Performance of two-lobe hole-entry hybrid journal bearing system under the combined influence of textured surface and couple stress lubricant

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Table 3

Percentage change in the dimensional value of selected performance characteristic parameters of two-lobe hole-entry hybrid journal bearing.

BPC	Circular non-textured bearing			Circular textured bearing			Two-lobe non-textured bearing			Two-lobe textured bearing


(mm)	0.040421	0.041134	0.04260	0.039322	0.040145	0.041731	0.04153	0.042228	0.043629	0.040436	0.041224	0.04271
% Change	+0.000	+1.764	+5.390	−2.720	−0.683	+3.241	+2.745	+4.471	+7.936	+0.037	+1.987	+5.663
(mm³∙s⁻¹)	2.912892	2.748947	2.372104	3.891303	3.746742	3.397826	2.750261	2.57876	2.192061	3.745099	3.589697	3.221068
% Change	+0.000	−5.628	−18.565	+33.589	+28.626	+16.648	−5.583	−11.471	−24.746	+28.570	+23.235	+10.580
(MN∙mm⁻¹)	0.642104	0.649065	0.666735	1.229055	1.345383	1.588615	0.691053	0.704975	0.716265	1.333916	1.46604	1.727611
% Change	+0.000	+1.084	+3.836	+91.411	+109.527	+147.408	+7.623	+9.792	+11.550	+107.741	+128.318	+169.055
(MN∙mm⁻¹)	0.945441	0.991847	1.049766	1.313747	1.436367	1.68589	0.979799	1.027633	1.084035	1.386257	1.518604	1.785931
% Change	+0.000	+4.908	+11.035	+38.956	+51.926	+78.318	+3.634	+8.694	+14.659	+46.625	+60.624	+88.899
(MN∙s∙m⁻¹)	22.86862	24.74592	29.70301	17.64018	18.87353	22.07588	25.18567	27.45465	33.46766	19.16141	20.6022	24.3256
% Change	+0.000	+8.209	+29.885	−22.863	−17.470	−3.467	+10.132	+20.054	+46.348	−16.211	−9.911	+6.371
(MN∙s m⁻¹)	21.72118	23.50541	28.29138	17.10532	18.34702	21.56624	22.86283	24.81188	30.04237	17.99283	19.3472	22.84612
% Change	+0.000	+8.214	+30.248	−21.251	−15.534	−0.713	+5.256	+14.229	+38.309	−17.165	−10.929	+5.179
(rad∙s⁻¹)	1046.889	1063.952	1079.292	1246.745	1297.67	1399.079	1053.078	1068.019	1077.524	1286.619	1340.904	1446.203
% Change	+0.000	+1.630	+3.095	+19.090	+23.955	+33.642	+0.591	+2.018	+2.926	+22.899	+28.085	+38.143
(MN∙mm)	0.014538	0.014488	0.014398	0.013693	0.013665	0.013641	0.015019	0.014971	0.014888	0.014132	0.01411	0.014102
% Change	+0.000	−0.343	−0.964	−5.810	−6.003	−6.169	+3.307	+2.981	+2.412	−2.792	−2.944	−2.994

BPC, bearing performance characteristics; Newtonian lubricant ; couple stress lubricant .

% Change = (BPC − BPC|_{Base bearing}) × 100/BPC|_{Base bearing}.

Base bearing: circular non-textured journal bearing operating with Newtonian lubricant.

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