Compliant mechanisms’ design aims to create a larger workspace and simple structural shapes because these mechanical systems usually have small dimensions, reduced friction, and less bending. From that request, we designed optimal bridge-type compliant mechanism flexure hinges with a high magnification ratio, low stress by using a flexure joint, and especially no friction and no bending. This joint was designed with optimal dimensions for the studied mechanism by using the method of grey relational analysis (GRA), which is based on the Taguchi method (TM), and finite element analysis (FEA). Grey relational grade (GRG) has been estimated by an artificial neural network (ANN). The optimal values were in good agreement with the predicted value of the Taguchi method and regression analysis. The finite element analysis, signal-to-noise analysis, surface plot, and analysis of variance demonstrated that the design dimensions significantly affected the equivalent stress and displacement. The optimal values of displacement were also verified by the experiment. The outcomes were in good agreement with a deviation lower than 6%. Specifically, the displacement amplification ratio was obtained as 65.36 times compared with initial design.

In a previous study, a fresh chili destemming system has been proposed, and the TCS3200 color sensor was used as low-cost equipment in the arrangement section of the system. However, the working and installing parameters have not yet been investigated in detail. This study focused on investigating the optimal working conditions of TCS3200 on the fresh chili destemming system. The study included three experiments including the effect of the red and green color channels, the effect of the height between the sensor and fruits, and the effect of the running velocity on the received signal level of the sensor. A total of 260 ripen fruits were chosen to test. The results showed that the red channel generated a stronger signal than the green one. The optimal height from the sensor to the fruits was obtained at 25 mm, and the maximum conveyor velocity is limited to 100 mm/s. This study helps to determine the optimal operating parameters and enhance the working ability of a low-cost sensor. However, the high-speed pushing actuating mechanism should be developed in further works.

The present study investigates the effects of cutting parameters (cutting speed, feed rate, and depth of cut) on the roughness of the finished surface during turning C45 steel using CNC QUICK TURN 150 SG (Mazak, Japan) with carbide inserts WNMG431PP CA525 (Kyocera Precision Tools TAC08616). The experiment design was based on the Taguchi method. The results show that the feed rate significantly influences surface roughness; the cutting velocity is second in order, and the depth of cut is the weakest influence parameter on the surface roughness. The regression equation was proposed to predict the roughness of turned surfaces and its determination coefficient ( ) of 0.9985. The prediction predicted by the regression models is compared to the experiment. The mean absolute and square error values are 6.73% and 0.85%. Hence, the model is reliable in estimating surface roughness.

1. Surface roughness (Ra) is widely recognized as a critical indicator of machined surface quality, directly influencing key functional characteristics of engineering components, including dimensio...

Trong nghiên cứu này, ảnh hưởng của các thông số chế độ cắt (tốc độ cắt v, lượng tiến dao f và chiều sâu cắt t) tới độ nhám bề mặt trong gia công phay mặt bên bằng dao phay ngón của chi tiết hợp kim nhôm 6061 được nghiên cứu theo phương pháp Taguchi và phân tích phương sai (ANOVA). Kết quả cho thấy, f ảnh hưởng đáng kể tới độ nhám bề mặt, tiếp đó là và ảnh hưởng yếu nhất là v. Mô hình hồi quy dùng để dự đoán độ nhám được xác định và độ tin cậy R2 = 99,62%. Độ nhám dự đoán từ hàm hồi quy và độ nhám thực tế có phần trăm sai số trung bình (%MAE) và phần trăm bình phương sai số trung bình (%MSE) lần lượt là 3,154% và 0,222%. Mô hình hồi quy phù hợp để dự đoán độ nhám bề mặt trong quá trình gia công phay tinh hợp kim nhôm 6061.