The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 1988
Filed:
Jan. 14, 1987
Robert B Kruse, Huntsville, AL (US);
Benjamin B Stokes, Huntsville, AL (US);
Robert L Glick, Dayton, OH (US);
Kenneth E Junior, Madison, AL (US);
Morton Thiokol, Inc., Chicago, IL (US);
Abstract
In solid propellant rocket motors the size of the flowfield defined by the bore continually increases as the solid propellant is consumed. As a result, the efficacy of a rigid baffle decreases through the burn. By making the baffle flexible, it can be deformed to fit the small initial geometry and its expansion due to inherent resilience naturally accommodates the enlarging geometry of the propellant bore. Since the baffle is flexible, it can participate in the oscillations and thereby alter frequency and mode structure and also introduce nonlinear behavior. Thus, pressure waves propagating in one direction around the propellant bore lift a flap of the baffle and pass through the clearance. Pressure waves propagating in the other direction around the bore, however, press the flap against the surface of the bore to restrict the passage of such waves. As a result, the flexible baffle acts as a 'check valve' to limit wave motion. Anisotropic characteristics can be imparted to the baffle by incorporating stiffeners.