Research and application of variable DOF compliant five-bar mechanism based on novel compliant torsion joint in vehicle side door latch

In this paper, a novel compliant joint with torsion spring (CJTS) is proposed in order to realize the power release (Note: The “power release” feature means that the closure system with a latch assembly including a pawl-ratchet release mechanism is controlled by at least one electric actuator.) feature of the vehicle side door latch. A new type of variable degree of freedom (DOF) compliant five-bar mechanism (VDCM) based on the novel compliant joint is constructed. The novel compliant mechanism is characterized by multiple motion modes of planar five-bar mechanism and four-joint, crank-shaper, crank-oscillating block mechanism. These motion modes can be switched through the different choices of driving joints and limiting stoppers. This compliant mechanism is effectively implanted into a vehicle side door latch as a sub-branch to perform power release function. The force-adaptive characteristic of the VDCM ensures compatibility with extant manual release branches. Drifting displacement of the CJTS’s torsion spring rotation center in the groove is proposed as a compliant index to describe the compatibility and force-adaptive characteristics under various working modes. The relationship between torsion spring stiffness and mechanism characteristic point motion trajectory or position recovery time duration or motion accuracy is studied. The results show that the introduction of compatibility and force-adaptive characteristics is able to reduce the shaking forces exerted on the mechanism frame. The shaking forces will be further reduced by changing equivalent mass center position of the component. Furthermore, the practicability of the novel compliant mechanism is experimentally validated on the force-displacement test platform. The work in this paper provides a reference for the multi-mode motion mechanical design in a confined space of the latch.

Analysis on Two Basic Issues of Modern Hospital Management System

<p><em>In the process of promoting modern hospital management system, the two basic issues repeatedly thought and constantly researched are: what kind of modern hospital management system will be established and how to establish modern hospital management system. Seen from current status, modern hospital management system is arranged by public hospital system making modern hospital and management system match socialist market economic system, meanwhile, modern hospital management mode is also the target mode Chinese public hospitals constantly reform. Three comparatively outstanding features and requirements of modern hospital management are systematic power release, effective governance and scientific management. The features can be specified, that is to say, in the aspect of organization form, modern hospital management system belongs to one special public legal person system, power release of systematism is made by this system; From the aspect of system equipment, modern hospital management system includes one series of interrelated governance mechanism to conduct effective governance; From the aspect of management behavior, modern hospital management system means scientific, refined and professional management of public hospitals to realize the feature of scientific management. </em><em></em></p>