3 results about "High stiffness" patented technology

The invention belongs to a truss support structure in the technical field of remote space sensing and aims to solve the technical problem of providing the ring-shaped carbon fiber truss support structure of the coaxial three-reflector spatial optical system. In the technical scheme, the ring-shaped carbon fiber truss support structure comprises an upper carbon fiber support ring, a lower carbon fiber support ring, a first carbon fiber support rod, a second carbon fiber support rod, a third carbon fiber support rod, a fourth carbon fiber support rod, a fifth carbon fiber support rod, a sixth carbon fiber support rod, a first carbon fiber support rod coupling component, a second carbon fiber support rod coupling component, a third carbon fiber support rod coupling component, a fourth carbonfiber support rod coupling component, a fifth carbon fiber support rod coupling component, a sixth carbon fiber support rod coupling component, a first embedded component, a second embedded component, a third embedded component, a fourth embedded component, a fifth embedded component and a sixth embedded component. The upper end and the lower end of the structure are respectively provided with the upper carbon fiber support ring and the lower carbon fiber support ring which adopt the same specifications and are embedded coaxially in a 120-degree angle; the carbon fiber support rods adopt a hollow cylindrical rod structure, and the carbon fiber support rod coupling components are provided with double flange interface structures arranged in a 60-degree angle; and the hollow cylindrical inner holes of two carbon fiber support rods are respectively sleeved on two flange interfaces of the carbon fiber support rod coupling components and are fixedly glued to form the closed ring-shaped carbon fiber truss support structure. The structure has a light weight, high stiffness, high strength and high positioning accuracy.

The present invention relates to polypropylene impact copolymer compositions which exhibit improved stiffness without degrading the impact resistance performance. The polypropylene impact copolymer comprises a matrix and a dispersed phase. The matrix comprises a polypropylene homopolymer or a propylene/alpha-olefin random copolymer which comprises more than 50 wt. % of units derived from propylene monomer. The matrix should have a relatively high crystallinity, preferably 50% or greater. The polypropylene homopolymer or a propylene/alpha-olefin random copolymer preferably has a MWD between 4 and 8, such as typically obtained using Ziegler-Natta catalysts. The dispersed phase in the impact copolymer comprises an ethylene-propylene copolymer which comprises from 45 to 70 wt. % of units derived from an ethylene monomer. Preferably the dispersed phase comprises from 20 to 50 percent by weight of the polypropylene impact copolymer.

The invention discloses an optimized design method of Gantry-type machine tool stiffness based on segmentation configuration. 3D model of Gantry-type machine is established. Parameter-driven of segmentation configuration modifies and adjust 3D parameter, then a series of 3D model as a structural template can be obtained. A sample library of Gantry-type machine tool can be formed by performance data from finite element analysis. According to the stiffness requirements of the machine tool processing, the initial plan of Gantry-type machine tool structure inputted by the design personnel is optimized based on the basic configuration and segmentation configuration. According the method, the stiffness of Gantry-type construction in early designing stage has been predicted, which provides a reference for designing high stiffness gantry-type structure and reduce the experiment cost of modification and trial production in the process of designing Gantry-type machine tool.