Povećanje performansi dvotaktnog Otto motora optimiranjem detonacijskog izgaranja

All high-efficiency engines are inclined to destruction tendencies resulting from detonation combustion. Most often the producers of engines solve this problem with limitation of maximum output performance but, in this, there is an efficiency decrease of fuel utilization. However, detonation combustion can also be useful because if it is kept to a certain level, then detonation combustion helps considerably in an additional increase of output performance. This article defines the termination expressed in a number of detonation units per overridden distance of track carried out by a single-track vehicle. Just for this limit, there is a detonation combustion beneficial to increase an output performance and not cause destruction in the engineering parts of an engine. The limit gives an idea about the influence of individual factors on detonation combustion as well as the influence on this combustion in obtaining maximum values and behaviours of engine output performance and torque with dependence on engine speed.Svi visoko učinski motori naginju detonacijskom načinu izgaranja. Mnogi proizvođači motora rješavaju taj problem ograničavanjem maksiomalnih izlaznih performansi motora, a što ima za posljedicu smanjenje stupnja iskoristivosti tog motora. No ipak detonacijsko izgaranje može biti i od koristi, jer ako se ono podržava na stvarnoj razini, tada takav način izgaranja omogućava primjetno povećavanje izlaznih performansi motora. Ovaj članak definira ograničenje broja detonacijskih jedinica nad cjelokupnim putanjom, koje je prešlo vozilo. Upravo za to ograničenje postoji benefit detonacijskog izgaranja u smislu povećavanja izlaznih performansi, a pri čemu ne dolazi do oštećivanja bilo kojeg drigog dijela motora. To ograničenje daje ideju o utjecaju pojedinačnih faktora na detonacijsko izgaranje, kao i utjecaj ovakvog načina izgaranja na dobivanje maksimalnih vrijednosti kao i na ponašanja izlaznih performansi motora i momenta ovisno o brzini motora

ANALYSIS AND OPTIMISATION OF DYNAMIC STABILITY OF MOBILE WORKING MACHINES

This paper describes an investigation of the dynamic stability, which is specified for the mobile working machines. There are presented the basic theoretical principles of the stability theory together with an introduction of two illustrative examples of the dynamic stability analysis

IDENTIFICATION OF TECHNICAL STATE AND OPTIMISATION OF OPERATION OF TRANSPORT-HANDLING EQUIPMENT

This paper describes a real example from the practice concerning an analysis of technical state and operational optimisation of the given transport-handling equipment, which is installed in a trans-shipment station specified for transport and handling of bulk materials. By means of identification of a faulty technical state of this transport equipment there was determined the main cause of a damage process, which occurred during current operation. Consequently, it was possible to perform an optimisation of the relevant technical parameters in order to eliminate the negative phenomena

INCREASING DURABILITY IN STEEL WIRE ROPE INSTALLED IN SPECIAL TRANSPORT EQUIPMENT

In this paper, special transport-handling equipment is presented for the purpose of pushing wagons in a trans-shipment facility. During operations, the rotary tilter device, which is an integrated part of the trans-shipment process, leads to excessive wear of the steel wire rope used for pushing wagons by means of a pusher system. Therefore, the main task was to propose a suitable design modification of the given pusher system in order to eliminate excessive wear of the rope and, in turn, to prolong operational durability for this steel wire rope, as well as for the whole technical system