Some typical technology elements of automobile noise control are analyzed, including the simulation, the experiment, the optimization design, and the EDBMS of vehicle NVH.
对汽车噪声控制的典型技术环节进行分析，具体涉及车辆NVH性能的仿真分析、试验、优化设计以及相应的工程数据库系统。
Due to the complexity of design objects, it is necessary for the EDBMS to treat complex data structures as single entities and provide the efficient facilities for data manipulation.
由于工程应用环境中设计对象的复杂性，这就要求工程数据库管理系统能够对复杂的数据结构作为单一实体进行定义并为之提供有效的数据操纵手段。
Due to the complexity of design objects, it is necessary for the EDBMS to treat complex data structures as single entities and provide the efficient facilities for data manipulation.
由于工程应用环境中设计对象的复杂性，这就要求工程数据库管理系统能够对复杂的数据结构作为单一实体进行定义并为之提供有效的数据操纵手段。
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