公开(公告)号：US20220397504A1

公开(公告)日：2022-12-15

申请号：US17303924

申请日：2021-06-10

申请人： Hamilton Sundstrand Corporation

发明人： Gary M. McBrien ,  Frank Perrelli

IPC分类号： G01N9/32 ,  G01N9/26

摘要： A method of determining density of a fluid within a system includes actuating a piston of a hydraulic cylinder at a target velocity. Additionally, the method includes determining differential pressure and volumetric flow rate of the fluid flowing through an orifice under actuation of the piston. The density of the fluid is determined based on the first differential pressure and the volumetric flow rate of the fluid, which is used by the system to regulate a mass flow rate of fluid within the system.

公开(公告)号：US11635097B1

公开(公告)日：2023-04-25

申请号：US17724682

申请日：2022-04-20

申请人： Hamilton Sundstrand Corporation

发明人： Morgan O'Rorke ,  Frank Perrelli

IPC分类号： F15B15/14 ,  F15B15/22

摘要： Actuator systems and methods of operation are disclosed. The systems include a hydraulic actuator having a primary piston having a piston head arranged within a housing defining retract and extend chambers on opposite sides of the piston head. A control element is configured to control a supply of pressure to each of the retract and extend chambers. An actuator valve is coupled to the housing and includes a secondary piston that is biased into the retract chamber in an open flow state and when the primary piston is in a fully retracted state the piston head urges the secondary piston into a closed flow state. The actuator valve defines a flow chamber where, in an open flow state, fluid can be passed through the flow chamber and in a closed flow state the fluid is prevented from passing through the flow chamber.