A simulation study was conducted to evaluate three terramechanics methods used for predicting single wheel performance of small vehicles on granular terrain. Traditional Bekker-type terramechanics methods do not consider the soil profile, the soil dynamics, or the transient wheel dynamics, which can be important factors in vehicle performance. The ‘dynamic Bekker’ method used to overcome these ...

This paper discusses the development of a deformable terrain database to be used in a co-simulation environment with a multibody dynamics vehicle model. The implementation of the model includes a general tire-terrain traction model which is modular to allow for any type of tire model that supports the Standard Tire Interface[1] to operate on the terrain. Rather than utilizing empirical terramec...

ABSTRACT We study the interplay between galaxy evolution and central black hole (BH) growth using NewHorizon cosmological simulation. BH is slow when dark-matter halo below a golden mass of $M_{\rm v}\sim 10^{12}\, \rm M_\odot$, rapid above it. The early suppression primarily due to gas removal by supernova (SN) feedback in shallow potential well, predicting that BHs ${\sim}10^5\, M_\odot$ tend...

this research explores the possible benefits to be derived from interactions between wheels, for supporting a greater proportion of applied loads in the shallower soil layers. this creates possibilities for reducing the risk of deep soil compaction. previous research indicated that different interaction modes occurred under simulated wheel arrangements, being mostly dependent upon the spacing b...

Hull Vane (HV) is an energy-saving appendage introduced by BV company to reduce total ship resistance. Shapewise, HV a hydrofoil wing transversely fixed at the transom bottom of hull. In this paper, data-driven shape optimization method proposed for HV. To avoid time-consuming resistance evaluation designs via viscous flow solver, we develop Machine-Learning (ML) based model that predicts hull'...

This paper numerically investigates the resistance at full-scale of a zero-emission, high-speed catamaran in both deep and shallow water, with Froude number ranging from 0.2 to 0.8. The numerical methods are validated by two means: (a) Comparison available model tests; (b) blind validation using different flow solvers. resistance, sinkage, trim catamaran, as well wave pattern, longitudinal cuts...

Planing vessels usually have low ratios of resistance to weight, so they can move fast on sea surface than the displacement or semi-displacement ships. Access to higher speeds is one of the attractions for designers and users. To achieve higher speeds, reducing the hydrodynamic resistance is a necessity for this class of vessels. In this study, a 3D finite volume approach is used to analyze the...

Traction failure on loose terrain is common in conventional agricultural wheeled tractors due to poor traction ability and lower power transfer efficiency of drive wheels, which leads excessive energy consumption soil compaction agriculture. To overcome the problem, this paper presents a new design rigid lugged wheel for use field tillage operations. This was designed according operational requ...

In order to determine the best approach for the modeling of tracked vehicle-terrain interactions, a comparison is made between terramechanics and continuum mechanics plasticity soil models that can be used in vehicle dynamic simulations. The absolute nodal coordinate formulation (ANCF) which can be used in multibody system (MBS) dynamics to model large rotations and large deformations will prov...