Research on coordination design method of main bearing assembly structure based on the maximum radial deformation of bearing bush

Aiming at the difficulty of control and evaluation of main bearing deformation in the coordination design of the main bearing assembly structure for a high-speed diesel engine, taking MRD (the MRD means the maximum radial deformation of the bearing bush) of the bearing bush as an index to evaluate the out-of-round deformation of the bearing bush was proposed in this paper. The numerical calculation method of the MRD was given and the correctness of the method was experimentally verified. And the influence rules of different design parameters on the MRD were analyzed. On this basis, the coordination multi-objective optimization research of the main bearing assembly structure was carried out, and the optimization results were analyzed based on the influence rules of different design parameters on the reliability indexes. The results show that, when the pre-tightening force of the vertical bolt and the bearing bush interference are 240 kN and 0.17 mm respectively, the MRD reaches the minimum value. If the two values continue to increase, redundant loads can be generated, leading to the increase of the MRD. After optimization, the engine block strength coordination and bearing cap strength coordination had increased by 2.47% and 10.48%, respectively, and the deformation coordination and contact coordination had increased by 46.15% and 14.84%, respectively.

Coordination design of cadmium ions at the 4-fold axis channel of the apo-ferritin cage

Construction and X-ray structure analysis of Cd(ii) binding sites at the 4-fold symmetric hydrophobic channel of apo-ferritin by introduction of Cys residues.

Study on Application of BIM Technology in Structural Design of Constructional Engineering

Constructional engineering is the fundamental industry of China and along with the constantly improving of science and technology level in recent years, BIM technology has been gradually applied in constructional engineering feld of China, and it has exerted relatively sound application effects, thus actively proving the construction effciency and quality. In this study, mainly based on BIM technology, I analyze the application of BIM technology in structural design of constructional engineering respectively from feld data analysis, structure parameter design, interior design and professional coordination design, and analyze the application effects of BIM technology in structural design of constructional engineering by combining practical cases, which is expected to serve as the effective theoretical basis for the improvement of structural design of constructional engineering in China.