Characteristics of shape memory metal and alloy mesh dampers

Metal mesh is commercial material that is used in the diverse applications for example filters, screens, engine sheath and vibration absorbing and sealing. The first use of mesh was as a rotordynamic damper with ball bearings to act as a bearing support damper in the gas bearings. The damping and stiffness properties are compared for stainless steel and Inconel 600.

A force vibration response experiment is conducted for the damping and stiffness results. The outcomes are noticed for three values of vibration amplitudes and frequency range of 20 to 300 Hz for a mesh density of 30%.

Stainless steel mesh appears to offer similar damping values as of copper.

Inconel mesh has lower value of damping coefficients.

According to the results, the copper mesh dampers attain a reducing damping coefficient with increase in vibration amplitude and frequency. This behaviour was also noticed with stainless steel and Inconel mesh materials. Another material taken Nickel-Titanium shows increased damping coefficient with increase in vibration amplitude value.

In another test of transient vibration, impulse response based method is used to recognize the features of mesh damper. This test utilized the transient response of the system and Hilbert conversion to find the system factors. It is applicable to linear and non-linear systems.

Incoloy 800H mesh, incoloy mesh

The transient vibration system is designed for the analyses that included double parallel installed dampers covered by aluminium on a stationary mandrel. During conducting these analyses, the vibration loss measurement was noticed from the impact hammer and the comparable motion of aluminium housing was assessed.

In this test, two mesh dampers were tested of 30% mesh density- copper mesh and nickel-titanium alloy wire mesh. The stiffness of both mesh materials were found to be based on vibration amplitude. However their stiffness varies with vibration level, the vibration amplitude dependencies are related to each other for two mesh dampers excluding their lowest vibration amplitudes.

The damping features of these meshes are noticeably different. Although the damping values of both mesh materials are based on the vibration amplitude. In case of copper mesh damper, the damping value decreases at vibration amplitude above 3 microns. Although for the shape memory mesh damper, the damping value improves with vibration amplitude. The damping value is maximum at 3 microns. Although for the shape memory mesh damper, the damping value improves with vibration amplitude. For vibration above 8 microns, the alloy mesh performs better than copper mesh. The Ni-Ti alloy mesh damper shows double damping value than copper mesh.

Evaluation of the damping and stiffness attributes of various metal mesh dampers created from the different materials is performed. It was found that the common materials for example, steel, Inconel and copper showed reduction in damping and stiffness values with increase in vibration amplitude. The outcomes for copper confirm with earlier tests by using frequency and amplitude controlled analyses. The alloy mesh also described the stiffness factor that reduces with increase in vibration amplitude. So the copper mesh showed better performance than the traditional materials for working as a damper material.

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