Abstract: I want to do a special mention related to the activity of professor Aurelian Stan in the field of acoustics, particularly about the activity as scientific secretary, vice-president and president of the Commission of Acoustics of the Romanian Academy.
The activity of scientific research of professor Aurelian Stan consists of over 200 books, studies, papers, communications, yielding original contributions in the domain of acoustics: noise control and vibrations at ships, elevators and in the textile industry; acoustics treatment of the industrial places; using the noise absorbing ceilings; acoustics of the performance halls, particularly, acoustics of the National Theatre Hall; study of the noise produced by town traffic, particularly in Bucharest; papers useful in military area, in the domain of infrasound, vibrations of the pipes of anti-aircraft guns, acoustics of underwater for the detection of the submarines, etc.
I have always been impressed by the care of professor Aurelian Stan concerning the elaboration of the 30 volumes of scientific communications made at the annual sessions of this commission, from 1972 until 2002, so modestly named “Note-Books of acoustics”. I admired him examining very carefully every communication separately, the way he talked to the author, often a young and less experienced person in the technique of elaboration and he used to give useful advice to this youth. I know he would not have accepted any communication if it had not met the exigencies of a publication of the Romanian Academy.
For special scientific results, in 1943, the professor Aurelian Stan was elected corresponding member of the Romanian Academy of Science, an academy founded in the ’30 and functioned parallel to the Romanian Academy.
In 1993, on 23rd of March, he was elected member of honour of the Romanian Academy. In 1995, professor Aurelian Stan founded The Romanian Acoustical Society, he being among the founding members. In 1997, he became founding member of the Academy of Technical Sciences in Romania (ASTR). His activity was appreciated especially by some prestigious scientific societies from abroad. Thus, in 1974 he was elected member of the Group of Acousticians speaking French Language (GALF).
In 1976, he became member of the European Acoustics Society (FASE), being elected vice-president of this prestigious society in 1982. Let’s add to all these the fact that in 1979 he was awarded the silver medal of the French Acoustics Society and in 1980, this society conferred him the title of member of honor.


Brief Biography of the Speaker:
Graduated in the year 1946 the Polytechnical Institute of Bucharest, where he distinguished himself as an eminent scholar in theoretical mechanics, resistance of materials, dynamics and construction stability.

His scientific research includes approach to problems of theoretical mechanics, mechanism theory, elastic and dynamic stability, but also contributions, as a national first and with notable results on an international level, to fields such as chaos theory, fractal problems, dynamic systems’ theory, etc. From his original contributions of widespread acknowledgement there are noted: „The Sufficiency of the Virtual Mechanical Work Principle”, introducing the concept of „Critical System” along „Olonome and Unolonome Systems”, „Distribution of Acceleration in the Relative Movement of the Rigid”, „The Method of Independent Cycles”, „Positional Analysis of Mechanisms”, „Cinematic Couples Synthesis”, „The Effects of Coupling very different Rigid Structures”, „The Dynamic of Vehicle Suspension”, „The Vibration of Rotors in non-inertial Systems”, etc.

In 1963 he was elected correspondent member and in 1974 title member of the Romanian Academy. In 1972 he obtained the title of Professor Emeritus and in 1974 that of Scientist Emeritus. Since 1997 is a founding member and President of the Romanian Academy for Technical Sciences. Starting in 1992, has taken on the role of General Director of the Romanian Space Society. He is the President of the Acoustics Commission of the Romanian Academy.