A multi-flexure payload isolation device for isolating a payload from outside forces. The device can include a housing comprising an interior cavity configured to receive and support the payload. The device can further include a first flexure and a second flexure, each including a plurality of spokes made of a pseudoelastic shape-memory alloy anchored to the housing and configured to support the payload from the housing through an opening in the housing. The first and second flexures can each further include a common hub attached to a side of the payload and disposed in the opening in the housing wherein the each of the pluralities of spokes are anchored to the respective common hub.

The present invention provides a test device for a quasi zero stiffness isolator, and belongs to the technical field of vibration response tests of isolators. The device comprises a negative stiffness adjusting mechanism, a positive stiffness adjusting mechanism, and a beam-damping block mechanism. The negative stiffness adjusting mechanism and the positive stiffness adjusting mechanism are connected successively and installed on a beam-mass block system. The test device for the quasi zero stiffness isolator can realize smooth longitudinal vibration of a tested system, and can also flexibly adjust the positive stiffness value and the negative stiffness value of an overall mechanism. The present invention is suitable for a vibration model test of the quasi zero stiffness isolator, and solves the problems of complicated use method, impossibility of flexible adjustment of mechanism stiffness and complicated replacement process of stiffness elements in the device for the existing quasi zero stiffness isolator.

The invention provides a vibration isolation system (IS), comprising a piston (402) to carry a payload, a connecting member (410), a spring (404) and a flexible member (408). The spring is arranged to support the piston along a direction with a positive stiffness. The flexible member is arranged to apply a force to the piston along the direction via the connecting member with a negative stiffness.

A combined air spring system includes an upper cover plate, an air bag, an upper end plate and a lower end plate. An outer periphery of the upper cover plate is connected with an outer periphery of the upper end plate through the air bag. A low-position sand clock elastomer is connected between the upper end plate and the lower end plate. A pressing plate is installed at a bottom portion of the upper cover plate, and a high-position elastomer is connected between the upper cover plate and the pressing plate. A limiting table is arranged at a bottom portion of the pressing plate. A limiting groove is formed in a top face of the upper end plate. The limiting table is located in the limiting groove in a deflated state.

An hourglass type air spring assembly includes an upper cover plate, an air bag, an upper end plate and a lower end plate. An outer periphery of the upper cover plate is connected with an outer periphery of the upper end plate through the air bag. A low-position hourglass elastomer and a high-position elastomer which are integrally formed are connected with each other between the upper end plate and the lower end plate. An annular notch is formed between the low-position hourglass elastomer and the high-position elastomer, and an annular rigid partition plate matched with the annular notch is arranged in the annular notch.

An energy damping and displacement control device is disclosed. The energy damping and displacement control device can include a contact protrusion and an energy damping pad constructed of a resilient material. The energy damping pad can have a first face oriented along a first plane. The energy damping pad can also have a second face oriented along a second plane transverse to the first plane, and toward the contact protrusion. In a static condition, the first and second faces of the energy damping pad can be separated from the contact protrusion. In a dynamic condition, displacement motion of the contact protrusion relative to the energy damping pad can be limited by contact with at least one of the first or second faces of the energy damping pad, which provides energy damping and motion displacement control of the contact protrusion in multiple axes.

A vibration-proof mount which is interposed between a vibration device including a vibration source and an elastic member disposed on a foundation surface includes an upper base plate including a first mounting portion where the vibration device is mounted, a lower base pate arranged below the upper base plate and supporting the upper base plate, and a plurality of connecting members connecting the upper base plate and the lower base plate, the plurality of connecting members including at least two or more first connecting members disposed between the first mounting portion and the lower base plate at intervals from one another. The first mounting portion is configured to have higher rigidity than the lower base plate.

The present invention discloses a three-dimensional seismic and vibration isolator with adaptive stiffness property in both vertical and horizontal directions. The isolator comprises an upper connection plate, a middle plate, an under connection plate, a disc spring, pre-compressed helical springs, a laminated lead rubber bearing, and viscous dampers. The upper connection plate, middle connection plate and under connection plate are made of high strength low carbon steel with high loading capacity. The upper connection plate and middle plate are tightly contacted by the occlusive design, to guide the vertical motion. The vertical isolation system is made up of the disc spring, pre-compressed helical spring, and viscous damper. The horizontal isolation system comprises the laminated rubber bearing, pre-compressed helical spring and viscous damper. The invention adopts the theory of nonlinear adaptive vibration control technology and can be used to protect building structures or instruments from the seismic strikes or other environmental vibrations.

A multi-dimensional magnetic negative-stiffness mechanism and a multi-dimensional magnetic negative-stiffness vibration isolation system composed thereof are provided. The multi-dimensional damping system is composed of a positive-stiffness mechanism, a multi-dimensional negative-stiffness mechanism, a floating frame, a vibration isolated body, and a mounting base. The positive-stiffness mechanism is a traditional elastic element connected to the vibration isolated body and the mounting base, and provides supporting forces in an X direction, a Y direction, and a Z direction, and a basic vibration isolation function. The multi-dimensional negative-stiffness mechanism is composed of at least two negative-stiffness magnetic groups. Each negative-stiffness magnetic group may provide one-dimensional or two-dimensional negative stiffness. Through a series connection of the at least two negative-stiffness magnetic groups, a two-dimensional or three-dimensional negative-stiffness effect may be implemented to improve the vibration isolation performance of the system in multiple dimensions.

A shock absorber and a metal cover reduce contact noise generated as a shock absorbing member hits a collar and have higher vibration damping performance. A shock absorber absorbing vibration to a heat insulator covering an exhaust manifold as a vibration source includes a collar, a grommet, an annular compression mesh including a shock absorbing material, and a spiral spring overlaid on a compression mesh. The compression mesh has a center hole loosely receiving a collar shaft. The spiral spring spiral in a plan view has a spring constant equal to or smaller than that of the compression mesh. The compression mesh includes a restriction ridge along a lower large-diameter portion to restrict radial movement of the spiral spring relative to the compression mesh. The circumferential contact area X of the lower large-diameter portion with the restriction ridge ranges between 40% and 55%.