Systems and a method for resisting a fluctuation in a value of a parameter relating to well equipment using a magnetorheological dampener system are described herein. The method includes continuously determining the value of the parameter relating to the well equipment, determining a fluctuation in the value of the parameter, and comparing the fluctuation in the value of the parameter to a preset limit. The method also includes energizing an electromagnet to increase a viscosity of a magnetorheological fluid (MRF) if the fluctuation exceeds the preset limit.

A shock absorbing system for force attenuation, impact modification or reduction, employs an envelope having a chamber containing a first working fluid, the envelope deformable in response to the impulse to attenuate impact force. A plurality of resilient supplemental absorber elements dispersed within the chamber. The plurality of resilient supplemental absorber elements are deformable in response to the force to assist in attenuating impact force and provide additional resilient restoring force to return the envelope to a pre-impact shape. In alternative implementations, a unitary cell for energy dissipation employs an envelope having a chamber containing a first working fluid and an inner element contained within the chamber and having an inner chamber containing a second working fluid.

Disclosed is a method for calculating a pressure loss of a parallel R-type automobile vibration damper. The automobile vibration damper includes a frame, a spring, an axle, a hydraulic cylinder, an upper oil tank, a piston, a lower oil tank, and a resistance adjustment section. The resistance adjustment section is composed of 4 capillaries connected in parallel and solenoid valves. The four capillaries are all coiled into an M shape. The 4 capillaries are R8, R4, R2, and R1 and are connected in series with solenoid valves V.sub.R8, V.sub.R4, V.sub.R2, V.sub.R1, respectively. Due to the viscous effect of oily liquid in the cylinder, when the oily liquid flows through the resistance adjustment section, damping can be adjusted by adjusting the configurations S.sub.Rn of the solenoid valves V.sub.R8, V.sub.R4, V.sub.R2, and V.sub.R1.

Devices, systems, and methods for shock absorption are provided herein. Collapsible shock absorption devices have an inner wall having at least one orifice, an outer wall, and a fluid sealed within the outer wall can mitigate sharp increases in force during loading and can better distribute loading forces. In some cases, collapsible shock absorption devices disclosed herein are used for prevention of injury to a biological tissue of a subject or damage to an inanimate object.

A shock absorbing system for impact energy dissipation employs removable unitary cells of compressible members in communication with a reservoir and containing a first working fluid. Resilient structural members may be placed intermediate the compressible members to deform responsive to compression to provide both energy dissipation and resilient recovery of the compression cylinders to their uncompressed state.

A power transmission system includes a shaft, a stator disposed within the shaft and substantially concentric with the shaft; and at least one supporting element positioned between the stator and the shaft and configured to support the shaft on the stator to reduce a vibration of the shaft and allow the shaft to rotate relative to the stator. A gas turbine engine including the power transmission system is also described.

Systems and a method for resisting a fluctuation in a value of a parameter relating to well equipment using a magnetorheological dampener system are described herein. The method includes continuously determining the value of the parameter relating to the well equipment, determining a fluctuation in the value of the parameter, and comparing the fluctuation in the value of the parameter to a preset limit. The method also includes energizing an electromagnet to increase a viscosity of a magnetorheological fluid (MRF) if the fluctuation exceeds the preset limit.

Various techniques are provided for an expandable energy absorbing fluid bladder. In one example, the fluid bladder includes a primary portion and a secondary portion. The secondary portion can be configured to expand or increase in volume when the fluid bladder is subjected to a pulse greater than a threshold pulse. Expansion of the secondary portion can allow fluid or additional fluid to flow into the secondary portion and thus decrease a peak pulse and, thus, avoid rupture of the fluid bladder.

A shock absorbing system for impact energy dissipation employs removable unitary cells of compressible members in communication with a reservoir and containing a first working fluid. Resilient structural members may be placed intermediate the compressible members to deform responsive to compression to provide both energy dissipation and resilient recovery of the compression cylinders to their uncompressed state.

Springs of different types are provided with the ability to dynamically change stiffness. A number of embodiments feature hollow tubing wherein stiffness change is accomplished due to the pressure change inside the tubing which affects the stresses in tubing walls. In other embodiments inside pressure change causes variability in tubing's cross-section shape and size leading to large changes in stiffness. A number of embodiments feature spring coil diameter variability achieved by a variety of means and resulting in highly substantial changes in stiffness and for some embodiments spring length variability thus providing them with actuation capability in addition to stiffness variability.