Combustion instability is the biggest threat to reliability of liquid rocket engines, whose prediction and suppression are great significance for engineering applications. To predict stability a combustion chamber with hypergolic propellant, this work used method decoupling unsteady acoustic system. The turbulence described by Reynolds-averaged Navier–Stokes technique, interaction chemistry edd...

Multiple sets of spring, spring seat structures are uniformly arranged in circumferential short dual mass flywheel (DMF), which generally have a symmetrical structure. The internal springs and seats constrained by the shape primary secondary flywheel. At different rotational speeds, centrifugal forces. To study dynamic characteristics DMF including torque stiffness with considering influence fo...

UNLABELLED We describe a technique to rescue the continuous curvilinear capsulorhexis (CCC) in cases in which complete radial tears make it impossible to use normal traction forceps. A circumferential path and rapid movement are applied in the plane of the anterior capsule in the direction of the center pupil. This technique was used in 50 cases. In 47, the CCC could be completed; in 3, it coul...

We find closed-form solutions for axisymmetric plane strain radial deformations of a functionally graded circular hollow cylinder and radial expansion/contraction of a hollow sphere loaded on inner and outer surfaces by uniform hydrostatic pressures. The cylinder and the sphere are presumed to be made of isotropic and incompressible linear elasticmaterials with the shearmodulus a general functi...

A boundary element formulation is presented in this work for transient heat conduction analysis of threedimensional (3D) fiber-reinforced materials. The cylindrical-shaped fibers in a 3D matrix are idealized by a system of curvilinear line elements with a prescribed diameter. The variations in the temperature and flux fields in the circumferential direction are represented in terms of a trigono...

Buckling is investigated of a long thin cylindrical shell under longitudinal compression as modelled by the von KK armm an{Donnell equations. Evidence is reviewed for the buckling being localised to some portion of the axial length. In accordance with this observed behaviour the equations are rst approximated circumferentially by a Galerkin procedure, whereupon cross-symmetric homoclinic soluti...

Guided wave focusing has been developed as a promising technique for defect detection in pipeworks, where non-axisymmetric flexural modes are tuned so that ultrasonic energy can be focused at a target point in a pipe. If a defect is located at the target point, large amplitude reflected waves can be observed. In this study, the focusing phenomenon is analyzed using a semi-analytical finite elem...

We investigate the morphology of thin discs and rings growing in the circumferential direction. Recent analytical results suggest that this growth produces symmetric excess cones (e cones). We study the stability of such solutions considering self-contact and bending stress. We show that, contrary to what was assumed in previous analytical solutions, beyond a critical growth factor, no symmetri...