Analytical methods with application to the Pathfinder 1 model
Thermal and stress analyses, elastic math models, verification testing, deformation and aeroelastic analyses, and integrated computer programs are addressed.
Hunter, W. F.↗
Engineering topics
Hunter, W. F.
Publications and source records attributed to Hunter, W. F..
A computerized method for calculating flutter characteristics of a system characterized by two degrees of freedom
A formulation is given for calculating flutter frequency and flutter speed for a problem with two degrees of freedom. Two different solutions for evaluating the flutter determinant are presented and the results for each method are compared. A program flow diagram, partial program listing, and a sample problem with input and output for the two different methods are included. Although the method was developed for computing flutter characteristics of a pylon installed in the NASA Langley VSTOL tunnel, it is sufficiently general to solve any flutter system that can be characterized by two degrees of freedom.
Stalnaker, W. A.↗
Arbitrarily Curved and Twisted Space Beams
A derivation of the equations which govern the deformation of an arbitrarily curved and twisted space beam is presented. These equations differ from those of the classical theory in that (1) extensional effects are included; (2) the strain-displacement relations are derived; and (3) the expressions for the stress resultants are developed from the strain displacement relations. It is shown that the torsional stress resultant obtained by the classical approach is basically incorrect except when the cross-section is circular. The governing equations are given in the form of first-order differential equations. A numerical algorithm is given for obtaining the natural vibration characteristics and example problems are presented.
Hunter, W. F.↗
Determination of gas volume trapped in a closed fluid system
Technique involves extracting known volume of fluid and measuring system before and after extraction, volume of entrapped gas is then computed. Formula derived from ideal gas laws is basis of this method. Technique is applicable to thermodynamic cycles and hydraulic systems.
Hunter, W. F.↗
Integrating-matrix method for determining the natural vibration characteristics of propeller blades
Integrating matrix method for determining natural lateral vibration data on rotating twisted propeller blade
Hunter, W. F.↗