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Físico redefine los criterios de diseño de las bicicletas para mejorar el rendimiento
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DAHON

Jul 03, 2023, 19:10 ET

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El físico revela fallas de diseño en bicicletas comunes y propone soluciones 

OLNEY, Illinois, 3 de julio de 2023 /PRNewswire/ -- El presidente de DAHON, uno de los principales fabricantes de bicicletas plegables, el Dr. David Hon anunció que ha descubierto fallas de diseño en varios tipos de bicicletas, incluidas las bicicletas de montaña, las bicicletas de carretera y algunas bicicletas eléctricas. Al evaluar la flexión del cuadro y su impacto en el rendimiento, el Dr. Hon ha desarrollado métodos teóricos y experimentales para la medición práctica de la flexión del cuadro. Una serie de artículos detallarán estos hallazgos y propondrán mejoras para optimizar la velocidad y el rendimiento.

La "bicicleta de seguridad" tradicional, con triángulos tubulares delanteros y traseros, ha sido el diseño estándar desde finales del siglo XIX. Aunque esta estructura ha dado buenos resultados, han surgido excepciones con la incorporación de bicicletas plegables y bicicletas de montaña de cola suave. La investigación del Dr. Hon tiene como objetivo abordar estos desafíos de diseño y brindar soluciones para mejorar el rendimiento en todas las categorías de bicicletas.

Al centrarse en el eje de pedalier ("bottom bracket" o BB) como componente clave en la flexión del cuadro, el Dr. Hon ha desarrollado un modelo que correlaciona los movimientos del BB con la fuerza de pedaleo. Esta relación entre los movimientos del BB y la fuerza de pedaleo es muy importante para la flexión del cuadro. Se utilizó una plataforma de pruebas CEN de la UE modificada para probar 45 bicicletas de varios tipos y medir la energía de flexión y la eficiencia de pedaleo. Los resultados se corroboran con experimentos de equitación. Los resultados revelaron hallazgos importantes, algunos sorprendentes (no todos), entre ellos:

  • Las ruedas y los cuadros más pequeños, así como los cuadros triangulados, son más rígidos.
  • Las bicicletas BMX fueron las más rígidas.
  • El cable DELTEC, que une el tubo de dirección al BB, mejora significativamente la rigidez y la velocidad de las bicicletas plegables de un solo tubo, lo que supera a todas las bicicletas de ruedas grandes probadas. DELTEC se destaca como una excelente cura para las bicicletas plegables de un solo tubo.
  • Las bicicletas de cola suave mostraron una flexibilidad excesiva en el eje trasero y la bicicleta plegable BXX fue identificada como la más suave debido a su pivote de suspensión trasera excepcionalmente bajo (ampliamente conocido en la industria), lo que hace que la bicicleta golpeara fuertemente al pedalear.
  • Las bicicletas más suaves eran hasta un 15% más lentas que las bicicletas más rígidas al subir una colina empinada de 20°.

El Dr. Hon enfatiza la importancia de la eficiencia de la propulsión en el diseño de cuadros de bicicletas para carreras, escalada y desplazamientos diarios. La próxima serie de artículos se titulará de la siguiente manera:

  1. La bicicleta plegable: problemas y soluciones
  2. Rigidez de la bicicleta frente a la eficiencia de pedaleo
  3. Bicicletas de cola suave: problemas y soluciones
  4. Rendimiento de las bicicletas rígidas

La serie propondrá mejoras viables para la mayoría de las categorías de bicicletas, con el objetivo de optimizar la velocidad y el rendimiento.

Visite el sitio web de DAHON en www.dahon.com para obtener más información y acceder a los artículos.

FUENTE DAHON

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