Showing papers on "Dynamic Vibration Absorber published in 1969"
Patent•
18 Dec 1969TL;DR: In this article, the minimum dynamic stiffness of a milling cutter and its holder, which form a spindle system, is increased by disposing a tuned damped vibration absorber, which comprises a damping mass supported by a viscoelastic material element, within the milling cutters.
Abstract: The minimum dynamic stiffness of a milling cutter and its holder, which form a spindle system, is increased by disposing a tuned damped vibration absorber, which comprises a damping mass supported by a viscoelastic material element, within the milling cutter. The element of viscoelastic material is retained within the damping mass by retaining means.
21 citations
TL;DR: Parallel damped dynamic vibration absorbers, modifying conventional absorber by adding subsidiary undamped absorber mass were used in this paper, which is a modification of the conventional vibration absorber.
Abstract: Parallel damped dynamic vibration absorbers, modifying conventional absorber by adding subsidiary undamped absorber mass
11 citations
Patent•
30 Jun 1969
TL;DR: In this article, a tuned DAMPED VIBRATION ABSORBER is proposed for a mass vocalization in more than one degree of freedom of motion, which is called CANTILEVER SPRING.
Abstract: A TUNED DAMPED VIBRATION ABSORBER FOR A MASS VIBRATING IN MORE THAN ONE DEGREE FREEDOM OF MOTION. IT CONSISTS OF A CANTILEVER SPRING AND ATTACHED MASS DESIGNED SO THAT THEY WILL ABSORB VIBRATIONS SIMULTANEOUSLY AT DIFFERENT FREQUENCIES IN CORRESPONDING DIFFERENT DEFREES OF MOTION.
9 citations
TL;DR: In this paper, a method for designing a vibration absorber, incorporating polymer spring/damping elements, for attachment to a complex main system is described, where the point of attachment can be remote from the position(s) of interest in the main system, for which any characteristic of absolute or relative receptance can be considered.
Abstract: This paper describes a method for designing a vibration absorber, incorporating polymer spring/damping elements, for attachment to a complex main system. The point of attachment can be remote from the position(s) of interest in the main system, for which any characteristic of absolute or relative receptance can be considered.Tests on a machine tool show that butyl rubber provides an effective and convenient damper material, even with main systems already possessing a high level of vibration damping, and that the addition of an absorber can effect a considerable improvement in the predicted performance of the machine. The addition of more than one absorber is likely to provide greater improvements.
4 citations
01 Dec 1969
TL;DR: In this article, a 750-foot cantilever length of extendible-tape boom was considered as the main system to be damped, and a number of tail lengths were tried from 20 feet to 80 feet after which 40 feet was investigated further as a desirable compromise between performance and practical lengths.
Abstract: A 750-foot cantilever length of extendible-tape boom (very low stiffness) was considered as the main system to be damped. A number of tail lengths were tried from 20 feet to 80 feet after which 40 feet was investigated further as a desirable compromise between performance and practical lengths. A 40-foot damping tail produced a damping effect on the main boom for the first mode equivalent in decay rate to 3.1 percent of critical damping. In this case the spring-hinge and tail were tuned to the main boom first mode frequency and the hinge damping was set at 30 percent of critical based on the tail properties. With this same setting, damping of the second mode was .4 percent and the third mode .1 percent.