(Solved): Question 4 (20%) A cantilever beam is to be used as a load cell. The beam, made of 2024-T4 aluminu ...

Question 4 (20%) A cantilever beam is to be used as a load cell. The beam, made of 2024-T4 aluminum having a modulus of 71 Gpa, is 21cm long, 0.4cm thick, and 2cm wide. The load of between 0 and 200 g is to be applied along the beam centerline 20cm from its fixed end. Strain gauges are to be used to measure beam deflection and mounted to a full Wheatstone bridge to provide an electrical signal that is proportional to load. Design the sensor arrangement and its location on the beam. Specify appropriate signal conditioning to excite the bridge and to measure its output on a data acquisition system using a ±5V A/D converter. Can the system achieve a 4% uncertainty at the design stage? The following specifications and system choices are stated: a. one, two or four axial gauges at 120 +0.2% (selectable) b. Gauge factor of 2.0±1% c. Bridge excitation: 5V ±0.5% d. Bridge null: within 5mV Signal conditioning: 1. Amplifier gain: 100X ±1% 2. Low-pass filter: fe at 50Hz @ -12dB/octave h