Research on multi-factor-modified workload evaluation model of replenishment operation and its simulation

doi:10.16265/j.cnki.issn1003-3033.2022.08.1308

Abstract

Abstract:

In order to improve accuracy of workload assessment and prevent WMSDs caused by fatigue of replenishment operation workers, a multi-factor-modified workload evaluation method based on energy consumption model was proposed. The replenishment operation was divided into handling operation cycle, opening box activity and restocking shelves operation cycle, and an energy consumption model suitable for replenishment was built. Then, with energy consumption and working time as main measurement indexes, oxygen consumption, working posture and ergonomics index of lower back were introduced as correction factors, and a workload assessment model was established. Finally, the model's effectiveness and accuracy were verified through the case of Jack digital human simulation. The results show that compared with workload evaluation that only considers energy consumption and operation time, the proposed one is closer to actual situation, and is more helpful to prevent WMSDs in replenishment operation as multi-ergonomic factors can correct assessment results. Moreover, energy consumption and workload are significantly affected by quantity of replenishment and shelving.

Key words: multi-factor correction, replenishment operation, workload, evaluation model, work-related musculoskeletal disorders (WMSDs), energy consumption, Jack simulation

CHEN Changhua, XU Shuaishuai, JIANG Yuxiang, YANG Xiaojie, XIONG Guanghui. Research on multi-factor-modified workload evaluation model of replenishment operation and its simulation[J]. China Safety Science Journal, 2022, 32(8): 201-207.

Figures/Tables 7

Fig.1

Fig.2

Tab.1

Fig.3

Tab.3

Comparison of three workload assessment models and results

工作负荷评估方法	方法1	方法2	方法3
工作负荷评估方法	以能量消耗为衡量指标^{[10⇓⇓⇓-14]}	以能量消耗和作业时间为衡量指标^[18]	以能量消耗和作业时间为衡量指标,考虑多因子修正
工作负荷评估模型	$W = E t E r$	$W = E t E r · t α t β$	$W = α E t E r · t α t β$
工作负荷W	1.286	0.769	0.787
工作负荷等级	5	3	3

Tab.3

Fig.4

Fig.5

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等级	工作负荷W	说明
1	≤0.4	工作负荷低,作业人员不能得到充分利用,造成资源浪费
2	(0.4,0.6]	工作负荷相对较低,补货作业可以根据实际情况进行调整
3	(0.6,0.8]	工作负荷正常,补货作业强度与人体生理健康达到相对平衡
4	(0.8,1]	工作负荷较高,需要改善以减轻作业人员的作业负担
5	>1	工作负荷不合理,无法完成作业,需要立即重新制定