New Product Release: PT3000 Transmission System Diagnostic Simulator

The transmission system diagnostic simulator is a small simulation test bench, similar to the steam turbine system in power plants. It is a testing equipment for understanding the practical application of transmission system diagnostic simulators and sliding bearing oil film phenomena, and studying vibration control methods. This simulation test bench is a model that simulates a high-pressure single-stage turbine, with five disks corresponding to the blade structure, which can generate resonance up to the second critical speed. By using a motor drive, resonance can be clearly identified by simulating the process of rotor speed decrease or increase to test the waterfall diagram of rotor vibration. By inserting bearings that change the shape or clearance of the sliding bearing, we experimentally observe under what conditions the oil film problem of the sliding bearing occurs, such as oil film vortex, and adjust the oil pressure, temperature, and preload appropriately to produce oil film vortex and oil film oscillation, and can test the control conditions.

1: Introduction

The possibility of conducting various experiments

Similar to a steam turbine, a simulation test bench equipped with a long axis rotor can use sliding bearings to reproduce all kinds of vibration phenomena that occur in the rotor. You can test the mechanical vibration phenomenon that occurs in the rotor. Such as imbalance, shaft misalignment, blade friction and seal friction, looseness, and fluid phenomena. The TSBT series is specifically designed to test oil film phenomena based on the design and operating conditions of sliding bearings. Installing multiple rotor discs instead of turbine blades on the shaft can produce the second mode (the second critical speed), which can reproduce the fluid phenomenon (oil whirl and oil oscillation) of sliding bearings. Oil film vortex and oil film oscillation are important unstable phenomena in rotor supported oil film bearings. It is necessary to adjust the bearing load (rotor disk weight), bearing clearance (bearing seat selection), and oil pressure (oil supply valve adjustment) appropriately. If selected, oil film vortex and oil film oscillation can be simulated, and the waterfall diagram can clearly identify the characteristic signals of oil film vortex and oil film oscillation vibration. One of the key concepts in rotor dynamics is to predict the behavior of the rotor by identifying key and high points. TSBT uses a proximity eddy current probe installed in the 90 "direction and a key speed phase to analyze the axis trajectory based on the phase relationship between these two points.

2: Function

The rotor shaft is designed specifically for fluid sliding bearing rotor dynamics simulation:

Study the optimal equipment for rotor dynamics with various sliding bearings.

Lubricating oil system: pressure and temperature are controllable.

Install proximity eddy current probes in each bearing seat.

Separate the bracket bearing seat for easy replacement of the sliding bearing seat.

Provide various sliding bearing seats to study oil film phenomena

By installing the jack screws, it is easy to align the shaft.

By installing a dial gauge, it is easy to return to normal operation after misalignment testing.

3. Use of simulation test bench

3.1 Unbalance/On site Dynamic Balance

Install 5 rotor disks on the shaft, each with 18 M6 holes in the circumferential direction. By attaching mass at any position, the vibration and phase characteristics caused by imbalance can be studied, and on-site balancing can be carried out in an unbalanced state.

3.2 Axis misalignment experiment and alignment training

Install a jack bolt and a dial gauge on the motor base to move the motor forward and backward, introduce misalignment, and use a dial gauge to check the degree of misalignment. You can study changes in vibration or current by introducing the required parallel or angular deviation.

3.3 Friction experiment blade friction

Often causing problems with the steam turbine. In order to reproduce this problem, jack bolts were installed to cause friction in the vertical, horizontal, and axial directions of the rotor, and the friction can be reproduced by adjusting to any number.

3.4 Oil film fault test

When the shaft rotates in a circular journal bearing, it rotates due to the oil pressure difference (oil edge). This is called oil film vortex, even if the speed increases beyond the critical speed of the shaft, the phenomenon of oil film vortex still exists and causes rotational vibration on the shaft, which is called oil film vortex. This simulation test bench allows you to clearly observe the eddies and oscillations of oil, and aims to change the conditions under which oil film eddies and oscillations occur, making it the best product for studying this phenomenon.

The behavior of the 3.5 journal bearing experiment shaft rotating inside the journal depends on the shape of the bearing. In order to study the behavior of the shaft based on the shape of the bearing, we provide different types of clearances, different bearing lengths, and different cylindrical shapes (elliptical, pit shaped), allowing for in-depth research.

3.6 Rotor dynamics test based on oil pressure and temperature,

A simple oil system has been installed to supply oil to the journal bearings. By adjusting the temperature and pressure of the oil as needed, you can study the behavior of the shaft based on the temperature and pressure inside the journal bearing.

4. Measurement data

The axis trajectory diagram obtained from the displacement sensor installed vertically at 90 ° on the sliding bearing of the simulation test bench,

A. Under normal conditions

It displays very small vibrations (20um p-p)