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Dynamic express-analysis of hydraulic systems - Typical structures of hydraulic circuits

Typical structures of hydraulic circuits and their description

The decision of the problem is based on representation of structure of the hydraulic circuit in the form of set of separate components – functional blocks of which practically any hydraulic circuit (Fig. 1) usually consists. There are: a diesel engine, pump station of open type (with an opened flow circulation), pump station of closed type (with a closed flow circulation), hydraulic actuators (hydraulic motor, two in parallel connected hydraulic motors, hydraulic cylinder, two in parallel connected hydraulic cylinders), various kinds of loading (elastic-inertial of forward or rotary action, wheel carrier), machine (block of simulation of progressive machine motion at tractive-dynamic calculations). Each of listed functional blocks is described by system of mixed differential and algebraic equations.

Fig.1. Functional blocks of hydraulic systems.

a – diesel engine with centrifugal regulator;  pump stations: b – with opened flow circulation, c – with closed flow circulation; hydraulic actuators: d – single hydraulic motor, e – two in parallel connected hydraulic motors, f – single hydraulic cylinder, g – two in parallel connected hydraulic cylinders;  elastic-inertial loading: h – of forward action, i – of rotary action; j – wheel carrier, k – machine

In a basis of the structural description of the hydraulic circuit an identification of functional blocks and representation lays, that each of them has no more than four nodes (points) in which it incorporates to other blocks of the circuit (Fig.1). The binding of nodes and identification of functional blocks are carried out as follows (tab. 1):

Table 1. Classification of functional blocks of hydraulic systems