Design And Research Of A Multifunctional Nursing Bed

A type of multi-functional rehabilitation nursing bed is designed in this paper,which can effectively avoid the existing problems such as the imperfection of nursing bed function,bad man-machine integration,single function,high cost and so on.The following contents are included in this paper:Based on the ergonomic theory,referring to the human body size standards of Chinese adults,according to the pre-set functional requirements,the advantages and disadvantages of a variety of back-supporting mechanism,side-turning mechanism,leg-bending mechanism are analyzed.And a kind of hip-moving mechanism where patients can take the initiative to adjust the waist posture according to their own comfort level is designed.At the same time,based on the reasonable structure scheme implements,the main functions of the nursing bed are achieved.Establishing the corresponding kinematics model,with MATLAB realizing numerical simulation,ADAMS defining virtual prototype,through the synergy of kinematics analysis,its kinematics characteristics is verified.By contrastive analysis of the angular velocity and angular acceleration curves of the main mechanism obtained by the two methods,it is found that the motion process is relatively gentle and the trend is similar.Then,The dynamic and static analysis of the main mechanism of multifunctional rehabilitation nursing bed was carried out,rigid-flexible coupling dynamics simulation is carried out for key parts of each mechanism: the key parts are meshed by HYPERMESH,the material properties of the parts are defined and the flexiblity are achieved.Using the interface of HYPERMESH and ANSYS,the softened parts are imported into ANSYS.The rigid area is defined by Mass21 node,and mnf intermediate file is generated to replace the constrained rigid parts in ADAMS,so as to realize rigid-flexible coupling dynamics analysis.Then the WORKBENCH module in ANSYS is used for static analysis to prove that the strength of each institution meets the requirements.Finally,the topological optimization of back-supporting connecting rod is carried out in this paper.The HYPERMESH software was applied to achieve the optimal solution after 22 iterations with the density of structural elements as the design variable,volume response as the constraint and minimum flexibility as the design goal.The results show that the overall flexibility and mass of the optimized supporting link reduces by 61.9% and 22.4% respectively.According to the generated unit density distribution cloud diagram,PRO/E is used to improve the optimized back-supporting connecting rod,and then it is imported into ANSYS for static analysis,so as to verify the effectiveness of optimization.