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The main requirements to which the brake system of a vehicle should respond are provision of the standard operation speed and protection features of the control pneumatic drive in case of a malfunction of any of its elements. The article describes a design of modified pneumatic brake drive having improved protection properties in case of damage of a diaphragm of any brake chambers, and methodology of parameter optimization of such drive allowing to create a layout of drive assemblies with the necessary operation speed for MAZ truck-based road trains.

One of major requirements produced to fuel flow transducers installed on mobile agricultural machines with diesel engines is minimum resistance to fuel flow passing through them in order not to exert any influence on operation of the engine. The paper gives a mathematical model of a diaphragm chamber fuel flow transducer, description thereof may be found in SAE paper No. 982048 [1]. Optimization results of the mathematical model of the transducer's design parameters are given.