MI-Partners
NeTTUN WP4 Progress
Advanced Ground Prediction System (Seismic)
Period September 2012 – February 2014
WP4 Seismic System
The goal of the NeTTUN seismic system is to visualize the ground in front of the TBM. Based on this information the TBM drilling parameters can be optimized. The seismic system hardware that is developed for NeTTUN consist out of a seismic source and multiple seismic sensors, both are the responsibility of MI-Partners.
MI-Partners Approach
As the NeTTUN Seismic Source and Seismic Sensor are highly dynamic systems, the development is done by means of Predictive modelling. The concepts and designs are made in NX and simulated in Ansys and Matlab. By using this approach the behavior of the system is known before it is built. The validation and optimization of the proto type (or first product) can be done by comparing and tuning the results to the simulations.
NeTTUN Seismic Source
In the first period of the NeTTUN project MI-Partners developed and built the seismic source according to the WP4 Specifications i.e. broadband frequency range, high repeatability, high accuracy and low distortion.
The result is a built and laboratory tested seismic source. The tests conclude that the performance of the source is as predicted and meets all minimum specifications and most of the target specifications.
In next period the seismic source will be tested on several locations in Europe. The testing is done by retrieving seismic data/records on well known seismic locations in a TBM configuration set-up.
NeTTUN Seismic Sensor
Beside the seismic source, MI-Partners has developed a seismic sensor to receive the reflected vibration waves of the seismic source. The main challenge of the sensor is the contrary requirement of a robust design and good decoupling for the geophone (sensor). The robust design is needed for the harsh environment and the decoupling between TBM and the ground is needed to retrieve good seismic data.
The Result is a Robust seismic sensor that extracts into the bore front with a special rubber compound decoupling that has been built and tested.
MI-Partners NeTTUN Team
Maryn Wijnhoven, Rob Jenneskens, Lucas Koorneef, Bastian Eenink, Ralph Reijnen, Elwin Boots, Rob Sanders, Ronald Faassen, Dick Laro Ronald Schneider and Leo Sanders
This is a video of the seismic shaker, created by MI-Partners.
