树脂传递模塑(resin transfer molding,RTM)工艺作为一种低成本、高尺寸精度的复合材料制备工艺,经过近两个世纪的发展已成为新型成型工艺技术的主流工艺。随着高新复合材料对力学强度、整体结构性、功能性越来越高的要求,传统RTM工艺...树脂传递模塑(resin transfer molding,RTM)工艺作为一种低成本、高尺寸精度的复合材料制备工艺,经过近两个世纪的发展已成为新型成型工艺技术的主流工艺。随着高新复合材料对力学强度、整体结构性、功能性越来越高的要求,传统RTM工艺也为迎合这些工业需求而不断发展改进。主要总结回顾了RTM工艺近些年的研究进展,并对衍生出的高压树脂传递模塑法(HIPRTM)、硅橡胶气囊辅助注入法(bladder-assisted RTM)、Seemann复合材料树脂渗透模塑法(SCRIMP)以及共注射树脂传递模塑法(CIRTM)的优缺点与应用前景进行介绍分析。展开更多
In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is...In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is established based on Matlab/Simulink sofware. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver s seat, the cab s pitch and roll angle are chosen as objective functions in low-frequency range. Experimental investigation is also used to verify the accuracy of the model. The influence of the damping coefficients of the AHM on the cab s ride quality is analyzed, and damping coefficients are then optimized via a genetic algorithm program. The research results show that the cab s rubber mounts added by the AHM clearly improve the ride quality under various operating conditions. Particularly, with the optimal damping coefficients of the front-end mounts c a 1,2 = 1 500 N · s/m and of the rear-end mounts c a 3,4 =2 335 N · s/m, the weighted RMS values of the driver s seat, the cab s pitch and roll angle are reduced by 22.2%, 18.8%, 58.7%, respectively. Under the condition of the vehicle travelling, with the optimal damping coefficients of c a 1,2 = 1 500 N · s/m and c a 3,4 =1 882 N · s/m, the maximum PSD values of the driver s seat, the cab s pitch and roll angle are clearly decreased by 36.7%, 54.7% and 50.6% under the condition of the vehicle working.展开更多
文摘树脂传递模塑(resin transfer molding,RTM)工艺作为一种低成本、高尺寸精度的复合材料制备工艺,经过近两个世纪的发展已成为新型成型工艺技术的主流工艺。随着高新复合材料对力学强度、整体结构性、功能性越来越高的要求,传统RTM工艺也为迎合这些工业需求而不断发展改进。主要总结回顾了RTM工艺近些年的研究进展,并对衍生出的高压树脂传递模塑法(HIPRTM)、硅橡胶气囊辅助注入法(bladder-assisted RTM)、Seemann复合材料树脂渗透模塑法(SCRIMP)以及共注射树脂传递模塑法(CIRTM)的优缺点与应用前景进行介绍分析。
基金The Science and Technology Support Program of Jiangsu Province(No.BE2014133)the Prospective Joint Research Program of Jiangsu Province(No.BY2014127-01)
文摘In order to evaluate the ride quality of the soil compactor cab supplemented by the auxiliary hydraulic mounts (AHM), a nonlinear dynamic model of the soil compactor interacting with the off-road deformable terrain is established based on Matlab/Simulink sofware. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver s seat, the cab s pitch and roll angle are chosen as objective functions in low-frequency range. Experimental investigation is also used to verify the accuracy of the model. The influence of the damping coefficients of the AHM on the cab s ride quality is analyzed, and damping coefficients are then optimized via a genetic algorithm program. The research results show that the cab s rubber mounts added by the AHM clearly improve the ride quality under various operating conditions. Particularly, with the optimal damping coefficients of the front-end mounts c a 1,2 = 1 500 N · s/m and of the rear-end mounts c a 3,4 =2 335 N · s/m, the weighted RMS values of the driver s seat, the cab s pitch and roll angle are reduced by 22.2%, 18.8%, 58.7%, respectively. Under the condition of the vehicle travelling, with the optimal damping coefficients of c a 1,2 = 1 500 N · s/m and c a 3,4 =1 882 N · s/m, the maximum PSD values of the driver s seat, the cab s pitch and roll angle are clearly decreased by 36.7%, 54.7% and 50.6% under the condition of the vehicle working.
