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1. (WO2017033015) THE MEASUREMENT AND USE OF HYDRAULIC STIFFNESS PROPERTIES OF HYDRAULIC APPARATUS

Pub. No.:    WO/2017/033015    International Application No.:    PCT/GB2016/052635
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Thu Aug 25 01:59:59 CEST 2016
IPC: F04B 51/00
F15B 19/00
F04B 49/06
F04B 49/08
Applicants: ARTEMIS INTELLIGENT POWER LIMITED
Inventors: STEIN, Uwe Bernhard Pascal
CALDWELL, Niall James
Title: THE MEASUREMENT AND USE OF HYDRAULIC STIFFNESS PROPERTIES OF HYDRAULIC APPARATUS
Abstract:
A method of operating a hydraulic apparatus comprising a hydraulic circuit region and hydraulic machine which is controlled to displace pulses of fluid of known volume into or out of the hydraulic circuit region, generating pulses of pressure in the hydraulic circuit region and torque in the hydraulic machine shaft. The response of parts of the hydraulic apparatus to these pulses is measured and used to determine properties of the hydraulic apparatus. The response of the pressure in the hydraulic circuit region to pulses at different pressures can be used to measure the hydraulic stiffness of parts of the hydraulic circuit region. It is possible to detect faults and to make measurements useful in subsequent operation of the hydraulic apparatus.