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Moreover , the influence of altering the degree of freedom of nodes , caused by additional struts , on mechanical performance and energy absorption capacity is systematically investigated by theoretical modeling , experimental characterization and finite element method .
 struts, mechanical, energy absorption capacity, theoretical, modeling, experimental, finite element method
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 struts, mechanical, energy absorption capacity, theoretical, modeling, experimental, finite element method