Advanced Mechanical Technology, Inc.

Albert C Drueding

Gary M Glass

Forest J Carignan

Bruce F White

Fred Ruland

Jonathan Taylor

A method of timing data sampling includes, in a data acquisition device, generating sampling intervals from a system clock of the data acquisition device, sampling data at the generated sampling intervals, and receiving start of frame (SOF) signals from a port, such as a USB port. For a selected number of SOF signals received, an actual number of system clock cycles is determined for a time interval corresponding to the selected number of SOF signals. The actual number of system clock cycles is compared to a nominal number of system clock cycles and a sampling interval is adjusted based on the comparison. The actual number of system clock cycles may be determined using a count-and-capture counter. The nominal number of system clock cycles may be calculated based on a nominal system clock rate and on a known SOF interval. Generating sampling intervals may include using a divide-by-N counter.

Data acquisition device and method of timing data sampling

A method of processing force signals from plural force platforms includes, in a computer, in an initialization process, receiving data distinguishing the plural platforms, monitoring force data signals from each of the plural platforms, and identifying each of the plural platforms to a force platform data process application by a sequence of received above-threshold force data signals. The method further includes, subsequent to the initialization process, processing subsequent force data signals according to the identification of each of the plural force platforms. The distinguishing data can include data retrieved from nonvolatile memory of each of the plural force platforms, such as a platform serial number, calibration data, and force platform capacity. A force platform system includes one or more force platforms and force platform signal conditioning circuitry connected to the one or more force platforms. The signal conditioning circuitry may include a separate signal conditioner connected to each force platform.

Method and system for simultaneously starting actions of devices

A method for calibrating a force platform includes, providing a force platform and applying an n&#xd7;m grid on a top surface of the force platform via a computing device. Next, applying p known loads on each of the n&#xd7;m grid points of the top surface along a Z-axis being perpendicular to the X and Y axes and along the X and Y axes. Next, taking multipoint measurements at each grid point and for each applied known load along the X, Y and Z axes and generating six measured output signals, exact position coordinates and applied known load magnitude for each grid point. Next, assembling an array of n&#xd7;m&#xd7;p of six equations with six unknown for each grid point and applied known load and then solving the assembled equations and deriving a position and load specific calibration matrix for each grid point.

System and method for three dimensional calibration of force plates

A method of processing force signals from plural force platforms includes, in a computer, in an initialization process, receiving data distinguishing the plural platforms, monitoring force data signals from each of the plural platforms, and identifying each of the plural platforms to a force platform data process application by a sequence of received above-threshold force data signals. The method further includes, subsequent to the initialization process, processing subsequent force data signals according to the identification of each of the plural force platforms. The distinguishing data can include data retrieved from nonvolatile memory of each of the plural force platforms, such as a platform serial number, calibration data, and platform capacity. A force platform system includes one or more force platforms and force platform signal conditioning circuitry connected to the one or more force platforms. The signal conditioning circuitry may include a separate signal conditioner connected to each force platform.

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Belmont, MA, United States of America

Albert C Drueding