说明采用七自由度单元的有限元法进行矩形截面简支梁的弯翘分析，有很高的精度，可以代替繁琐的解析解。
The result shows seven-freedom unit finite element method has high precision to analyse simple beam of rectangular section, it can replace complex analytic solution.
由于使用格林函数法求局部解析解，提高了计算精度。
Because of the use of Green - function method to solve local analytic solution, its accuracy is increased.
针对机构模型建立了约束方程，利用解析法求解机构的位置正反解，并绘制出机构装配简图。
Constraint equation was established according to mechanical model, utilizing the analysis, solving the forward and inverse position solution, and drawing the mechanical assembling sketch.
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