Observers are proposed as a solution algorithm for the inverse heal conduction problem (IHCP) of reconstructing a time-dependent surface heat flux at the boundary ofa linear heat conductor. The derivation of optimal observer equations JoUows directly from a novel inierpretation of the IHCP in the frequency domain: Solving the IHCP is viewed as a jilter design problem in which the reconstructed heat flu:c is obtained by low-pass jiltering of the true heat flux. It is demonstrated that observers art easier to tune, yield a better trade-off between tne deterministic bias and the sensitivily to measurement errors, and lead to smaller-size compulJJlionalproblems than other soluiion approaches.
Abstract-For the evaluation of the acoustic performance of electrical machines in variable operating conditions, a real-time auralization procedure applicable in virtual reality environments is developed. Electromagnetic forces, structural dynamics and acoustic radiation as well as room acoustic aspects are considered. The combination of electromagnetic simulation with a unitwave response-based approach and a room acoustic virtual environment software allows for an efficient implementation. Simulation results are shown for two different types of electrical machines-one induction machine and one permanent magnet synchronous machine. Practical experiments are used to finetune and validate the numerical models.
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