Knowledge-Based Structure Optimization Design for Boom of Excavator

Table 7

Comparison of initial shape, tuning results, and optimization results.

Shape	Condition	σI/MPa	σII/MPa	σIII/MPa	σIV/MPa	σV/MPa	σVI/MPa	σm/MPa	V (X)/mm^3	Category
Initial shape	1	88.337	79.889	87.883	105.710	78.304	165.383	165.383	1.66 × 10^8	001
	2	76.166	67.274	78.237	95.681	71.292	179.910	179.910
	3	92.538	93.894	96.410	119.224	76.112	242.969	242.969
	4	90.572	80.348	87.305	99.560	76.341	144.800	144.800
Tuning result	1	118.430	118.584	105.740	134.431	89.628	164.711	164.711	1.45 × 10^8	001
	2	101.995	103.784	89.881	113.973	87.719	179.463	179.463
	3	140.735	142.966	111.769	141.175	88.438	241.937	241.937
	4	118.933	118.798	105.394	126.352	89.353	144.416	144.416
Optimization result	1	223.994	188.055	208.388	101.637	79.379	164.034	223.994	1.31 × 10^8	004
	2	155.187	131.994	151.772	79.392	57.383	180.619	180.619
	3	196.277	183.923	190.165	98.673	59.494	241.798	241.798
	4	230.455	189.482	214.046	95.376	78.003	144.707	230.455