Effects of Frequency and Mass of Eccentric Balls on Picking Force    of The Coffee Fruit for The As-Fabricated Harvesting Machines

Chau, Minh Quang; Nguyen, Vo Tien

doi:10.18517/ijaseit.9.3.8578

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Additionally, thermal-assisted machining contributes significantly to increased contactlength between the cutting tool and the chip. The contactlength between the cutting tool and chip is one of the main factors influencing shear force, vibration, and cutting stress [26]. SEM images show that heating at 650 o C increases contact-length between cutting tool and chip by 2.05 times.…”

Section: Introductionmentioning

confidence: 99%

[RETRACTED] Experimental Study on Impact of Thermal-Assisted Machining on SKD11 Steel Machinability

Hoang¹,

Nguyen²,

Truong³

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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Machining in a heated environment has been used in pressure machining and metal cutting. Thermal-assisted machining is a new machining method performed on conventional machine tools, CNC machines, in which the workpiece is heated before machining. Different heat sources do the thermal-assisted: electrical energy, laser beam, magnetic induction. However, there is very little research on thermal-assisted machining when milling SKD11 steel, a difficult-in-processing material but widely used in the industry. Material machinability refers to the ability of material machining that is difficult or easy. Material machinability is measured by tool life, material removal ability, shear force, cutting vibration, surface roughness. The material's machinability is directly influenced by its microscopic structure and is related to the cutting mode. This paper has highlighted the study of material machinability when thermal-assisted machining and compared to the conventional one. This study also highlights the crucial role in assessing the effect of heating on the SKD11 steel machinability. This study analyzed the technological parameters' role on the shear force, chip shrinkage, surface roughness, and shear vibrations during normal machining and SKD11 steel heating. The study results showed that the material's microstructure and the amplitude of vibration did not change under the heating process's effect with a temperature range of 200 o C -400 o C. However, the shearing force during heat processing is drastically reduced compared to conventional machining. Chip shrinkage increased by 31.7% when heated to 400 o C, while roughness decreased by 47.1%.

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Section: Introductionmentioning

confidence: 99%

[RETRACTED] Experimental Study on Impact of Thermal-Assisted Machining on SKD11 Steel Machinability

Hoang¹,

Nguyen²,

Truong³

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

View full text Add to dashboard Cite

show abstract

“…Due to the operating characteristics, this vehicle must brake to pick up passengers at the stops continuously on the moving road. So this model often has a high fuel consumption, meaning many gas emissions into the surrounding environment [26]. To replace all of these vehicles with vehicles applying regenerative braking technology to reduce pollution, this is a difficult problem for the economy in developing countries like Vietnam [26]- [28].…”

Section: Introductionmentioning

confidence: 99%

“…So this model often has a high fuel consumption, meaning many gas emissions into the surrounding environment [26]. To replace all of these vehicles with vehicles applying regenerative braking technology to reduce pollution, this is a difficult problem for the economy in developing countries like Vietnam [26]- [28]. Therefore, with the above actual situation, the study and test of hydraulic accumulator brake system model on the bus vehicle to solve the problem as follows:…”

Section: Introductionmentioning

confidence: 99%

[RETRACTED] Investigation for Evaluating the Energy Recovery Capacity of the Mechanical Brake System on Urban Buses: A Case in Vietnam

Trinh

Nguyen

Dong

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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Currently, traditional fossil energy is gradually exhausted for sustainable economic development, and environmental protection is an urgent requirement for all countries. Therefore, the issue of saving energy, as well as exploiting renewable energy sources, is being prioritized for development. The braking system collects dynamic energy, also known as the regenerative braking system, which is understood as the brake system; instead of converting kinetic energy into heat, the brake system can collect and store energy. The brake system of the bus in use is usually frictional. During braking, this type of brake system converts the vehicle's kinetic energy into heat, dissipates it into the surrounding environment, and cannot be recovered. Moreover, due to the operational characteristics, the bus has high stopping frequency and high braking capacity, leading to wasted energy, in addition to producing many emissions causing environmental pollution. This study focuses on experimental research for evaluating the dynamic energy acquisition of the mechanical brake system on a school bus as a function of operating parameters such as vehicle speed according to gears, vehicle mass as well as hydraulic pressure parameters. The results are noticed that the highest dynamic energy recovery rate is about 35% in the lowest gear. In the case, from the initial braking velocity of 30km/h to 0 km/h, the initial working pressure of the hydraulic tank is 100bar, the dynamic energy recovery rate is about 25%.

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“…Several researchers have previously implemented a coffee bean classifier using the principle of vibration to classify coffee beans [34,35]. However, these classifiers are generally not ergonomic because the design does not fit the dimensions of the worker's body size.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Test of the Coffee Bean Classifier

et al. 2021

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Currently, some coffee production centers still perform classification manually, which requires a very long time, a lot of labor, and expensive operational costs. Therefore, the purpose of this research was to design and test the performance of a coffee bean classifier that can accelerate the process of classifying beans. The classifier used consisted of three main parts, namely the frame, the driving force, and sieves. The research parameters included classifier work capacity, power, specific energy, classification distribution and effectiveness, and efficiency. The results showed that the best operating conditions of the coffee bean classifier was a rotational speed of 91.07 rpm and a 16° sieve angle with a classifier working capacity of 38.27 kg/h: the distribution of the seeds retained in the first sieve was 56.77%, the second sieve was 28.12%, and the third sieve was 15.11%. The efficiency of using a classifier was found at a rotating speed of 91.07 rpm and a sieve angle of 16°. This classifier was simple in design, easy to operate, and can sort coffee beans into three classifications, namely small, medium, and large.

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Effects of Frequency and Mass of Eccentric Balls on Picking Force of The Coffee Fruit for The As-Fabricated Harvesting Machines

Cited by 4 publications

References 7 publications

[RETRACTED] Experimental Study on Impact of Thermal-Assisted Machining on SKD11 Steel Machinability

[RETRACTED] Experimental Study on Impact of Thermal-Assisted Machining on SKD11 Steel Machinability

[RETRACTED] Investigation for Evaluating the Energy Recovery Capacity of the Mechanical Brake System on Urban Buses: A Case in Vietnam

Design and Performance Test of the Coffee Bean Classifier

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