Minimize	$f\left(\overrightarrow{x}\right)=0.7854x_1{x}_2^2\left(3.3333x_3^2+14.9334x_3-43.0934\right)-1.508x_1\left(x_6^2+x_7^2\right)+7.4777\left(x_6^3+x_7^3\right)+0.7854(x_4{x}_6^2+x_5{x}_7^2),$
Subject to:	$\left\{\begin{array}{c}\begin{array}{c}\begin{array}{c}{g}_1\left(\overrightarrow{x}\right)={\displaystyle \frac{27}{x_1{x}_2^2{x}_3}}-1\le 0\\ g_2\left(\overrightarrow{x}\right)={\displaystyle \frac{397.5}{x_1{x}_2^2{x}_3^2}}-1\le 0\\ g_3\left(\overrightarrow{x}\right)={\displaystyle \frac{1.93x_4^3}{x_2{x}_3{x}_6^4}}-1\le 0\end{array}\\ g_4\left(\overrightarrow{x}\right)={\displaystyle \frac{1.93x_5^3}{x_2{x}_3{x}_7^4}}-1\le 0\\ g_5\left(\overrightarrow{x}\right)={\displaystyle \frac{1}{110x_6^3}}\sqrt{{\left({\displaystyle \frac{745x_4}{x_2{x}_3}}\right)}^2+16.9\times {10}^6}-1\le 0\end{array}\\ \begin{array}{c}{g}_6\left(\overrightarrow{x}\right)={\displaystyle \frac{1}{85x_7^3}}\sqrt{{\left({\displaystyle \frac{745x_5}{x_2{x}_3}}\right)}^2+157.5\times {10}^6}-1\le 0\\ g_7\left(\overrightarrow{x}\right)={\displaystyle \frac{x_2{x}_3}{40}}-1\le 0\\ g_8\left(\overrightarrow{x}\right)={\displaystyle \frac{{5x}_2}{x_1}}-1\le 0\end{array}\\ \begin{array}{c}{g}_9\left(\overrightarrow{x}\right)={\displaystyle \frac{x_1}{12x_2}}-1\le 0\\ g_{10}\left(\overrightarrow{x}\right)={\displaystyle \frac{{1.5x}_6+1.9}{x_4}}-1\le 0\\ g_{11}\left(\overrightarrow{x}\right)={\displaystyle \frac{{1.1x}_7+1.9}{x_5}}-1\le 0\end{array}\end{array}\right.$	(29)
Variable range:	$\left\{\begin{array}{c}\begin{array}{c}2.6\le x_1\le 3.6\\ 0.7\le x_2\le 0.8\end{array}\\ \begin{array}{c}17\le x_3\le 28\\ 7.3\le x_4\le 8.3\end{array}\\ \begin{array}{c}7.3\le x_5\le 8.3\\ 2.9\le x_6\le 3.9\\ 5\le x_7\le 5.5\end{array}\end{array}\right.,$