Design of an Ergonomic Rotating Steering System on an Electric Cart Based on RULA Analysis (Rapid Upper Limb Assessment) and Using Solidworks Software

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Made Sudana, Made Rajendra, Yusuf, Gede Nyoman Suta Waisnawa
Department of Mechanical Engineering, Politeknik Negeri Bali, Bali, Indonesia

American Journal of Science, Engineering and Technology (Science Publishing Group) 2023
8 : 4
217-225
10.11648/j.ajset.20230804.17
English
I. Made Sudana, I. Made Rajendra, M. Yusuf, I. Gede Nyoman Suta Waisnawa. (2023). Design of an Ergonomic Rotating Steering System on an Electric Cart Based on RULA Analysis (Rapid Upper Limb Assessment) and Using Solidworks Software. American Journal of Science, Engineering and Technology, 8(4), 217-225. https://doi.org/10.11648/j.ajset.20230804.17. Share Research.
Abstract
Designing material transportation equipment using human-powered carts is not efficient. An electric drive system can be an environmentally friendly system that can be implemented on three-wheeled carts, thereby replacing the role of humans in doing so. developing an electric drive device with a 48 V 1000watt Brushless DC (BLDC) type, 12 Ah lithium ion battery, so that it can reduce pollution problems and also meet the needs of the domestic automotive sector. This research aims to design and build a rotary steering drive system for a three-wheeled electric cart to make it lighter and easier. The steering seat frame functions to support the driver and a structural analysis was carried out using ergonomic analysis using the RULA method. Meanwhile, to determine the strength of the frame material and components of the cart steering system using SolidWorks software simulation. Based on the results of research on the design of the cart frame and steering system frame made of alloy steel with SolidWorks analysis for frame loading, it shows that the maximum stress value that occurs is still below the yield strength value of the material, the results of the frame loading safety factor value have exceeded the required value, so that very safe to withstand a load of 1962.33 N. Meanwhile, when loading the steering frame and steering mount, the maximum stress value that occurs is still below the material yield strength value, the resulting loading safety factor value has exceeded the required value, so it is very safe to withstand a load of 784.58 N. The results of the RULA method analysis on the ergonomic design of the rotary steering system show that the MSDs risk score for the new driver's posture after ergonomic intervention is 2 (two), which means the MSDs risk category is good, for the cart moving forward or backward. This means that the cart driver's posture is acceptable as long as it is not maintained. or recurring for a long time. Analysis of the power consumption of three-wheeled electric cart testing, namely the maximum value without load produces 571.14 Watts, while testing with load produces 583.68 Watts. This affects the use without load and with load on the performance/speed produced by the 48V1000 Watt BLDC motor. The prototype design of this three-wheeled electric cart has the advantage that it can be used on narrow roads and alleys in hotel or company yards.
Steering System, Electric Cart, Solid Works, RULA, Ergonomics

Designing material transportation equipment using human-powered carts is not efficient. An electric drive system can be an environmentally friendly system that can be implemented on three-wheeled carts, thereby replacing the role of humans in doing so. developing an electric drive device with a 48 V 1000watt Brushless DC (BLDC) type, 12 Ah lithium ion battery, so that it can reduce pollution problems and also meet the needs of the domestic automotive sector. This research aims to design and build a rotary steering drive system for a three-wheeled electric cart to make it lighter and easier. The steering seat frame functions to support the driver and a structural analysis was carried out using ergonomic analysis using the RULA method. Meanwhile, to determine the strength of the frame material and components of the cart steering system using SolidWorks software simulation. Based on the results of research on the design of the cart frame and steering system frame made of alloy steel with SolidWorks analysis for frame loading, it shows that the maximum stress value that occurs is still below the yield strength value of the material, the results of the frame loading safety factor value have exceeded the required value, so that very safe to withstand a load of 1962.33 N. Meanwhile, when loading the steering frame and steering mount, the maximum stress value that occurs is still below the material yield strength value, the resulting loading safety factor value has exceeded the required value, so it is very safe to withstand a load of 784.58 N. The results of the RULA method analysis on the ergonomic design of the rotary steering system show that the MSDs risk score for the new driver's posture after ergonomic intervention is 2 (two), which means the MSDs risk category is good, for the cart moving forward or backward. This means that the cart driver's posture is acceptable as long as it is not maintained. or recurring for a long time. Analysis of the power consumption of three-wheeled electric cart testing, namely the maximum value without load produces 571.14 Watts, while testing with load produces 583.68 Watts. This affects the use without load and with load on the performance/speed produced by the 48V1000 Watt BLDC motor. The prototype design of this three-wheeled electric cart has the advantage that it can be used on narrow roads and alleys in hotel or company yards.

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