Design and implementation of electronic circuit virtual laboratory based on virtual reality technology

Virtual reality technology has been applied in virtual labs and remote experiment teaching. This paper designs an electronic circuit virtual laboratory based on virtual reality technology, and relevant experimental teaching content. The system uses Unity 3D and 3ds max tools to build a three-dimensional model of general instrumentation, electronic components, and laboratory scenes in electronic circuit experiments. The C# is used to develop general virtual instrumentation functions and electronic circuit simulation, the electronic circuit virtual reality laboratory based on VR equipment was realized. We have developed VR electronic circuit virtual laboratory on PC and web. Students can use VR electronic circuit virtual laboratory to learn basic electronic circuit knowledge and carry out electronic circuit virtual experiment immersively.

Asynchronous parametric excitation: validation of theoretical results by electronic circuit simulation

A validation of recent theoretical results on the stability effects of asynchronous parametric excitation is presented. In particular, the coexistence of both resonance and anti-resonance at each combination resonance frequency is to be confirmed on a close-to-experiment simulation model. The simulation model reproduces the experimental setup developed by Schmieg in 1976, remaining the only experimental study on asynchronous excitation to this day. The model consists of two oscillating electronic circuits with feedback-free coupling through parametric excitation. In contrast to a mechanical system, the phase relations of the parametric excitation terms in an electronic system can be easily adjusted. The implementation of the simulation model is performed in the electronic circuit simulation software LTspice. The electronic model itself is first validated against the experimental results obtained by Schmieg and is then used to confirm the theoretical findings. The results of the electronic circuit simulation show excellent qualitative and quantitative agreement with analytical approximations confirming the coexistence of resonance and anti-resonance effects near a combination resonance frequency.

A New Chaotic System with a Pear-shaped Equilibrium and its Circuit Simulation

This paper reports the finding a new chaotic system with a pear-shaped equilibrium curve and makes a valuable addition to existing chaotic systems with infinite equilibrium points in the literature. The new chaotic system has a total of five nonlinearities. Lyapunov exponents of the new chaotic system are studied for verifying chaos properties and phase portraits of the new system are unveiled. An electronic circuit simulation of the new chaotic system with pear-shaped equilibrium curve is shown using Multisim to check the model feasibility.

A New Four-Scroll Chaotic System with a Self-Excited Attractor and Circuit Implementation

This paper reports the finding a new four-scroll chaotic system with four nonlinearities. The proposed system is a new addition to existing multi-scroll chaotic systems in the literature. Lyapunov exponents of the new chaotic system are studied for verifying chaos properties and phase portraits of the new system via MATLAB are unveiled. As the new four-scroll chaotic system is shown to have three unstable equilibrium points, it has a self-excited chaotic attractor. An electronic circuit simulation of the new four-scroll chaotic system is shown using MultiSIM to check the feasibility of the four-scroll chaotic model.