Methods | KTI Projekt

Simulation device

In 2007 the research team engineers developed a simulation device at ifms, which allows the reproduction of any type of regular movement in one direction. As part of the ongoing CTI project the device has been continuously updated and adapted to meet changing requirements. Paintings of up to 90 x 70 cm can be mounted on the moveable base and tilted against the axis of activation.

Motors: 4 voice coils
Max. acceleration: 50m/s² (at 20kg effective load)
Distance: 70mm
Frequency: 0-100Hz
Regulation: dSpace Rapid Prototyping and cRIO from National Instruments

Video of vibration track

Measuring technique

Measurement of fabric vibrations (emission):
– Uniaxial accelerometer
– Triangulation laser
– Laser Doppler vibrometer
– High-speed camera

Emission measurement:
– Triaxial accelerator sensors on the stretcher and transport box

Measuring of the transmission behaviour (frequency response) to determine the oscillation frequencies:
– Simulation device + Accelerator sensors + Spectrum analyser

Test painting

The concept of the test painting involves a reproducible preparation method: material coating, composition and thicknesses are as close as possible. The second central aspect is considerably more complex: how to simulate the fragility of real paintings? This was done by restorers from the research team developing a concept integrating selected criteria (e.g. loss of adhesion between paint layer and support), which make paintings more fragile and can be reproduced with test paintings. The representativeness of the test paintings is thus not transferable to individual real paintings but to paintings that display classic signs of fragility.

Monitoring real transport

To accompany the series of laboratory measurements, the research team records shock and vibration levels during real transports.

Special packaging concepts for the paintings were developed in each instance. The following measuring methods were used:
– Triaxial (movement of transport boxes) and uniaxial accelerator sensor (vibration of canvas)
– Laser-double-vibrometer (vibration of canvas)

The research team placed particular emphasis on monitoring the transport of fragile large paintings. (See: current archive)

Gallery

Results

The first results characterize the emission and valuation of the effectiveness of the current vibration and reverse end protection methods. By continually assessing the laboratory measurements and monitoring the modes of transport, the team can envisage a series of measurements to assess current packaging systems. Implementation is scheduled for summer 2011.

In 2012, the final results of the research project should be presented and published.