Industrial structures frequently house vibrating equipment such as blowers, centrifuges, vibrating screens, etc. Floors that support this type of equipment must not only be sufficiently strong to carry the weight of the equipment but must also have elastic properties that result in a specific natural frequency. If the natural frequency of the floor is too close to the operating frequency of the equipment, the floor will vibrate excessively, causing discomfort to people that stand on the floor or, in more severe situations, resulting in damaged equipment.
The purpose of this course is to introduce practical methods available for finding natural frequencies of beams, to describe guidelines used in the design of industrial floor framing and to illustrate the principles discussed with design examples.
The course describes some of the methods available for obtaining values for the natural frequencies of beams. Methods vary from simply matching the situation at hand with published values in the literature, to simplified hand calculations, to use of computer programs. This course will provide a background that should result in a better understanding of the modeling requirements of computer programs and consequently lead to their proper application. Parameters important in the design of supports for vibrating equipment are presented, and typical values commonly used in industrial practice are described. Finally, two floor framing design examples are given. The first is of a floor that supports a vibrating screen; it is an example of "high tuning". The second is of a floor that supports a blower/fan; it is an example of "low tuning".