In recent years, with the development of the market demand for mechanical properties of engineering construction machinery, it is necessary that the boom of trucks work in large space with complex movement. This necessity will lead to the difficulty and long period of design and test in R&D process of the machinery. For example, in the boom’s modal parameter identification, it is difficult to estimate the change of the modal parameters of booms in different gestures. Usually, finite element method is employed to solve such problems, but this method is less efficient. In this paper, the Response Surface Method is introduced. The response surface model of a fire truck’s boom is established and its natural frequency of the first-order modal is obtained. A fast and efficient solution scheme for modal parameter identification of the fire-truck’s boom is proposed. The research shows that compared with the finite element method, the computational efficiency of the response surface method for predicting the modal parameters of 100 gestures of the boom is increased by nearly ten times, the relative error between the two methods is less than 2%.%近几年，随着市场对机械性能的要求愈发严苛，工程机械臂架工作空间的演变呈现出更庞大更复杂的趋势，这一趋势直接导致研发过程中试验困难且耗时长。以臂架模态参数识别工作为例，不同姿态臂架的模态参数变化难以估计，工程实际中常使用有限元法来解决此类问题，但工作效率通常较低。引入响应面法，建立某消防车臂架第一阶模态固有频率的响应面模型，获取其第1阶模态固有频率，针对多姿态下消防车臂架模态参数识别工作提出一种快速有效的解决方案。结果表明，与有限元法相比，引入响应面法对100个姿态下消防车臂架模态进行预测，在保证与有限元计算结果相对误差不超过2%的前提下，其计算速度提升近10倍。
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