Assessing inertia forces in a V-engine with the articulated connecting rods

Authors: Mikhina T.I., Vyalkov V.S.
Published in issue: #5(94)/2024
DOI:
Category: Power, Metallurgic and Chemical Engineering | Chapter: Heat Engines
Keywords: internal combustion engine, V8, trailer connecting rod, crank mechanism, piston acceleration, Fourier series, hodograph, inertia forces
Published: 18.11.2024

The paper studies the problem of determining values of the inertial forces acting in the crank mechanism of an 8-cylinder V-engine with the articulated connected rods. It considers connecting rods within the framework of an equivalent concentrated two-mass system. Accelerations of the main and trailer connecting rods pistons are separated into components of the 1st and 2nd orders using the Fourier series. The paper assesses influence of the trailer connecting rod geometry on the piston acceleration and on the inertial force value; significance of the difference in the translational moving masses of the right and left rows of cylinders in determining the inertial forces is shown. It is found that the scheme using a trailer connecting rod provides an angular shift in the inertial forces hodograph, as well as a decrease in the values of these forces.

References

[1] Chinov N.D., Krasnokutsky A.N., Myagkov L.L. Design and calculation of piston engines. Moscow, BMSTU Press, 2018, 536 p. (In Russ.).

[2] Connecting rod mechanisms of V-shaped engines. URL: https://dvigatelist.narod.ru (accessed 08.04.2024).

[3] Chinov N.D., Saltykov M.A., Myagkov L.L., Matisen A.B. Strength analysis of connecting rods of diesel locomotives using a step-by-step connection of macronutrient and finite element models. Engine Building, 2004, No. 4, pp. 3–5. (In Russ.).

[4] Vallejo Maldonado P.R., Gusarov V.V., Chinov N.D. Dynamic calculations of piston engines with complex kinematic schemes. Part 2. Truck, 2020, No. 2, pp. 3–7. (In Russ.).

[5] Myagkov L.L., Strizhov E.E., Malastovskii N.S. Modeling of the Thermal State of the Diesel Cylinder Cover with Allowance for Liquid Flow in the Cooling Cavity. Heat Transfer Research, 2008, vol. 39, iss. 8, pp. 685–694. https://doi.org/10.1615/HeatTransRes.v39.i8.40

[6] Myagkov L.L., Malastovsky N.S., Dyakova L.N., Blinov A.S. Investigation of the stress-strain state of the cylinder cover of a high-powered diesel engine. News of higher educational institutions. Mechanical Engineering, 2015, No. 2, pp. 42–52. (In Russ.).

[7] Myagkov L.L., Malastovsky N.S., Blinov A.S. A refined method for calculating the crankshaft for endurance, taking into account torsional vibrations. The 7th Lucanian Readings. Solving energy and environmental problems in the motor transport complex. International Scientific and Technical conf.: tez. dokl. Moscow, MADI Publ., 2015, pp. 89–91. (In Russ.).

[8] Diesel D49. URL: https://www.kolomnadiesel.com/catalog/diesels/ (accessed 08.04.2024).

[9] Zaikin A.E., ed. Aircraft engines. Design and calculation of engines. Moscow, Military Air Force of the Order of Lenin K.A. Zhukovsky Academy Publ., 1941, 39 p. (In Russ.).

[10] Yamanin A.I., Zharov A.V. Dynamics of piston engines. Moscow, Mashinostroenie Publ., 2003, 464 p. (In Russ.).