Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / People have been known to carry heavy loads with bamboo poles in parts of Asia for centuries. Large, bulky loads are often carried in large baskets tied with a long rope to each end of the pole. Carry loads with compliant bamboo poles may reduce the peak forces of carrying a given load. Further, compliant poles free the arms, which may then be used to help stabilize the baskets from swaying during locomotion. (a) “Yoke China” by unknown author is licensed under CC-BY-SA-3.0, via Wikimedia Commons. (b) “Chinese Women are Carrying Basket” by Stougard is licensed under CC-BY-SA-3.0, via Wikimedia Commons. Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / Possible configurations of a bamboo pole for carrying a load. The load is assumed to be evenly split on each end of the pole for balance. Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / Diagram showing our overall approach Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / The hip-actuated SLIP model of walking and running with a vertically constrained load suspension and representative trajectories. During running, the leg touches down when θ = β. During walking, there are two independent legs, with θ and Ψ describing the angle of each leg in stance. Each leg touches down independently when θ = β or Ψ = β. In both models, the leg lifts off of the ground when the vertical component of the leg's ground reaction force is 0 N. Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / The bamboo pole supported on the shoulder with a symmetrically distributed load P could be treated as an equivalent linear beam bending system with simplified boundary conditions Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / The area moment of inertia about the centroid for a split bamboo pole with a hollow semicircular cross section (HSC) can be calculated using the parallel axis theorem by subtracting the moment of inertia about the HSC centroid (X HSC ) of the smaller semicircle (SSC) from the larger semicircle (SC) Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / The model trajectories of the load and the body (left) approximate the experimental results (right, reproduced from Ref. [1]). The results for the hip-SLIP model show the dynamics of the system at steady state, which differs from the more complex behavior shown in the actual experimental data. Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / The peak force predictions of the model for a compliant pole and a rigid backpack as compared to the experimental results reported by Kram Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / Model predictions of the peak shoulder forces over a range of effective pole stiffness values while running with a 15 kg load at 3 m/s, walking with a 15 kg load at 1 m/s and 1.34 m/s, and walking with a 30 kg load at 1 m/s and 1.34 m/s Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / Recommended bamboo pole design region for running with a 15 kg load at 3 m/s Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / Recommended bamboo pole design region for walking with a 15 kg load at 1 m/s and 1.34 m/s Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / Recommended bamboo pole design region for walking with a 30 kg load at 1 m/s and 1.34 m/s Figure Legend:

Date of download: 6/21/2016 Copyright © ASME. All rights reserved. From: Design of Compliant Bamboo Poles for Carrying Loads J. Mech. Des. 2015;137(1): doi: / Other possible designs of carrying yokes which are strong and sufficiently compliant. The top two images the side profile and the top profile of a yoke that could be carved from wood which would have a high second moment of inertia and a relatively low distance to the neutral axis, increasing strength. The bottom image shows a stacked arrangement of flattened wood or bamboo. Figure Legend: