Ni labview 2012

A custom-made WBV simulator (Jalilian et al., 2019[28 (link)]) that included an adjustable car seat (Peugeot 405 driver seat, IK Co, Tehran, Iran) attached to a metal frame structure, a tactile transducer (ButtKicker LFE transducer, The Guitammer Co, Westerville, OH, USA) that was placed at the center of the metal structure, and an amplifier (ButtKicker BKA1000-N Power Amplifier, The Guitammer Co, Westerville, OH, USA) was utilized in this study (Figure 1(Fig. 1)). Vibration signals were generated by NI LabVIEW 2012 (National Instruments, Austin, TX, USA) and amplified to create three axial sine waves at different frequencies and intensities.
Unweighted vibration was set to sine waves with a frequency of 3-20 Hz and an intensity of 0.5 m/s² to simulate moderate vibration according to ISO 2631-1: 1997 (ISO, 1997[25 ]). The exposure of participants was monitored in real time using a SVAN 958 vibration analyzer with an SV 39A whole-body seat accelerometer (SVANTEK Sp. z oo, Warsaw, Poland), placed on the supporting seat surface (under ischial tuberosity).
A monitor and keyboard holder was set up with no connection to the WBV simulator and the hands of the participants had no contiguity with the simulator. Therefore, the monitor setup did not vibrate alongside with the metal frame and participants during the trials.

The PVDF sensor had dimensions of 41.40 × 16.26 mm² and was made up of a piezoelectric PVDF polymer film with 28 μm thickness laminated onto 0.125 mm thickness polyester. The sensitivity of the PVDF film was 13 mV/N. Output signals from the sensor were amplified by 40 dB and stored in PC using a data acquisition board (NI USB-6361, National Instruments, Austin, TX, USA) and LabVIEW (NI LabVIEW 2012, National Instruments, Austin, TX, USA). By considering the sensitivity of the PVDF film, amplification gain, and the spot size of laser irradiation, the sensitivity of the PVDF transducer was recalculated in terms of pressure, i.e., 235.2 mV/MPa, and used to convert the output signals in mV to MPa. One hundred one-pulse single shots were repeatedly performed at each energy level and output signals were averaged for improving the signal-to-noise ratio (SNR). Any damage to the sample was checked every ten single shots using a digital microscope (AM3713TB, AnMo Electronics Corp., Taiwan). Output signals were processed with home-built programs based on MATLAB (R2008a, Mathworks, Portola Valley, CA, USA).