Improvement of heterogeneous deformation measurement in digital image correlation

Abstract

Heterogeneous deformation measurement using traditional digital image correlation (DIC) has times error of homogeneous deformation due to localized complexity. In case of small strain window, displacement field error will substantially corrupt the derived strain. On the contrary, large strain window will induce a reasonable information reduction in particular of heterogeneous deformation. In this paper, a novel parameter was put forward to correct displacement field and select strain subset size dynamically. This parameter was determined by localized displacement field that is called the localized displacement non-uniform intensity (λ). In addition, there is a simple and effective method to eliminate the rigid body rotation impact on strain measurement. A series of speckle images containing different heterogeneous deformation are simulated finally. Results show that the accuracy on the displacement and strain field can be substantially improved especially in heterogeneous deformation fields.

Integrated control performance of drive-by-wire independent drive electric vehicle

“…Zhao et al [5] established a 14-DOF vehicle model, then studied the coordinated control among active suspension system (ASS), AFS and DYC and found that the method could effectively improve the lateral and longitudinal dynamics of vehicles. Shen et al [6] combined four-wheel steering (4WS) with DYC to ensure vehicle stability by generating appropriate 4WS angle and correcting yaw moment based on sliding mode control and verified the effectiveness of the method through experiments. In this study, an integrated control method combining ARS with DYC was designed for 4WID to improve the control effect when the tyre was in the non-linear state.…”