Abstract
General load cells have typically constant sensitivity throughout the measurement range, which is acceptable for common force measurement systems. However, it is not adequate for high-performance control and high-stroke applications such as robotic systems. It is required to have a higher sensitivity in a small force range than that in a large force range. In contrast, for large loading force, it is more important to increase the measurement range than the sensitivity. To cope with these characteristics, the strain curve versus the force measurement should be derived as a logarithmic graph. To implement this nonlinear nature, the proposed load cell is composed of two mechanical components: an activator, which has a curved surface profile to translocate the contact point, and a linear torque measurement unit with a moment lever to measure the loading force. To approximate the logarithmic deformation, the curvature of the activator was designed by an exponential function. Subsequent design parameters were optimized by an evolutionary computation.
Highlights
A load cell is a transducer that quantitatively converts mechanical force and/or torque to an electrical signal [1,2,3]
This paper proposed a nonlinear load cell that deforms along a logarithmic strain curve with respect to an applied force
The load cell was composed of the activator and the linear torque measurement unit
Summary
A load cell is a transducer that quantitatively converts mechanical force and/or torque to an electrical signal [1,2,3]. When the measurement range increases, it is difficult to acquire force information with sufficient sensitivity in the small-force range because conventional load cells operate on a linear scale [13,14,15]. This is obvious and inevitable owing to the limitations of the ADC resolution. At a low value of applied force, it requires high sensitivity and vice versa To figure out these characteristics, a mathematical model was formulated and subsequent design parameters were determined
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