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来源：百度知道 编辑：UC知道 时间：2024/06/05 06:15:55
Repetitive control of tubular heat exchangers
The outlet temperature of the fluid inside the pipe is
often controlled by varying the temperature of the fluid
outside it. When no control over this process variable is
available, the velocity of the fluid inside it is used for temperature
control purposes. Previous work shows that in
both cases, resonance dynamics affect the outlet temperature
of the inner fluid [1,2]. Control system designs that
do not take resonance dynamics into consideration lead
to poor controller performance.
Several linear and nonlinear models [3–5] have been
developed to simulate the intrinsic dynamics of this type
of system. Linear models have the disadvantage of not taking
relevant heat exchanger issues into account. However,
nonlinear models based on physical equations are quite
complex, requiring tedious computation. Nevertheless,
there is an inte
Early 1970s: Prof. Dieter Seitzer of Erlangen-Nuremberg University in Germany begins wrestling with the problem of compressing music over phone lines. Initially refused research money to pursue the goal, he establishes a group of technicians and scientists interested in audio coding research to tackle the problem 。
1979: Prof. Seitzer's team develops a first digital signal processor capable of audio compression. During subsequent development, a student of Prof. Seitzer, Karlheinz Brandenburg, developed and enhanced basic principles for perceptual audio coding exploiting the hearing properties of the human ear as described in psychoacoustics. Under Seitzer's guidance, Brandenburg and the team continuously developed a number of coding algorithms.
1987: In1987 a research alliance is formed between Erlangen-Nuremberg University and the Fraunhofer Institute for Integrated Circuits within the framework of the European Union-funded EUREKA project EU147 for Digital Audio B