By Wolfgang Bauer
Hydropneumatic suspensions platforms mix the wonderful homes of fuel springs with the beneficial damping homes of hydraulic fluids. the benefits of those platforms are quite acceptable for automobile purposes, comparable to passenger automobiles, vans and agricultural gear. during this e-book, Dr. Bauer offers an in depth evaluation of hydropneumatic suspension structures. beginning with a comparability of other varieties of suspension platforms, the writer consequently describes the theoretical heritage linked to spring and damping features of hydropneumatic structures and in addition explains the layout of crucial method parts. also he provides an outline of point regulate platforms and numerous targeted capabilities. eventually the know-how is illustrated through layout examples and the outlook for destiny hydropneumatic suspensions is discussed.
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Extra resources for Hydropneumatic Suspension Systems
Sample text
This way the boom including the bucket/pallet fork etc. and the payload is suspended softly. In particular, the pitch oscillations of the usually completely unsuspended vehicle are reduced by this means. Comfort of the driver and in most cases ride stability are increased. Furthermore the reduced vibrations and accelerations at the bucket/pallet fork ensure safe transportation of the payload. In particular, bulk goods can be carried in a bucket more safely since the suspension prevents the payload from spilling and getting lost over the bucket’s edge.
The reason is that a positive displacement s results in a compression on the pistonside (force increases) while it leads to an expansion on the rodside (force decreases). 42) While for the system with mechanical preload only two new parameters (FV and cmech ) were needed for the respective equation, the number of additional parameters for a system with hydraulic preload is much higher. These new parameters p0,R , V0,R , AR and pV are available to tune the suspension to the desired properties. Yet, in the equations, these parameters always show up in pairs as AR and pV , which represent (when multiplied) the hydraulic preload force, and p0,R and V0,R , which represent (when multiplied) the gas mass enclosed in the rodside accumulator.
It becomes obvious that it is basically possible to create similar curves with a hydropneumatic suspension system with hydraulic preload and with mechanical preload. One special feature is characteristic to both of them: at low static spring loads the natural frequency does not drop as drastically as for non preloaded systems. It stays on the desired level over a broad range of loads and even increases when the load gets close to zero. This can be ascribed to the preload force on one 46 2 Hydropneumatic Suspension Systems (a) Natural frequency [1/s] 4 3 2 FV = 3 kN FV = 5 kN FV = 7 kN FV = 9 kN 1 0 0 Natural frequency [1/s] (b) 5 10 Static spring load [N] 15 20 4 3 2 c hydr,R = 7 N/mm c hydr,R = 14 N/mm c hydr,R = 21 N/mm c hydr,R = 28 N/mm 1 0 0 5 10 15 Static spring load [kN] 20 Fig.
