In this paper, cam profile dynamic modeling and analysis of the cam slider modulator are presented. The nonlinear dynamic model is derived for the modulator equation with consideration of the flexible effect. The fourth order RungeKutta method is employed to for response solving. The lumped parameter and Monte Carlo simulation methods are also utilized. Modulator roller vibration with regard to the cam profile machining errors are analyzed. In order to analyze the vibrational response at different speeds, VB.net simulation is performed. The results demonstrate that the disturbed cam profile vibrates smoothly and randomly when the dobby speed is less than 400 r/min. Furthermore, it is observed that the operating dobby speed should not exceed 900 r/min. For disturbed cam profile system, when the speed of the dobby is less than 400 r/min, small follower vibration response is observed. When dobby speed is greater than 200 r/min, significant impact on the follower vibration response is observed.

Long molding times and the impossibility of remelting or reforming carbon fiber-reinforced plastics (CFRPs) that contain thermosetting resin after molding have led researchers to focus on carbon fiber-reinforced thermoplastics (CFRTPs) made with thermoplastic resin. Compared to CFRPs, CFRTPs are easier to recycle, but they generally exhibit strength properties that are inferior to those of CFRPs due to poor adhesion between the carbon fiber and the resin. To address this issue, we devised a new surface modification method (using a titania solution) to improve adhesion between fiber and the resin. Fragmentation and tensile tests were used to evaluate the effect of the surface modification method on CFRTP adhesion. The results indicate that surface modification can enhance adhesion in CFRTP, which may improve the material’s mechanical properties.

FRTP is highly recyclable and suitable for mass production. In addition, by using the spread yarns treated in a wide and thin state as the woven structure, it is expected that the generation of voids at the time of impregnation will be reduced and the mechanical properties will be improved, and the impregnation time will be shortened. In this study, the effect of ply thickness on a damage development behavior of woven CFRTP using spread yarns was investigated by FEM based on damage mechanics. Firstly, finite element models of the woven structure with different ply thickness changed from the conventional yarns to the spread yarns were created. Secondary, as the material properties of the model, that of the UD material were applied to the fiber bundle, and the material nonlinear model based on stress dependence of the thermoplastic resin was applied to the matrix. Finally, damage development analysis was carried out on those models. As a result, it was clarified that the damage development behavior in the fiber bundle and in the matrix differs depending on the ply thickness.