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The effect of a slack-pulling device in reducing operator physiological workload during log winching operations.

Raffaele Spinelli1, Giovanna Ottaviani Aalmo, Natascia Magagnotti

  • 1a AFORA , University of the Sunshine Coast , Locked Bag 4, Maroochydore DC , QLD 4558 , Australia.

Ergonomics
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PubMed
Summary

A hydraulic slack puller improved logging efficiency by enabling single-operator cable pulling. However, it did not reduce the physiological workload for log winching tasks, as the main stressor remains navigating steep slopes.

Keywords:
agriculture ergonomicsequipment designindustrial ergonomicsoperator physiological workload

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Area of Science:

  • Forestry Operations
  • Occupational Ergonomics
  • Logging Technology

Background:

  • Log winching tasks in mountainous terrain are physically demanding for operators.
  • Current methods may not adequately address the primary physiological stressors.
  • Technological interventions are being explored to improve operator well-being and efficiency.

Purpose of the Study:

  • To evaluate the impact of a hydraulic slack puller on operator physiological workload during log winching.
  • To compare the efficiency of winching operations with and without the hydraulic slack puller.
  • To identify the primary stressors affecting operators in steep slope logging environments.

Main Methods:

  • Comparative testing of a hydraulic slack puller in northern Italian mountains.
  • Inclusion of five volunteer operators representing the regional logging workforce.
  • Measurement of operator heart rate to quantify physiological workload during specific tasks.

Main Results:

  • The hydraulic slack puller enhanced the efficiency of downhill winching, allowing solo cable extraction.
  • No significant reduction in the overall physiological workload of operators was observed.
  • Operator heart rate data indicated that slope traversal, not cable pulling, is the primary stressor.

Conclusions:

  • While improving winching efficiency, the hydraulic slack puller does not mitigate the main physiological demands of steep slope logging.
  • Interventions focused solely on secondary stressors like cable pulling are unlikely to substantially reduce operator workload.
  • Further research should consider ergonomic solutions addressing the physical demands of navigating steep terrain.