Anders Buen

9 Questions 161 Answers 0 Followers

Questions related from Anders Buen

How large is the black distance noted with a question mark?

How far is the distance with question marks on it? There is a river, where you measure at the point out to the right and there is a low screen. The river is green, what is visible is within the...

25 July 2024 4,364 1 View

What distance loss, or flanking sound, can be expected along and across large steel TRP plates?

I am working on reuse of a 80 m x 40 m plus hall with TRP plates, both running along and across a separating wall. We do have sound insulation measurements from an office building indicating...

25 November 2023 8,116 0 View

How can a color map with a color scale be translated to numbers?

In violin restoration and research some do send instruments through MR or CT machines and get information on eg plate thicknesses and body shapes. I would like to extract number values from such...

09 April 2023 1,749 0 View

What are typical shear and longitudinal viscosities of rubber or foam rubber materials used in vibration insulation?

Harrison, Sykes and Matins article «Wave effects in Insulation Mounts» in JASA from feb 1952 give models and measurement results for vibration insulation transfer curves showing more than one...

25 March 2023 4,692 2 View

Will the hysteresis stress strain curve of rubber and rubberlike materials lead to formation of harmonics and other non linear phenomena?

The stress strain curve of rubber is not linear and follows a curved line both as the strain increases and as it decreases again. Does this hysteresis lead to formation of harmonics or other non...

25 February 2022 997 5 View

What mode shapes can we expect in an impact sound laboratory concrete floor?

The concrete test floor in an impact sound laboratory, usually 140-150mm, is usually resting on a rubber or something else resilient and sealing, sort of a thick "gasket". The plate thus has to...

16 May 2021 4,084 4 View

Which modulus of elasticity to use for impacts between medium speed objects? The Dynamic or static modulus of elasticity?

I guess for calculating impact parmaeters like maximuym force, impact time and maximum deflection for slow impacts the stiffness derived from the static youngs modulus applies. But what about semi...

15 July 2020 9,187 2 View

Does wood show fatigue or failure from vibrations like metal does?

Violins does not develop cracks from vibration, but mainly from humidity cycling, gradients and tension buildup from swelling or shrinking from natural variation in the indoor climate. The oldest...

23 June 2020 6,708 15 View

WIll conservation of impulse from weight drops on floors with mats lead to a higher low frequency vibration level in the floor slab?

Weight drops generates vibrations in the floor they hit. Impulse mdv must be conserved, even if the floor or mass is cushioned with mats. Cushioning leads to less high frequency content in the...

18 February 2020 9,960 3 View