Xilu Zhao

A Point Cloud Registration Method Based on Point Cloud Region and Application Samples

In this study, a new automatic point cloud registration algorithm based on point cloud registration is proposed to broaden registration ways. The proposed method extracts features of point cloud region for performing the coarse registration. Based on the coarse registration results, the Iterative Closest Point (ICP) algorithm is used for performing the fine registration to restore the measured model. The proposed registration approach is able to do automatic registration without any assumptions about initial positions, and avoid the problems of traditional ICP algorithm in the bad initial estimation. The proposed method along with ICP algorithm provides efficient 3D modeling for computer-aided engineering, computer-aided design and application with Kinect.

3D Origami Structure Design and Simulation by Parametric Origami Module

The purpose of this paper is to propose a Parametric Origami Module and relevant methods, which are able to expand the complex three-dimensional origami structure into a plane only by the topological relation matrix TP and node position coordinate matrix GP. Furthermore, an extended data structure for POM is proposed as well. In this study, we are not limited to the particular conditions for design origami structure such as Ori-tatami folding and axial symmetry. Plenty of three-dimensional origami structures are analyzed from the geometrical perspective and the common features among them are extracted. In the end, we compare the proposed method with others in further discussion and confirm its effectiveness.

Hydroforming process of manufacturing for reverse spiral origami structure

The reverse spiral is an effective and representative origami structure that is able to effectively absorb energy in crash tests. Because of the irregular cross-section of the structure, it is manufactured by hydroforming; however, the process is complicated and its parameters are difficult to verify, so the fracture and excessive thinning problems of hydroforming have not yet been satisfactorily solved. To address these issues, a model was designed and the response surface method was applied to optimise the hydroforming processing parameters. By optimisation of the processing parameters, the maximum thinning rate of the optimised structure was decreased from 36.9% to 12.9% and the fracture and excessive thinning problems of hydroforming of reverse spiral origami structures have been solved.

Vehicle energy absorbers consisting of foldable cylinders using response surface methodology

In vehicle head-on collision, the side member cannot be collapsed more than 70% of its length because of its bulk. Moreover, its initial peak load is sometimes too high. So the authors have investigated the foldable origami cylinder structure - reversed spiral cylindrical (RSC) for the existing side member. RSC has solved these two problems mentioned above. In this paper, we treat so called crash box which is shorter than the side member. In the shorter length case, it makes much more difficult to solve the two problems mentioned above simultaneously. With using RSC for the crash box, it is requested to achieve that initial peak load is lower; meanwhile the amount of crash energy absorption is equal or higher than the existing energy absorber. In order to response to the difficulties, the authors try to seek an ideal design specification consisted by RSC and a straight cylinder.