CENTRE FOR RESEARCH ON VIBRATION ISOLATION SYSTEM (CRVIS)ABOUT VIBRATION ISOLATION
Many industrial processes and equipment demand for active vibration isolation systems for their accurate functioning. Vibration isolation are of 2 types namely active vibration isolation and passive vibration isolation. Passive vibration isolation refers to vibration isolation by passive techniques such as rubber pads or mechanical springs. Active vibration isolation refers to vibration isolation by employing electric power, sensors, actuators and control systems.
An active vibration isolation system is developed using stacked piezoactuator. Amplitude and frequency of disturbing vibrations are measured in real time and a vibration signal out of phase by 180 degrees but of the same frequency is generated to nullify the induced vibration using stacked piezoactuator.
In active vibration isolation system, two piezoactuators are used. The first acuator is used to induce the vibration whereas the second piezoactuator is used for generating a vibration which is 180 degrees out of phase with the disturbing vibration. This will ensure vibration isolation of the instrument which is under consideration.
V i bration isolation Unit Platform for mounting stacked piezoactuators with laser displacement sensor
The figure above shows the mounting of stacked piezoactuators on a mild steel platform. A laser displacement sensor was used to measure the displacement.
The research work entitled “Experimental Investigations on Active Vibration isolation using Piezoelectric Actuators” won the best paper award in an International Conference entitled “Advanced Computing and Communication Systems” held in Sri Eshwar College of Engineering, Coimbatore, India during 19-21 December 2013.
1. “ Experimental Investigations On Active Vibration Isolation Using Piezoactuators” in Proceedings of International Conference on Advanced Computing and Communication Systems, organized by Sri Eshwar College of Engineering, Coimbatore during December 19-21, 2013.
1. NI PXle system NI PXIe system consists of NI PXIe- 1071 chassis, NI PXIe-8115 controller and NI PXIe 6363 X series data acquisition system. NI PXIe system is used to acquire vibration signals in real time and to generate a vibration which is 180 degree out of phase with the disturbing vibration.
NI PXIe SYSTEM
2. Pizoactuator stack assembly with Amplifier ML10x10x20 piezoactuator (displacement 20 micrometers, -20V to 150V, 0.2nm resolution from Cedrat Technologies, France) is used to generate and nullify the vibration signals. Amplifier is used to amplify the low frequency vibration signals.
Piezoactuator stack assembly with Amplifier
3. Laser Displacement Sensors ILD 1402-10 (10mm measuring range, 1 micrometer resolution) and ILD 2220-20 (20mm measuring range, 0.3micrometer resolution) laser displacement sensors are used for measuring the displacement of piezoactuators.