By K. G. Bhatia
The functionality, security and balance of machines relies principally on their layout, production and interplay with surroundings. computer foundations will be designed in the sort of means that the dynamic forces transmitted to the soil throughout the origin, getting rid of all probably destructive forces. This guide is designed essentially for the training engineers engaged in layout of desktop foundations. It covers simple basics for figuring out and comparing dynamic reaction of computer beginning platforms with emphasis is on certain dynamic research for reaction evaulation. Use of commercially on hand Finite aspect applications, for research and layout of the basis, is usually recommended. concept is supported through effects from perform within the type of examples.
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In other words it can be said that every physical system has inherent damping associated with it. If we ignore damping, the system is called undamped system and if damping is considered, it is called damped system For better understanding of the dynamic behaviour of the SDOF system, the spring properties are considered linear and the presentation is developed in stages. Each stage contains its Mathematical Treatment and Example Problems. The stages considered are: 2-4 Single Degree of Freedom System I) Free vibration o Undamped System o Damped System 2) Forced vibration y :------J -------- y , , ~ Di,pI""d P",ition m'----; ',.
Foundation could either be a solid block resting diI:ectly on the soil or it may be resting on the piles. The foundation could also be a frame structure (Frame Foundation) resting directly on the soil or it could be resting on the group of piles. These interfaces, therefore, are essential to be appropriately addressed, for evaluating the dynamic response of the machine correctly. Thus, the three main constituents of machine foundation system that play significant role in overall controlling machine performance are, machine, foundation and soil and these need to be adequately addressed.
Overall centroid coordinates Amplitudes along X, Y & Z direction at DOF location '0' Amplitudes along X, Y & Z direction at Center of Foundation Top Amplitudes along X; Y & Z direction at Corners of Foundation Top Maximum Amplitudes in X, Y & Z direction at Foundation Top X, Y and Z Coordinate of load point Wmi X & Z Coordinates of machine centroid X1' x2' x3 Displacements of masses m1, m2, m3 in X-direction Y1' Y2' Y3 z1,z2,z3 Displacements of masses m1, m2, m3 in Y-direction Displacements of masses m1, m2, m3 in Z-direction x,y&z ]"" Differential of x, y & z with respect to time x,y&Z 2nd Differential of x, y & z with respect to time Yg Ground Acceleration in Y -Direction X, Y, Z Yf X, Y & Z Coordinate axes Height of Foundation Centroid Ym zp Height of Machine Centroid zp Acceleration ofpiston Displacement of Piston from its extreme position 1 MACHINES AND FOUNDATIONS • • • • • Overview Design Philosophy Foundation Types Tuning of Foundation Foundation Material • • • Soil Vibration isolation Field Perfonnance & Feedback j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j j Machines and Foundations 1-3 MACHINES AND FOUNDATIONS The performance, safety and stability of machines depend largely on their design, manufacturing and interaction with environment.