Control Design for Systems Operating in Complex EnvironmentsView this Special Issue
Corrigendum to “A Review on the Control of Second Order Underactuated Mechanical Systems”
The article titled “A Review on the Control of Second Order Underactuated Mechanical Systems”  was found to contain material from published work, which was not cited. The earlier article is as follows:
Yang Liu and Hongnian Yu, “A survey of underactuated mechanical systems,” IET Control Theory & Applications, vol. 7, no. 7, pp. 921–935, 2 May 2013, doi: 10.1049/ietcta. 2012.0505 https://ieeexplore.ieee.org/document/6562926/ .
Figures 1–6 are conceptually the same as Figures 1–4 and 5–7, respectively. Table 1, showing the equations of motion for underactuated mechanical systems, is the same as Table 1 in the earlier article. The same eight examples of underactuated systems are shown in Section 2 and Section 2.2 in the earlier article. Section 3 and Section 2.1 are similar, and the titles of Sections 4 and 5 versus Sections 3 and 4 are the same: “Classification of Underactuated Mechanical Systems” and “Control of Underactuated Mechanical Systems” versus “Classification of UMS” and “Control of UMS.” The contents of Section 5 in both articles are similar, and Section 6.1 on “Intelligent Controller (Fuzzy Logic)” is similar to Section 4.4 on “Fuzzy Control” in the earlier article.
The authors apologize for this.