Abstract: A platform has a truss frame including at least one frame chord, legs attached to the frame chord, at least one assembly mounted between the legs and the frame chord, the assembly including an actuator arranged to move the frame chord, and a solar altitude adjustment arranged to adjust height of the frame chord. A solar tracking platform has a truss frame including at least one frame chord, block assemblies attached to the frame chord, at least one solar panel attached to the block assemblies, legs attached to the frame chord, at least one assembly attached to the frame chord, the assembly including an actuator to move the frame chord, and a multi-array drive shaft attached to the actuator, the drive shaft configured to connect the solar tracking platform to at least one other solar tracking platform.

Abstract: An adaptive energy absorption system for a vehicle seat is disclosed, utilizing an adaptive energy absorber or variable profile energy absorber (VPEA) for mitigating occupant injury due to extreme vehicle movement (e.g., during a vehicle shock event), and/or for mitigating vibration experienced by an occupant of the vehicle seat during normal vehicle operating conditions. The adaptive energy absorption system achieves the aforementioned objectives for a wide range of occupant weights and load levels. Various configurations of dual-goal energy absorption apparatuses that enable both shock mitigation and vibration isolation are disclosed.

Abstract: A goods display hook which enables salespersons to quickly and easily get information on the empty state of the goods display hooks. In a goods display hook comprising a main body engageable with a horizontally extending bar assembled in a goods display furniture and an arm including a base end supported by the main body and a goods hanging section extending from the base end section, the goods display hook further comprises a bias means for urging the arm in the direction that the goods hanging section tilts upwardly, the goods hanging section of the arm having a lamp at a free end thereof, the main body having a power source for the lamp, a switch device for the lamp and a shaft providing the arm with a pivotal movement, wherein the switch device is actuated by the arm to turn on the lamp when all the goods hung on the arm are removed which causes a pivotal movement of the arm in the direction that the goods hanging section tilts upwardly by the action of the bias means.

Abstract: A device and method for suspension of a vehicle seat by means of additional volumes, in particular a utility vehicle seat, comprising at least one air spring for height adjustment of a seat part of said air spring being arranged between the seat part and a lower part, and a control device for controlling the supply and discharge of at least one additional volume to or from the air spring, wherein, at predefinable speed or acceleration values of a spring movement of the air spring, the additional volume which can be supplied or discharged can be switched on or off by means of the control device in such a way that, in end-of-travel regions of the air spring, the profile of a force/travel air spring characteristic during an extension and/or return spring movement of the air spring does not exhibit any incline in a first and in a second range.

Abstract: An appliance includes a leg for support upon a support surface, an interlock switch mechanically coupled to the leg and electrically coupled to control circuitry of the appliance, an anti-tip bracket having an aperture configured to receive a portion of the leg, and means for operating the interlock switch when the leg is properly positioned within the aperture. In one example, an actuator is coupled to the leg and is movable relative to the leg when the leg is positioned within the aperture. In another example, the interlock switch includes a first and second electrode, and selective electrical contact occurs between the first and second electrodes when the actuator is moved. In another example, a member projects from the appliance and the anti-tip is configured to receive a portion of the member. A method is also provided for preventing use of an appliance due to improper installation of the appliance.

Abstract: A method and apparatus for a low-profile suspension system, which provides coarse and fine suspension control to an object supported by the low-profile suspension system. Coarse suspension is provided to adaptively control a position of the object through pneumatic support devices. Pneumatic pressure is adaptively increased in the pneumatic support devices to support an increasing weight of the object, while pneumatic pressure is adaptively decreased in the pneumatic support devices to support a decreasing weight of the object. Fine suspension control is provided through rotational actuation of a shock absorbing device through a right-angle gear drive. By rotationally actuating the shock absorbing device, a range of stroke of the shock absorbing device along a vertical direction is minimized. Position equalization control is further provided to maintain a position of the object along an axis that is orthogonal to the coarse and fine suspension axis.

Abstract: An active vibration damping system having a supporting spring for addressing a static force from a payload, and an independent actively isolated damper positioned in parallel between a payload and a source of vibration for damping dynamic force from the payload to an actively isolated point. The actively isolated damper includes a small intermediate mass, distinct and decoupled from the payload mass, and a passive isolator element for dynamic coupling of the isolated platform to the small intermediate mass. The small intermediate mass provides a point to which dynamic forces from the payload may be dampened. The active damper also includes at least one actuator coupled at one surface to the small intermediate mass and coupled at a second surface to the vibrating base platform. A motion sensor may also be provided on the small intermediate mass so as to generate a feedback signal as a function of the movement of the small intermediate mass.

Abstract: A suspension system for a seat of a vehicle comprises a base, a linkage, and a seat attached to the base via the linkage. A pneumatic shock absorber provides a respective resistance level against movement of the seat with respect to the base based on a corresponding pressure level of air or gas within the pneumatic shock absorber. A set of cylindrical members are spaced apart beneath the seat. A tension member is arranged to engage the cylindrical members. The tension member is attached to the seat via a bracket. An electric motor is capable of driving one of the cylindrical members. A first sensor is arranged to detect first sensor data associated with an instantaneous position of the seat versus time. A controller generates a first control signal for the electric motor to change a height of the seat in opposition to a change in the instantaneous position of the seat and a second control signal to change the pressure level.

Abstract: A vibration isolation device which dampens vibration of an object. The device includes a vibration isolation unit that can be activated in a plurality of vibration isolation modes, an acquisition unit that acquires estimate information associated with vibration of a floor, in which the acquisition unit receives data associated with an influence degree of seismic vibration and an influence time zone of the seismic vibration from an external device, and a control unit that selects a vibration isolation mode from the plurality of vibration isolation modes, in accordance with the estimate information acquired by the acquisition unit, and activates the vibration isolation unit in the selected vibration isolation mode. The control unit switches between the vibration isolation modes of the vibration isolation unit in accordance with the influence degree and the influence time zone.

Abstract: A vertically adjustable item of furniture with a vertical pipe, a supporting base arranged at a first end of the vertical pipe, a guide bush fastened to a second end of the vertical pipe opposite to the supporting base, a cylinder which is arranged coaxially in the vertical pipe a piston which divides the cylinder into a first work chamber and a second work chamber, a piston rod fastened by its first end to the piston extends through the second work chamber and a connection between the first work chamber and the second work chamber which can be blocked by a valve actuatable by an actuating device. The valve is controllable electromagnetically. The furniture item comprises a sensor or switch which generates a signal causing the valve to close when the piston reaches a position in the cylinder near the valve.

Abstract: An electronic device includes a base unit, a display unit, at least one sensor, and at least one rotary motor. The display unit is movably connected to the base unit. The sensor is located on the display unit, for receiving and transmitting a signal. The rotary motor is located in the base unit, for driving the display unit to rotate with the base unit as a support according to the signal. The sensor receives a user instruction to control the rotation direction and angle of the display unit, so as to avoid manual adjustment or save the cost of purchasing components like a swivel platform.

Abstract: A vessel (1) with a motion compensation platform (4), which platform is provided with at least one carrier (6) for bearing, moving and/or transferring a load, actuators (5) for moving the carrier relative to the vessel, preferably in six degrees of freedom, a control system for driving the actuators (5), and motion sensors for measuring motions of the vessel (1) relative to the at least one element in the surrounding area, which measurements are used as input for the control system, wherein at least one at least partly passive pressure element (9) is provided for applying, during use, a pressure to the carrier for at least partly bearing this.

Abstract: A multi-axis gimbal has each axis defined by a respective spherical shell driven by a flat, compact motor attached to the driven shell and to a next outer shell (or to an external mounting platform, in the case of the outermost shell). The shells rotate about respective axes. In one configuration, the outermost shell is referred to as the “azimuth” shell because in use it rotates about a vertical axis. The next inner shell is an elevation shell that rotates about a first horizontal axis that is orthogonal to the axis of the camera or other sensor payload. An optional third shell can be used to provide “roll” motion, such as rotating a camera about its axis to obtain a particular rotational orientation with respect to a target.

Abstract: A damping apparatus that supports and dampens a stage apparatus that positions and drives a stage to a target position is provided herein. The damping apparatus including a support plate part, a support force generating means, and a first controlling means. The support plate part supports the stage apparatus. The support force generating means exerts a damping action by applying a support force to the support plate part in the vertical directions. The first controlling means uses the acceleration of the stage, which is derived from a target track, to the target position, to control the support force generated by the support force generating means so as to compensate for forces that both occur as a result of the acceleration of the stage and cause the support plate part to tilt. The present invention controls vibration and the tilt of a base plate with high precision.

Abstract: A method of manufacturing an antivibration device that comprises a hydraulic element, the method including at least one overmolding step during which a plastics material connection piece is overmolded over the hydraulic element after said hydraulic element has been closed.

Abstract: An automatic apparatus for leveling suspended articles or hung objects to an angle relative to a reference. The shift lever assembly (112), used as a gravity reference, is activated when the pendulum member swings horizontally in response to slightest inclination or tilt, thereby causing the conductor pin (114.14) to contact one side of a pair of conductor plates (114.24b) or (114.24b). The contacting of the conductor pin to one side of the pair of conductor plates (114.24b) or (114.24b) completes the electrical circuit and allows the electrical storage device (118) to provide electrical current to the planetary motor (116), causing it to rotate. The turning of the planetary motor (116) causes the shift lever assembly (112) to automatically shift the elongated lever arm (112.10) against the rigid axle (122.22), thereby shifting the center of balance of the object in the opposite direction of the rotation of the wheel-like driven gear (112.20). Leveling occurs when the elongated lever arm (112.

Abstract: The invention provides a rotating table for a display device which can rotate around the horizontal shaft by a manual operation in addition to a small motor drive. A rotating table for a display device includes a rotating member arranged so as to be rotatable around a horizontal shaft, and in which the display device is arranged, a balancing device balancing with a gravity moment around the horizontal shaft in the display device, and a first motor-driven rotating mechanism rotating the rotating member around the horizontal shaft, and the first motor-driven rotating mechanism includes gear trains converting a rotation of an electric motor into a rotation of the rotating member, and a rotation allowing device allowing a rotation of the gear trains only in a case of a rotation having a torque not less than a predetermined torque with respect to the rotation from the rotating member side.

Abstract: A disk drive test slot thermal control system includes a test slot including a housing having an outer surface, an internal cavity defined by the housing and including a test compartment for receiving and supporting a disk drive transporter carrying a disk drive for testing, and an inlet aperture extending from the outer surface of the housing to the internal cavity. The disk drive test slot thermal control system also includes a cooling conduit, and a thermoelectric device mounted to the cooling conduit. The thermoelectric device is configured to cool or heat an air flow entering the internal cavity through the inlet aperture.

Abstract: A quakeproof plinth is adapted to make a showpiece mount vertically go down without a tilt so as to cushion and shelter a showpiece seated thereon from impact force exerted on the entire showpiece. A plinth (100) of the present invention is comprised of a showpiece mount (110), a supporting member (120) capable of supporting the showpiece mount so as to move the same upward and downward, basement shock absorbers (130) enabling the showpiece mount to be shock-absorbingly bumped down thereon, a vibration detector (140), and an actuating device (150) activated to move the showpiece mount downward in response to a detection signal produced from the vibration detector.

Abstract: An omnipositional cable-suspension system suspends an inanimate object. A pair of spaced apart holes pass through the object. A first closed cable loop passes through both of the holes and a first hooking point, so that a first cable is movable within the holes. A second closed cable loop passes through both of these holes and to a second hooking point, so that the second cable is also movable within the holes. The inanimate object can be moved from one position to another, while the object remains stable in any position so placed. This omnipositional cable-suspension system enables the suspension of any inanimate object (the “object”) that can be readily moved to any position about its three-dimensional axis without changing the cable-suspension system of the object. The object can be repositioned to any other stationary position as many times as desired.

Abstract: A gimbal system. The gimbal system may include space-saving features configured to accommodate one or more payload components, thus increasing the payload capacity of the gimbal ball without necessarily increasing the outer dimensions of the gimbal ball. Alternatively, or in addition, the gimbal system may include a motor configured to move at least one gimbal relative to another gimbal about a first axis, with the motor peripherally mounted distal the axis.

Abstract: The invention relates to a device for adjusting a vehicle seat, the frame structure (4, 5, 6) of which can be adjusted using drive motors (40) having presupported gear units (39), and the vehicle seat is accommodated on two seat rails (1, 2) arranged parallel to each other. The frame structure (4, 5, 6) of the vehicle seat can be adjusted spherically using lifting elements (8, 9, 10) in two planes separated from each other.

Abstract: A vibration isolation system couples two resonant systems to provide isolation of transverse vibrational motions. The first system incorporates a plurality of tunable inverse pendulum assemblies. The second system incorporates a table of large mass suspended at several points from the inverse pendulum assemblies. The table is further suspended from the pendulum assemblies at each point via an assembly to isolate vertical vibrational motion.

Abstract: A platform that supports a sample plate such as a microtiter plate, a multi-well plate of any size, or a glass slide with sample spots distributed over its surface, and presents the plate for assay detection by a movable scanning head that has a field depth on the millimeter scale is leveled or otherwise adjusted in a planar orientation by an apparatus that includes a rocker plate, position sensors, and motorized risers arranged on the apparatus to provide the rocker plate with tilting capability along either or both or two orthogonal axes.

Abstract: A distributed network vibration isolation system includes several vibration isolation nodes distributed throughout a structure. The nodes wirelessly intercommunicate and include a passive structural isolation device and an active structural isolation device. The nodes work together via wireless communication to isolate a payload from a disturbance source.

Abstract: A system and method for isolating a mass from vibration including an actuator 34 operably connected to the mass 32, the actuator 34 being responsive to a combined control signal 46; a position sensor 36 operably connected to measure position of the mass 32, the position sensor 36 generating a position signal 38; a comparator 51 responsive to the position signal 38 and a position setpoint signal 58 to generate a position error signal 50; and a combination controller 40 responsive to the position error signal 50 to generate the combined control signal 46; wherein the combination controller 40 adjusts the combined control signal 46 to change system characteristics when the position error signal 50 is outside an operating range.

Abstract: A vibration isolation device which damps vibration of an object includes a vibration isolation unit which can be activated in a plurality of vibration isolation modes, an acquisition unit which acquires estimate information associated with vibration of a floor, and a control unit which selects a vibration isolation mode from the plurality of vibration isolation modes in accordance with the estimate information acquired by the acquisition unit, and activates the vibration isolation unit in the selected vibration isolation mode.

Abstract: A look-ahead detection system (LADS) that actively controls the suspension of at least some of the seats in a watercraft to drastically reduce the shock and/or vibrations experienced by passengers within the seats caused by waves, other water conditions and/or the bending of the craft as it travels through the water. The look-ahead detection system utilizes downward-looking sensors to help the system predict when the craft will strike the water and how strong the impact will be. That is, the look-ahead detection system uses the sensors to look forward in time and down in space.

Abstract: An automatic stabilizing device. A base plate includes a through hole. An imbalance detecting mechanism is disposed on the base plate and includes a detecting member and an engaging member connected thereto. The detecting member is movably disposed inside the through hole. A sliding support plate is disposed on the base plate and detachably connected to the imbalance detecting mechanism. The sliding support plate includes an engaging hole in which the engaging member is detachably engaged. A first resilient member is connected between the base plate and the sliding support plate, providing a first predetermined resilience to the sliding support plate. When the base plate swings to extend the detecting member from the through hole, the engaging member moves and disengages from the engaging hole, and the sliding support plate slides to protrude from the base plate by the first predetermined resilience.

Abstract: A system if used to compensate for guide flatness errors and/or shifting of a support. The system comprises one or more of the supports, an actuating system, the guide, a fluid or magnetic bearing, and a compensation system. The one or more support devices have one or more openings. The support devices are coupled to the actuating system, which is configured to move the support devices. The guide passes through respective ones of the openings. The fluid or magnetic bearings are configured to guide the respective support devices along the guides. The compensation system is coupled to respective ones of the support devices adjacent each of the fluid or magnetic bearings. The compensation system is configured to compensate for any non-straight areas of the guides or shifting (e.g., thermal shifting) of the support devices, which is done through moving of the support devices with respect to the guides during movement of the support devices along the guides.

Abstract: A two mass vibratory apparatus for processing work material includes a bed defining a transport surface for receiving the objects, an elastic amplifier having a first end connected to the bed and a second end, and a base connected to the elastic amplifier second end. A linear actuator is mounted on the base and adapted to generate a linear vibratory force that is amplified by the elastic amplifier thereby to move the bed in a vibratory motion, so that the work material moves in response to the vibratory motion of the bed.

Abstract: A scissor suspension includes a first arm having a first end and a second end. The first end may be configured for pivotal attachment to a structure and a first bearing may be pivotally connected proximate to the second end of the first arm. A second arm having a first end and a second end may be pivotally connected to the first arm between the first and second ends of the first and second arms. The first bearing may be moveably coupled to the first rail.

Abstract: Forces are minimized in an object supported relative to a surface by providing a first, preferably static force sufficient to retain the object is position when at rest, preferably through a clamping arrangement having a first actuator, measuring or predicting an acceleration and applying a second, preferably dynamic force corresponding to the acceleration. The first and second forces are preferably arranged to be additive or reinforcing but the arrangement can be made fail-safe at the expense of increased power consumption by arranging the first force in accordance with the maximum anticipated acceleration and counteracting the first force with the second force for lesser or zero accelerations. The second force is preferably provided by a clamp of arbitrary configuration which can be moved into and out of engagement with the object. By minimizing forces applied to the object in such a manner, damage such as creep and propagation of crystal lattice dislocations over time can largely be prevented.

Abstract: An active vibration suppression apparatus includes a rotating actuator which is fixed to a vibration suppression target and generates a torque in a rotational direction, an inertial load which is connected to the actuator and moves in the rotational direction relative to the vibration suppression target in accordance with a torque of the actuator, and a driving circuit for generating a driving command signal for controlling the inertial load and driving the rotating actuator in accordance with the driving command signal. The rotating actuator rotates/drives the inertial load with a generated torque, and reduces vibrations produced in the vibration suppression target by applying a drive reaction force generated upon rotating/driving the inertial load as a control torque to the vibration suppression target.

Abstract: A gimbal system. The gimbal system may include space-saving features configured to accommodate one or more payload components, thus increasing the payload capacity of the gimbal ball without necessarily increasing the outer dimensions of the gimbal ball. Alternatively, or in addition, the gimbal system may include a motor configured to move at least one gimbal relative to another gimbal about a first axis, with the motor peripherally mounted distal the axis.

Abstract: Setting foot provided with a base and a carrier of which the level can be set with respect to the base by means of a lifting mechanism, in which the base is provided with an axial cylindrical opening having a diameter with internal screw thread, whereas the cylindrical carrier is provided with an external screw thread which cooperates with the internal screw thread of the carrier for the axial setting of the carrier, provided with a lifting mechanism, characterized in that, the coupling device comprises:—a setting bolt with an external screw thread and an outer diameter, and a coupling device between the setting bolt and the carrier;—a hollow (10) along a substantial part of the length of the setting bolt;—a coupling member between the hollow (10) and the setting bolt (13).

Abstract: A vehicle suspension system is designed such that its equation of motion can be decoupled. Such a suspension system is provided with actuators, and the actuators are optimally controlled to reduce vibration of the suspension system.

Abstract: An active control type mounting bushing device adapted to properly change the hardness of the mounting bushing according to a driving state, thereby obtaining a proper hardness of the mounting bushing for obtaining a comfortable ride during normal driving conditions, and reducing the inclination of the vehicle during the steering, and contributing to an excellent vehicle ride and steering at all times.

Abstract: A vibration isolation device for isolating a vibration source from a carried member, includes: a carrier for carrying the carried member; a housing positioned on the vibration source, and formed with an accommodating space; a cover for sealing an open end of the housing; a base mounted in the accommodating space, and extended through the cover to be connected to the carrier; a plurality of connecting members mounted in the accommodating space and around the base, wherein each of the connecting members is connected to the base and the cover; and a plurality of actuators provided in the connecting members respectively, for changing vibration of the connecting members and the base when the vibration source vibrates, so as to minimize vibration of the carrier, thereby achieving the effect of isolating vertical and horizontal vibrations.

Abstract: A method and system for calculating a control function for a structural system (10) that can be used to determine an appropriate control force to apply to an active member (18) within a stationary member (12) on the structural system (10). An active member (18) and a stationary member (12) are defined as a two-mass system in which the active member (18) and the stationary member (12) move in opposite directions. The stationary member (12) is mounted to an isolation subsystem (14) that is composed of six isolators (28) at multiple degrees of freedom. The isolation subsystem (14) is softer than the stationary member (12), active member (18) and a spacecraft surface (16) due to a damping element (32) of the isolation subsystem (16). The isolation subsystem (16) is mounted to the spacecraft (16) and decouples the spacecraft (16) from the stationary member (12) and thus the active member (18). An accurate control force for the active member (18) can be determined based upon the above structure (10).

Abstract: In order to control an internal pressure of an air spring appropriately without being influenced by a change in supply pressure, an anti-vibration system includes an air spring as an actuator for an anti-vibration table, a pressure control valve for controlling the internal pressure of the air spring, a pressure sensor for detecting the air supply pressure to the pressure control valve, a driving system for actuating the pressure control valve in accordance with a detection signal of the pressure sensor, and a variable gain compensation system for performing variable gain compensation to an input signal to the driving system for the pressure control valve, on the basis of the detection signal of the pressure sensor.

Abstract: An active vibration suppression apparatus includes an actuator fixed to a vibration suppression target, an inertial load driven relative to the target by the actuator, and a driving system which drives the actuator based on a first signal corresponding to the vibration, generated or to be generated, of the target. The driving system includes a compensation unit which performs a compensation for the first signal. The compensation, separately or as a composite compensation includes (i) a linear compensation for the first signal to obtain a first compensated signal, and (ii) a nonlinear compensation for the first compensated signal to obtain a second compensated signal. A rate of a change in the second compensated signal to a change in an absolute value of the first compensated signal becoming less with an increase of the absolute value.

Abstract: A drawer device or container holder includes a member disposed in a closed position to be able to draw into an open position, a driving device attached to the member to move the member between the closed position and the open position, and a sensing device for sensing whether or not the member is drawn out for a predetermined amount from the closed position. A control device controls the driving device to cause the member to be housed when the sensing device senses that the member is not drawn out for a predetermined amount. Also, a container placed on a tray can be sensed assuredly regardless of vibration during a movement of a vehicle.

Abstract: A lithographic apparatus includes a projection system mounted on a reference frame, which in turn is mounted on a base which supports the apparatus. Vibrations and displacement errors in the base are filtered through two sets of isolation mounts operatively between the base and reference frame and between the reference frame and a projection frame of the projection system and therefore disturbance of the projection system is reduced.

Abstract: An active suspension system is used to control the motion of a passenger seat in a high speed watercraft. A forward looking wave sensor is used in connection with a feed-forward wave impact shock predictor to determine characteristics of impending dynamic forces applied via the impact of the watercraft on waves. Information concerning the impending dynamic forces is used by a passenger seat suspension and control system to attenuate the shock effects on passengers, where such effects are characterized by large-amplitude, short-duration accelerations recurring at a low frequency and/or irregularly.

Abstract: A method for the diagnosis of natural vibrations in a mechatronic system, includes at least one rigid body (WT1, WT2), which is moved relative to another rigid body (S) by means of at least one numerically-controlled drive, whereby the natural vibrations are caused by the drive (A1, A2) and are detected by sensors (WM1, WM2, N1, N2, BA1, BA2,) internal or external to the system. The drives (A1, A2) can be used as a system-internal, vibration-generator, so-called rotatory shakers, by superimposing white noise on a constant speed for the drive, or by wobbling the frequencies.

Abstract: The invention proposes to address the vibration transfer function transmitted by a turbo-fan engine or equivalent to the aircraft structure, with two types of isolators mounted on a unique assembly but with a different physical response to the transfer function, an absorbing one and a resonating one. The difference in nature of such responses induces a non-interaction effect between the two isolators. The invention concerns more specifically a two-tone isolator assembly adapted to be mounted on an aircraft or equivalent comprising in particular a head, a cabin yoke and a power engine structure having a longitudinal axis crossed by a radial plan. The two-tone isolator assembly comprises, located at the head side of the aircraft, at least one support for, at least, one fluid mount isolator and two dynamic absorbers, and mechanical means to couple said support to the power engine structure and to the cabin yoke.

Abstract: The invention provides a dynamic beater comprising a spring-mass unit, said unit having a mass M and a stiffness K actuated by a drive motor and presenting a device for coupling to a host structure for damping, the beater presenting a first acceleration sensor secured to said mass and delivering a first signal s1, and a second acceleration sensor for mounting on the host structure and delivering a second signal s2, and also having a power amplifier supplying an output signal for controlling the drive motor in response to an input signal E which is a function of a difference between the signals from the first and second acceleration sensors after passing at least one of said signals through at least one lowpass filter and/or phase delay type filter.

Abstract: A suspension for a seat that varies the preload, spring rate and damping rate of the suspension in direct proportion to the suspended weight of an occupant of the seat to provide the same effective vibration isolation for any occupant. The suspension includes an actuating mechanism engaged with a first spring and a pivotal transfer link that is engaged with a second spring and a non-adjustable rate damper that are each fixedly attached to the seat opposite the transfer link. The transfer link is engaged with a weight adjustment mechanism which operates to adjust the position of a pivot pin for the transfer link with respect to the transfer link, such that the preload, spring rate and damping rate of the suspension are adjusted in proportion to the weight of the occupant of the seat to provide similar ride dynamics to any occupant of the seat.

Abstract: A suspension system supports a seat with respect to a base mounted on a frame of a vehicle. The system includes a hydraulic actuator coupled between the seat and the base. A single accelerometer is attached to the base and generates a base acceleration signal in response to motion of the base. A control unit actively controls the hydraulic actuator as a function of the base acceleration signal. The control unit generates a base velocity signal by integrating the base acceleration signal, generates a seat position signal representing a position of the seat relative to the base, generates a seat position error signal representing a difference between a desired position and the seat position signal, and generates a command signal as a function of the velocity signal and of the position error signal. The control unit controls the actuator by applying the command signal thereto.