A bumper panel for preventing opening car doors from being damaged from hitting other objects has a design that can be interchanged. The bumper panel may have a design cover that slips over the rigid panel portion having resilient material layer over a rigid panel. The design cover may have an open end to enable the cover to slip over the rigid panel portion and may have mount apertures that align with mount fixtures when configured over the rigid panel. A design cover may be reversible and may have different designs on the inside various sides and surfaces of the design cover. As many as four designs may be displayed depending on the orientation and configuration of the design cover over the rigid panel. A bumper panel may be suspended from mount fixtures or retained along a wall or other object by mount brackets.

According to one aspect, a manifold assembly includes a skid, a low pressure manifold connected to the skid, and a high pressure manifold connected to the skid. In another aspect, the high pressure manifold has a modular configuration so that the high pressure manifold is disconnectable in whole or in part from the skid, and reconnectable in whole or in part to the skid. In yet another aspect, the high pressure manifold includes high pressure modules, all of which are in fluid communication with each other and each of which is adapted to be in fluid communication with at least one pump. In still yet another aspect, the low pressure manifold includes one or more flow lines, the high pressure manifold includes fittings, and the manifold assembly includes vibration isolators to dampen dynamic loading, the vibration isolators being disposed between the fittings and the one or more flow lines.

According to one aspect, a manifold assembly includes a skid, a low pressure manifold connected to the skid, and a high pressure manifold connected to the skid. In another aspect, the high pressure manifold has a modular configuration so that the high pressure manifold is disconnectable in whole or in part from the skid, and reconnectable in whole or in part to the skid. In yet another aspect, the high pressure manifold includes high pressure modules, all of which are in fluid communication with each other and each of which is adapted to be in fluid communication with at least one pump. In still yet another aspect, the low pressure manifold includes one or more flow lines, the high pressure manifold includes fittings, and the manifold assembly includes vibration isolators to dampen dynamic loading, the vibration isolators being disposed between the fittings and the one or more flow lines.

A bumper panel for preventing opening car doors from being damaged from hitting other objects has a design that can be interchanged. The bumper panel may have a design cover that slips over the rigid panel portion having resilient material layer over a rigid panel. The design cover may have an open end to enable the cover to slip over the rigid panel portion and may have mount apertures that align with mount fixtures when configured over the rigid panel. A design cover may be reversible and may have different designs on the inside various sides and surfaces of the design cover. As many as four designs may be displayed depending on the orientation and configuration of the design cover over the rigid panel. A bumper panel may be suspended from mount fixtures or retained along a wall or other object by mount brackets.

A bumper panel for preventing opening car doors from being damaged from hitting other objects has a design that can be interchanged. The bumper panel may have a design cover that slips over the rigid panel portion having resilient material layer over a rigid panel. The design cover may have an open end to enable the cover to slip over the rigid panel portion and may have mount apertures that align with mount fixtures when configured over the rigid panel. A design cover may be reversible and may have different designs on the inside various sides and surfaces of the design cover. As many as four designs may be displayed depending on the orientation and configuration of the design cover over the rigid panel. A bumper panel may be suspended from mount fixtures or retained along a wall or other object by mount brackets.

A shock absorber system includes a body, a component, and at least one primary attachment that secures the component on the body. A secondary attachment is configured to secure the component to the body upon breakage of the primary attachment. The secondary attachment includes a single-use shock absorber and a cable that is attached to the body and secured through the single-use shock absorber to the component.

A shock absorber system includes a body, a component, and at least one primary attachment that secures the component on the body. A secondary attachment is configured to secure the component to the body upon breakage of the primary attachment. The secondary attachment includes a single-use shock absorber and a cable that is attached to the body and secured through the single-use shock absorber to the component.

A simple self-tuned mass damper is hereby proposed for a broadened frequency band and which can be adapted to large and expensive structures as well as small and inexpensive structures alike. The novel self-tuned mass damper includes an auxiliary mass and a non-linear suspension, which is configured to connect the auxiliary mass to a vibrating structure. The mass of the auxiliary mass and the stiffness of the non-linear suspension are selected such that the natural frequency is at least 6 Hz and that the amplitude of the relative displacement of the auxiliary mass in respect to the vibrating structure is at most 12 mm.

A simple self-tuned mass damper is hereby proposed for a broadened frequency band and which can be adapted to large and expensive structures as well as small and inexpensive structures alike. The novel self-tuned mass damper includes an auxiliary mass and a non-linear suspension, which is configured to connect the auxiliary mass to a vibrating structure. The mass of the auxiliary mass and the stiffness of the non-linear suspension are selected such that the natural frequency is at least 6 Hz and that the amplitude of the relative displacement of the auxiliary mass in respect to the vibrating structure is at most 12 mm.

A moving vehicle includes a skid-steer electric motor vehicle chassis that is capable of traveling and an optical sensor provided on the electric motor vehicle chassis. The electric motor vehicle chassis includes a chassis body, a plurality of wheels that are provided as pairs of right and left wheels at the front and rear of the chassis body, and a driving unit that individually rotation-drives the pairs of right and left wheels. The optical sensor is disposed, in planar view, at a position nearby an axle line of a pair of right and left wheels on one side of the front and rear. A pair of right and left wheels on the other side of the front and rear is configured of wheels with rollers each having a wheel body and a plurality of rollers provided on an outer circumferential portion of the wheel body.