dorsal/arxiv
View SchemaTaber Vibration Isolator for Vacuum and Cryogenic Applications
| Authors | Hilton W. Chan, Joshua C. Long, John C. Price |
|---|---|
| Categories | |
| ArXiv ID | physics/9812027 |
| URL | https://arxiv.org/abs/physics/9812027 |
| DOI | 10.1063/1.1149839 |
Abstract
We present a procedure for the design and construction of a passive, multipole, mechanical high-stop vibration isolator. The isolator, consisting of a stack of metal disks connected by thin wires, attenuates frequencies in the kilohertz range, and is suited to both vacuum and cryogenic environments. We derive an approximate analytical model and compare its predictions for the frequencies of the normal modes to those of a finite element analysis. The analytical model is exact for the modes involving only motion along and rotation about the longitudinal axis, and it gives a good approximate description of the transverse modes. These results show that the high-frequency behavior of a multi-stage isolator is well characterized by the natural frequencies of a single stage. From the single-stage frequency formulae, we derive relationships among the various geometrical parameters of the isolator to guarantee equal attenuation in all degrees of freedom. We then derive expressions for the attenuation attainable with a given isolator length, and find that the most important limiting factor is the elastic limit of the spring wire material. For our application, which requires attenuations of 250 dB at 1 kHz, our model specifies a six-stage design using brass disks of approximately 2 cm in both radius and thickness, connected by 3 cm steel wires of diameters ranging from 25 to 75 microns. We describe the construction of this isolator in detail, and compare measurements of the natural frequencies of a single stage with calculations from the analytical model and the finite element package. For translations along and rotations about the longitudinal axes, all three results are in agreement to within 10% accuracy.
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"abstract": "We present a procedure for the design and construction of a passive,\nmultipole, mechanical high-stop vibration isolator. The isolator, consisting of\na stack of metal disks connected by thin wires, attenuates frequencies in the\nkilohertz range, and is suited to both vacuum and cryogenic environments. We\nderive an approximate analytical model and compare its predictions for the\nfrequencies of the normal modes to those of a finite element analysis. The\nanalytical model is exact for the modes involving only motion along and\nrotation about the longitudinal axis, and it gives a good approximate\ndescription of the transverse modes. These results show that the high-frequency\nbehavior of a multi-stage isolator is well characterized by the natural\nfrequencies of a single stage. From the single-stage frequency formulae, we\nderive relationships among the various geometrical parameters of the isolator\nto guarantee equal attenuation in all degrees of freedom. We then derive\nexpressions for the attenuation attainable with a given isolator length, and\nfind that the most important limiting factor is the elastic limit of the spring\nwire material. For our application, which requires attenuations of 250 dB at 1\nkHz, our model specifies a six-stage design using brass disks of approximately\n2 cm in both radius and thickness, connected by 3 cm steel wires of diameters\nranging from 25 to 75 microns. We describe the construction of this isolator in\ndetail, and compare measurements of the natural frequencies of a single stage\nwith calculations from the analytical model and the finite element package. For\ntranslations along and rotations about the longitudinal axes, all three results\nare in agreement to within 10% accuracy.",
"arxiv_id": "physics/9812027",
"authors": [
"Hilton W. Chan",
"Joshua C. Long",
"John C. Price"
],
"categories": [
"physics.ins-det"
],
"doi": "10.1063/1.1149839",
"title": "Taber Vibration Isolator for Vacuum and Cryogenic Applications",
"url": "https://arxiv.org/abs/physics/9812027"
},
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