1. How does Aviso's engine monitoring system REDS measure?
We measure by placing a sensor on the fly wheel of the crankshaft. The sensors measures the accelerations and de-accelerations in the rotation of the fly wheel. These accelerations and de-accelerations define the magnitude of the disturbances in the combustion cycle of the engine. The second sensor, that is optionally placed to measure the CAM signal, is placed to determine in which specific cylinder the measurement concerns.
To configure REDS for a specific engine we only have to enter a few generic engine details; the number of cylinders, the firing order, the number of teeth on the fly wheel, the RPM and if it’s a 2-stroke or 4-stroke engine.
2. What are the advantages of REDS?
The most important advantages are:
- Fuel savings. Research by Bureau Veritas has even shown that there is a 1:1 relation between the percentage of imbalance in the engine and the percentage of additional fuel used.
- Lowering emissions; this makes it less expensive to comply to IMO tier 3.
- Lower maintenance costs due to optimization of maintenance planning and maintenance execution based on engine performance instead of operating hours.
- Availability of the engine, less (unplanned) downtime.
- Increasing the life-span of the engine.
- Preventing damages and (possible) consequential damages.
- REDS also offers advantages in the area of safety on-board.
3. Measuring invasively. What does that mean?
The conventional method of determining the condition of an engine is done by measuring specific parts in and on the engine. Temperature, Pressure, Vibrations and Flow, whereby the results of the measurements are compared to the values set on the test mode of the engine. To measure this way multiple sensors need to be placed of which the recorders must be placed inside the engine. Measuring INSIDE an engine is called invasive measuring.
REDS doesn’t measure inside the engine, it only measures externally, non-invasively.
4. What are dynamic torsional vibrations?
Dynamic torsional vibrations are vibrations that originate as a result of variations in the angular velocity of a rotating object. After all, the crankshaft of an engine doesn’t turn at a constant speed.
5. Where can REDS be used?
REDS is applicable on all piston engines (and piston compressors), whether they run on gasoline, diesel or gas.
6. How can REDS predicts engine (part) failure?
Because REDS continuously measures the torsional vibrations, compares the pattern with previous measurements and calculates further into the future it’s possible to make predictions.
7. Is REDS expensive?
The answer to this question correlates tot the returns and cost savings of the system such as fuel savings, lowering of maintenance costs and preventing damages. The saving on costs due to (unplanned) downtime are also enormous.
A specific example with regards to saving on fuel costs:
By saving 1- 3% on fuel due to running the engine in a balanced state, the investment in REDS on a 1.500 TEU Container Feeder, is recovered in 2 to 6 months.
8. Is REDS easy to install?
Installation only includes the placing of a small data acquisition box, 1 external sensors on the flywheel of the crankshaft, and a panel pc. The time for installation and configuration is about 1 day.
9. Is it possible to see the REDS measurements online?
If internet is available on board the measured data results can be viewed anywhere. Also on a smartphone or tablet.