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 Steering Test Systems Whether interest is in fatigue or development tests for steering sub-systems, BIA provides the most adapted installation to designers or steering components manufacturers. Since most steering systems use electric or hydraulic power system, full communication under CAN protocol is available. In addition, BIA also offers a real turnkey solution by providing a climatic module. STEERING COLUMN CHARACTERIZATION To characterize steering column, an electric actuator is used to simulate steering wheel actions. On the output side, several modules had been developed to measure: • Twist rigidity by applying torque on rack side
• Friction torque (with or without load)
• Homokinetic defects by comparing input and output velocities. Performance:
Steering Wheel Torque: Up to ± 50 Nm
Steering Wheel Speed: Min. 0,1 rpm
Reaction Torque: Up to 20 Nm DYNAMIC EVALUATION BENCH Additionally, hydraulic actuators can be added in order to apply loads on steering rack and to simulate wheel loads. Many tests can then be performed. • Violent wheel swerve: acceleration up to 15 000°/s2 with 6000N resistive force on rack
• Wheel release after wheel turn: steering column behavior study after wheel releasing
• Frequential characterization (direct or reverse): system response measurement under vibrating (force/displacement)
• Derating: power electronics failure analysis Performance:
Steering Wheel Torque: Up to ± 150 Nm
Maximum Load On Rack: ± 15 kN on each side
Maximum Frequency: 50 Hz
STEERING COLUMN FATIGUE For fatigue & durability tests, steering column is adjusted in height and angle. Two hydraulic rotating actuators are positioned on wheel and rack side. They are used to drive steering column up to 150 N.m in static tests, whether in dynamic tests frequency can reach 10Hz. In addition, another linear actuator aims at oscillating on rack side, at a 10Hz frequency. Performance :
Static Tests Torque: 150 Nm
Dynamic Tests Frequency: 10 Hz
Linear Oscillation On Rack Side: 10 Hz ± 25 mm
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Vehicle Dynamics
