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What is the meaning of suspended mass and non-suspended mass?

Front and rear air spring shock strut for Cadillac Escalade Chevrolet Tahoe Suburban GMC Sierra 1500 Yukon XL

The non-spring mass is the part of the vehicle whose weight is borne by the springs, and the non-spring mass is defined as the mass between the road and the springs. Stiffness of the springs has a great impact on how a car works. For example, passenger cars and luxury cars (such as the BMW 3 Series) do not have strong suspension, which allows them to pass through bumps smoothly, but they tend to fall asleep and get up during braking and acceleration, as well as in sharp turns. Their bodies are clearly visible. Sports and racing cars, on the other hand, have stiff suspension that is not suitable for passing bumps, but instead, you can cross corners more quickly and safely.

Shock absorbers
The springs normally open and close at their natural frequency until all the energy stored in them is drained. If you do not want to jump up and down in your car for a long time and lose control, it is better to use the shock absorber system. The shock absorber system uses a shock absorber that converts the kinetic energy from the suspension into heat energy and dissipates it through a hydraulic fluid. This prevents extra vibration and movement of the car.

air spring shock core for Audi A6 C5 4B 01 05 Allroad Quattro

The shock absorber is actually an oil pump that is placed between the chassis frame and the wheels. When the car wheel passes over a pedal, the energy from the opening and closing of the spring is transferred to the fan, causing the piston to go up and down. The oil inside the shock absorber chamber is drained by moving the piston through small holes. The small size of these holes allows the piston to move slightly even at high pressures, which slows down the piston and thus slows down the movement of the springs. In this way, the movement of the springs can be controlled.

All modern cars have speed sensors; That is, the higher the speed of the springs, the higher the resistance of the shock absorber. This allows the performance of the assistant to be in line with road conditions and to prevent additional movements such as jumping up and down and deviating.