Megacity理念，就是减少四座汽车的重量，将有助于提高汽车的性能和优化汽车的构造。
Reducing the weight of this four-seater car, known as the Megacity concept, will be crucial to improving its performance and range.
同轴直接式构造，效率高，体积小，重量轻，安装保养容易。6 .采用机械密封，使用寿命长。
Direct coaxial structure, high efficiency, small size, light weight, installation and maintenance easy. 6. Mechanical seal, long service life.
构造了一种以结构最低固有频率作为约束频率的结构最轻重量设计方法，并建立了相应的迭代公式和收敛准则。
A method of minimum weight design with the lowest frequency as the constraint frequency is provided, and the iterative formulas and convergence criteria are found.
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