The education mode of physics tournament based on OBE theory is designed and practiced, in order to cultivate the comprehensive quality of physics talents in all directions. The outcomes goals of the education mode consist of learning, innovation, practicing, communication, scientific spirit, and moral education. Teaching courses, evaluation methods and auxiliary supports are designed implemented to realize the all-round integrated teaching objectives. Through years of practice and exploration, it has been proved that this precise and real-time feedback education model can achieve sustainable and benign development, and has achieved remarkable educational results. This model has been adopted and implemented by many universities and middle schools, which has promoted the close cooperation and effective connection between middle schools and universities.

In this paper, the forced vibration of a steel string fixed at both ends under the action of an electromagnet with alternating current is studied. The spatial distribution of the magnetic field and the lateral force with a Gaussian distribution on the string are simulated, and the vibration of the steel string is calculated based on the non-homogeneous string vibration equation. At the same time, the vibration of string is observed and measured by a self-organized experimental device, and studied from three aspects: the waveform, vibration amplitude and vibration frequency of the forced vibration of the steel string. It is found that here is a stable “standing wave” mode in the waveform of steel string vibration driven by periodic electromagnetic force, and the vibration amplitude of the steel string is significantly attenuated when the driving force frequency deviates from the natural frequency of the steel string. The experimental results show that the vibration frequency of the steel string is twice the frequency of the alternating current of the electromagnet under certain conditions.