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<p>Generally, simple beam or plate like specimens are used for vibration analysis in natural fibre reinforced composites (NFRCs). In this study, the vibration analysis of a natural fibre reinforced composite cabin for a top load washing machine under controlled imbalance loads is investigated experimentally and comparatively. In this study, the main objective is to evaluate whether a composite cabin will reduce the dynamic displacement in comparison to an existing metal cabin by extending the study to a cabin geometry that is applicable to a washing machine. Four outer cabins (FFF, PPP, FPF, and PFP) were designed and manufactured by a hand lay-up process using bidirectional flax (F) and pineapple (P) mats in a polyester resin matrix. Uniform fibre distribution with a low amount of void content in the composite material was verified by scanning electron microscopy. The composite cabins and the existing outer metal cabin were tested using a modified top-load washing machine rotating drum at speeds of 480&#xa0;rpm, 560&#xa0;rpm, and 680&#xa0;rpm under four different unbalanced masses of 0&#xa0;g, 10&#xa0;g, 20&#xa0;g, and 30&#xa0;g. The composite cabins were geometrically identical to an existing top-load metal washing machine cabin. Dual uniaxial accelerometers were used to detect the vibration response, and FFT analysis was used to process the data. For each configuration, the operating resonance conditions were obtained, and these were the speeds of the rotating drum where the maximum displacement was recorded. The results showed that despite being 1.2&#xa0;kg lighter than the metal cabin, the all-flax cabin (FFF) reduced the dynamic displacement by an average of 55–60% under all test conditions. This is due to the good vibration-damping properties and stiffness of the flax fibres. In line with the idea of Classical Laminate Theory, which states that high-stiffness fibres placed on outer layers maximize flexural rigidity, a consistent material performance order was established: FFF &lt; FPF &lt; Metal &lt; PFP &lt; PPP. This study shows that NFRCs can significantly reduce the vibration and weight in intricate constructions. The results display the possibility of sustainable NFRC alternatives in vibration-critical applications and give an experimental basis for their development, while also recognize the necessity for more research into long-term ecological performance.</p>

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Vibration Behaviour of Natural Fibre-Reinforced Composite and Metal Outer Cabins for Top-Load Washing Machines: An Experimental Investigation

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Ravikumar Parekh,
  • Haresh Patolia

摘要

Generally, simple beam or plate like specimens are used for vibration analysis in natural fibre reinforced composites (NFRCs). In this study, the vibration analysis of a natural fibre reinforced composite cabin for a top load washing machine under controlled imbalance loads is investigated experimentally and comparatively. In this study, the main objective is to evaluate whether a composite cabin will reduce the dynamic displacement in comparison to an existing metal cabin by extending the study to a cabin geometry that is applicable to a washing machine. Four outer cabins (FFF, PPP, FPF, and PFP) were designed and manufactured by a hand lay-up process using bidirectional flax (F) and pineapple (P) mats in a polyester resin matrix. Uniform fibre distribution with a low amount of void content in the composite material was verified by scanning electron microscopy. The composite cabins and the existing outer metal cabin were tested using a modified top-load washing machine rotating drum at speeds of 480 rpm, 560 rpm, and 680 rpm under four different unbalanced masses of 0 g, 10 g, 20 g, and 30 g. The composite cabins were geometrically identical to an existing top-load metal washing machine cabin. Dual uniaxial accelerometers were used to detect the vibration response, and FFT analysis was used to process the data. For each configuration, the operating resonance conditions were obtained, and these were the speeds of the rotating drum where the maximum displacement was recorded. The results showed that despite being 1.2 kg lighter than the metal cabin, the all-flax cabin (FFF) reduced the dynamic displacement by an average of 55–60% under all test conditions. This is due to the good vibration-damping properties and stiffness of the flax fibres. In line with the idea of Classical Laminate Theory, which states that high-stiffness fibres placed on outer layers maximize flexural rigidity, a consistent material performance order was established: FFF < FPF < Metal < PFP < PPP. This study shows that NFRCs can significantly reduce the vibration and weight in intricate constructions. The results display the possibility of sustainable NFRC alternatives in vibration-critical applications and give an experimental basis for their development, while also recognize the necessity for more research into long-term ecological performance.