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Assessment of the modernized production system through selected TPM method indicators

Michlowicz Edward

Eksploatacja i Niezawodność

2022

Vol. 24, no. 4

677--686

The subject of the studies is the evaluation of the operation of a production system after modernization. The analysed case concerns the modernization forced by the end of the product lifetime. The proposed methodology is that of a multicriterial evaluation of the system operation after modernization. The evaluation criteria are selected TPM indices: availability of machinery and equipment, production process capacity, product quality and overall equipment effectiveness (OEE). The additional criteria are reliability indices MTBF and MTTR of studied production lines and the MTTR of the most unreliable equipment in each analysed line. A yearly monitoring of production process was proposed for obtaining the statistical credibility of the evaluation results. Additionally, a fuzzy indicator of acceptability of the modernization assessment was proposed. The paper presents the results of studies of the system for production of zinc concentrate from post-production waste. The obtained values of OEE, MTBF and MTTR indicators for the three tested lines make it possible to state that the modernization carried out is acceptable.

Study of diesel fuel feed system with divided processes of forcing and dosing out

Slavutskiy V., Salykin E., Belozubov Y., Kanygin Z.

Journal of KONES

2009

Vol. 16, No. 1

459-464

A fuel delivery method that patented by authors realised by numerical and natural experiments. The traditional system is added a lock organ before an injector. The injector cavity is connected with the force main only for the time of injecting fuel. After a valve closing the injector cavity is connected with the cavity of low pressure. When cutting off at the end of the working plunger stroke the force main is discharging. In a delivery high-pressure the accumulation of energy flow takes place, it increases speed growing of pressure in the injection beginning. The valve closing is accompanied by fast pressure decrease in the end of injection process. Such feeder of fuel allows dividing forcing and dosing out processes. It improves, in comparison with traditional, both adaptive and power properties of system. Numerical experiments confirm working capacity of the modernised fuel feed system. Defined influence of its basic constructive and adjusting parameters on indicators of process of fuel delivery is presented. The offered system allows a flexible adjustment of the cycle fuel feed when changing a high speed regime as well as providing for a set speed Diesel characteristic and a versatile regulation if the cycle feed at Diesel start. The numerical experiments confirm the efficiency of the experimental system of fuel feed.