1. Ramvib smart phone Vibration monitoring
Martin Lollesgaard
Existing Bridges and Monitoring

2. Ramvib, smart phone Vibration monitoring
Why & what
Vibration measurements can be carried out with a smart phone using the accelerometers integrated in the phone.
Simple, efficient and economic way of carrying out vibration measurements. Compact “all in one” measurement unit.
Vibration measurements on guyed mast in Sweden carried out with smart phone and commercial app.
Develop an app to carry out simple, one point vibration measurements.
Rambøll app enables possibility of further development and provides full control of measurement settings and functionality.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

3. Ramvib, smart phone Vibration monitoring
HOW
Develop a Rambøll app in cooperation between 4 Rambøll departments.
Phase 1, 2017: Simple app, Start and stop button.
Phase 2, 2018: Include graphical presentation, time series and frequency spectre.
Phase 3, 2018: Cable tension module. Estimate cable tensions from measured natural frequencies.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

4. Ramvib, smart phone Vibration monitoring
Phase 1 (2017)
Simple app, short term and long term measurements.
Developed in android.
Vibration measurement in 3 directions.
Parameters indicating quality of measurement.
Storage in 1 hour data files (for long term measurements).
Transfer to PC as mail attachment or by USB cable.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

5. Ramvib, smart phone Vibration monitoring
Phase 2 (2018)
App extended with graphical output.
Plot of measured time series
Plot of calculated frequency spectrum
Data storage in csv-files or binary format
Example of use: Dynamic sensitive foot bridge.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

6. Ramvib, smart phone Vibration monitoring
Phase 3 (2018)
Cable tension module
Estimation of cable tension based on measured natural frequency
Input parameters: Mass, length and orientation of cable
Fast and simple compared to traditional tension measurement.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

7. Ramvib, smart phone Vibration monitoring
Measurement precision
Vibration amplitude, typical deviation ±10%.
High precision of measured frequencies.
Calibration.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

8. Ramvib, smart phone Vibration monitoring
Pre-Study - Large Bridges
Large Bridges – dynamic sensitive.
Example: Great Belt Bridge
Investigate vibration levels, natural frequencies, damping levels
Calibrate theoretical models.
Determine setup of permanent measuring system
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

9. Ramvib, smart phone Vibration monitoring
Key BENEFITS
Possibility to carry out low cost vibration measurements.
Simple check of natural frequencies and vibration levels. Anyone can do the measurement.
Ideal for remote areas.
Cable tension module provides simple, time saving way to measure and check cable tensions.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

10. Ramvib, smart phone Vibration monitoring
Implementation and Future work
To be downloaded from Google play.
Coming up:
version for Iphone.
automatic data transfer to server (global database and ML).
damping analysis module.
other sensors (internal and external).
reporting module.
alarming module.
etc.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

11. Ramvib, smart phone Vibration monitoring
Key takeaways
Rambøll app for vibration measurements is being developed.
Possibility to carry out simple one point vibration measurements, fast and to low costs.
Measurements may be carried out by anyone.
Great potential for further development.
Remember you only have 10 minutes to the whole presentation:
Please use images if you have any relevant in a reasonable quality (It is better to use images to illustrate, what you want to say)
Be as concrete and precise as possible
Use as little text as possible
Only few bullets

12. Thank you Martin Lollesgaard Existing Bridges and monitoring
Claus Madvig Petersen