Download Hydropneumatic Suspension Systems by Wolfgang Bauer PDF
By Wolfgang Bauer
Hydropneumatic suspensions structures mix the superb houses of fuel springs with the beneficial damping houses of hydraulic fluids. the benefits of those platforms are really applicable for car functions, akin to passenger automobiles, vehicles and agricultural gear. during this e-book, Dr. Bauer offers an in depth evaluate of hydropneumatic suspension platforms. beginning with a comparability of other varieties of suspension platforms, the writer consequently describes the theoretical historical past linked to spring and damping features of hydropneumatic structures and additionally explains the layout of an important process parts. also he provides an outline of point keep an eye on platforms and diverse distinct services. eventually the know-how is illustrated by way of layout examples and the outlook for destiny hydropneumatic suspensions is discussed.
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2. g. caused by flow restrictors). The focus here is purely on spring characteristics. 3 Non-preloaded Hydropneumatic Suspensions This is the simplest type of hydropneumatic suspension. This system consists of a single acting suspension cylinder and an accumulator. The suspension cylinder 26 2 Hydropneumatic Suspension Systems FF FF s=0 s=0 Fhydr. (a) Plunger cylinder s Fhydr. s (b) Double-acting cylinder with interconnected cylinder sides Fig. 5 Schematic illustration of non preloaded hydropneumatic suspensions can be designed as a single-acting cylinder (for example, a plunger cylinder) or as a double-acting cylinder with interconnected pistonside and rodside of the cylinder.
The higher the amount of energy stored in the suspension system, the larger the amplitude of the oscillation. Due to the increased displacement, the energy drawn out of the system by friction during each oscillation increases with the stored energy. This means that a damper, which works by the principle of boundary friction, is at least partially self adapting to the needs of the system. It will be shown in Sect. 2 that fluid friction is even more capable of providing this important feature. The first dampers which were used in suspension systems were based purely on the principle of boundary friction.
When looking at Eq. 37) it is easy to discover that it is possible to vary the preload and therefore the spring rate by changing a rather easily adjustable parameter: the preload pressure pV . This possibility to influence the spring characteristics allows the control of the suspension depending on other parameters such as the static spring load or other operation parameters in an open loop or even in a closed loop. A good example of the spring load dependent preload pressure control is the John Deere front axle suspension TLS II, which comprises a two-step adjustment of the spring rate level depending on the static spring load.