Measurement of Stiffness and Damping Characteristics of Computer Keyboard Keys
Document Type
Article
Publication Date
6-2005
Source Publication
Journal of Dynamic Systems, Measurement, and Control
Source ISSN
0022-0434
Abstract
To determine the stiffness and damping of computer keyboard keys, a computer-controlled test rig that can measure computer key displacement, velocity, and contact force has been designed. The test rig, consisting of a single-axis stage carrying a probe for contacting keys, has been used to collect contact force and motion data as computer keys are depressed and released at constant velocities up to 80mm∕s . Keys that employ a rubber-dome under their caps to achieve the necessary compliance and toggling action were tested. The results demonstrate a nonlinear stiffness force versus displacement characteristic at a given speed and the presence of damping-type forces that increase with key depression speed at a given displacement. In particular, the results indicate that the peak force at the 80mm∕s rate of depression increases relative to the quasistatic (0.5mm∕s) force level by over 12% for the “Enter,” “K,” and “Spacebar” keys. This paper describes the hardware and software configuration, and presents sample results of the stiffness and damping characteristics of keys during depression-return stroke tests.
Recommended Citation
Nagurka, Mark L. and Marklin, Richard W. Jr., "Measurement of Stiffness and Damping Characteristics of Computer Keyboard Keys" (2005). Mechanical Engineering Faculty Research and Publications. 26.
https://epublications.marquette.edu/mechengin_fac/26
Comments
Journal of Dynamic Systems, Measurement, and Control, Vol. 127, No. 2 (June 2005): 283-288. DOI.