Ramvib smart phone Vibration monitoring Martin Lollesgaard Existing Bridges and Monitoring MRTL@ramboll.dk

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

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

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

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

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

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

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

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

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

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

Thank you Martin Lollesgaard Existing Bridges and monitoring +45 6151 4662 mrtl@ramboll.dk Claus Madvig Petersen +45 6151 8725 cvp@ramboll.dk