Table 2 Components and technical specifications of the pneumatic AF measuring system
System components (company) | Specification |
|---|---|
Compressor (JUN-AIR International A/S, Nørresundby, Denmark) | Model 6, Serial-No. 702997; Condor MDR2 EN 60947–4-1; max. system pressure: 8 bar; calibrated to max. 3 bar |
2 bellows cylinders (Zitec Industrietechnik GmbH, Plattling, Germany) | SP-2 B04 R; twofold, Ø 165 mm, max force: 9 kN, stroke length: 1–110 mm (adjustable), rise time: 0.1–30 s continuously |
Control unit (Seifert Drucklufttechnik GmbH, Bernsbach, Germany) | Pressure reduction to max. 1 bar |
Pressure sensor in control unit (Seifert Drucklufttechnik GmbH, Bernsbach, Germany) | Linear 1 V = 1.05 bar |
2 strain gauges and amplifiers (modified by co. Biovision, Wehrheim, Germany) | MLMZ_2000N_67 linear, 1 V = 191.72 N MLMZ_2000N_36 linear, 1 V = 194.72 N |
3 acceleration sensors (ACC) (modified by co. Biovision, Wehrheim, Germany) | Sensitivity 312 mV/g (range ± 2g) cosinusoidal, between 70–110° approx. linear, linearity: ± 0.2% |
A/D converter (National Instruments, modified by Biovision, Wehrheim, Germany) | 14-bit, range: -5 to 5 V |
Motor for throttle valve control (RS Components GmbH, Frankfurt/Main, Germany) | Trident DC Geared Motor (12 V dc / 13.9 W, 0.75 Nm, 360 – 1020 rpm) |