5 results about "Dihedral angle" patented technology

The invention provides an extension method for constructing a rigid foldable multi-tubular structure and a tubular structure. The extension method comprises the following steps: constructing a three-dimensional tetrahedron by setting the side length, the interior angle and the dihedral angle of a planar triangle; extending the bottom edges of the tetrahedrons, and determining new vertexes through geometric constraints to generate adjacent transverse extension tetrahedrons; then determining a heterogeneous tetrahedron of the basic tetrahedron through geometric constraint of a BOIII mechanism, and determining an axially extending tetrahedron based on the heterogeneous tetrahedron; the multiple foldable tubular structures are generated by repeating the steps of transverse extension and axial extension and modifying initial side length angle parameters in a matched mode. According to the method, through the steps of basic tetrahedron construction, transverse extension, axial extension and iterative expansion, a set tetrahedron relational expression is met in the process of executing the extension step, so that the problem that the shape complexity of a bent section of the foldable tubular structure needs to be simplified is solved, and the foldable tubular structure which is more flexible and reliable is provided; and the requirements of different engineering fields are met.

The present invention provides a carrier for circular polarization testing of a dihedral angle structure, which is applied to the technical field of electromagnetic wave polarization testing. The carrier is an integrally formed structure. The carrier has a support surface, and a fixing part for supporting the dihedral angle structure is arranged on the support surface. The included angle between the dihedral angle structure located on the support surface and the horizontal plane is 45°. The carrier for circular polarization testing of the dihedral angle structure provided by the present invention can improve the support stability of the dihedral angle structure and ensure the accuracy of the RCS characteristic measurement of the dihedral angle structure.

Novel functional poly(organosiloxane) resin compositions, methods of producing novel poly(organosiloxane) coating compositions, and coated substrates having improved properties suitable for, e.g., optical applications for achieving predetermined properties of refractive index, absorption coefficient and other properties. Specific embodiments comprise silicon precursors having a substituent that contains a fused aromatic structure exhibiting a butterfly shape, wherein the half-planes defined by aromatic rings joined by intermediate N and S atoms exhibit a dihedral angle of <165 #, whereas the C—S—C angle of the folded thiazine, in particular 1,4-thiazine, ring is less than 110 #. In on embodiment, the silicon precursor has a substituent that comprises an optionally substituted thiazine ring.

Various embodiments disclosed relate to a shaped abrasive particle. The shaped abrasive particle includes at least four major faces and at least six edges joining the four major faces. One of the at least four major faces is a first rake face, a second of the at least four major faces is a second rake face. The first and second rake faces are predominantly joined along only one common edge. A dihedral angle between the first rake face and the second rake face is in a range of from about 71 degrees to about 170 degrees.

The invention discloses a turbine blade and a design method thereof based on blade body end wall fusion. The design method comprises the following steps: preparing a blade grid; determining a fusion height boundary; determining a fusion width boundary; constructing a dihedral angle in-plane fusion shape; constructing circumferential distribution of the fusion height and the fusion width; and determining a blade body end wall fusion area according to the throat position. According to the design method, the regulation and control capacity of dihedral angle distribution formed by the end walls and the blades is enhanced, the fusion area is determined according to the throat positions of the blades according to the characteristic that the turbine performance is very sensitive to throat geometry, and design optimization of the turbine is achieved.