ABSTRACT: Small vibrations of a cylindrical shaft caused by inertial excitations are studied in this paper. The shaft is vertically situated. It consists of two sections with different cross sections. It is supported by a spherical and a cylindrical joint. The two supporting devices have horizontal elasticity. Between the two supports, and also at the […]
A18: Vibrations of Shaft Caused by Inertial Excitations Read More »
ABSTRACT: In this article, new equations called Condensed Lagrange equations (CLEs) are defined. With their help, the rigid body’s absolute general motion is studied. The rigid body is considered to be homogeneous and unsymmetrical. CLEs are similar in structure to the classical Lagrange equations from the second type, applied in vector-matrix form, but CLEs are
A17: Condensed Lagrange Equations in Theoretical Mechanics Read More »
ABSTRACT: In this article, a rigid body’s absolute general motion is studied. The rigid body is assumed as homogeneous and unsymmetrical. New additional kinetic characteristics are used. The most important of these are the following: the vector-real generalized velocity of the rigid body, the vector generalized impulse of the rigid body, and the vector-real generalized
A16: Theorem for Change of Generalized Impulse in Theoretical Mechanics Read More »
ABSTRACT: This theoretical article continues the study of the small three-dimensional vibrations of two rigid bodies. Here, they are connected not only with elastic but also with viscous damping elements. The main task of this study is also to show how is composed the system of differential equations and how is determined the damping matrix. The
CP10: Theoretical Study of Small Vibrations of Two Rigid Bodies with Damping Read More »
ABSTRACT: The small three-dimensional vibrations of two rigid bodies connected with elastic elements are studied in this research. The main task in the paper is to show how the system of differential equations is formed, which describes these vibrations without considering the damping. For determining the stiffness matrix, the Finite Element Method (FEM) is used. The
CP09: Theoretical Study of Small Vibrations of Two Rigid Bodies without Damping Read More »
ABSTRACT: In this conference paper, new equations called Condensed Lagrange equations (CLE) are defined. With their help, the rigid body’s absolute general motion is studied. The rigid body is considered to be homogeneous and unsymmetrical. CLE is similar in structure to the classical Lagrange equations from the second gender, applied in vector-matrix form, but CLE are
CP08: Condensed Lagrange Equations Read More »
ABSTRACT: In this conference paper, a rigid body’s absolute general motion is studied. The rigid body is assumed as homogeneous and unsymmetrical. New additional kinetic characteristics are used. The most important of these are the following: the vector-real generalized velocity of the rigid body, the vector-generalized impulse of the rigid body, and the vector-real generalized force
CP07: Theorem for Change of the Rigid Body Generalized Impulse Read More »
VSU “Lyuben Karavelov” XVIII Anniversary International Scientific Conference by Construction and Architecture, 18–20 October 2018, Sofia, BULGARIA https://1drv.ms/b/c/b9f980bbcaa2448f/IQC5zzGeeU49TLNOnShPVTRBASVjzmpeHS1QXnyZQ7qaHjU?e=MXpQ3D
PR09: Condensed Lagrange Equations Read More »
VSU “Lyuben Karavelov” XVIII Anniversary International Scientific Conference by Construction and Architecture, 18–20 October 2018, Sofia, BULGARIA https://1drv.ms/b/c/b9f980bbcaa2448f/IQDuP0uy8c40RbxUQ96uBldeATlvnFuM29U-1ih5Tp1a8HQ?e=lT8QE6
PR08: Theorem for Change of the Rigid Body Generalized Impulse Read More »
ABSTRACT: The absolute motion of an arbitrary asymmetric rigid body is studied. This motion is determined after its relative motion has been obtained. The most important peculiarity in this dynamical rigid body model is that the selected pole does not coincide with its mass center. Seven new kinematic characteristics have been defined. The first ones
A15: Theoretical Matrix Study of Rigid Body Absolute Motion Read More »
ABSTRACT: The relative motion of an arbitrary asymmetrical rigid body in this article is studied. Three new additional kinematic characteristics are defined, namely, vectors-real absolute, transmissive, and relative generalized velocity. A new theorem for summation of the rigid body’s real generalized velocities, with these new additional kinematic characteristics, is formulated. Using the final differential equations
A14: Theoretical Matrix Study of Rigid Body Relative Motion Read More »
ABSTRACT: In this paper, the trajectories of a soccer ball for the most important kicks in the football game – a corner kick and a direct free kick are studied. The soccer ball is modeled as an ideal rigid hollow spherical body with six degrees of freedom, which performs a general motion in an immovable
A13: Study of Soccer Ball Flight Trajectory Read More »
ABSTRACT: The forced three-dimensional vibrations of a machine unit “electric motor-compressor”, mounted on the wagons of electric trains from the traction of “BDZ” EAD in this work are studied. The purpose of the work is to determine the parameters of the vibrating insulation of the unit that is suspended on three vertical supports to the
ABSTRACT: In this paper, the forced three-dimensional vibrations of a machine unit mounted on the wagons of the electric modular trains are studied. The unit is suspended on three vertical supports to the wagon frame. A vibrating isolation assembly is constructed at the top end of each carrier. The unit is accepted as an ideal
ABSTRACT: Vibrations resulting from powertrain work and auxiliary equipment reduce the comfort, reliability, and durability of the vehicles. The vibration levels transmitted to the passenger compartment and the emitted structural noise depend mainly on the efficiency of their vibration isolation with respect to the vehicle body. The work presents an experimental determination of the vibration
A10: Experimental Determination of Vibration Levels of Electric Compressor Aggregate Read More »
