摘要：To improve the efficiency and amplify the exciting force of a shake table,a novel variable stiffness mechanism(VSM)constructed by four leaf spring-lever combinations(LSLCs)was *** VSMs were installed in parallel on the traditional hydraulic shake table to constitute a resonant shake table(RST).The static model of the VSM and the dynamic model of the RST were constructed by considering the large deflection of leaf springs and the geometrical nonlinearity of L-shaped *** variable stiffness property of LSLCs was analyzed and verified through static *** simulation and vibration experiments on the dynamic properties of the RST prototype were *** results show that compared with traditional shake tables,the RST consumes lower exciting force in a specified frequency bandwidth when outputting the same displacement of *** a harmonic vibrational excitation,the RST is effective for vibration enhancement using broadband frequency resonance and can save energy to some *** broadband resonance technology exhibits considerable potential in practical engineering applications.

摘要：Passive variable stiffness joints have unique advantages over active variable stiffness joints and are currently eliciting increased *** passive variable stiffness joints rely mainly on sensors and special control algorithms,resulting in a bandwidth-limited response speed of the *** propose a new passive power-source-free stiffness-self-adjustable mechanism that can be used as the elbow joint of a robot *** new mechanism does not require special stiffness regulating motors or sensors and can realize large-range self-adaptive adjustment of stiffness in a purely mechanical *** variable stiffness mechanism can automatically adjust joint stiffness in accordance with the magnitude of the payload,and this adjustment is a successful imitation of the stiffness adjustment characteristics of the human *** response speed is high because sensors and control algorithms are not *** variable stiffness principle is explained,and the design of the variable stiffness mechanism is analyzed.A prototype is fabricated,and the associated hardware is set up to validate the analytical stiffness model and design experimentally.