ABSTRACT

A coupled hydraulic-mechanical system with a lumped parametric mechanical part has been set up, measured and mathematically modelled in the frequency domain. The main focus of this article is the identification of unknown system parameters, which depends on the models of coupling and dissipation. The set-up under investigation can be excited hydraulically, by flow rate, or mechanically, by force. The responding pressures of the hydraulic subsystem and the accelerations of the mechanical subsystem are measured, from which transfer functions between excitation and system states can be calculated. The property of reciprocity is used for the processing of measurement data. With a suitable two-step strategy and non-linear optimization unknown system parameters can be identified from measurements. Additionally, the agreement of model and measurement and the physical meaningfulness of these parameters are examined. The proposed model succeeds in predicting measured transfer functions, whose data weren't used for the identification of model parameters.

摘要

在频域中建立、测量和数学建模了一个带有集总参数机械部件的耦合液压机械系统。本文的主要重点是未知系统参数的识别，这取决于耦合和耗散模型。所研究的装置可以通过水流、流速或机械、力来激发。测量液压子系统的响应压力和机械子系统的加速度，从中可以计算激励和系统状态之间的传递函数。互易性用于测量数据的处理。通过合适的两步策略和非线性优化，可以从测量中识别未知系统参数。此外，检查模型和测量的一致性以及这些参数的物理意义。所提出的模型成功地预测了测量的传递函数，其数据没有用于模型参数的识别。