Passive Control of Piston Secondary Motion Using Nonlinear Energy Absorbers

Dolatabadi, Nader; Theodossiades, Stephanos; Rothberg, Steve

doi:10.1115/1.4036468

Cited by 12 publications

(6 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oil film force and moment are nonlinear components due to the nonlinear pressure distribution. 31,32 The lubrication model between the piston and liner is always considered to be the hydrodynamic lubrication model, according to the average flow model that was established by Patir and Cheng. 30 When the effect of the surface wave on the lubrication is considered, the average Reynolds equation between the piston skirt and liner is written as follows…”

Section: Hydrodynamic Lubrication Modelmentioning

confidence: 99%

Piston dynamics analysis considering skirt-liner dynamic clearance

Tian

Feng

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

Piston slap force is one of the main sources of mechanical engine noise. To obtain a more accurate determination of the piston slap force and minimize piston slap noise, a new simulation model that considers dynamic clearance of the piston skirt and liner has been established in this study. The skirt-liner dynamic clearance is caused mainly by the elastic deformation and thermal deformation of the piston. Comparing three different models, it was found that the impact of dynamic clearance on the piston slap force is reflected mainly in the medium-high frequency, which is the sensitive frequency of the slap noise. Therefore, it is necessary to consider dynamic clearance in the simulation model. In addition, the mechanisms behind the dynamic clearance effect on fluid lubrication, piston dynamics, and piston slap noise were observed. In particular, three typical structural parameters in piston dynamics (the piston pin offset, piston-liner clearance, and piston skirt profile) were studied. The analyses provide guidance for the design of low-noise engines.

show abstract

Section: Hydrodynamic Lubrication Modelmentioning

confidence: 99%

Piston dynamics analysis considering skirt-liner dynamic clearance

Tian

Feng

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…Recently, studies have focused on the external periodic forcing of the primary system in conjunction with the NES [14,20].…”

Section: S Theodossiades Cnd-17-1339mentioning

confidence: 99%

Design Optimization Study of a Nonlinear Energy Absorber for Internal Combustion Engine Pistons

Dolatabadi

Theodossiades

Rothberg

2018

Journal of Computational and Nonlinear Dynamics

Self Cite

View full text Add to dashboard Cite

Piston impacts against the cylinder liner are the most significant sources of mechanical noise in internal combustion (IC) engines. Traditionally, the severity of impacts is reduced through the modification of physical and geometrical characteristics of components in the piston assembly. These methods effectively reduce power losses at certain engine operating conditions. Frictional losses and piston impact noise are inversely proportional. Hence, the reduction in power loss leads to louder piston impact noise. An alternative method that is robust to fluctuations in the engine operating conditions is anticipated to improve the engine's noise, vibration and harshness (NVH) performance, while exacerbation in power loss remains within the limits of conventional methods. The concept of targeted energy transfer (TET) through the use of nonlinear energy sink (NES) is relatively new and its application in automotive powertrains has not been demonstrated yet. In this paper, a TET device is conceptually designed and optimized through a series of parametric studies. The dynamic response and power loss of a piston model equipped with this nonlinear energy sink is investigated. Numerical studies have shown a potential in reducing the severity of impact dynamics by controlling the piston's secondary motion.

show abstract

“…Recent studies [6][7][8][9][10][11] have revealed the potential of using nonlinear vibration absorbers (nonlinear energy sinks (NES)) with low mass and inertia properties for effectively attenuating the generation and propagation of powertrain torsional oscillations. The NES possesses essentially nonlinear stiffness and, thus, instead of being tuned to a preferential frequency, it is activated by the energy input.…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Energy Sink Design to Attenuate the Torsional Oscillations of Lightly Loaded Gear Pairs

et al. 2022

View full text Add to dashboard Cite

Nonlinear energy sinks (NES) have recently attracted significant interest for the suppression of unwanted vibrations in a variety of mechanical systems. The key advantage in employing this (vibration absorber) approach is the broadband nature of the interactions with a primary system for which vibration energy dissipation is required. Thus, the effectiveness of the NES is decoupled from the need of tuning to specific frequencies. Nevertheless, NES for rotational fluctuations of powertrains have received limited attention in the literature. In this work, a design for a rotational NES to mitigate speed fluctuations in gear trains is presented and tested experimentally. The development of the proposed system is underpinned by previous optimisation studies conducted by the authors, where a disk was utilised as an inerter NES. A set of beams couple the inerter with the wheel gear of a spur gear pair with a nonlinear restoring torque, which is designed to approach the desired essential nonlinearity within realistic practical tolerances. Static and dynamic identification is conducted to confirm the desired characteristics. Despite uncertainties in the prototype testing, the approach is found to reduce the speed fluctuations on the gear pair output shaft, with appropriate predictability established for the model and the design procedure.

show abstract

Passive Control of Piston Secondary Motion Using Nonlinear Energy Absorbers

Cited by 12 publications

References 48 publications

Piston dynamics analysis considering skirt-liner dynamic clearance

Piston dynamics analysis considering skirt-liner dynamic clearance

Design Optimization Study of a Nonlinear Energy Absorber for Internal Combustion Engine Pistons

A Nonlinear Energy Sink Design to Attenuate the Torsional Oscillations of Lightly Loaded Gear Pairs

Contact Info

Product

Resources

About