针对产品并行设计过程特点，提出一种分层递阶(三层七阶段)的产品可制造性评价策略。

A hierarchy evaluation method of three levels and seven stages of product manufacturability is presented based on the process of product concurrent design.

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得到的结论是：对于叶片的前七阶振动，通常的叶片固支状态对叶片自振频率计算值几乎没有影响。

The conclusion shows that the calculated results of blade intrinsic vibration frequencies bear no relation to the common fix states for the first seven-order blade vibration.

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在此基础上，对车架的动态特性进行了分析，得到EQ 6590ks1车架在动态特性下的前七阶固有频率和相应的谐响应特性。

Based on this, dynamic property of EQ6590KS1 coach body frame was studied, the seven native frequency and its harmonic response property are gained.

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