Numerical Analysis of the Forces on the Components of a Direct Diesel Engine

• Published in: Applied sciences 2018-05, Vol.8 (5), p.761
• Main Authors: Viet Nguyen, Dung, Nguyen Duy, Vinh
• Format: Article
• Language: English
• Subjects: Cylinders; Diesel engines; Engines; Failure analysis; fine element method; Finite element analysis; Friction; friction force; in-cylinder pressure; internal combustion engine; Internal combustion engines; Load; mechanical stress; Numerical analysis; Pressure; R&D; Research & development; Software; Stress analysis; Yield stress
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app8050761

[...]the operating characteristics of the internal combustion engines cannot be correctly obtained. [...]as mentioned in prior studies [13,14], the thermal and mechanical stresses of engines after turbocharging dramatically increased. [...]evaluating the stress increase is necessary to find a solution for the stable and longtime operation of these engines. [...]in this research, we assumed that the forces exerted on the piston were symmetric in the x direction. [...]the forces acting on the piston include Q(t), the total external force acting on the piston, mP.g, the force of gravity, and FBX, FBY, the link reaction forces in the x and y directions, respectively [17,19], as described in Figure 4. Since the piston does not move in the x direction, the total force acting on x is zero, inferring that: ∑FX=FBX−S=0⇒FBX=S. The total force acting in the y direction is: ∑FY=FBY−mPg−Q(t)=mP aPY, where Q(t) is the total external force acting on the piston, including the force acting on the piston (PT), the friction caused by the impacts on the cylinder wall (Fr), friction from the piston surface and cylinder (μpS), the force caused by pressure acting on the piston bottom (PB is crankcase pressure), and the inertia force mP aPY .