Vibration damping of the anti-vibration platform intended for use in combination with audio/music devices

Abstract

The article presents research on the damping properties of an anti-vibration platform (designed and manufactured by Stacore), which is intended for use in combination with high class audio devices. The platform comprises two parts that are capable of passive vibration damping. The design of this platform is unique and has been developed by applying several technical solutions in a combination not found on any other anti-vibration platform on the audio market. These solutions are described in the article. The first part of the platform is pneumatically operated and the second part uses ball bearings. The casing also fulfils the most important function – vibration damping. It is made of amorphous slate (known for its good vibration-damping properties) and includes a metal plate covered with a special visco-elastic layer that fulfils the role of binding material. The first part of the platform realises the pneumatic damping. It comprises four elastomer pneumatic springs, each with its own air tank. The air tanks are designed to operate at a maximum pressure of 5 bar. The second vibration-damping part of the platform is located above the first part (pneumatic) and consists of ball bearings, used for the isolation of transverse vibration, being relatively difficult to deal with pneumatic springs. The upper part consists of three bearings, each of which comprises of a polished, deep hardened steel racings and a ball made of tungsten carbide. The scientific literature describes many solutions enabling vibration damping, including many anti-vibration platforms. However, the literature lacks the descriptions of analyses conducted on anti-vibration platforms for audio devices. This article is a novelty in the literature as it concerns the experimental research aimed at verifying the vibration-damping capacity of the anti-vibration platform that can be used with audio devices owned by people who appreciate high-quality music. The article describes in detail the whole measurement procedure applied to the vibration damping platform. For research purposes, the anti-vibration platform was suspended on flexible ropes. At first, an electromagnetic vibration exciter was attached to the base on which the platform rested, and then the displacements of the upper and lower part of the platform were measured using laser sensors. Based on these signals, the vibration damping capability (transmissibility) of the platform was determined in two mutually perpendicular directions. In addition to the graph that shows the vibration damping capability of the anti-vibration platform, the signals of the applied force and displacements measured during the research are also presented in this article.

Dynamic Ramsey Theory of Mechanical Systems Forming a Complete Graph and Vibrations of Cyclic Compounds

“…Thus, we conclude that the Ramsey approach is applicable for modeling of viscoelastic media [18][19][20][21], namely: vibrating systems partially interconnected by springs and par- Elastic links are shown in black, whereas viscous connections are shown in red. For the sake of simplicity, we consider the complete graph, similar to that shown in Figure 5.…”

“…The eigenfrequencies inherent for these triangles are ω eigen = 3k 2m ; 3k 2m ; 3k m . Thus, we conclude that the Ramsey approach is applicable for modeling of viscoelastic media [18][19][20][21], namely: vibrating systems partially interconnected by springs and partially with viscous elements may be described with the Ramsey approach. Of course, there exists the possibility that no "elastic" triangles will be present in the graph and only viscous ones will appear.…”

Performance Analysis and Restrictor Structure Improvement of an Internal Feedback Hydrostatic Turntable Oil Pad Considering Internal Flow

“…As a result, the discretized moment matrix becomes considerably large. The Gauss−Seidel iteration [ 30,31 ] is a numerical technique employed for solving systems of linear equations, making it a valuable approach for addressing such large‐scale linear systems. Equation (11) corresponds to a system of linear equations involving r pieces × θ pieces unknowns and r pieces × θ pieces equations.…”

Dynamic Ramsey Theory of Mechanical Systems Forming a Complete Graph and Vibrations of Cyclic Compounds

“…. Thus, we conclude that the Ramey approach is applicable for modeling of viscoelastic media [16][17][18][19] , namely: the vibrating systems partially interconnected with the springs may be described with the Ramsey approach. Of course, there exists the possibility that no "elastic" triangles will be present in the graph, and only viscous ones will appear.…”