Prediction of sound pressure level for a dual-stage hydromechanical transmission
DOI:
https://doi.org/10.1080/14399776.2015.1120137Keywords:
Sound pressure level, CVT noise; dual-stage, hydromechanical transmission, input coupledAbstract
Hydromechanical continuously variable transmissions are frequently used in high power applications, including agricultural vehicles, buses and heavy vehicles. These offer several operative advantages such as improved driving comfort, better operational management and less fuel consumption if appropriately managed. However, the acoustic impact that they generate in the environment, which should be checked in the early stages of the project, is often neglected. This paper studies the noise emitted by a drive train for urban buses, which comprises a natural gas engine and a hydromechanical input coupled dual-stage ransmission. The aim of this study is the evaluation of the noise emitted by the transmission compared with that emitted by the engine, which is considered the main noise source in the vehicle. The study was carried out by means of a model of the entire vehicle that was implemented in an Amesim environment. The mechanical model was integrated with the acoustic models of the engine and of the transmission. The results show that the transmission, despite its two hydraulic machines, produces a sound pressure level lower by about 2 to 15 dBA than that of the engine, whereas its contribution to the total pressure level does not exceed 1 dBA.
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References
AMESim, 2013. Copyright 1996–2008, LMS imagine SA.
Version 12.
Bies, D.A. and Hansen, C.H., 1988. Engineering noise control:
theory and practice. London: Taylor & Francis.
Blair, G.P. and Spechko, J.A., 1972. Sound pressure levels
generated by internal combustion engine exhaust systems.
SAE Technical Paper no. 720155.
Blake, C., Ivantysynova, M., and Williams, K., 2006.
Comparison of operational characteristics in power split
continuously variable transmissions. 2006 SAE Commercial
Vehicle Engineering Congress & Exhibition. SAE Technical
Paper no. 2006-01-3468. Rosemont, IL, USA.
Casoli, P., et al., 2007. A numerical model for the simulation
of diesel/CVT power split transmission. ICE2007 8th
International Conference on Engines for Automobiles. SAE
Technical Paper no. 2007-24-0137. Capri (NA), Italy.
De Simio, L., Gambino, M., and Iannaccone, S., 2010. Dual
fuel engines for utilization of waste vegetable oil and
municipal organic fraction as energy source in urban
areas. SEEP 2010 Conference Proceedings. Bari, Italy.
Emission test cycle [online], 2015. Available from: https://
www.dieselnet.com/standards/cycles
Klop, R., Vacca, A., and Ivantysynova, M., 2009. A method of
characteristics based coupled pump/line model to predict
noise sources of hydrostatic transmissions. Proceedings of
the ASME Dynamic Systems and Control Conference 2009.
Volume 1, pp. 291–298. Hollywood: California.
Klop, R. and Ivantysynova, M., 2011. Investigation of noise
sources on a series hybrid transmission. International
journal of fluid power, 12 (3), 17–30.
Kress, J.H., 1968. Hydrostatic power-splitting transmissions
for wheeled vehicles – classification and theory of
operation. SAE Technical Paper no. 680549.
Kumar Seeniraj, G. and Ivantysynova, M., 2011. A multiparameter
multi-objective approach to reduce pump noise
generation. International journal of fluid power, 12 (1),
–17.
Kumar Seeniraj, G., Zhao, M., and Ivantysynova, M., 2011.
Effect of combining precompression grooves, PCFV and
DCFV on pump noise generation. International journal of
fluid power, 12 (3), 53–63.
Macor, A. and Rossetti, A., 2011. Optimization of hydromechanical
power split transmissions. Mechanism and
machine theory, 46 (12), 1901–1919.
Macor, A. and Rossetti, A., 2013. Fuel consumption reduction
in urban buses by using power split transmissions. Energy
conversion and management, 71, 159–171.
Moncada Lo Giudice, G. and Santoboni, S., 1995. Acustica.
Milano: Ambrosiana.
Pfiffner, R. and Guzzella, L., 2001. Optimal operation of CVTbased
power trains. International journal of robust and
nonlinear control, 11 11, 1003–1021. Switzerland:Zϋrich.
Renius, K.T. and Rainer, R., 2005. Continuously variable
tractor transmissions. ASAE Distinguished Lecture Series.
No. 29. Germany: Dϋsseldorf, 1–37.
Rossetti, A. and Macor, A., 2013. Multi-objective optimization
of hydro-mechanical power split transmissions.
Mechanism and machine theory, 62, 112–128.
