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S2 Bioengenharia e Qualidade de Vida |
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Title:
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DESENVOLVIMENTO DE CÉLULA DE CARGA PARA MEDIR FORÇA APLICADA SOBRE TECLA DURANTE DIGITAÇÃO
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Summary :
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ABSTRACT. THIS WORK DESCRIBES THE DEVELOPMENT OF A LOAD CELL (WITH STRAIN GAGES) FOR KEYBOARD. THIS LOAD CELL CONSISTS OF 4 BARS. A STRAIN GAGE IS BONDED AT THE UPPER FACE (TENSION) OF ONE BAR AND ONE STRAIN GAGE IS BONDED SIMECTRICALLY (COMPRESSION) AT ANOTHER BAR; THE SAME IS DONE WITH THE OTHER TWO BARS. THESE STRAIN GAGES ARE CONNECTED TO A BRIDGE AMPLIFIER (FULL BRIDGE, PROVIDING TEMPERATURE COMPENSATION). IF A FORCE IS APPLIED AT THE CENTER OF THE KEY, EACH BAR WILL SUFFER THE SAME DEFORMATION; IF THE SAME FORCE IS APPLIED AT A CORNER OF THE KEY, THE DEFORMATIONS AT THE BARS WILL NOT BE EQUAL, BUT THE TOTAL DEFORMATION WILL BE THE SAME OF THE FIRST CASE, PROVIDING THE SAME OUTPUT SIGNAL.
KEYWORDS: DIGITIZER, DYNAMOMETRY, FORCE, KEYBOARD, DIGITZER, TYPEWRITER. |
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Author :
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Gertz, Luiz Carlos 0
Thomas, Carlos A. Kern
Zaro, Milton Antônio
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Paper View :
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