| 摘要 |
A method of determining a duration of a movement of a starter air valve of a turbine engine, the valve for regulating the passage of a flow of pressurised air from upstream to the downstream of pipework, where the downstream side is connected to a pneumatic starter of the turbine engine, the method including determining an instant of initiation and an instant of completion of a movement of the valve during a movement phase of the valve, determining the duration of the movement of the valve, by subtracting the instant of initiation from the instant of completion, calculating a difference between the determined duration of the movement and a theoretical value of the duration. |
| 主权项 |
1. A method of determining the duration of a movement of a starter air valve of a turbine engine, the valve being configured to regulate the passage of a flow of pressurised air from upstream to the downstream of a pipework, where the downstream side of the pipework is connected to a pneumatic starter of the turbine engine, the method comprising:
determining an instant of initiation and an instant of completion of a movement of the valve during a movement phase of the valve, determining the duration of the movement of the valve, by subtracting the instant of initiation from the instant of completion, calculating a difference between the determined duration of the movement and a theoretical value of the duration,wherein the instant of initiation and the instant of the completion are each determined by a method which comprises:
periodically measuring a pressure within the upstream side of the pipework, during a movement phase of the valve, obtaining a characteristic quantity of the change in pressure as a function of time, determining a representative instant at which characteristic quantity shows a variation representative of an initiation or of a completion of a movement of the valve, determining the instant of initiation or the instant of completion as being the representative instant. |
