Abstract:

Is stated the dynamic analysis of the crank-piston mechanisms applied in pumps and compressors for the oil and gas transportation, with taking into account the clearances in kinematic pairs and the elasticity of links. Using known methods of structural mechanics without generation of differential equations in partial derivatives with taking into account the clearances is defined deformation of coupler with distributed masses. Is found reduced stiffness coefficient of mechanism. The mechanism is considered as a two-mass model (motor, mechanism) and is obtained a system of differential equations. To study the vibration process mass model is considered as a system with one degree of freedom. The ways of origin of resonance, its definition and impact of friction forces on the work of mechanism are shown. Due the computer technology is carried out a dynamic analysis of crank- piston mechanism with clearances in kinematic pairs and elasticity of links. Is defined the elastic deformation of rod, depending on the stiffness and crank rpm. Due the comparative analysis of the ideal and real mechanisms are revealed and defined that for reliability and durability of piston mechanisms would be considered not only the optimal values of clearances in kinematic pairs and deformation of links, but also the structural, mechanical and physical -chemical state of materials, loads, kinematics, thermodynamics and lubrication.

Keywords: crank-piston mechanism; dynamical research; elasticity of links; deformation; resonance; reliability