A vehicle has a double wishbone front suspension and a beam rear axle. The vehicle roll angle and the front wheel camber angle are related by the relationship front wheel camber angle vehicle roll angle y = In this instance, y is equal to 0.5. The cornering stiffness for each tyre on the vehicle is 2.5kN/degree and the camber stiffness for each tyre is 169N/degree of camber angle. During steady state cornering both front and rear slip angles are equal to 2.6 degrees, the body roll angle is 5 degrees. Calculate the total cornering force in Newtons produced by the front axle.

1. A building exhaust fan for a large commercial bullding weighs 180 pounds and operates at a speed of 600 rpm. Due to manufacturing tolerances, it may have a rotating imbalance. It is desired to limit force transmissibility to 2.5 as the fan passes through resonance during startup and wind-down. In addition, an Isolation of 90% is required at the operating speed of the fan. The fan's framework will be supported from the floor at 4 corners. Design, select, and specify vibration isolators at the four corners. It is acceptable to assume the center of gravity is symmetrical with respect to all four corners, enabling you to treat this as a single DOF system without pitch or yaw.

Biomechanies Il

Damped System What type of damping do you want for your car suspension? (A) Under damped (B) Critically damped (C) Over damped (D) Suspension systems are useless

Optimisation of the dampening to be 90%-95% after 5 cycle.

A mass-spring damper system has the following parameters: • mass 250g damping constant 1/36000 Nh/m • spring stiffness 500 N/m Calculate the damped frequency. O 1.55.2 rad/s O 2.25.8 rad/s O 3. Not possible to calculate. O 4.79.4 rad/s O 5.44.7 rad/s

Free Vibration Acceleration Time History 0.5 1,-0.424 sec Accel, 0.423 g 0.4 0.3 t4.958 sec Accel0.194 g 02 0.1 -0.1- -0.2 -0.3 -0.4- -0.5 Time (sec) Calculate the natural frequency of the structure from the experimental testing results shown below which were obtained from a free vibration test of the SDOF structure. Acceleration (

##L2Q8 A car has the following specifications m = 1599.8kg, l = 2669.6mm, w = 1539.3mm. Assuming a1 = a2, h = 760mm, m = 0.75, get the optimal tractive force Fx1/Fx2, which reaches the optimal maximum acceleration.