The introduction of two types of power transmission

The Two Types of power transmissian
In hydraulic power transmission the apparatus (pump) used for conversion of the mechanical (or electnicaf,thermal) energy to hydraulic energy is arranged an the input of the kinernatic chain ,and the apparatus (motor) used for conversion of the hydraulic energy to mechanical energy is arranged on the output.
The theoretical design of the energy converters depends on the component of the bernouilli equation to be used far hydraulic power transmission.
In  systerms  where,  mainly,  hydrastatic  pressure  is  utilized, displacement (hydrostatic) pumps and rnvtors are used, while in those where the hydrodynamic pressure is utilized is utilized gor power transmission hydrodynamic energy converters (e.g. centrifugal pumps) are used.
The specific characteristic of the energy converters is the weight required for transmission of unit power. It can be demonstrated that the use of hydrostatic  energy converters for the iaw and medium powers, and of hydrodynamic energy converters of high power are more favorite. This is the main reason why hydrostatic energy converters are used in industrial apparatus, transformation of the  energy in hydraulic transmission.
1.   driving motor telectric, diesel engine);
2.   mechanical energy;
3.   pump;
4.   hydraulic energy;
5.   hydraulic motor;
6.   mechanical energy;
7.   Load variation of the mass per unit power in hydrostatic and hydrodynarnir energy converters
1、hydrostatic; 2.hydrodynamic
Only displacemerst energy converters are dealt with in the following. The elements performing converters provide one or several size.
Expansion of the working chambers in a purup is produced by the external energy admitted, and in  the motor by the hydraulic energy. Inflow of the fluid occurs during expansion of the working chamber, while the outflow (displacement) is realized daring contraction. Such devices are usuaiiy called displacement energy converters.
The Hydrostatic Power
In order to have a fluid of volume V1 flowiatg in a vessel at pressure work spent on compression 11V1 and transfer of the process, let us imagine a piston mechanism be connected with the aid of valves Z0 and Z1 to the external medium under pressure PQ and reservoir of pressure pl,in the upper position of the piston x=x0 with Z0 open the cylinder chamber is filled with rfluid of volume VU and pressure PD. now shut the value Zfl and start the piston moving downwards.
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