Abstract: A ride simulator for use with a children's ride-on vehicle. The simulator includes a base, and a mechanism for removably securing to at least one of the wheels of an independently operable children's ride-on vehicle. The mechanism includes a fastener that selectively engages a mount on the wheel to support the wheel and at least a portion of the vehicle above the base. Driven rotation of the wheel to which the fastener is engaged causes reciprocating horizontal and vertical motion of the vehicle with respect to the base, thereby simulating ground-traveling movement of the vehicle.

Abstract: A visual display system for producing a continuous far-focused virtual image according to the present invention includes a number of adjacent video image generation and display modules. Each module includes an image generator that generates a video image representative of a portion of a composite display image displayed on a video display. The visual display system also includes a number of optical viewing lenses associated with each video image generation and display modules and positioned between the operator and the video display. The lenses restrict the operator's field of view such that the operator views only a portion of the active display area of the video displays. The lenses of adjacent modules are joined together along their edges to form an enclosure partially surrounding the operator so that the operator views the composite display image displayed on the video displays through the lenses and perceives the composite display image as a continuous far-focused virtual image.

Abstract: A locomotion platform is composed of a platform main body, a waist holding device, a signal fetching circuit, and a monitoring system. The platform main body consists of a platform structure body, a perforated platform face plate, position sensors, and balls located over the position sensors. The waist holding device consists of a waist ring for catching the waist of a user, and a fastening member for fastening the waist holding device with the platform structure body. The signal fetching circuit is intended to fetch the signals generated by the position sensors. The monitoring system is intended to receive the output signals of the signal fetching circuit and is provided with a software for computing the displacement generated by the strolling of the user on the platform main body. The results of computation are exhibited on a monitor.

Abstract: A display device is provided with a center unit 10 having a center display unit 12, a slave unit 20 having a slave display unit 21 and a communication line for communicatively connecting the center unit 10 and the slave unit 20. When the center control microcomputer 15 of the center unit 10 detects a predetermined operation through a key operating unit 14, the center control microcomputer 15 and the slave control microcomputer 24 make two of the center display unit 12 and the slave display unit 21 provide a linking display as if these display units operate as one display unit.

Abstract: A device to connect a control panel of an avionics equipment with a training and simulation apparatus to process and display signals that correspond to output signals of the control panel. The device includes means coupled to a keyboard of the control panel for decoding signals from the control panel keyboard and means coupled to the means for decoding the keyboard signals to convert the keyboard signals into computer keyboard signals. The device additionally includes adaptor means to provide the computer keyboard signals to the computer.

Abstract: A modular, reconfigurable and easily deployable simulator system includes a plurality of vehicle personality kits and at least one frame to support a single crewstation. Members of a selected kit are coupled to the frame. A multi-platform control system provides on-the-window and in vehicle instrument displays in real-time in response to the crewperson manipulating platform controls. An editor with a graphical user interface provides a capability to modify program segments of the control system thereby altering the behavior of the simulated platform.

Abstract: A new interactive simulator ride for providing an entertaining interactive visual, audio, and motion simulation. The inventive device includes a guidance track comprised of a plurality of laterally spaced guidance rails, a simulator vehicle housing having an interior and having lateral side walls having a plurality of support wheels mounted thereon for supporting the simulator vehicle housing on the spaced guidance rails. A seat for seating by a person is provided within the interior of the simulator vehicle housing. A viewing screen is provided within the simulator vehicle housing interior for providing a computer generated visual image for viewing by a person located in the simulator housing. The invention also includes a projection means for projecting a computer generated visual image on the viewing screen, a means for providing computer generated visual images to the projection means, and a user input device.

Abstract: A system for flight training and simulation that reduces the time spent by a student or pilot inside the simulation cockpit in programming navigation systems. The system comprises a simulation workstation that interfaces with one or more automated navigational devices inside the cockpit. From the workstation the student enters and stores a flight plan and other flight conditions which are communicated to the automated navigational devices during training. A frame relay device redirects data flow inside the cockpit from the onboard aircraft communications and reporting system to the simulation workstation. The simulation workstation contains a flight data interface board that is configured to communicate with the automated navigational devices. The board contains a transmitter/receiver chip set that supports known avionics communications protocols for data transfers with the automated navigational devices inside the cockpit.

Abstract: The disclosed motion device comprises a triangular platform supporting a load, for example a simulator cabin. This platform is supported at all three corners by hinged arms driven by cranks that are moved by an actuator. There is provided a load compensation device facilitating the work of the actuators. Thus the load can be moved in pitch and roll as well as vertically.

Abstract: A trainer for teaching the operation of aircraft fuel systems comprised of a fuselage frame portion and fuel tanks mounted to a platform. The trainer utilizes a fuel look-alike with a viscosity below 2.8 cs and a flashpoint above 200.degree. F.

Abstract: A method for tutoring a trainee in a simulator comprises the steps of defining an expert system simulating an activity, and using the expert system to provide instructional feedback to the trainee. The step of defining an expert system comprises constructing a decision support system so as to define a human factors engineering module, programming a plurality of training scenarios, and establishing automated performance measures. The method for tutoring of the present invention eliminates the need to have an expert trainer available and the consequent expense associated therewith.

Abstract: A control system for a motion simulator and the associated method of operating the motion simulator. The control system contains a memory. Within the memory is a plurality of pre-programmed maneuvers that are capable of being simulated by the motion simulator. An interface is provided that enables a person to select some of the pre-programmed maneuvers from the memory in a desired sequence, prior to that person entering the motion simulator. Once a certain sequence of maneuvers is selected, the motion simulator simulates those maneuvers in the chosen sequence. This enables each rider of the motion simulator to design his/her own simulation each time that person uses the motion simulator. The control system also enables a rider to program the motion simulator at the sight of the motion simulator or at home, via a personal computer.

Abstract: A video display system for a mobile simulator, comprising a shock-isolated projector assembly for projecting video images, a shock-isolated first mirror assembly disposed in combination with the projector assembly, a shock-isolated second mirror assembly disposed in combination with the first mirror assembly, and a shock-isolated screen assembly disposed in combination with the second mirror assembly, wherein the projector assembly, the first mirror assembly, the second mirror assembly, and the screen assembly are configured, in combination, such that the video images projected by the projector assembly are directed to the first mirror assembly, are reflected from the first mirror assembly to the second mirror assembly, and are subsequently reflected from the second mirror assembly onto the screen assembly.

Abstract: A training aid providing a display simulating that of an artificial horizon instrument. The training aid comprises a base, a circular member rotatably supported within the base, and a horizon indicating member. The circular member is transparent and has an image representative of an aircraft and a pointer inscribed on the circular member. The horizon indicating member has a symbolic horizon inscribed thereon, and is visible through the circular member. The base has index marks forming a scale visible through the circular member. The horizon indicating member is linearly movable relative to the base, and may be manipulated so that the symbolic horizon is visible in positions indicative of climbing, diving, and level flight. The circular member may be rotated to indicate banking to the right and left and straight flight. The circular member and horizon indicating member are independently manipulable so that any flight attitude attainable in actual flight can be symbolically reproduced on the training aid.

Abstract: An entertainment device is based on a sphere that moves in coordination with visual and auditory stimuli. Audience members are seated inside the sphere in one hemisphere while an image is displayed on the inside of the opposite hemisphere. The sphere is driven by actuators to roll, pitch and yaw without limit in synchrony with the images displayed. An audio system works in synchrony with the motion to further enhance the experience. Pure horizontal or vertical motion effects may be obtained by adding one or more linear motion stages which translate the entire sphere assembly horizontally or vertically. The audience members may interact with the ride using actuators. Multiple spheres may interact with each other.

Abstract: A virtual reality system provides effective exposure treatment for psychiatric patients suffering from a particular anxiety disorder. The system is characterized by a video screen disposed in front of the patient to display an image of a specific graphical environment that is intended to trigger anxiety within the patient as a result of the particular patient phobia. A headset is worn by the patient, and has sensors disposed to detect movement and positioning of the patient's head. A computer program controls the operation of the system, and is designed to control the display of the graphical environment on the video screen, monitor the headset sensors and determine the position of the patient's head, and controllably manipulate the graphical environment displayed on the video screen to reflect the movement and position of the patient's head.

Abstract: A realistic roller coaster simulator is disclosed having one or more passenger seats equipped with a safety harness and mounted for 360 degree rotational movement along at least two axes for simulating the motion of a roller coaster. A controller is provided for controlling and coordinating the motion of the simulator with a simulation controller which generates to the passenger synchronized audio and visual effects which would be experienced by a passenger on a roller coaster of a predetermined design. Linked to the simulator is a design station where a passenger can design his or her own roller coaster. Upon entering the simulator station, the passenger's design can be accessed from memory and selected for simulation on the simulator vehicle. Upon initiation of the simulation, the passenger can experience in real time the visual, motive, audible and other effects (such as wind, heat, cold, water, etc.) of the simulated roller coaster ride which the passenger has designed.

Abstract: A fixed or portable multi-functional enclosure that is card-operated, climate controlled, and provides a quiet work place for use by students or businessmen. The enclosure has a generally semi-oval shaped housing comprising a front portion including a front cowling, a central portion with a curved door, and a rear portion with a lower section and a rear lid. The enclosure housing includes three magnetic card readers located on the opaque front cowling, the curved door, and the rear lid. The central portion includes an ergonomically designed seat or chair and a curved console containing a computer monitor. The ergonomically designed seat or chair is tiltable and is dimensionally adjustable up, down, forward, and backward. The console includes a fiber optic camera, a computer monitor, a computer printer, a modem, a facsimile machine, and a phone speaker. Positioned on the console are connection ports for a VOX head phone set and a virtual reality head set.

Abstract: The invention provides a motion simulating device which provides the user with full freedom of motion. Ideally, the motion is coordinated with the user's senses. The motion simulating device may include a generally spherical capsule supported by a number of rollers, at least one of which is a multi-directional active roller which frictionally engages the spherical capsule. This causes the spherical capsule to rotate in any desired direction. The capsule may have mounted within it an interactive solid, which may take the form of an omni-directional treadmill for supporting the user.

Abstract: A new motion cueing scheme has been found and adapted to an actual aircraft production seat to provide both transient and sustained heave acceleration cues. The mechanism is simple and compact enough to be easily implemented on G-seats. Changes in seat pan pitch angle synchronized with seat back vertical displacement result in a cue which feels realistic and reproduces consistently a number of the physiological and physical effects experienced by the pilot submitted to a real heave acceleration.

Abstract: A motion simulator comprises a deck supported by a number of length-adjustable legs. The legs are connected to a baseplate which is, in turn, supported by a number of swivel arms which support the baseplate relative to a ground plate. The configuration of legs and swivel arms allows the deck five degree of freedom relative to the baseplate.

Abstract: A simulator includes a base plate, a platform, a plurality of actuators, each of the actuators having a hydraulic cylinder, a sensor, a servo valve and a pair of universal joints, and a weight supporting actuator including a pressure sensor and designed to support a specific weight of the platform and the substance thereon. The sensors and the pressure sensor sense the variation of length and weight imposed on each of the hydraulic cylinders, respectively. The servo valve selectively passes a high pressure fluid to an upper and a lower portions of the cylinder and the pair of universal joints have a three degrees of freedom to allow the platform to have six degrees of freedom. A controller controls the servo valve of both actuators to vary the length of each of the hydraulic cylinders thereof, thereby lessening the load imposed on the actuators.

Abstract: A ride simulator for use with a children's ride-on vehicle. The simulator includes a stationary base, a first support structure extending upwardly from the base for supporting at least a portion of the vehicle above the base, and an actuator for coupling to the vehicle to effect reciprocating horizontal and vertical motion of the vehicle about a defined location on the simulator, thereby simulating ground-traveling movement of the vehicle.

Abstract: A simulator system for providing a realistic simulation of a racecar. The simulator systems provides a driver with substantially the same visual and auditory stimuli as would a real racecar. The physical forces experienced by the driver include steering wheel movement, chassis movement and large changes in vertical, horizontal and lateral G forces as the racecar corners around turns on sloped racetrack embankments. Since the simulator accurately simulated the forces experienced when driving a real racecar, the present invention simulator can be used to physically train drivers as well as mentally train drivers. Prior to a simulation, a driver selects a type of racecar. Every adjustable feature of the racecar selected that is capable of effecting the driving performance of the racecar is given a default value that the driver may change. As a result, the performance of the simulated racecar can be selectively adjusted to match that of a real racecar for which the driver is accustomed.

Abstract: An interactive, vehicle simulator system receives input signals indicative of actions of a user who is located in a driver module. The simulator system also displays images and moves the driver module in accordance with the input signals. The simulator system comprises an input device for generating the input signals, an image generator, an image presentation apparatus, a motion base, a motion base controller and a game controller.The image generator receives signals indicative of a first set of processed, pre-recorded digital images, and generates signals indicative of a second set of digital images. The second set of digital images is indicative of a select number of the first set of processed, pre-recorded digital images as seen from a desired viewpoint which has a desired velocity. The image presentation apparatus receives the signals indicative of the second set of digital images and generates in dependence thereupon the second set of digital images, which it presents to the user.

Abstract: A dual axis mechanically actuated motion platform which allows a user to move him or herself through a wide range of angular displacement in two intersecting axes individually or simultaneously by apply manual pressure to a lever in the direction of desired angular displacement. The motion platform is comprised of a base frame, a user support platform mounted on top of a universal joint, and a bearing mounted, preloaded offset linkage system coupled to a joystick lever. The offset linkage system creates enough increased mechanical advantage to move the seat platform in concert with the movement of the joystick lever, providing the user with the feeling of controlling an aircraft and the attendant sensations of pitch and roll motion.

Abstract: A mobile modular simulator system comprising a mobile base, a multimedia subsystem module demountably coupled with the mobile base, and a controller subsystem module demountably coupled with the mobile base, wherein the controller subsystem is configured for electronic coupling with the multimedia subsystem module for receiving input therefrom and for delivering output thereto to simulate an operating environment.

Abstract: A mechanically actuated motion platform which provides a realistic simulation of the side to side motion experienced while operating a vehicle which is normally steered at its front end. The motion platform is comprised of a base frame coupled through a pivot to a second frame which carries a steering assembly and a operator seat. The steering assembly is coupled though a means for conveying rotational energy to an axle shaft which uses a traction wheel fixedly connected to the axle shaft to effect substantially horizontal movement of the second frame when rotational force is applied to the steering shaft. Also provided is a tiltable operator seat which acts in concert with a spring loaded throttle pedal to impart sensations of acceleration and deceleration to the user.

Abstract: A simulator, example, a flight simulator, includng an image-generating display (20) and first and second mirrors (30, 40). The mirrors (30, 40) are singly curved and have substantially perpendicular axes, so that light from the display passes to the the concave surface of the first mirror (30), and from that mirror (30) to the concave surface of the second mirror (40), and from the second mirror (40) to a user of the simulator.

Abstract: A computer simulator for vehicles such as racing cars in which there is a steering mechanism which has an elastomeric flexible coupling (10) between the steering wheel (1) and the computer control mechanism which controls the action of the simulated vehicle on a video display unit so that the steering wheel has the feel of the actual vehicle, preferably there are gear change levers (16) forming part of the steering wheel (1) and foot pedals (22) and sound simulators which are interactive with the computer to enhance the simulation.

Abstract: A reactive ride simulator includes package of sensors along with a telemetry radio transmitter and/or a recorder. This package is carried at a movable remote site, such as aboard an actual vehicle. A radio receiver, or a player for the recorded data from the remote site, is interfaced with a decoder providing a electronic signals which include a replication of the sights, sounds, and motions experienced at the remote site. A motion base is used to provide the accelerations necessary to replicate the G-forces experienced at the remote site, while a cabin on this motion base is associated with audio/visual presentation devices so that a passenger on the reactive ride simulator also receives the audio/visual sensations of being present at the remote site. As a result, the passenger on the reactive ride simulator receives a sensory experience of being at the remote site, or of riding on the actual vehicle, while actually moving only slightly on the motion base.

Abstract: An intermodal transportation simulation system comprising a ground transportation simulation node, a rail transportation simulation node, a maritime transportation simulation node and an air transportation simulation node. Each of these simulation nodes are interactive, interconnected and designed to provide a manned multi-sensory, e.g. visual, auditory, olfactory and tactile simulation.

Abstract: Disclosed is a simulator includes a substantially circular outer frame pivotally mounted on a base; an outer frame-driving tire which is pressed against an outer side of the outer frame by means of a spring disposed on the base and is adapted to drive the outer frame, an inner frase formed in a maneuvering seat and pivotally supported between opposing portions of an inner peripheral wall of the outer frame; and an inner frame-driving tire which is pressed against an inner side of the outer frame by means of a spring disposed within the inner frame and is adapted to drive the inner frame. Also disclosed is an occupant holding apparatus for use in the simulator.

Abstract: The present invention provides a turbulence model that has been developed for blade-element helicopter simulation. This model uses an innovative temporal and geometrical distribution algorithm that preserves the statistical characteristics of the turbulence spectra over the rotor disc, while providing velocity components in real time to each of five blade-element stations along each of four blades, for a total of twenty blade-element stations. The simulator system includes a software implementation of flight dynamics that adheres to the guidelines for turbulence set forth in military specifications. One of the features of the present simulator system is that it applies simulated turbulence to the rotor blades of the helicopter, rather than to its center of gravity. The simulator system accurately models the rotor penetration into a gust field. It includes time correlation between the front and rear of the main rotor, as well as between the side forces felt at the center of gravity and at the tail rotor.

Abstract: A control system for a motion simulator and the associated method of operating the motion simulator. The control system contains a memory. Within the memory is a plurality of pre-programmed maneuvers that are capable of being simulated by the motion simulator. An interface is provided that enables a person to select some of the pre-programmed maneuvers from the memory in a desired sequence, prior to that person entering the motion simulator. Once a certain sequence of maneuvers is selected, the motion simulator simulates those maneuvers in the chosen sequence. This enables each rider of the motion simulator to design his/her own simulation each time that person uses the motion simulator. The control system also enables a rider to program the motion simulator at the sight of the motion simulator or at home, via a personal computer.

Abstract: A device for training a person to ride a unicycle including a base for making contact with a floor or ground, two hand rails mounted on the base, and two support rods mounted uprightly on the base such that the two support rods are located between the two hand rails, and that the two support rods are separated from each other by a distance corresponding to the distance between two knobs of the fork tube of the unicycle. The two support rods are provided respectively at the top end thereof with a locating seat having a locating slot for receiving one of the two knobs of the fork tube of the unicycle such that the unicycle can be caused by the rider to engage in a rocking motion.

Abstract: A virtual reality system provides effective exposure treatment for psychiatric patients suffering from a particular anxiety disorder. The system is characterized by a video screen disposed in front of the patient to display an image of a specific graphical environment that is intended to trigger anxiety within the patient as a result of the particular patient phobia. A headset is worn by the patient, and has sensors disposed to detect movement and positioning of the patient's head. A computer program controls the operation of the system, and is designed to control the display of the graphical environment on the video screen, monitor the headset sensors and determine the position of the patient's head, and controllably manipulate the graphical environment displayed on the video screen to reflect the movement and position of the patient's head.

Abstract: A system for simulating the forces associated with touching objects in a virtual reality simulator system includes a panel that contains an example of the various types of switches, knobs and any other item or object being simulated that is to be touched by a user of the system. The panel is attached as the payload of a robotic positioning device controlled by a computer. The computer is connected to a tracker and a flexible lightweight data glove worn by the user. The computer maintains a database that includes the positions of all of the controls being simulated by the system. The computer uses the trajectory data to determine the position of the robotic device.

Abstract: A manually operated motion device for user interactive motion of a motion surface. The motion device includes a motion surface with a support points in a substantially triangular arrangement and that are used to support the motion platform in a substantially parallel relationship to the floor by a pair of support members attached to universal hinges on the motion surface and a compression member which connects to a universal hinge on the motion surface and may move in a substantially vertical plane that bisects the triangular arrangement of the support points on the motion surface. Attached to the supports is at least one mechanism for manually moving at least one of the support members, so that motion of one support member allows motion of the motion surface.

Abstract: A realistic motion ride simulator comprising three stacked tiers pivotally supported by three legs. Each tier can be activated independent of each other while the entire apparatus is moved up and down, tilted laterally, pitched upwardly and downwardly and combinations thereof to simulate the various dynamic forces experienced by riders of a moving vehicle.

Abstract: A vehicle simulator including a system for development of vehicle simulation scenarios. The vehicle simulation system includes simulated vehicle controls providing input signals to a computer, and feedback devices, including a video display, providing a user with feedback on the operation and location of the simulated vehicle as it is driven through a simulated universe. One aspect of the invention is a scenario development system which uses the vehicle controls, the computer and the output devices to enable a scenario developer to develop a simulation scenario which includes other programmed vehicles. The scenario developer can determine when and where the other programmed vehicles become active in a simulated universe in which the scenario takes place, as well as determine when and where the programmed vehicles leave the simulated universe.

Abstract: A method and an apparatus for simulator control include a training system (10) with indicators and controls (12) for interfacing with a trainee. A display (16) is used to display representations of preprogrammed units, each unit including a collection of detailed parameters for use with a selected training scenario. Selection of one of the representations results in configuring the training system (10) according to the detailed parameters of the unit associated with the selected representation.

Abstract: A radio control transmitter capable of preventing a pupil-side radio control transmitter from outputting a radio wave even when a pupil-side operator erroneously closes a power switch of the pupil-side radio control transmitter. The transmitter includes a radio-frequency circuit for modulating a stick operation signal encoded by an encoder and outputting it in the form of a radio wave and a power control section for discriminating which of an internal power supply and an external power supply feeds a power thereto and holding a result of the discrimination therein. The power control section also functions to control switches for feeding the encoder and radio-frequency circuit with a power depending on the discrimination result. A trainer switch is arranged so as to permit a signal to be selectively applied to the radio-frequency circuit 5 from the encoder or a trainer cable.

Abstract: A driver training system for a user of a simulated vehicle. The system includes input devices for controlling the simulated vehicle, a video display having three dimensional graphics, a computer, modeling software for determining position information based on the input devices, atmospheric effects software to simulate time-of-day and weather conditions, and realistic operating feedback software for simulating on the input devices the feedback normally experienced with operating the vehicle. One aspect of the preferred embodiment is a system including a low frequency speaker mounted on an enclosure adjacent to the simulation user's seat through which road feel cues such as hitting an object are transmitted to the user in response to signals received from the computer. Another aspect of the invention is the a system for simulating the feel to the user of anti-lock brakes on a brake pedal in response to signals received the computer.

Abstract: A flight simulator kit which includes at least a simulated flight attitude control member, the simulated flight attitude control member being capable of mimicking the movements of an actual aircraft flight attitude control member. A visual display system is also provided for receiving input signals and in response thereto visually display a video simulation of a plurality of simulated aircraft flight instruments mimicking the movements and responses of actual aircraft flight instruments. The kit further includes a computer for receiving the output signals from the simulated control system and in response thereto for providing the input signals to the visual display system. The kit may be used to set up a simulator in an actual aircraft not in flight.

Abstract: A driver training system for a user of a simulated vehicle. The system includes input devices for controlling the simulated vehicle, a video display having three dimensional graphics, a computer, modeling software for determining position information based on the input devices, atmospheric effects software to simulate time-of-day and weather conditions, and realistic operating feedback software for simulating on the input devices the feedback normally experienced with operating the vehicle. One aspect of the preferred embodiment is a system including a low frequency speaker mounted on an enclosure adjacent to the simulation user's seat through which road feel cues such as hitting an object are transmitted to the user in response to signals received from the computer. Another aspect of the invention is the a system for simulating the feel to the user of anti-lock brakes on a brake pedal in response to signals received the computer.

Abstract: A method and apparatus for training are provided in which a training system (10) includes indicators and controls (12) for interfacing with a trainee. A display (16) is used to display graphical representations of operating conditions. By selecting locations on the display (16), the training system (10) is configured to correspond with the operating conditions associated with the selected locations on the-display (16).

Abstract: A vertical free fall system is proposed where a capsule with human beings is raised pneumatically in a tube, then is released to fall down in a free fall mode inside of the tube. The capsule has some means of controlling the air flow passing across the capsule so that the rate of deceleration is controlled. In this way the capsule is able to free fall then to be decelerated to the bottom of the tube. Also the tube has means to control the flowing air by this being possible to control the deceleration of the said capsule.

Abstract: A simulator system for use in providing an event simulation to a passenger includes an inverted motion base having six degrees of freedom. An audio-visual display mechanism is included for providing a sequence of audio and visual images to the passenger. A motion base controller generates actuator drive signals. A system controller provides the command signals to the motion base controller in synchronization with the presentation of the audio-visual images. The motion base is characterized by an passenger platform which is suspended from a series of spars. Motion is accomplished by means of displaceable actuators arranged in a substantially orthogonal relationship. The present system has compact dimensions and minimize loads impressed to the surrounding structure; thereby allowing the present system to be incorporated into existing commercial structures with minimal modification.

Abstract: A motion base for use in a simulator system is characterized by three degrees of freedom and improved compliance characteristics. The motion base has a plurality of nested perimeter frames, some of whose members attached by means of a motice and tenon design. Motion is accomplished by means of displaceable actuators arranged in a substantially orthogonal relationship with a vertical and one horizontal actuator mounted within the motion base perimeter. The actuators have either 2 DOF mounts or spherical bearings to allow for slight off axis motion relative to the frame member. The present system has compact dimensions and minimize loads impressed to motion base bearings; thereby allowing the present system to be incorporated into existing commercial structures with minimal modification.