Author: Gavin D. Jenney Publisher: ISBN: Category : Languages : en Pages : 202
Book Description
This report presents the results of the following three research and development activities: the design, fabrication and test of a multi-channel flight control system hybrid simulator; the analysis and application of a flutter damping technique for hydraulically actuated slab type control surfaces; and the experimental testing of Mil-H-83282 hydraulic fluid in a pumping system at elevated temperature.
Author: Gavin D. Jenney Publisher: ISBN: Category : Languages : en Pages : 211
Book Description
This report describes the development of a flutter suppression actuator technique and the wind tunnel evaluation of that technique. The report also describes the flightworthiness testing of a direct drive Fly-By-Wire flight control system applied to the aileron axis of an F-4 aircraft. Also included is an evaluation of an angular rate sensing augmentation actuator supplied to the Air Force for evaluation. Presented in the material are the test results of all three experimental evaluations. Further testing of the flutter suppression is recommended to clarify an anomoly in the results of the testing. The direct drive control system passed its environmental testing used to establish flight worthiness. The rate sensing actuator operated as designed.
Author: Publisher: ISBN: Category : Languages : en Pages : 178
Book Description
This report describes the design and test of a multipurpose actuation test rig to be used for loaded evaluation of actuation systems with rotary outputs and/or integrated as part of wing structure. It also describes a hydromechanical flutter damping module for an F-4 stabilator actuator. The module incorporates design improvements based on previous test results. Laboratory tests results on the improved module are presented. Development and test results of a linear force motor based upon a moving magnet concept, and the measured performance characteristics of the concept over a range of parameter variations are presented. A method of force enhancement for direct drive force motors and the corresponding test results applied to a moving coil force motor are described. The concept is based upon applying a limited time duration pulse to the force motor in order to increase the force output when required. The logic technique used to initiate the pulse application is presented. Applying a digital computer as a controller for an analog electrohydraulic control system requires consideration of the interface used. The effect of a pulse width modulation interface on the life of analog electrohydraulic hardware is presented. There is a potential for reducing the pumping capacity of an aircraft's flight control hydraulic system by using accumulators to store hydraulic energy. The results of a study using this approach and an F-16 simulation are presented. Keywords: Digital interface; Energy storage; Flight control hydraulics; Force enhancement, Flutter suppression.
Author: Howard H. Belmont Publisher: ISBN: Category : Actuators Languages : en Pages : 164
Book Description
This report describes a study of flight control actuation system with an objective to determine the degree of digitalization possible between the digital flight control processor and the control surface. A typical analog actuation system is defined as a reference for comparison with five alternates, each mechanized with increasing amounts of digital equipment. The report provides a basis for determining the direction of digital actuation systems. It verifies that distributed actuation systems are now feasible and promise enhanced performance, reliability, and cost reductions.
Author: Gavin D. Jenney
Author: 
Author: 
Author: Gavin D. Jenney
Author: 
Author: 
Author: 
Author: David L. Grose
Author: Howard H. Belmont
Author: