Our customer's needs

Running shoesIn footwear manufacturing, the transmission of impact force is a major issue.

In order to reduce the vibrations transmitted through the bones, which are not controlled by muscles and tendons, it is essential to offer insoles with good damping capacity. In particular, this helps to limit joint pain and cartilage degeneration by reinforcing natural damping mechanisms.

In the development of insoles for running and running shoes, shock dissipation and pressure distribution are all the more important due to the duration and intensity of impacts during sporting activities.

Controlling the damping capacity of shoe soles is therefore an essential part of R&D and quality control. Our customer called on Andilog to measure the force at a given displacement on certain points of its soles.

Stentor II - Single-column test rig up to 5,000NThe Andilog solution for sole testing

To meet our customer's needs, we chose a universal computer-controlled test machine Stentor II CC and equipped with a force sensor with a capacity of 1000N and a compression plate of 50 mm.

The company wanted to visualize the force and displacement curve in real time with high resolution, and save the test curves for later analysis. To achieve this, we proposed the test software Califort which enables the test machine to be driven in sequence, with precise tracking of force and displacement values.

Protocol description

The force transducer is mounted on the machine's measuring head by means of its thread. The compression plate is inserted. In the control software, we indicate the displacement sequences and stop conditions we wish to set up, and go to the test menu.
The test protocol has been defined as follows to measure the compression force on the soles:

  • With a simple click on Califort's "Start" button, the frame is lowered onto the footplate until a preset force of 1N is reached.
  • It then performs a force and displacement tare
  • It performs a pre-load by descending at a speed of 100mm/min in the base plate up to 10 mm and then returns to the initial 0 mm position.
  • Measurement recording starts at this point, and the measuring head performs the previous action over 4 cycles to compare the differences in values.
  • At the end of the measurement, the measuring head returns to its initial position and Califort automatically saves the measurement taken, which is then available in the "Analysis" tab.

Reasons for choosing this system

Insole test curveThe Stentor II CC chosen for this project enables precise force measurement to within 0.1% of the transducer's maximum capacity. Thanks to its included Califort software, it displays the force/displacement curve in real time with a frequency of 1000 Hz and up to 4 automatic calculations. Its sequence-based programming makes measuring easy and gives you repeatable results. Finally, the report-editing interface ensures unrivalled traceability of your measurements.

Precise long-term measurement

Like all measuring systems, the Stentor II CC deforms over time, depending on the forces applied to the column. To compensate for these deformations, Andilog has developed compensation profiles in Califort that enable the displacement transducer to be adjusted, thus ensuring the long-term accuracy of your measurements.