Abstract: A fan casing arrangement for a gas turbine engine, the arrangement comprising an annular casing member and a fan track liner provided radially inward of the casing member and connected thereto. A forward portion of a gas washed surface of the fan track liner is curved so as to define a concave portion of the gas washed surface (e.g. curved such that the radial position of said forward portion of the gas washed surface varies in an axial direction).

Abstract: High cycle fatigue testing is required with regard to a large number of components in order to evaluate their performance and capabilities. Typically such components are mounted such that an excitation mechanism such as through use of air jets can be utilized in order to stimulate vibration. In order to isolate a desired vibration mode generally, an isolation device is utilized. The isolation device presents an edge to a node within the component in order to inhibit vibration modes other than that of interest. Unfortunately, prior isolation elements tend to wear resulting in spurious results. By providing an isolation element within an isolation device, a fatigue test arrangement can be achieved in which both axial movement in the direction of a spring upon which the element is presented as well as lateral movement can be achieved.

Abstract: Vibration test arrangements incorporate an isolation device. In order to allow the isolation device to operate on one side only of a component subject to vibration testing a clamp association is provided between isolation elements. An abutment pressure to retain and present the component is generated between the isolation elements utilizing the clamp association and an appropriate displacement mechanism. The displacement mechanism is controlled by a controller in a control loop incorporating a sensor to determine operational characteristics of the arrangement and appropriate drivers for the displacement mechanism.

Abstract: Testing of components for fatigue under vibration conditions is important. Typically an isolation device is utilized in order to isolate a mode of vibration of interest. Isolation is through engaging a node line utilizing isolation elements. By presenting the isolation elements in arms a component can be isolated by engaging the component to one side. The isolation elements are suspended upon springs and allowed to move axially in the direction of the springs as well as laterally through mountings in the arms. The isolation elements are less acceptable to wear and test set up time is reduced by the engaging of component to one side only of the component.

Abstract: High cycle fatigue testing is required with regard to a large number of components in order to evaluate their performance and capabilities. Typically such components are mounted such that an excitation mechanism such as through use of air jets can be utilised in order to stimulate vibration. In order to isolate a desired vibration mode generally, an isolation device is utilised. The isolation device presents an edge to a node within the component in order to inhibit vibration modes other than that of interest. Unfortunately, prior isolation elements tend to wear resulting in spurious results. By providing an isolation element within an isolation device, a fatigue test arrangement can be achieved in which both axial movement in the direction of a spring upon which the element is presented as well as lateral movement can be achieved.

Abstract: Vibration test arrangements incorporate an isolation device. In order to allow the isolation device to operate on one side only of a component subject to vibration testing a clamp association is provided between isolation elements. An abutment pressure to retain and present the component is generated between the isolation elements utilising the clamp association and an appropriate displacement mechanism. The displacement mechanism is controlled by a controller in a control loop incorporating a sensor to determine operational characteristics of the arrangement and appropriate drivers for the displacement mechanism.

Abstract: Testing of components for fatigue under vibration conditions is important. Typically an isolation device is utilised in order to isolate a mode of vibration of interest. Isolation is through engaging a node line utilising isolation elements. By presenting the isolation elements in arms a component can be isolated by engaging the component to one side. The isolation elements are suspended upon springs and allowed to move axially in the direction of the springs as well as laterally through mountings in the arms. The isolation elements are less acceptable to wear and test set up time is reduced by the engaging of component to one side only of the component.