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This paper presents a novel design approach to systematically synthesize available configurations for dedicated hybrid transmission (DHT) systems subject to design constraints and required operation modes by using simple planetary gear sets (PGSs). The configuration synthesis process includes two main steps. The first step is the synthesis of the PGSs by synthesizing all the components to a simple PGS subject to the design constraints. The second step is to combine the structural and shift elements into all configurations and detect those meeting the requirements with the mechanical and operation mode constraints. By applying the proposed design approach, the configurations of the Toyota’s hybrid systems (THSs) and Voltec-II prove the feasibility of the method. Furthermore, several new DHT configurations are synthesized under the new design conditions. The proposed design approach is capable of systematically synthesizing new DHT systems with multiple PGSs, variable design constraints, and expected modes.

Planetary gear sets (PGSs) have been widely used in automatic transmissions (AT) and dedicated hybrid transmissions (DHTs). In this paper, a novel isomorphic detection method for planetary gear transmission structure is proposed based on matrix operation. The isomorphic detection process includes two main parts. In the first part, various components of the transmission structure are classified. In the second part, isomorphic structures of the numerous structures are detected. Through the application of the proposed detection approach, the structures obtained by different synthesis algorithms can be greatly reduced. Furthermore, by the analysis and transformation of the hybrid configuration to conventional transmission configuration, the scope of use of the algorithm can be expanded through the method. The proposed detection approach is capable of automatically detecting the isomorphic structure of the potential structures obtained by synthesis algorithm.

Data mining has become an important means to improve the level of educational management under the background of big data. In this paper, the CART decision tree algorithm of data mining is applied to the performance management of college teachers. On the basis of statistical data, the factors affecting teaching quality such as teaching attitude, teaching methods and teaching preparation are taken as decision attributes to construct a decision tree. The specific construction process of CART decision tree algorithm in teaching performance evaluation of university teachers is illustrated by examples, and the classification model of teaching performance based on CART tree is generated. It is found that teachers who are fully prepared for teaching often show good teaching attitudes and better teaching performance. For the staff with good teaching quality but low teaching preparation score, if they have good teaching means or good teaching attitude, their teaching performance will be higher; If the teaching method is not skilled or the attitude is not good, the performance is average. It can be seen that teaching performance and teaching quality, teaching preparation, teaching means and teaching attitude are mutually restricting and influencing each other. Finally, targeted and reasonable performance evaluation suggestions are put forward.

Planetary gear set (PGS) has been publicly recognized as one of the best components to constitute a transmission configuration, which includes the dedicated hybrid transmission (DHT). By using different synthesis approaches, how to eliminate the schemes with mechanical interference becomes the key to restrict the development of the synthesis approach. Therefore, this paper presents a novel modeling method to systematically remove the interference structures, with graph theory in the process of structural synthesis. This paper proposes a general modeling approach, which has some merits to the existing ones, to represent the scheme of PGS-based transmissions. By applying the proposed detection approach, an DHT transmission proved. The proposed detection approach is capable of systematically detecting all the PGS-based transmission with multi-PGSs, multi-shifting elements, and multi-power sources.