Showing 2 results for Esmaeili
S. H. Tabatabaei Oreh, R. Kazemi, N. Esmaeili,
Volume 4, Issue 3 (9-2014)
Abstract
Direct Yaw moment Control systems (DYC) can maintain the vehicle in the driver’s desired path by
distributing the asymmetric longitudinal forces and the generation of the Control Yaw Moment (CYM). In
order to achieve the superior control performance, intelligent usage of lateral forces is also required. The
lateral wheel forces have an indirect effect on the CYM and based upon their directions, increase or
decrease the amount of CYM magnitude. In this paper, a systematic and applicable algorithm is proposed to
use the lateral force in the process of Yaw controlling optimally. The control systems are designed based on
the proposed algorithm. This system includes Yaw rate controller and wheel slip controllers which are
installed separately for each wheel. Both of the mentioned control systems are designed on the basis of the
Fuzzy logic. Finally, the capabilities of the proposed control systems are evaluated in a four wheel drive
vehicle, for which, the traction of each wheel can be controlled individually. It is shown that considering
the lateral force effect offers significant improvement of the desired yaw rate tracking
Dr. Sadjad Pirmohammad, Mr Sobhan Esmaeili Marzdashti, Mrs Elnaz Vosoghifard,
Volume 11, Issue 1 (3-2021)
Abstract
Thin-walled columns are frequently employed in vehicle structures to diminish the damages resulting from vehicle collisions. In this research, the effect of hole shapes and dimensions on crushing behavior of octagonal multi-cell columns subjected to longitudinal loading is studied. Rectangular, hexagonal and elliptical holes are assumed on the octagonal multi-cell columns, and crushing parameters (i.e. specific energy absorption SEA and maximum crushing force Fmax) are then obtained by performing numerical analyses in LS-DYNA. The results demonstrate that creation of holes on column walls improve crushing capability significantly, such that creation of rectangular, hexagonal and elliptical holes on the octagonal multi-cell columns increases the value of SEA by 37%, 42% and 39%, respectively in comparison to the plain octagonal column. On the other hand, presence of holes on the octagonal columns results in reduction of Fmax (as a negative crushing indicator).
