A gas turbine engine component includes an inner support structure surrounding an engine center axis and fixed to an engine static structure, an outer support structure spaced radially outward of the inner support structure, and a curved beam comprised of a plurality of curved beam spring segments that are positioned adjacent to each other to form a ring. The inner and outer support structures are coupled together around the curved beam to enclose the curved beam therebetween and form an assembly. A bearing is spaced radially inward of the assembly.

Systems and methods for limiting transmission of vibrations and forces causing vibrations from one element to another are provided. A vibration isolator may include a compressible inner member and an outer member compressible with the inner member. The outer member may be positioned at least partially around the inner member to provide lateral support to the inner member. The outer member may maintain a consistent diameter and compression force when in a compressed state. The outer member may include a tube with a zero or near-zero Poisson's ratio.

A test stand for an unmanned aerial vehicle comprising: a base arranged to make contact with the ground; a frame extending from the base, the frame comprising at least a first side portion and a second side portion that define a space therebetween; and a mount slidably attached to the frame within the space, the mount configured to affix to an unmanned aerial vehicle such that the mount and the unmanned aerial vehicle slide within the defined space in a direction parallel to the frame during a test flight.

A test stand for an unmanned aerial vehicle comprising: a base arranged to make contact with the ground; a frame extending from the base, the frame comprising at least a first side portion and a second side portion that define a space therebetween; and a mount slidably attached to the frame within the space, the mount configured to affix to an unmanned aerial vehicle such that the mount and the unmanned aerial vehicle slide within the defined space in a direction parallel to the frame during a test flight.

A leaf spring (100) comprises at least two spring arms (120, 130) and an inner fixing hole (110). The at least two spring arms (120, 130) are evenly distributed around a center of the inner fixing hole (110); each spring arm is of the same structure, and an outer fixing hole (122) is disposed at an outermost end of each spring arm. Further provided are a leaf spring group and a compressor. The leaf spring group comprises multiple leaf springs, and the compressor comprises the leaf spring group. The provided leaf spring has a structure of multiple concentric circular arms or a structure of concentric vortex arms, and the leaf spring has smaller equivalent mass, so that the rigidity and inherent frequency requirements can be met without the need of increasing the mass of the components, thereby reducing the product mass and saving the cost.

A leaf spring (100) comprises at least two spring arms (120, 130) and an inner fixing hole (110). The at least two spring arms (120, 130) are evenly distributed around a center of the inner fixing hole (110); each spring arm is of the same structure, and an outer fixing hole (122) is disposed at an outermost end of each spring arm. Further provided are a leaf spring group and a compressor. The leaf spring group comprises multiple leaf springs, and the compressor comprises the leaf spring group. The provided leaf spring has a structure of multiple concentric circular arms or a structure of concentric vortex arms, and the leaf spring has smaller equivalent mass, so that the rigidity and inherent frequency requirements can be met without the need of increasing the mass of the components, thereby reducing the product mass and saving the cost.

A rotating machine system include a rotating machine. The rotating machine system can include a housing. The housing can include an inner surface. The housing can surround at least a portion of the rotating machine. The inner surface of the housing can be spaced from the rotating machine such that a space is defined therebetween. The rotating machine system can include a plurality of vibration isolators. The vibration isolators can be positioned in the space and can be operatively connected to the rotating machine and to the inner surface of the housing. The vibration isolators can be compression-type vibration isolators.

The present invention belongs to the technical fields of novel structure design and lattice material design, and refers to structures, lattice materials, and lattice cylindrical shells with simultaneous stretch- and compression-expanding property. First, use the local tension-compression asymmetry in the tension modulus and compression modulus generated by the contact nonlinearity of the tension springs to construct a type of 2D structures and lattice materials with stretch- and compression-expanding property. Then by assembling the 2D structures in different directions, 3D structures and lattice materials can be constructed. Meanwhile, a lattice cylindrical shell can also be constructed by using the 2D stretch- and compression-expanding structures as the unit cell. The structures and lattice materials presented in this invention can be used as a specific functional material and has a promising application in the fields of energy absorption, vibration reduction, medical treatment, wave propagation, intelligent components, and so on.

The present invention belongs to the technical fields of novel structure design and lattice material design, and refers to structures, lattice materials, and lattice cylindrical shells with simultaneous stretch- and compression-expanding property. First, use the local tension-compression asymmetry in the tension modulus and compression modulus generated by the contact nonlinearity of the tension springs to construct a type of 2D structures and lattice materials with stretch- and compression-expanding property. Then by assembling the 2D structures in different directions, 3D structures and lattice materials can be constructed. Meanwhile, a lattice cylindrical shell can also be constructed by using the 2D stretch- and compression-expanding structures as the unit cell. The structures and lattice materials presented in this invention can be used as a specific functional material and has a promising application in the fields of energy absorption, vibration reduction, medical treatment, wave propagation, intelligent components, and so on.

A pedal emulator (20, 100) is provided. The pedal emulator includes an emulator piston (28, 102) coupled to a damper (46, D1) that is contained within a housing (22, 104). The damper is surrounded by first (34, S1) and second (38, S2) springs that are carried by a lower spring seat (114), the lower spring seat being upwardly biased by a third spring (S3), for example a wave spring. The first and second springs and the third spring cooperate to provide a counter-force that is tailored to the desired feel of the pedal. First and second sensors measure travel (72, 74) and force in response to downward compression of the emulator piston, and the damper provides hysteresis upon return travel of the emulator piston. A method comprising: providing a brake pedal emulator (100) including an emulator piston (102), the emulator piston (102) being operatively coupled to a brake pedal, wherein the brake pedal emulator (100) is adapted to provide a first force response during a first portion of travel of the emulator piston (102) and a second force response during a second portion of travel of the emulator piston (102); detecting a sequence of actuations of the brake pedal using the brake pedal emulator (100) for conversion into a selected driver input command; and providing vibratory feedback to the brake pedal using a haptic actuator, the vibratory feedback being in response to the selection of a driver input command.