1. 2 Type ‘B’ Type 'B' is generally caused by loose pillow block bolts, cracks in the frame structure or bearing pedestal.
- 9. 2. Rotating Looseness Type 'C' is normally generated by improper fit between component parts which will cause many harmonics due to non linear response of loose parts to dynamic forces from the rotor. Causes a truncation of time waveform. Type 'C' is often caused by a bearing liner loose in its cap, excessive clearance in either a sleeve or rolling element bearing or a loose impeller on a shaft. Type 'C' phase is often unstable and may vary widely from one measurement to the next, particularly if the rotor shifts position on the shaft from one start-up to the next.
- 10. 2. Rotating Looseness Bearing clearance in journal bearings or rolling element bearings generates 1X harmonics, which sometimes streches to 10X. If the high harmomics are dominating collisions can be suspected. In rotating looseness, there is type ‘C’.
- 11. 2. Rotating Looseness Type 'C' is normally generated by improper fit between component parts which will cause many harmonics due to non linear response of loose parts to dynamic forces from the rotor. Causes a truncation of time waveform. Type 'C' is often caused by a bearing liner loose in its cap, excessive clearance in either a sleeve or rolling element bearing or a loose impeller on a shaft. Type 'C' phase is often unstable and may vary widely from one measurement to the next, particularly if the rotor shifts position on the shaft from one start-up to the next.
- 12. What causes looseness? Possible causes of wear/looseness are: • The machine has come loose from its mounting • A machine component has come loose • The bearing has developed a fault that has worn down the bearing elements or the bearing seat
- 13. The effects of looseness • If the looseness is bearing related, the effects are the same as imbalance, only more severe • If looseness is generated from a component (for example, a fan blade), there is a possibility the part will become detached, causing secondary damage.
- 15. Mechanical Looseness Vibration Spectrum 1. Caused By Misalignment (Jason, 2013)
- 16. Mechanical Looseness Vibration Spectrum 2. Caused By Unbalanced (Jason, 2013)
- 17. Mechanical Looseness Vibration Spectrum 3. The Overall Looseness (Jason,2013)
- 18. References 1. http://www.iitg.ernet.in/scifac/qip/public_html/cd_cell/chapters/rtiwari_ rotor_bearing_system/rt_chapter17.pdf 2. http://www.vtab.se/training/vibration-school/mechanical- looseness/?lang=en 3. http://vlabs.iitkgp.ernet.in/rmfs/exp5/pdf/Mechanical_Looseness.pdf 4. http://www.skf.com/binary/tcm:12113997/CM5118%20EN%20Spectrum %20Analysis.pdf