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Why
HydroPneumatic
Suspension?
Author: Eng. Leandro O. Santos
linkedIN: leandro-oliveira-santos-82974813/
Why HydroPneumatic Suspension?
Main Advantages
▪ For heavy load applications
▪ >12 ton axles
▪ Big Load Ratio
▪ Load and unload vehicles
▪ Independent leveling control
▪ Great roll stabilization
Suspension types Comparison
 For more stable Suspension Force and Spring Rate
Natural Frequency of the suspensions
 From 1 to 100 Hz they are sensed to be accelerations and displacements, in the frequency range of 20 Hz–10 kHz
they are perceived acoustically (noise).
 Reimpell points out that the range from 1 to 4 Hz determines the subjective estimation of the “suspension
comfort” while the range from 4 to 80 Hz influences what is called “harshness” [REI05] – low amplitude and short term
accelerations resulting for example from rides over cobblestone paving.
 ISO2631-1 indicates that excitations in the frequency range from 0.1 to 0.5 Hz are responsible for motion sickness.
Better control for Suspension Frenquency
Comparison & Advantages
When Hydropneumatic Suspensions are
necessary?
 (a) a level control is needed in particular for level readjustments after major load changes,
 (b) a level control needs to work frequently and needs to react quickly,
 (c) a manual operator control for the suspension level is desired,
 (d) little space is available for suspension elements,
 (e) possibly hydraulic cylinders are already available for control of the desired suspension degree of freedom,
 (f) robust components are required due to the harsh working environment,
 (g) a lockout of the suspension in the design position is required,
 (h) the spring rate needs to be adjustable,
 (i) a hydraulic energy supply is already available.
Points a, b, f and i are the reasons why hydro-
pneumatic suspension systems can be found in all
kinds of off-road vehicles

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Why hydro-pneumatic suspension

  • 1. Why HydroPneumatic Suspension? Author: Eng. Leandro O. Santos linkedIN: leandro-oliveira-santos-82974813/
  • 2. Why HydroPneumatic Suspension? Main Advantages ▪ For heavy load applications ▪ >12 ton axles ▪ Big Load Ratio ▪ Load and unload vehicles ▪ Independent leveling control ▪ Great roll stabilization
  • 3. Suspension types Comparison  For more stable Suspension Force and Spring Rate
  • 4. Natural Frequency of the suspensions  From 1 to 100 Hz they are sensed to be accelerations and displacements, in the frequency range of 20 Hz–10 kHz they are perceived acoustically (noise).  Reimpell points out that the range from 1 to 4 Hz determines the subjective estimation of the “suspension comfort” while the range from 4 to 80 Hz influences what is called “harshness” [REI05] – low amplitude and short term accelerations resulting for example from rides over cobblestone paving.  ISO2631-1 indicates that excitations in the frequency range from 0.1 to 0.5 Hz are responsible for motion sickness. Better control for Suspension Frenquency
  • 6. When Hydropneumatic Suspensions are necessary?  (a) a level control is needed in particular for level readjustments after major load changes,  (b) a level control needs to work frequently and needs to react quickly,  (c) a manual operator control for the suspension level is desired,  (d) little space is available for suspension elements,  (e) possibly hydraulic cylinders are already available for control of the desired suspension degree of freedom,  (f) robust components are required due to the harsh working environment,  (g) a lockout of the suspension in the design position is required,  (h) the spring rate needs to be adjustable,  (i) a hydraulic energy supply is already available. Points a, b, f and i are the reasons why hydro- pneumatic suspension systems can be found in all kinds of off-road vehicles