구조물 지진 진동측정기 3D strong-motion accelerometer suricat

구조물 지진 진동측정기 3D strong-motion accelerometer suricat

 

영신컨설턴트 (02) 529 8803 2018 .7

All-in-one digital recorder

 

크기 15 x 8 x 6 cm,

저장크기 16 Gb storage capicity

Internal battery (90 minutes autonomy)

 

◆3 accelerometric channels x, y, z: 0.15 mg (full scale ±2 g)

or 0.45 mg (full scale ±6 g)

◆ Samplig rates 128, 256, 512 Hz on all channels

◆ Internal computer (1,4 GHz, 64-bit quad core ARM), Linux OS

◆ Time synchronization via GPS module (with external antenna)

or via NTP (Network Time Protocol)

◆ Data transmission in real time via internet using the seedlink protocol (SeiscomP3 compatible)

◆ Data downloading post-recorded via internet (web interface)

or in direct connection using the Ethernet port

◆ GPS antenna

◆ Power supply cable

용도 구조물의 지진 계측

구조물의 지진전, 지진시, 지진 후 계측

3 성분 중 1 방향 주파수

Acquiring the key parameters of ground and structure motion during earthquakes or other excitations, in real time, is an increasing demand.  

Suricat is a cost-effective 3D strong-motion accelerometer designed for permanent monitoring of structures: precise enough to provide information of engineering interest, economical to be employed in extended networks.

x y z 방향 진동 측정

Technical Specifications

 

4 channel acquisition system:

3 accelerometric channels (x,y,z)

1 analog channel

 

Sensitivity:

accelerometric channels: 0.25 mg (scale: 2g) or 0.75 mg (scale: 6g)

auxiliary channel: 1V

 

Sampling frequency: 16 kHz original on all channels

256 Hz, 512 Hz or 1024 Hz output

Synchronization among different units:

 

GPS (external antenna)

NTP (network time protocol)

Data access: via Ethernet (CAT 5)

wireless (Bluetooth or WiFi)

 

Power supply: Ethernet (Power Over Internet)

internal battery

DC plug-in (5V)

General Description

 

SURICAT is a compact device designed to record acceleration along 3 orthogonal axes. The sensitivity of 0.2 10-3 g is achieved through the use of several sensors per axis and of averaging techniques.

Acceleration time-series can be acquired continuously on 3 channels (x, y, z), while a fourth auxiliary analog channel allows the simultaneous recording of external events.

 

SURICAT is endowed with a GPS module (with internal or external antenna) that allows the synchronization of different units.

 

SURICAT is powered and sends data through the Ethernet connection (POE, Power Over Ethernet). When this is not present, SURICAT still records the data and stores them in the internal memory, waiting to be transmitted as soon as the network is operative again.

 

If Ethernet connection is without POE, SURICAT can be powered through its own external power supply 5V DC.

 

SURICAT has an internal lithium ion battery, with an autonomy of a few hours, and can store data in the internal microSD card for several days.

 

SURICAT can also transmit data through wireless systems. In this case it should be powered from external sources in order to prevent data loss, since its internal lithium ion battery has a limited autonomy.

Purpose

 

The main application of SURICAT is structural monitoring (e.g., measuring the response of structures to strong motions like earthquakes and compare the pre-syn-post event response). SURICAT is designed to be used by qualified personnel only, like geologists, geophysicists, civil engineers, specifically prepared to understand the meaning of the input and output data.

 

Use Setup

When employed for structural monitoring, it is recommended to level and screw the SURICAT case to the floor (or wall) at the desired location in order to have a stable recording position and coherent results over time. Four holes are present at the corners of the case to allow this operation. Moreover, a metallic U shaped square is also supplied for this purpose.

 

Switch-on

To turn SURICAT on, click the on/RESET button on the side panel. SURICAT can also be turned on by plugging-the Ethernet cable. If the Ethernet switch does not support the POE system, provide a 5V DC, 1A power supply.

 

 

The meaning of the LED present on the main side of SURICAT is (Figure 1):

- POWER SURICAT is powered (through POE or DC)

- RECHARGE the internal lithium ion battery is charging

- on SURICAT has been turned on

- EVENT [future applications]

- ERROR error message

 

The boot phase of the internal microprocessor takes approximately 1 minute: wait until the first BEEP. During the boot phase, the ERROR and EVENT LEDS are red.

After a few more seconds (required to get the time stamp from the GPS or NTP), a double BEEP indicates that SURICAT has started acquiring the data from the sensors. The ERROR and EVENT led turn off.

If the Server Network is enabled, SURICAT periodically sends a message of its presence to a server. This option is disabled by default and can be modified.

 

Error management

If the ERROR LED does not turn off, reboot the system by keeping the on/RESET button pressed for 8-10 seconds (forced shutdown). The RESET is located on the SURICAT side panel opposite to the Ethernet connector.

 

Switch-off

Click the on/RESET button for 2 seconds during the acquisition. This starts the shutdown, which takes about 10 seconds and is marked by a beep when completed.

Querying SURICAT

 

During the acquisition SURICAT can be queried through the network. Type the SURICAT IP address in the usual internet browser: the live-recordings will be displayed and a number of configurations (data download, visualization etc.) can be set (Figure 2).

 

A summary of the main functions is reported in the following section.

 

 

 

Main software functions

To identify the IP address of SURICAT, run suricatbroadcast.exe (Windows OS) or suricatbroadcast (Debian Linux OS). A list of the SURICAT devices present in the examined local network appears, with the corresponding IP address (localhost label) to be annotated.

Type the desired IP address in the web browser address bar. A page displaying the real-time recordings and a main menu will appear (Figure 2), with the following functions:

 

- Home returns to the main page (real-time traces)

- Info device information and Ring Server status

- Data list of the acquired traces and data download (TRC file format compatible with Grilla)

- System configuration window

 

To explore the Data and System menus, enter the username (suricat) and password (suricat), which can be modified from the System >> Account menu.

    

From the Info menu. This window allows to display device data and Ring Server status (Figure 3).

Download to download the last 100 recordings (1 record per hour at 128 sampling rate). Files are in TRC format to be used with Grilla software. Logout to close the session

      

From the System menu. It allows to turn the system off, reboot it and identify the device through a BEEP sound and an EVENT led flash. It also allows to choose a header title and footer notes for the main screen. It has these following menus (Figure 5).

Server to display the server status

Channel to modify acquiring sampling rate: press “Stop acquisition”, choose a new frequency and press “Save”. Then, press “Start acquisition” to begin a new acquisition.  Label to edit the device labels

Host to switch the IP address between dynamic (DHCP) and static

GPS to enable or disable GPS and view the GPS status

Time to display the SURICAT time and synchronize it with different sources (GPS or NTP)

Account to change the password

Upload to upload new versions of the software and to change the logo displayed on the top-right corner of the web page (only .png file format is acceptable)

Logout to close the session

 

Example of standard setting for long-term monitoring

 

1. Set the static IP address from the System >> Host menu. Select “Static” and fill the form, then press “Save” and confirm the change,

2. Verify that the Ring Server is running (default setting). Go to System >> Server and check that the corresponding LED is green. Note that the available ports are 16000 and 18000,

3. Verify that the GPS is working (default setting). Go to System >> GPS and check that the corresponding LED is green. If the GPS antenna is connected and receives the GPS signal, the panel displays the GPS data (coordinates, date…),

 

4. Check the time synchronization. Go to System >> Time, check the GMT time and that the time LED is green (or yellow). All the possible synchronization sources are displayed here. If the GPS antenna is connected, this will be used by default. If the GPS signal is not available, the NTP (or the OS time if the NTP server is not available) will be used by default.