Subtopic: Human engineering and safety considerations in design of tractor and agricultural implements
Question Statement:
In tractor ergonomics and human whole-body vibration studies (ISO 2631-1), the seated human body exhibits maximum biological resonance and fatigue sensitivity to vertical vibrations in the frequency range of:
Options:
(A) $4 - 8\text{ Hz}$ (due to resonance of internal visceral organs and spinal column)
(B) $50 - 100\text{ Hz}$
(C) $500 - 1000\text{ Hz}$
(D) $0.01 - 0.05\text{ Hz}$
Answer Key:
A
Step-by-Step Solution & Explanation
Under ISO 2631-1, vertical z-axis vibrations in the 4 to 8 Hz frequency band coincide with natural resonance of the human spine and thorax-abdomen system, leading to spinal disc compression, operator fatigue, and musculoskeletal disorders.