10-02-2016, 04:38 PM
The vibration measurements were done with proximity systems which were mounted on all three journal bearings of the turbine. Two transducers were mounted on each journal bearing, with a radial direction and at an angle of 90 degrees between them. The TopMessage system was mounted within an portable electric panel. The customer requested that the system must be portable to be mounted on different hydro turbines that present electrical or mechanical faults. Beside this, the system had to be modular so that it could be extended in the future, for example: for making absolute vibration measurements with piezoelectric accelerometers.The vibration diagnosis indicated a misalignment of the turbine’s shaft, but this offsetting is caused by the instability of the inferior radial bearing LRI, practically an increased mechanical looseness inside this bearing having the Y direction.absolute vibration measurements were done with accelerometers using a portable analyser and the highest vibrations were recorded on the radial axial bearing LRAx, and on the inferior radial bearing the vibrations amplitudes were small. In conclusion we can say that the machine diagnosis which have in their assembly journal bearings are done more precisely if the vibration measurements are done with
proximity transducers and are acquired using the on-line mode, simultaneously on all the bearings of the machine. For this purpose the TopMessage system was one to be appreciated and our customer was pleased.
Summary of Benefits:
The advantages of vibration monitoring using the TopMessage system and the Profisignal software are as follows:
¾ Simultaneously monitoring of vibration amplitudes on all the bearings of the machine
¾ The possibility of extending the system for on-line monitoring and other technical parameters, except vibrations, needed for machine diagnosis
¾ The creation of virtual channels for the calculation of jocurilor in the journal bearings
¾ The possibility of copying the measured data – amplitude 1x and phase 1x – in a balancing program which allows the balancing, in situ, static and dynamic of the rotors.
The precession movement simulation of the shaft within the journal bearings
¾ The transmission with ease of the remote measured data and the storing of these
both within the TopMessage device and on the hard disk of a computer.
¾ The possibility to connect vibration transducers with an output of 4-20 mA as an economical solution for vibration monitoring
¾ The increase in safety conditions and the prevention of machine damage with the help of the Alarm Management software and the analog and digital outputs which the TopMessage system has.