Problem statement: Human femur fracture is one of the most frequent type of bone fractures. One of the widely used methods in an internal fixation is an application of the Dynamic Compression Plate (DCP). The configuration of the screw fixation plays a major role of the DCP stress. Approach: This research is proposed to investigate the stress distribution in the 14-hole DCP by using Finite Element Analysis (FEA), eight configurations of the screw fixation with the body weight of 50 and 70 kg. The maximum von Mises stress on the DCP in each configuration is used to find the best of the screw fixations. The equations of the maximum von Mises stress are formulated by the regression analysis. Results: The experimental results show that the relation of the maximum von Mises stress and the number of screws are the linear equation. Conclusion: The maximum von Mises stress from FEA could be predicted by using the linear equation.
Problem statement:The interfragmentary strain (εIF) is the important parameter for femur fracture healing. The Dynamic Compression Plate (DCP) is commonly used in femur fracture. The DCP and the fractured femur are fixed by using the conventional screws. Approach: This research is proposed to investigate the effect of configuration of the screw fixation on the interfragmentary stain by using Finite Element Analysis (FEA), eight configurations of the screw fixation with the body load of 400 and 500 N. Results: The experimental results show that the relation of εIF and screws are the polynomial equations. Conclusion: We can decrease the interfragmentary strain by adding the number of screw with the groups of screw configuration.
The diesel engine vibration is one of the main problems of engine damage. When the hydrogen-diesel dual fuel is used, it may affect the engine vibration. Therefore, it is necessary to study the effect of hydrogendiesel dual fuel. The regression analysis is used to find the relations between hydrogen percentage and the engine vibration. The results for all cases found that the relation between the Average Peak Acceleration (APA) and hydrogen percentage (%H 2 ) can predict by using linear equation with average coefficient of determination (R 2 ) = 0.8973 or 2nd polynomial equation with R 2 = 0.9592. All graphs are the decreasing function. APA can decrease by increasing %H 2 . The relation between the average peak acceleration and hydrogen percentage can predict by using linear equation or 2nd polynomial equation. The average peak acceleration can decrease by increasing hydrogen percentage. In the other word, the engine vibrations can decrease by increasing hydrogen percentage.
Nowadays, the number of petroleum-fuel vehicles has been continuously increasing despite of the arising of electric vehicles. Thanks to the environmental concerns, the EV is being developed in both of its performance and cost reduction aspects. However the petroleum-fuel vehicles are still popular because of their more economical sale prize, low-cost maintenance, and wider after-sale services. This paper presents the correlation between the vibration and sound signals of a personal gasoline engine car, since the important interfaces of the car users are the perceived vibration and sound signals. In the experimental design, three vibration sensors and three condensed microphones at different positions have been allocated systematically according to the most perception of car users. A quantity of the engine vibration and sound signals have been measured and prepared as collections of signal databases. The signal feature of first pitch is considered due to its indication of main engine frequency. The fast Fourier transform (FFT) is applied the frequency spectrum of the signal in all databases. Subsequently, the first dominant peak occurring in the spectrum is selected and recorded for both of its frequency and its magnitude. These attributes are then analyzed as comparison with different engine speeds. Finally, the correlations of these attributes between the vibration and sound signals are presented. From the proposed correlation function, some pairs of the signal features expose significant relationships, for example, the sound signal at the exhaust pipe and the vibration signal at the seat when considering the magnitudes at the emerging dominant frequencies.
The screw torque is applied at the screw head to fix the plate and the bone. It generates the compressive force between the plate and the bone to stabilize them. The interfragmentary strain is the main factor for healing the bone fractured. The screw torque level affects the interfragmentary strain and the stability of the fixation between the plates an the bone. The interfragmentary modulus is the new factor of the plate fixation stability and it is affected by the torque level. This research is proposed to study the effect of the screw torque level on the interfragmentary strain and the interfragmentary modulus. The interfragmentary strain and the interfragmentary modulus decrease by increasing the screw torque level
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