Stack structured hybrid load cell for a high-stroke system

Kim, Namryul; Lee, Bumjoo

doi:10.1299/jamdsm.2019jamdsm0029

Cited by 1 publication

(3 citation statements)

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“…Since there is a trade-off between the precision and the operating range, an optimal mapping model is required. In this section, mathematical model of input and output for the general sensory system is reviewed [1]:…”

Section: Logarithmic Strain Modelmentioning

confidence: 99%

“…A load cell is a transducer that quantitatively converts mechanical force and/or torque to an electrical signal [1,2,3]. When the load is applied to the sensor system, the elastic part of the mechanical structure is deformed on a micro scale.…”

Section: Introductionmentioning

confidence: 99%

“…This illustrates that the system has high sensitivity at a low input value and low sensitivity at a high input value. Similarly, the load cell has to follow a nonlinear behavior to cover the wide measurement range with sufficient performance [1]. In other words, at a low value of applied force, it requires high sensitivity and vice versa.…”

Section: Introductionmentioning

confidence: 99%

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Logarithmic Strain Model for Nonlinear Load Cell

Hong

Lee

2019

Sensors

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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.

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Section: Logarithmic Strain Modelmentioning

confidence: 99%