Refine your search
Collections
Co-Authors
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Srinivasan, P. S. S.
- Vibration Analysis of Misaligned Shaft-ball Bearing System
Abstract Views :576 |
PDF Views:346
Authors
Affiliations
1 Dept. of Mech. Engg., Kongu Engg. College, Perundurai, Erode- 638052, IN
2 Knowledge Institute of Technology ,Salem, 637504, IN
1 Dept. of Mech. Engg., Kongu Engg. College, Perundurai, Erode- 638052, IN
2 Knowledge Institute of Technology ,Salem, 637504, IN
Source
Indian Journal of Science and Technology, Vol 2, No 9 (2009), Pagination: 45-50Abstract
Experimental studies were performed on a rotor dynamic test apparatus to predict the vibration spectrum for shaft misalignment. A self-designed simplified 3 pin type flexible coupling was used in the experiments. The rotor shaft accelerations were measured using dual channel vibration analyzer (ADASH) under the misalignment condition. The experimental and numerical (ANSYS) frequency spectra were obtained. The experimental predictions are in agreement with the ANSYS results. Both the measured and ANSYS results spectra shows that misalignment can be characterized primarily by 2X (two times) shaft running speed. However, misalignment 2X is not close enough to one of the system natural frequencies to excite the system appreciably. Therefore, there are cases where the misalignment response is hidden and does not show up in the vibration spectrum. On the other hand, if 2x shaft running speed is at or close to one of the system natural frequencies, the misalignment effect can be amplified and the speed is pronounced in the frequency spectrum.Keywords
Misalignment, Vibration Analysis, Pin Type Flexible Coupling, Ball BearingFull Text
References
- Arumugam P, Swarnamani S and Prabhu BS (1995) Effects of coupling misalignment on the vibration characteristics of a two stage turbine rotor. ASME Design Engg. Tech. Conf. 84, 1049-1054.
- Dewell DL and Mitchell LD (1984) Detection of a misaligned disk coupling using spectrum analysis. ASME Trans. J. Vibration, Acoustics, Stress & Reliability Design. 106, 9-16.
- Ganeriwala S, Patel S and Hartung H (1999) The truth behind misalignment vibration spectra of rotating machinery. Proc. Intl. Modal Analysis Conf. pp: 2078-2205.
- Gibbons CB (1976) Coupling misalignment forces. In: Proc. of the 5th Turbo Machinery Symposium, Gas Turbine Laboratories, Texas A&M Univ. pp: 111-116.
- Goodman MJ (1989) Dynamics of rotor – bearing systems. London, Unwin Hyman Ltd.
- Piotrowski J (2006) Shaft Alignment Handbook. Third Ed. Marcel Dekker, Inc. New York.
- Sekhar AS and Prabhu BS (1995) Effects of coupling misalignment on Vibrations of rotating machinery. J. Sound Vibration. 185 (4), 655-671.
- Simon G (1992) Prediction of vibration behavior of large turbo machinery on elastic foundation due to unbalance and coupling misalignment. Proc. of the Institution of Mechanical Engineers. J. Mech. Engr . 206, 29-39.
- Vance JM (1988) Rotor dynamics of Turbomachinery. New York, John Wiley & Sons.
- Xu M and Marangoni RD (1994a) Vibration analysis of a motor flexible coupling rotor system subject to misalignment and unbalance, part I: theoretical model and analyses. J. Sound Vibration. 176(5), 663-679.
- Xu M and Marangoni RD (1994b) Vibration analysis of a motor flexible coupling rotor system subject to misalignment and unbalance, part II: Experimental validation. J. Sound Vibration. 176(5), 681-691.
- Experimental Investigation on Solar Air Heater Assisted Natural Ventilation in Single-Sided Ventilated Room
Abstract Views :409 |
PDF Views:156
Authors
Affiliations
1 Dept. of Mechanical Engineering, Knowledge Institute of Technology, Salem– 637 504, TN, IN
1 Dept. of Mechanical Engineering, Knowledge Institute of Technology, Salem– 637 504, TN, IN
Source
Indian Journal of Science and Technology, Vol 3, No 7 (2010), Pagination: 803-807Abstract
This paper presents an experimental study of solar air heater for natural ventilation in single-sided ventilated room (SSVR). This is a way to increment natural ventilation and as a consequence to improve indoor air quality. In the experiment, a flat plate collector with the length of 1.2 m, width 0.6 m and air gap 0.08 m is used. It is found that the temperature distribution of air and the induced natural air flow rate depend highly on heat input and the area of solar air heater. Experimental research indicates that the air change per hour (ACH) of room varies from 1 to 4 according to the solar incident radiation. The readings were compared with available published experimental and theoretical data. There was an acceptable trend match between experimental and published results. Instead of having a traditional solar chimney, the above approach of introducing a solar air heater method will give better solution for natural ventilation in multistory buildings.Keywords
Solar Air Heater, Natural Ventilation, ACH, SSVRFull Text
References
- Bassiouny R and Nader SA Koura (2007) An analytical and numerical study of solar chimney use for rooms natural ventilations. Energy and buildings. 39(2), 128-135.
- Choudhury C, Andersen SL and Rakstad T (1988) A solar air heater for low temperature applications. Solar Energy. 40(4), 335–343.
- Harris DJ and Helwig N (2007) Solar chimney and building ventilation. Appl. Energy. 84, 135–146.
- Hirunlabh J, Wachirapuwadon S, Pratinthong N and Khedari J (2001) New configurations of a roof solar collector maximizing natural ventilation. Building Environ. 36, 383–391.
- Khedari J, Boonsri B and Hirunlabh J (2000) Ventilation impact of a solar chimney on indoor temperature fluctuation and air change in a school building. Energy Buildings. 32, 89–93.
- Khedari J, Hirunlabh J and Bunnag T (1997) Experimental study of a roof solar collector towards the natural ventilation of new houses. Energy Buildings. 26,159–164.
- Khedari J, Mansirisub W, Chaima S, Pratinthong N and Hirunlabh J (2000) Field measurements of performance of roof solar collector. Energy Buildings. 31, 171–178.
- Kishore VVN (2001) A passive solar system for thermal comfort conditioning of buildings in composite climates. Solar Energy. 70(4), 319–329.
- Marti–Merrero J and Heras–Celemis MR (2007) Dynamic physical model for a solar chimney. Solar Energy. 81, 614–622.
- Mathur J, Bansal NK, Mathur S, Jain M and Anupma S (2006) Experimental investigations on solar chimney for room ventilation. Solar Energy. 80, 927–935.
- Sukhatme SP (1996) ‘Solar energy’ principle of thermal collection and storage, 2nd ed., Tata McGraw- Hill publishing company ltd., New Delhi.
- Visagavel K and Srinivasan PSS (2009) Analysis of single sided and cross ventilated rooms by varying the width of the window opening using CFD. Solar Energy. 83, 2-5.