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An electronic throttle control pedal pivotally couples a lever arm to a pedal beam and biases the beam for resisting an applying force to the pedal beam and for biasing sliding surfaces together in frictional contact. A compression spring carried between a mounting bracket and the lever arm biases t

An electronic throttle control pedal pivotally couples a lever arm to a pedal beam and biases the beam for resisting an applying force to the pedal beam and for biasing sliding surfaces together in frictional contact. A compression spring carried between a mounting bracket and the lever arm biases the pedal beam toward an idle position while at the same time causing a frictional force between the frictional surfaces, such that displacing the pedal beam with an applying force compresses the spring which increases a frictional force between the friction surfaces with an increasing displacement of the pedal beam distal end, and reducing the displacement through a retracting force on the pedal beam distal end expands the compression spring and returns the pedal beam to the idle position through a hysteresis force response for the pedal beam displacement. The hysteresis can be tuned by modifying element dimensions of the pedal.

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An electronic throttle control pedal pivotally couples a lever arm to a pedal beam and biases the beam for resisting an applying force to the pedal beam and for biasing sliding surfaces together in frictional contact. A compression spring carried between a mounting bracket and the lever arm biases t

An electronic throttle control pedal pivotally couples a lever arm to a pedal beam and biases the beam for resisting an applying force to the pedal beam and for biasing sliding surfaces together in frictional contact. A compression spring carried between a mounting bracket and the lever arm biases the pedal beam toward an idle position while at the same time causing a frictional force between the frictional surfaces, such that displacing the pedal beam with an applying force compresses the spring which increases a frictional force between the friction surfaces with an increasing displacement of the pedal beam distal end, and reducing the displacement through a retracting force on the pedal beam distal end expands the compression spring and returns the pedal beam to the idle position through a hysteresis force response for the pedal beam displacement. The hysteresis can be tuned by modifying element dimensions of the pedal. m Industry Inspection," Proceedings Petroleum Industry Inspection Technology, Topical, Jun. 1989, pp. 157-161, American Society for Nondestructive Testing, Houston, TX. Bray, D.E., Leon-Salamanca, T., and Junghans, P., "Applications of the LCR Ultrasonic Technique for Evaluating Post Weld Heat Treatment in Steel Plate," in Streit, R., ed., Nondestructive Evaluation NDE Planning and Application, NDE 5, Jul. 1989, pp. 191-197, Proceedings 1989 Pressure Vessels and Piping Conference, Honolulu, HI. Leon-Salamanca, T., Reinhart, E., Bray, D.E., and Golis, M., "Field Applications of an Ultrasonic Method for Stress Measurement in Structure," Apr. 1989, pp. 1484-1489, Boogaard, J. and Van Dijk, G., eds., Nondestructive Testing (Proceedings 12th World Conference), Amsterdam, The Netherlands. Leon-Salamanca, T., and Bray, D.E., "Application of Ultrasonic P-Wave for Nondestructive Stress Measurement," Nov. 1985, Proceedings of the 11th World Conference on Nondestructive Testing, Las Vegas, NV. Leon-Salamanca, T., and Bray, D.E., "Mean Travel-time for Zero-Force Determination in Railroad Rails Using P-Waves," Apr. 1985, Proceedings of the 15th Symposium on NDE, San Antonio, TX. Bray, D.E. and Egle, D.M., "Field Tests on the Use of Ultrasonic Wave Velocity Changes to Detect Longitudinal Stress Variations in Railroad Rail," Conference on Nondestructive Techniques for Measuring the Longitudinal Force in Rails, Feb. 1979, FRA/ORD-80-50, Jun. 1980, Federal Railroad Administration/Association of American Railroad, Washington, D.C. Bray, D.E. and Egle, D.M., "Residual Stress Measurement in Railroad Rail," Proceedings of a Workshop in Nondestructive Evaluation of Residual Stress, NTIAC-76-2, 1975, pp. 187-195, Nondestructive Testing Information Analysis Center, San Antonio, TX. King, R.R., Birdwell, J.A., Clotfelter, W.N., Risch, E.R., and Bray, D.E., "Improved Methods for Nondestructive Measuring Residual Stress in Railway Wheels," Apr. 1973, pp. 91-105, Proceedings of the Ninth Symposium on NDE, San Antonio, TX. Bray, Don E., "Fixing the Impedance Mismatch in Engineerin