Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

Determination of appropriate torsional damper for reduction of vibrations amplitude of ultralight aircrafts engine

Authors
Mohammad Reza Najafi 1
Saeed Mahjoub Moghadas 2
mojtaba moradi 3
1 IRAN
2 Mechanical Engineering Department, Imam Hossein comprehensive University, Tehran, Iran
3 iran
10.30506/ijmep.2021.141449.1746
Abstract
Abstract
These days, regarding to advanced technologies, the use of ultralight aircraft for transportation and goods movement has been attended by industries and people. One of the major challenges for ultralight aircraft designers is related to reduction of engine vibrations. In this paper, determination of torsional damper for this aircraft engine types and their effect on reducing vibrations by combining three experimental, analytical and numerical methods are discussed. Starting with dynamic analysis and coding in MATLAB software, the system gas pressure and torque were validated with experimental results with less than 2% differences. Then the amount of angular displacement was validated at maximum rotating velocity with 1.86% difference by numerical and analytical methods, then the natural frequencies of system were obtained. Finally, the equation was extracted in order to determine the appropriate damping coefficient and its characteristics were determined. The results showed that using the damper reduces the system vibrations amplitude up to 40%.
Keywords
torsional damper
vibrations amplitude
natural frequency
boxer engine
ultralight aircrafts

Subjects

[1] Mahjoub Moghadas, S., "Mechanical Vibration", 6rd Edition, Tehran, pp. 120, Sepahan, (2008), (In Persian).
[2] Fayette Taylor, C., "Aircraft Propulsion (A Review of the Evolution of Aircraft Piston Engines)", Smithsonian Institution Press City of Washington, Washington, (1971).
[3] Bishop, R. E. "The Matrix Analysis of Vibration", Cambridge Univ., Cambridge, (1965).
[4] Crandall, S.H. and J. Dugundji, "Resonant Whirling of Aircraft Propeller-engine Systems", Journal of Applied Mechanics, Vol. 48(4), pp. 929-935, (1981).
[5] Bramwell, A. R. S., Balmford, D., and Done, G. "Bramwell's Helicopter Dynamic's", Second Edition. Elsevier, Butterworth-Heinemann Company, (2001).
[6] Al-Bedoor, B.O., and Hamdan, M.N., "Geometrically Nonlinear Dynamic Model of a Rotating Beam", Journal of Sound and Vibration, Vol. 240, pp. 59–72, (2001).
[7] Genta, G., "On The Stability of Rotating Blade Arrays", Journal of Sound and Vibration, Vol. 273, pp. 805-836, (2004).
[8] Genta, G., Feng, C. and Tonoli, A., "Dynamics Behavior of Rotating Bladed Discs: A Finite Element Formulation For The Study of Second and Higher Order Harmonics", Journal of Sound and Vibration, Vol. 329(25), pp. 5289-5306, (2010).
[9] Lin, S. M., Lee, S.Y., and Wang, W. R., "Dynamic Analysis of Rotating Damped Beams with an Elastically Restrained Root", International Journal of Mechanical Sciences, Vol. 46, pp 673-693, (2004).
[10] Wang, L., Cao, D.Q., and Huang, W., "Nonlinear Coupled Dynamics of Flexible Blade– rotor–bearing Systems", Tribology International, Vol. 43(4), pp. 759-778, (2010).
[11] Rao, S., "Mechanical Vibrations", 5th Edition, Singapore Pearson Education, Boston, (2010).
[12] Anegawa, N., Fujiwara, H., and Matsushita, O., "Vibration Diagnosis Featuring Bladeshaft Coupling Effect of Turbine Rotor Models", Journal of Engineering for Gas Turbines and Power, Vol. 133(2), pp. 501-510, (2010).
[13] Moeenfard, H., Moetakef Imani, B., Davoudi, M., and Rahimzadeh, A., "Dynamic Instability in Tapered Beams Under Wind Excitation", Modares Mechanical Engineering, Vol. 15, pp. 153-161, (2015), (In Persian).
[14] Sala, D., Motylewski, J., Mróz A., Pawłowski, P., "Vibro-acoustic System for Measurement of the Touchdown of a Light Aircraft", Transport/Politechnika Śląska, (2017).
[15] Liu, Y., Zhang, F., Zhao, Z., Cui, T., Zuo, Z., and Zhang, S., "The Effects of Pressure Difference on Opposed Piston Two Stroke Diesel Engine Scavenging Process", International Energy Procedia, Vol. 142, pp. 1172-1178, (2017).
[16] Grabowski, L., Pietrykowski, K., Karpiński, P., "The Zero-dimensional Model of the Scavenging Process in the Opposed-piston Two stroke Aircraft Diesel Engine", Propulsion and Power Research, Vol. 8 (4), pp. 300-309, (2019).
[17] Olejnik, A., Kachel, S., Rogólski, R., and Szcześniak, M., "Technology of Ground Vibration Testing and its Application in Light Aircraft Prototyping", In MATEC Web of Conferences 304, pp. 1005, (2019).
[18] McGowan, R.C., Pieri, J.J., Szedlmayer, M.T., Kim, K., Clerkin, P.J., Kruger, K.M., Gondol, D., Kweon, C.B., Meininger, R., Gibson, J.A., and Lindsey, C., "Experimental Vibration Analysis of an Aircraft Diesel Engine Turbocharger", In AIAA Propulsion and Energy, pp. 4008, (2019).
[19] Agostino, D. M., and Pierluigi, D. V., "Flight Tests, Performances, and Flight Certification of a Twin-Engine Light Aircraft Fabrizio Nicolosi", Journal of Aircraft, Vol. 48 (1), pp. 177-186, (2012).
[20] Poul, R., Ruzicka, P., Hanus, D., and Blahous, K., "Design of Carbon Composite Driveshaft for Ultralight Aircraft Propulsion System", Acta Polytechnica, Vol. 46 (5), pp. 177-186, (2010).
[21] Dimentberg M.F., Iourtchenko D.V., "Random Vibrations with Impacts: A Review", Nonlinear Dynamics, Vol. 36 (2), pp. 229-254, (2004).
[22] Ibrahim R.A., "Vibro-impact Dynamics: Modeling, Mapping and Applications", Springer Science & Business Media, (2009).
[23] Popplewell, N., and Liao, M., "A Simple Design Procedure for Optimum Impact Dampers", Journal of Sound and Vibration, Vol. 146 (3), pp. 519-526, (1991).
[24] Zhang, D.G., and Angeles J., "Impact Dynamics of Flexible-joint Robots", Computers & Structures, Vol. 83, pp. 25-33, (2005).
[25] Zinjade P.B., Mallik A.K., "Impact Damper for Controlling Friction-driven Oscillations", Journal of Sound and Vibration, Vol. 306, pp. 238-251, (2007).
[26] Blazejczyk-Okolewska, B., "Analysis of an Impact Damper of Vibrations", Chaos, Solitons & Fractals, Vol. 12, pp. 1983-1988, (2001).
[27] Mahjoub Moghadas, S., "Internal Combustion Engines Control and Diagnostics through Instantaneous Speed of Rotation Analysis", Ph.D. Thesis, Department of Mechanical Engineering, University of L'ensam, Paris, (1985).
[28] Najafzadeh, M., "Fault Control and Detection in Internal Combustion Engines through Angular Velocity and Vibration Analysis", Master Thesis, Imam Hossein University, Tehran, (2007).
[29] Rao, S.S., and Yap, F.F., "Mechanical vibrations", Pearson-prentice hall, Upper Saddle
River, (2011).

  • Receive Date 25 November 2020
  • Revise Date 13 January 2021
  • Accept Date 17 February 2021