Prima Erfido Manaf(J2D009030)

Endriasmoro M.(J2D009029)

Arga Brahmantyo (J2D009027)

Nur Rachmaningtias (J2D009026)

Damping Tools Geopsy

By 4 th Group

Agnis Triahadini(24040110120026)

Function

.

identifying pollution by continuous,

monochromatic signals

Advanced signal

processing toolbox

identifying industrial vibration sources

Background Parameter

Damping Ratio is a parameter representing the energy loss of an

oscillating system.

The loss can be either internal (material damping) or another system (radiated

damping)

The Damping toolbox is used in Geopsy after detecting peaks in

the Power Spectrum or the Structure spectrum

In this presentation we don’t explain both of them, therefore we will turn to the next step directly

Practical Use

After choose damping tools,damping toolbox will appear

Damping ratio toolbox

The Damping toolbox is divided into 3 parts:

Filter Time Limits

Parameters of the Random

Decrement technique

Filter

Filtering can be activated by checking Filter signal before processing. Applying a

narrow band filter is generally necessary in order to select the frequency band of the interesting peak, since other peaks are

generally existing in the spectrum

Time Limits

The time limits define the signal range on which the Random Decrement

Technique is applied. Options for Time Limits are defined in the corresponding

section

Parameters of the Random Decrement technique

In Geopsy, two parameters can be customized to compute the damping ratio using the Random Decrement technique:

Window Length Fitting Length

Result

Each graph includes 1 layer with 4 lines representing

solid black line dashed black line solid red line

In an oscillating structure like a building, the damping ratio generally ranges between 1 and

10%. Slightly lower values are possible for slender structures. Higher damping cannot

generally be detected in recordings because of too low energy.

Thank You