ABSTRACT
The mechanical characteristics of the engines are adapted to the needs of the working machines by transmissions. The important scientific problem regarding the hydrostatic transmissions is the optimal implementation in complex control systems, using mathematical modeling, numerical simulation, identification, and Real-Time simulation. Three categories of hydraulic transmissions can be defined according to the types of pumps and motors used in the power loop: hydrostatic, hydrodynamic, and sonic. The design of a hydrostatic transmission can be gradually performed from the simple choice of the whole assembly, offered by the dedicated manufacturers on the basis of some preliminary data obtained from similar vehicles to a complete hydraulic, thermal, mechanical, electrical, and control computation that is passing through four different stages. The stages include design of the main components of the transmission, sizing the main components needed for specified performances, choice of the common components of the available suppliers, and optimization of the operation parameters of all the components by systematic numerical simulations.
