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In this paper, a compliant parallel mechanism is proposed as a bionic torso to simulate the diversified behaviors and agile locomotion of the tetrapod torso. The spring module is incorporated into the limb of the parallel mechanism to absorb external shocks, cushion, and dampen vibrations, thus improving the compliance performance of the bionic torso. For the compliant parallel mechanism, its kinematics and kinetics are analyzed, and the overall electromechanical system and control framework are devised. The multidimensional damping dynamic characteristics of the proposed mechanism are qualitatively analyzed by simplifying the limb into a spring\u2013mass damping system. The parallel mechanism with compliant spring modules absorbs external forces to different degrees with different stiffness coefficients to avoid damage to the structure by external impacts. The parallel mechanism with different initial positions exhibits the inherent variable stiffness characteristics of the mechanism. The parallel mechanism simulates the diverse behavior of the animal torso, with independent and synthesized locomotor behavior of the six underlying motion patterns. Simulations and experiments demonstrated that the compliant parallel mechanism is effective in vibration damping and cushioning, with a rapid response and small steady-state error. The motion of the compliant parallel mechanism in one direction and the motion of the integrated multi-degree of freedom (DOF) are confirmed and exhibited in the behavioral experiment.<\/jats:p>","DOI":"10.1177\/01423312231174558","type":"journal-article","created":{"date-parts":[[2023,5,22]],"date-time":"2023-05-22T01:53:10Z","timestamp":1684720390000},"page":"167-182","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["Modeling and control system design of 6-DOF bionic parallel mechanism with compliant modules"],"prefix":"10.1177","volume":"46","author":[{"given":"Ruyue","family":"Li","sequence":"first","affiliation":[{"name":"Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang\u2019an University, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9103-4211","authenticated-orcid":false,"given":"Yaguang","family":"Zhu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang\u2019an University, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuangjie","family":"Zhou","sequence":"additional","affiliation":[{"name":"Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang\u2019an University, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhimin","family":"He","sequence":"additional","affiliation":[{"name":"Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang\u2019an University, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junli","family":"Sun","sequence":"additional","affiliation":[{"name":"Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang\u2019an University, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shaokui","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Road Construction Technology and Equipment, Ministry of Education, Chang\u2019an University, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2023,5,21]]},"reference":[{"key":"bibr1-01423312231174558","doi-asserted-by":"publisher","DOI":"10.1111\/j.1469-7998.1985.tb04944.x"},{"key":"bibr2-01423312231174558","unstructured":"Boston Dynamics (2018) CHEETAH\u2014Fastest legged robot. 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