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The performance of vehicle active safety systems is dependent on the friction force arising from the contact of tires and the road surface. Therefore, an adequate knowledge of the tire–road friction coefficient is of great importance to achieve a good performance of different vehicle control systems. This paper deals with the tire–road friction coefficient estimation problem through the knowledge...
In surface engineering, new coatings and deposition techniques for decreasing wear have been proposed. However, the tribological behaviors of these coatings under lubricated sliding with biodegradable oils are unknown. The objective of this study was to evaluate the tribological behaviors of two hydraulic biodegradable oils, namely hydraulic environmental ester oil synthetic (HEES) and hydraulic oil...
The curve-face gear pair is a new type of gear pair, and it has not been widely applied in many occasions as other kinds of gear pairs. In order to solve the bending fatigue life problem of this new gear pair with time-varying characteristics, a new theoretical calculation model was established. According to the loading state in actual operation, the single-tooth force model of curve-face gear pair...
In this era of advancing world, aluminium alloys are in abundant demand. The use of dissimilar aluminium alloys is the source of present attraction in almost all the fields. This study emphasizes on the friction stir welding of dissimilar aluminium alloys AA 6061-T6 and AA 8011-h14. The influence of the alloy position and tool offset is studied on various properties keeping other welding parameters...
Very low head (VLH) axial hydro turbines are efficient turbomachinery to harness energy from tidal or river currents and increase renewable energy penetration in the world’s electric power generation. In this paper, the initial design of a VLH turbine with high pitch blade is optimized. The class function/shape function transformation method is applied along with a coupling of XFOIL with a MATLAB...
In this work, we are interested to the PID control of nonlinear systems and more specially the control of a robot manipulator. The idea is to determine the optimal parameters ($$K_{p}, K_{i}$$ Kp,Ki and $$K_{d}$$ Kd ) of the controller using a novel algorithm of optimization called whale optimizer algorithm (WOA). To study the effectiveness of WOA-PID controller, its performance is compared with...
The influence of the cone vertex error and tilt error on the tooth contact trace of double circular-arc spiral bevel gears for industrial robot joint nutation drive has been studied in this paper. According to the meshing relationship between double circular-arc spiral bevel gear and crown gear, the meshing coordinate systems with latent error parameters of cone vertex error and tilt error were established,...
This article proposes a fuzzy sliding mode control based on multi-objective genetic algorithm for the path control of a two-link robot. Sliding mode control (SMC) is known for its competences in manipulating imprecision and bounded tribulations in modeling. In SMC, the high frequency that eventuates from a halting control action, known as the chattering phenomenon, is a severe problem. Fuzzy logic...
Metal matrix composites (MMCs) with their splendid mechanical properties have been specifically designed for use in fields such as aerospace and aviation. The presence of hard ceramic particles in MMC increases the hardness of the matrix product and decreases its coefficient of friction. Therefore, the wear resistance is improved. Moreover, the mechanical properties of these composite materials can...
Welding is a well-known process in manufacturing industries due to its importance. Several process parameters should be tuned in order to perform a high-quality welding. Usually, the problem is described as an optimization one and the challenge is to reconcile conflicting objectives. This paper deals with a multi-objective welding process namely the submerged arc welding process, involving five objectives...
In this study, the effects of viscoelastic properties of non-Newtonian fluids on the flat plate boundary layer are investigated numerically. The numerical solution is obtained using a second-order parallelized finite volume method based on pressure implicit with splitting of operators’ algorithm. Here, the nonlinear Giesekus model is used as the constitutive equation for numerical simulations. The...
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