Dynamic analysis of hydraulic control unit

The Hydraulic Control Units (HCU) are required to operate when the required response spectra (RRS) corresponding to dynamic loads of upset and faulted conditions are applied to the HCU's. To demonstrate operability, they are qualified to testing response spectra (TRS). This paper presents a procedure by which the RRS and TRS were generated at the upper HCU connecting locations and also the selected locations. A comparison of the RRS and TRS shows that the RRS are indeed enveloped by the TRS at the mounting locations as well as at the floor. Thus, the use of the HCU test results to qualify the HCU in the actual installation is justified. (orig.)