# A counter-rotating eccentric mass exciter consisting of two rotating 3.5-oz weights describing circles of radius r at the same speed

## Question:

A counter-rotating eccentric mass exciter consisting of two rotating 3.5-oz weights describing circles of radius r at the same speed but in opposite senses is placed on a machine element to induce a steady-state vibration of the element. The total weight of the system is 600 lb, the constant of each spring is k = 3400 lb/in., and the rotational speed of the exciter is 1200 rpm. Knowing that the amplitude of the total fluctuating force exerted on the foundation is 36 lb, determine the radius r.

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**Related Book For**

## Vector Mechanics for Engineers Statics and Dynamics

**ISBN:** 978-0073212227

8th Edition

**Authors:** Ferdinand Beer, E. Russell Johnston, Jr., Elliot Eisenberg, William Clausen, David Mazurek, Phillip Cornwell

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