The thing you're talking about is the sprung mass natural frequency. It is one natural frequency of a vehicle. Really just a measure of how heavily sprung a car is. High downforce open wheelers tend to migrate to very stiff setups to control to movement of the chassis (and aero elements), which in turn results in a higher natural rate.

In order to prevent surging, the spring selected should be as that its natural frequency does not resonate with any of the natural frequencies that may act upon the spring. The initial tension can be obtained using the following formula. (1) Compression Springs Na=Nt−(X1+X2) (a) When only the end of the coil is in contact with the next free coil

The first natural frequency of a helical spring is found to be, where d is the wire diameter, D is the nominal coil diameter, n t is the total number of coils, G and r are the shear modulus and density of the spring material, respectively. To calculate suspension frequency for an individual corner, you need Mass and Spring rate: f = 1/(2π)√(K/M) f = Natural frequency (Hz) K = Spring rate (N/m) M = Mass (kg) When using these formulas, it is important to take Mass as the total sprung mass for the corner being calculated. The first natural frequency of a helical spring is found to be, where d is the wire diameter, D is the nominal coil diameter, n t is the total number of coils, G and r are the shear modulus and density of the spring material, respectively. The formula for the natural frequency fn of a single-degree-of-freedom system is m k 2 1 fn S (A-28) The mass term m is simply the mass at the end of the beam. The natural frequency of the cantilever beam with the end-mass is found by substituting equation (A-27) into (A-28). mL 3 3EI 2 1 fn S (A-29)

A spring does not have a natural frequency of its own. The natural frequency of a mass spring system depends both on the stiffnes of the spring and the mass of the body supported by the spring and is f=1/(2pi)*squareroot (k/m) where k is the stiff... In order to prevent surging, the spring selected should be as that its natural frequency does not resonate with any of the natural frequencies that may act upon the spring. The initial tension can be obtained using the following formula. (1) Compression Springs Na=Nt−(X1+X2) (a) When only the end of the coil is in contact with the next free coil natural frequency can be calculated be considering the system as composed of two single mass systems where the shaft consist of two lengths l1 and l2 and their ends meet at the plane of zero motion, or node. The frequency of the two masses is the same. Since Kt = (GJ)/L, 1 1 2 I2 J G I J G n ω= = Note that at resonance, B, can become extremely large if b is small. (In the diagram at right is the natural frequency of the oscillations, , in the above analysis). In designing physical systems it is very important to identify the system's natural frequencies of vibration and provide sufficient damping in case of resonance. Natural frequency is the number of complete cycles of oscillation a mass will vibrate in a given unit of time if a force displaces it from its equilibrium position and allows it to vibrate freely. Disturbing frequency is the frequency of vibration produced by an unbalanced, rotating or reciprocating movement in mass.