The dependences analysis between the non-conformities level (PN) and downtime (TP), breakdown time (TA), coefficient of operation (WE), coefficient of speed (WPD), coefficient of useful operating time (UCD) and coefficient of utilization (WW) are shown in Table 4.
The impacts of individual factors of TPM: breakdown time (TA), downtime (TP), coefficient of operation (WE), coefficient of utilization (WW), the coefficient of speed (WPD), the useful operating time, time of accident forms (TAF) and the time machine failure (TAM) on the level of quality (BS represented as the level of non-conformity) are presented in the form of the correlation graph (Fig. 3).
On the basis of machine working time, taking into account failures and other outages, the analysis for TPM coefficients was calculated: coefficient of operation (WE), coefficient of the speed (WPD), coefficient of utilization (WW) and coefficient of useful operating time (UCD), calculated according to formulas (1), (2), (3), and (4) (Borkowski and Selejdak 2007; Jostes and Helms 1994).
The analysis of Fig. 3 shows that for both analyzed machines there are: significant positive correlations between the downtime (TP), breakdown time (TA), forms breakdown (TAF) and the non-conformity level (PN), significant negative correlation between the coefficient of operation (WE), coefficient of speed (DPN), coefficient of utilization (WW) and the level of castings non-conformities (PN).
significant positive correlations between the downtime (TP), breakdown time (TA), forms breakdown (TAF) and the non-conformity level (PN), significant negative correlation between the coefficient of operation (WE), coefficient of speed (DPN), coefficient of utilization (WW) and the level of castings non-conformities (PN).
Operation wise, the GHE achieves higher performance and Coefficient of Performance (COP) under intermittent operation mode than under continuous operation mode.
While taking into account the extra heat needed for the MFG operation, the total coefficient of performance (COPt) is 0.185.
During time intervals of transitory operation the traditional coefficient of performance may be used as a substitute of the time averaged value of the instantaneous coefficient of performance.
Both operations accompany a reduction in the coefficient of performance compared to the design value, but variable speed operation exhibits much less reduction at the same refrigeration capacity.
We observed a statistically significant inverse correlation between the occurrence of misplacement and the patient number i.e. the date of operation (correlation coefficient of –0.35; p < 0.001).
The main design characteristics and operational parameters such as ring speed ratio, eccentricities, and friction coefficient are presented for various cases of operation under the exact analytical solution and they are compared with approximating or numerical bearing models and experimental measurements when possible.
