Reporttufan - PART 1. DETERMINATION OF CENTER OF GRAVITY...

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PART 1. DETERMINATION OF CENTER OF GRAVITY LOCATION Instruments: A simple crane, a frame to lift the axle of the test vehicle, a load cell connected between the frame and the crane, amplifier (bridge), voltmeter, and a straight ruler. Mathematical observation of the measurement is as follows : Using known front and rear axle loads, location of the center of gravity along the longitudinal axis (l 1 and l 2 ) can be easily calculated. 1
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Procedure: 1) Properly inflate all tires on the test vehicle. To eliminate tire springing during the measurement, it is recommended that the tire pressure on both axles be increased to 3,0 to 3,5 bar. 2) In order to eliminate the springing effect. Both axles must be prevented from compressing or rebounding before the vehicle is raised. A locking device must be used to adjust the amount of compression in the suspension springs when the vehicle is loaded. (Welding an old set of shock absorbers is an easy solution) 3) Measure and record the tire static radius (both front and rear). 4) Measure and record the front and rear tire track width. 5) Measure and record the wheel base length. 6) Record the vehicle fuel load and other weight variables. Any load that could shift must be secured; fuel tank should be empty or full. The vehicle should be in on-road condition, i.e. tools, spare wheel etc. 7) Place the load sensor between the frame and the crane and calibrate the load sensor for normal load. 8) Lift the frame and balance the amplifier when only the frame's load acting on the sensor. 9) Place the front axle of the test vehicle on the frame. 10) Lift the front end of the vehicle "just enough" to separate the contact between the tires and the ground. Record the front axle load. The rear wheels must be rolling freely. Brakes must be released and gear box must be in neutral. 11) Lift the front axle of the vehicle using the crane (30-50 cm recommended). Record the new front
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Reporttufan - PART 1. DETERMINATION OF CENTER OF GRAVITY...

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