Gas turbine speed sensor problem

Hi Radha, Q1. what type of speed sensors are used? (eg, infra red reflective, hall effect, rotational encoder...?) Q2. What are the characteristics of the fluctuations observed during operation? Do they match 50 - 60 Hz frequencies? Or are the fluctuations randomized? Q3. Are the signal wires to the sensors routed the same as they exit the position of the sensors? Are they 2 wire or 3 wire sensors?

Covector's question is valid, although I would require more information. Rotating mass and RPM as well as level of magnatude of vibration. Location of sensors in relation to source of vibration. Is the wiring connection to the sensors connected via factory pigtail or via direct terminal connection on the wiring harness. Guage,length and capacitance of wiring in relationship to signal level and frequency. Sensity and dampening capabilty of instrumentation. Other factors can determined once these basic questions are answered.

hall effect IC will solve your problem I think or perhaps a magnetic pick-up.

In my experience, the speed sensor was mounted on the accessory gear box. This being the case, the routing of the cable from the pickup to the module was critical. This is, of course dependant on the rotating parts and any EMI generated by them, such as the electro-mechanical govorner in the Allison 501-K34 generator set. I would first look at the wire routing, as that may be the easiest and least expensive problem to fix. Then I would look at other pickup options that use a different signal form.