ABSTRACT
In machine foundation, two types of problems may arise, namely (i) Machines directly mounted on foundation block may cause objectionable vibration, and (ii) Machine foundations suffer excessive amplitudes due to vibration transmitted from the neighboring machines. The first problem may be tackled by isolating the machine from the foundation through a suitably designed mounting system such that the transmitted force is reduced which in turn will reduce the amplitude. This type of isolation is termed as Force isolation or Motion isolation depending on its purpose. The second problem in which the vibrations are transmitted from the neighboring machines can be solved by controlling the vibration energy reaching the desired location. This is referred as vibration screening.
In this chapter both the concepts of vibration isolation and vibration screening have been explained using suitable mathematical modelling. This helped in getting the stiffeners of the pads which may be put either between machine and foundation, or between foundation block and concrete slab. Screening of vibrations using open trenches and pile barriers have also been included. Illustrative examples are given to demonstrate clearly the design procedure.
References and practice problems are added in the end of the chapter.
