A STUDY OF SPRING RATES OF DYNAMICALLY LOADED HELICAL SPRINGS.
TEXAS A AND M UNIV COLLEGE STATION
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An objective of the research was to observe spring rates of helical compression springs under harmonic loading at other than natural frequencies. It was found that spring rates do not vary with loading frequency if the loading frequency is kept well below the fundamental natural frequency of the spring. The behavior of a spring which had a natural frequency of approximately 120 cycles per second indicated that when it was vibrated at approximately one fourth of natural frequency, its spring rate increased. The wave form of the dynamic forces at this frequency was believed to be caused by surging.