Numerical Investigation in a Gear Drive of an Engine Balancing Unit with Respect to Noise, Friction and Durability

Klarin, Borislav; Resch, Thomas; Sessarego, Chiara; Spanu, Giorgio; Lamonaca, Gianni

doi:10.4271/2015-24-2526

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…For these simulations, the following set-up parameters were used per Ref. 18 : The first set of single-mesh experiments, Test #1 of Table 1, considered the case when input torque fluctuation amplitude is varied within the range T aP ⊂ [12,18] Nm while other excitation parameters were kept constant at T aL = 0 at T mP = T mL = T m = 6 Nm (unity-ratio gear pair), and 1 2π ω P = 5 Hz. In Figure 3(a1), measured L p curves are plotted as a function of T aP while Figure 3(a2) does the same for the predicted L r , both at the three backlash values of 2b = 125, 190 and 275 μm.…”

Section: Single-mesh Gear Pair Resultsmentioning

confidence: 99%

“…The next set of experiments displayed in Figure 3(b1) had both input and output torque fluctuations. Input torque fluctuation amplitude was varied within T aP ⊂ [7,20] Nm while the output torque fluctuation was kept constant at T aL = 5 Nm along with the other excitation parameters T m = 6 Nm, 1 2π ω P = 1 2π ω L = 10 Hz and ϕ = 0. The L p (T aP ) curve for 2b = 125 μm is seen to be 5 to 10 dB lower than the L p (T aP ) curve for 2b = 275 μm within this range of T aP , which demonstrates drastic influence of the backlash magnitude on the resultant rattle noise.…”

Section: Single-mesh Gear Pair Resultsmentioning

confidence: 99%

“…Gear rattle is commonly observed in various automotive drivetrain applications. Among them, engine balancer systems 1 and transmissions of manual, dual-clutch, and automated-manual kind [2][3][4] typically involve a single rattling gear pair while other systems such as diesel engine timing gear trains 5,6 can be considered multi-mesh rattle examples.…”

Section: Introductionmentioning

confidence: 99%

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An experimental and theoretical investigation of the influence of backlash on gear train vibro-impacts and rattle noise

Donmez

Kahraman

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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Rattling is a perennial gear noise problem observed in various powertrain components ranging from manual transmissions to engine balancers and timing gear trains. Under lightly loaded conditions, gear systems that are subjected to input and/or output torque fluctuations exhibit vibro-impacts as tooth separations and coast-side contacts take place in the presence of backlash. Experimental set-ups that can impose tightly controlled torque fluctuations to single or multi-mesh gear train are used here to determine the sensitivity of the rattling noise levels to the magnitudes of backlash within wide ranges of torque fluctuation parameters. Torsional discrete models of the experimental set-ups were used to simulate these rattling motions and to predict impact velocity-based rattle severity indexes as a function of both excitation parameters and backlash magnitudes. Single-mesh results show that the larger backlash values result in higher noise levels in most of the cases. In case of double-mesh systems, the resultant noise levels and the corresponding rattle indices exhibit different sensitivities to backlash magnitudes depending on the excitation conditions.

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Section: Single-mesh Gear Pair Resultsmentioning

confidence: 99%

Section: Single-mesh Gear Pair Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An experimental and theoretical investigation of the influence of backlash on gear train vibro-impacts and rattle noise

Donmez

Kahraman

2022

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…However, this camshaft should be distinct from the camshaft of traditional mechanically controlled naval engines. It is significantly smaller and with a significantly smaller diameter [47].…”

Section: B Supply Unitmentioning

confidence: 99%

Assessing the Sustainability of the Most Prominent Type of Marine Diesel Engines under the Implementation of the EEXI and CII Regulations

Polemis,

Boviatsis,

Chatzinikolaou

2023

Clean Technol.

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The wide spread of the Diesel engine has been instrumental in the development of modern shipping. Marine Diesel engines dominate today as an option for the propulsion of commercial ships. While replacing Diesel engines with alternative propulsion engines is difficult to achieve, companies, in light of the new EEXI regulations, are turning to improvements, such as operating at lower rotational speeds, higher maximum combustion pressures, and more efficient overcrowding systems. Τhe purpose of this research paper is (i) to present the basic operating principles of marine Diesel engines, (ii) to study the main differences between electronically controlled Diesel engines and their mechanically controlled counterparts, and (iii) to evaluate their performance under newly introduced IMO’s EEXI regulations. Thus, after comparing Wärtsilä RTA and WinGD WX, the paper concluded that WinGD WX, being electronically controlled, will perform more effectively under new EEXI regulations, as it offers (i) reduced fuel consumption in low-load mode, (ii) zero-smoke emission at all operating speeds, (iii) very stable operation at low speed, (iv) more straightforward engine setup leading to less maintenance, (v) more extended periods between maintenance, mainly due to better load distribution between cylinders and more perfect combustion. From a regulatory perspective, the new limitations installed by the newly implemented EEXI and CII regulations will cause fewer implications in electronically controlled engines, while from an economic standpoint, the electronically controlled engines decrease OPEX and require fewer personnel, due to their efficiency at low loads and overall flexibility.

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An Analytical Methodology for Engine Gear Rattle and Whine Assessment and Noise Simulation

Moetakef

Zouani

Felice

et al. 2019

SAE Technical Paper Series

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Numerical Investigation in a Gear Drive of an Engine Balancing Unit with Respect to Noise, Friction and Durability

Cited by 7 publications

References 6 publications

An experimental and theoretical investigation of the influence of backlash on gear train vibro-impacts and rattle noise

An experimental and theoretical investigation of the influence of backlash on gear train vibro-impacts and rattle noise

Assessing the Sustainability of the Most Prominent Type of Marine Diesel Engines under the Implementation of the EEXI and CII Regulations

An Analytical Methodology for Engine Gear Rattle and Whine Assessment and Noise Simulation

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