36 results about "Effective stiffness" patented technology

A vane assembly for a gas turbine engine is disclosed having lower thermally induced stresses resulting in improved component durability. The stresses in the vane assembly airfoils are lowered by increasing the flexibility of the vane platform and reducing their resistance to thermal deflection. This is accomplished by placing an opening along the vane assembly rail that reduces the effective stiffness of the platform, thereby lowering the operating stresses in the airfoils of the vane assembly. A removable seal is then placed in the opening in order to prevent undesired leakages, while maintaining the benefit of the increased platform flexibility.

A vane assembly for a gas turbine engine is disclosed having lower thermally induced stresses resulting in improved component durability. The stresses in the vane assembly airfoils are lowered by increasing the flexibility of the vane platform and reducing its resistance to thermal deflection. This is accomplished by placing an opening along the innermost vane assembly rail that reduces the effective stiffness of the platform, thereby lowering the operating stresses in the airfoils of the vane assembly. A removable seal is then placed in the opening in order to prevent undesired leakages, while maintaining the benefit of the increased platform flexibility.

A rake including a head, an elongate handle extending from the head, and a plurality of parallel, spaced-apart, flexible tines extending from the head opposite the handle. A brace is movable along the tines between first and second positions and limits a range of motion of the tines to change the effective length and thus the effective stiffness of the flexible tines. A locking device releasably secures the brace to the head in the first and second positions and preferably at locations between the first and second positions. Spacing between the tines remains unchanged as the brace moves between the first and second positions. The handle extends past the head to the tines improving stiffness of the head so that the rake is lightweight with a low profile.

A ligament assembly (2) comprising a resilient element (20) connected to a bone anchor (4) and a ligament (18), the resilient element (20) acting m a cantilever and resisting toads transmitted between the bone anchor (4) and the ligament (18) by virtue of the resistance to bending of the resilient element. The ligament (18) may comprise an artificial ligament (18) which is adapted to replace a human or animal ligament. The resilient element (20) may comprise a spiral spring and may act as a biasing element/shock absorber operatively coupled to the artificial ligament (18) to control the effective stiffness of the artificial ligament (18). Consequently, the resilient element (20) enables an effective stiffness of the artificial ligament (18) to be achieved that more closely approximates the stiffness of a natural ligament.

The invention discloses a GPU (Graphics Processing Unit) acceleration method for dynamic response analysis of a thin plate gridless Galerkin structure. The method comprises the following steps: reading sheet data into a host memory through a CPU (Central Processing Unit), calculating relevant data required by parallel processing of a GPU (Graphics Processing Unit) according to input data, and copying the obtained data into a GPU global memory; setting the number of thread blocks and the number of threads on the GPU, performing parallel acceleration calculation on shape function values corresponding to the nodes, then establishing a one-to-one mapping mode of the thread blocks and the cross nodes of the GPU, and performing parallel acceleration assembly on an overall stiffness matrix and amass matrix of the thin plate; correcting the overall stiffness matrix on the GPU according to boundary conditions, then obtaining a damping matrix and an effective stiffness matrix through the mass matrix and the corrected stiffness matrix, and performing triangular decomposition on the effective stiffness matrix; and carrying out dynamic response analysis on the thin plate in a GPU by adopting aNewmark method, and finally outputting a result of solving the displacement, speed and acceleration. According to the method, the solving efficiency of dynamic response analysis is greatly improved.

The invention discloses a combination system of energy dissipation coupling beams and viscous dampers and a design method of the combination system, and belongs to the technical field of earthquake resistance and disaster prevention of building structures. The combination system consists of the multiple energy dissipation coupling beams and the multiple viscous dampers. The multiple energy dissipation coupling beams are arranged between adjacent two wall columns side by side. The position between the adjacent two wall columns is divided into a plurality of holes through the multiple energy dissipation coupling beams. Each hole is internally provided with at least one viscous damper. In the combination system, the energy dissipation coupling beams can provide effective stiffness and a certain damping ratio, the viscous dampers can provide high additional damping ratio and dynamic stiffness, in this way, the stiffness of a shear wall structure can be ensured, and meanwhile, seismic action can be reduced through the damping ratio, wall thickness is reduced, the cost is reduced, the building space is reduced, and good promoting prospects are achieved.

The invention belongs to the field of robots and more specifically relates to a variable stiffness quadruped bionic quadruped robot flexible continuous body spine mechanism. According to the variable stiffness quadruped bionic quadruped robot flexible continuous body spine mechanism, two pairs of driving steel cables are symmetrically placed on the two sides of the transverse direction and the longitudinal direction of cross-shaped knuckle supports fixed on a square rubber strut in an equally paced manner; a differential driving spine is bent in the horizontal or vertical direction to realize flexible bending of the spine in the horizontal or vertical direction so that the motion flexibility and motion performance of a quadruped robot are improved; by oppositely placing two specially designed elastic elements with nonlinear force-deformation characteristics on the two sides of the longitudinal direction of the spine mechanism, a linear relation is established between an adjusting variable (steel cable telescopic amount) and the stiffness of a spine within an effective stiffness adjusting range; and therefore, the accurate stiffness control ability is obtained.

A system for releveling an elevator car floor with a landing floor includes a load weight sensor to sense a load weight of an elevator car at a landing floor, and a releveling controller operably connected to the load weight sensor to calculate a corrective velocity for the elevator car based on the load weight and estimates of the effective stiffnesses at the landing floor. A machine is operably connected to the releveling controller with both feedback and feedforward control and the elevator car to apply the corrective velocity to the elevator car thereby reducing a mismatch between the elevator car and the landing floor.

The present disclosure relates to a mounting assembly for supporting a machine. The mounting assembly comprises a support frame structure including a plurality of traverse members spaced apart from each other, each traverse member extending from a first longitudinal section to a second longitudinal section of the support frame structure, wherein each longitudinal sections and comprises a plurality of holes and respectively, and an attachment mechanism to increase effective stiffness of the support frame structure, the attachment mechanism comprising any or a combination of a plurality of attachments and a turnbuckle attachment to increase directional stiffness of the support frame structure, wherein the attachment mechanism arrests any or a combination of rolling mode of motion and pitching mode of motion of the support frame structure and the machine by increasing the effective stiffness of the support frame structure.

A damper assembly (22) is useful for controlling elevator ride quality. The damper assembly (22) includes a resilient member that deflects responsive to a load. An effective stiffness of the resilientmember is less than an associated rate of deflection of the resilient member. The resilient member includes a first portion (30, 40) that deflects prior to a second portion (32, 42) responsive to aninitial loading on the damper assembly (22).