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Technical Briefs

Investigation of the Effect of Moving Forklift on Data Transmission of IEEE 802.15.4 Wireless Sensor Radio

[+] Author and Article Information
Lei Tang

Department of Mechanical Engineering,  Clemson University, Clemson, SC 29634

Fan Yang, Kuang-Ching Wang

Department of Electrical and Computer Engineering,  Clemson University, Clemson, SC 29634

Daxing Zhang

School of Mechano-Electronic Engineering,  Xidian University, Xi’an 710071, China

Yong Huang1

Department of Mechanical Engineering,  Clemson University, Clemson, SC 29634yongh@clemson.edu

1

Corresponding author.

J. Manuf. Sci. Eng 134(4), 044505 (Jul 18, 2012) (7 pages) doi:10.1115/1.4006968 History: Received March 19, 2011; Accepted April 20, 2012; Published July 18, 2012; Online July 18, 2012

Low-cost wireless sensors embedded in machines and plant floors are essential components for intelligent monitoring and automation in automated manufacturing systems. To enable robust and confident industrial adoption of wireless sensor systems, their data transmission performance must be guaranteed before deployment. Moving objects such as forklifts in common manufacturing settings are known to cause errors and losses in wireless sensor data transmission. As an essential step toward building wireless sensor-based manufacturing plant floor monitoring systems, this study has conducted systematic data transmission performance measurements with IEEE 802.15.4 sensors in the presence of a moving forklift. It is found that for a typical moving forklift, its path loss profile can be predicted based on its stationary path loss profile. Specifically, the path loss for a moving forklift can be adequately modeled using a two-state time-dependent model with both deterministic and random contributions. Such a two-state path loss model can be applied to adequately estimate the packet error rate in the presence of moving objects.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 2

(a) PER and (b) PER and PLR difference for transmit powers in stationary forklift experiments

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Figure 3

Path loss comparison in stationary and moving (with one sigma standard deviation shown) forklift measurements

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Figure 4

Path loss, LQI, and per-packet reception status information with a 0 dBm transmit power in moving forklift experiments (C: correct reception, E: reception with bit errors, and L: packet lost for each transmission)

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Figure 5

(a) Path loss profile of additional stationary forklift measurements and (b) path loss comparison using the averaged information from additional stationary forklift measurements

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Figure 1

(a) TCM forklift and the height (0.9 m) of radio position and (b) radio placement and forklift movement in forklift experiments (not to scale)

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