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Measurement of Force, Torque, and other
Variables
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Measurement of Force, Torque,
and Other Mechanical Variables With Strain
Gages
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(...continued)
Although this discussion is primarily restricted to static load considerations, it should be evident that the cantilever beam, because of its mass and compliance, tends to exhibit a low natural frequency. Another (and related) disadvantage of the cantilever beam configuration is that it can lead to impracticably bulky and massive spring elements for large rated loads.
Bending beam spring element configurations are not limited, of course, to cantilever beams. A centrally loaded, simply supported beam, for example, of the same overall beam dimensions, and at the same maximum strain level, is nominally four times as stiff as the cantilever. For still lower compliance, the beam can be rigidly built-in at both ends to prevent end rotation and induce two reversals of curvature along the beam length. For corresponding beam geometries and maximum strain levels, the built-in beam is about eight times as stiff as the cantilever. These and the many other beam configurations found in commercial transducers are not discussed further, since the design details necessary for satisfactory transducer operation are beyond the scope of this article.( Ref. l )
Page 20 of 46
Although this discussion is primarily restricted to static load considerations, it should be evident that the cantilever beam, because of its mass and compliance, tends to exhibit a low natural frequency. Another (and related) disadvantage of the cantilever beam configuration is that it can lead to impracticably bulky and massive spring elements for large rated loads.
Bending beam spring element configurations are not limited, of course, to cantilever beams. A centrally loaded, simply supported beam, for example, of the same overall beam dimensions, and at the same maximum strain level, is nominally four times as stiff as the cantilever. For still lower compliance, the beam can be rigidly built-in at both ends to prevent end rotation and induce two reversals of curvature along the beam length. For corresponding beam geometries and maximum strain levels, the built-in beam is about eight times as stiff as the cantilever. These and the many other beam configurations found in commercial transducers are not discussed further, since the design details necessary for satisfactory transducer operation are beyond the scope of this article.( Ref. l )
Page 20 of 46