diff --git a/README.txt b/README.txt
deleted file mode 100644
index d179193..0000000
--- a/README.txt
+++ /dev/null
@@ -1,83 +0,0 @@
-Congrats !!
-
-* You have successfully downloaded and extracted the
- ui.tgz .
-
-
-* Changes: New Tabs have been added for
- - Target Audience
- - Courses Aligned
- - Pre-requisite Softwares
-
-You need to added 3 more sections on virtual lab home page
-
-3) Target Audience
-4) Courses Aligned
-5) Pre-requisite Softwares
-
-You can make the above said changes by editing content.html. To update the changes
-
-1) open content.html in your fav editor and search for last closing html tag .
-2) Open the change.html file and open it in your fav. editor.
-3) Copy all content of change.html
-4) Paste it after the last closing html tag (you searched in Step1).
-5) Go to ui/src and run " make theme=blue-icon" on command terminal to change theme to blue
-
-
-We had attached change.html in folder. You can copy the whole content and paste it in content.html .
-
-
-Below is snapshot how content.html will look like
-
-
-
-
-Adobe flash player is the only application that allows you to browse
-multimedia content like animations, flash games, videos,
-advertisements, rich media content etc. Adobe flash player is designed
-to support all the operating systems like windows, MAC, linux,
-solaris, android etc.
-
-
-
-
-
-
1.1 For Linux
-
-
-
-
-
-
-
-
1.1.1 GUI ( Graphical User Interface ) Installation
-
-
-
-
-
Auto Installation
-
-
-
Go to Ubuntu software center. Type Adobe flash plugin in the search
- box ( Top right ). You can see the Adobe flash plugin in the list.
-
-
Just press install and wait for the installation to complete.
-
-
After installation you can view multimedia content in your browser.
-
-
-
-
-
-
-
-
Manual Installation
-
-
-
Go to http://get.adobe.com/flashplayer/ and select the version of
- flash player suitable for your system to download. This will download
- a tar.gz plugin in your Downloads folder. b. Unpack the plugin tar.gz
- and copy the files to the appropriate location. c. Once unpacked, you
- will get a directory named usr and a file named libflashplayer.so .
-
-
Open terminal, switch to root account and copy this
- libflashplayer.so file to /usr/lib/mozilla/plugins.
-
-
-
-
Restart the browser and flash will be activated for mozilla.
-
-
- For other browsers, identify the location to put plugins and copy this
- libflashplayer.so file to that location.
-
-
-
-
-
-
-
-
-
-
-
-
1.1.2 CLI ( Command Line Interface ) Installation
-
-
-
-
Before starting the installation, the repository needs to be updated:
-
-
-
-
sudo apt-get update
-
-
-
-
After updating the repository, you can install Adobe flash player
- in a single command:
-
-
-
-
sudo apt-get install flashplugin-installer
-
-
-
-
All in one command ( Alternative ) Alternatively the following
- command will install all the multimedia plugins and libraries that
- needed to play mp3 and video formats. This command will install
- adobe flash player too:
-
-
-
-
sudo apt-get install ubuntu-restricted-extras
-
-
-
-
-
-
-
-
-
-
-
-
-
1.2 For Window
-
-
-
-
-
Go to http://get.adobe.com/flashplayer/ and select the version of
- flash player suitable for your system. The Flash Player installer
- should prompt to begin installation after the download is
- complete. If it does not, start the installer directly from
- Downloads folder.
-
-
After downloading Flash Player, close all open browsers.
-
-
Locate the install flash player file. Unless you have specified otherwise, the file is saved in your Downloads folder.
-
-
Double-click the installer file to begin the Flash Player installation.
- This will install flash on your system.
-
Click on the openjdk-6-jre or openjdk-7-jre package.
-
-
A new tab will open asking for default launching application.
-
-
Open it with Ubuntu Software Center.
-
-
Ubuntu Software Center will ask for some Optional add-ons.
-
-
Tick the option for Icedtea Java Plugin and apply the changes.
-
-
Click on install to install Java and Icedtea plugin.
-
-
-
-
-
-
-
-
-
1.1.2 CLI ( Command Line Interface ) Installation
-
-
-
-
Installing Default JRE/JDK
- This is the recommended and easiest option. This will install OpenJDK
- 6 on Ubuntu 12.04 and earlier and on 12.10+ it will install OpenJDK 7.
-
-
Installing Java with apt-get.First, update the package index:
-
-
-
-
sudo apt-get update
-
-
-
-
Then, check if Java is not already installed:
-
-
-
-
java–version
-
-
-
-
If it returns “The program java can be found in the following
- packagesâ€, Java hasn't been installed yet, so execute the
- following command:
-
-
-
-
sudo apt-get install default-jre
-
-
-
-
This will install the Java Runtime Environment (JRE). If you
- instead need the Java Development Kit (JDK), which is usually needed
- to compile Java applications (for example Apache Ant, Apache Maven,
- Eclipse and IntelliJ IDEA execute the following command:
-
-
-
-
sudo apt-get install default-jdk
-
-
-
-
-
-
That is everything that is needed to install Java. All other
- steps are optional and must only be executed when needed.
-
-
-
-
Installing Icedtea plugin
- IcedTea-Web is a free software implementation of Java Web Start and
- the Java web browser plugin. To install, execute the following
- command:
-
-
-
-
Click Free Java Download to save the set-up file to your computer.
-
-
Click Save for the file in downloads bar to confirm that you want to
- download the file.
-
-
Open the set-up file. Follow the instructions onscreen to finish
- installing Java.
-
-
-
-
-
-
-
-
-
-
1.3 Browser Settings
-
-
-
If your Java application is blocked on the browser because of the
- security guidelines implemented in Java. By changing the security
- settings we can fix this issue, please follow these steps mentioned
- below
-
-
Go to Java Control Panel
-
-
Double click on Java
-
-
Open the Security tab
-
-
Select Medium
-
-
Click on Apply
-
-
-
-
Restart your web browser Even then if it does not work follow these
- steps to Add URLs to the Exception Site list
-
Java 3D is a scene graph based 3D application programming interface
- (API) for the Java platform.
-
-
-
-
-
1.1 For Windows
-
-
-
-
Download the latest version of jre (“1.7 versionâ€) and Java 3d
- package (“1.5 versionâ€) from www.oracle.com.
-
-
Also enable jre on your browser.
-
-
Java 3d package contains three jar files: j3dcore.jar, j3dutils.jar
- and vecmath.jar. Add these to your classpath. It also contains
- dynamic libraries for OpenGL graphics. You should add the directory
- containing these to your LD_LIBRARY_PATH.
-
-
Now set the class path. In Windows you set these with
- Start -> Settings -> Control
- Panel ->System -> Advanced -> Environment Variables. Then create or
- edit your CLASSPATH and LD_LIBRARY_PATH so that they include the
- locations of the Java 3DÂ files you downloaded. For example, if you
- have saved the files to C:/java3d, you should add
-
-
C:/java3d/lib/ext/j3dcore.jar;
-
-
C:/java3d/lib/ext/j3dutils.jar;
-
-
C:/java3d/lib/ext/vecmath.jar to your CLASSPATH and
-
-
C:/java3d/j3d/bin to your LD_LIBRARY_PATH.
-
-
-
-
Restart your browser and you should be able to see the applets that
- use Java 3D.
-
Welcome! This manual guides you through the
- process of assembling your virtual lab's content
- using the ui template .
-
-
-
- If you are reading this help after a local
- installation, then you have probably already
- installed the ui template and you can skip this
- section. If you are reading this from the web,
- then you need to do the following steps to
- install the template.
-
-
-
Downloading ui.tgz
-
- The first step in the installation is the downloading of the ui template.
-
-
-
-
Download
- the ui.tgz
- file from this link ui.tgz
-
-
-
Unzip the file. This should create a
- directory ui/
-
-
-
-
-
-
-
-
-
-
-
-
- ui directory
-
-
-
-
-
-
- The ui
- has
- src and
- scripts directory inside it.
-
- The ui/
- directory has the following file
- structure:
-
-
-
-
-
-
-
- ui/src/lab/
-
-
-
-
All the source files for
- the lab are here. The files
- index.html
- and
- default.html have been
- made read only as these need
- not be edited.
-
-
-
-
- In case you want to edit the
- html pages, you should edit
- only the
- content.html file in
- ui/src/lab/
- and the
- ui/src/lab/exp1/ directory.
-
-
-
-
- While adding new experiments,
- make sure you create new
- directories following the same
- structure under
- ui/src/lab/"EXPERIMENT-ID"
- and change the
- content.html in the
- same directory. Make sure inside
- the
- ui/src/lab/"EXPERIMENT-ID"
- directory, the files
- index.html
- and
- default.html are not edited.
-
-
-
-
- In addition, the
- ui/src/lab directory
- contains js,
- images, and
- css
- directories. These directories
- are there to hold your own
- custom files.
-
-
-
-
-
-
-
- ui/src/lib/
-
-
-
-
- All the library files (like
- MathJax, jQuery, modernizr)
- are in this directory.
-
-
-
-
-
-
-
- ui/src/themes/
-
-
-
-
- Two themes are supplied
- with this release.
-
-
- * maroon-grid (uses iiith style, which does
- not display icons)
-
-
- * blue-icon (uses the iitb
- style, which uses icons for
- sections) Of course,
- you are free to design your
- own theme, and place it in the
- themes directory.
-
-
-
-
-
-
- ui/src/makefile
-
-
-
-
- This file is used for building a release
- (described below).
-
-
-
-
-
-
- ui/scripts/
-
-
-
-
- This directory has the shellscript
- transfer.sh.
- This file has to be run when the
- user wishes to test his lab
- on the test or deployment server.
- Run the file from the
- ui/scripts
- directory using the following command:
-
- USERNAME-ON-DEVEL is the login name for the
- developer on
- devel.virtual-labs.ac.in and
-
- OPTIONAL NAME-OF-THEME is an optional
- parameter which could be maroon-grid or
- blue-icon or your own
- theme name.
-
The -F option is meant for building
- to the deployment server. For detailed help on
- transfer.sh
- , please refer to the
- BUILD section.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Build
-
-
-
-
-
- The build process is completed with the
- following three milestones.
-
-
-
Build 1 : Local build
-
-
- The purpose of the local build is to be
- able to view the content locally.
- Once you run the makefile inside the
- ui/src/ on the local machine, the
- ui/build/ is created.
- This is a local build deliverable of the lab's
- content. To run the makefile and create
- this local build, you need to go to
- ui/src
- and run
-
-
make -k theme=theme-name clean all
-
-
-
- The theme-name is one of
-
-
-
-
-
maroon-grid
-
blue-icon
-
-
-
-
- or, the command
-
-
-
make clean all
-
-
-
- which uses the default theme maroon-grid.
-
-
-
- The first time around, this build will
- take quite long, because it copies
- the ui/src/MathJax
- directory. The next time onwards, this
- won't be the case.
-
-
-
make clean
-
-
-
- will clean the ui/build/
- directory (but keep the js directory intact)
-
- The second level build creates a
- public_html/build/ inside the
- home page of your lab on the test server.
- The test server simulates the setup of the deployment server.
- It will enable you to check whether your latest build works on
- a public server (besides your local machine).
- In order to deploy the lab on the deployment server,
- the build must first
- be run on the test server.
-
-
-
- You need to run the following command from inside the
- ui/scripts/ directory:
-
where LAB-ID is of the form cseNN. For example: cse09
-
-
- NOTE
-
-
If you do not have the ssh keys to
- devel.virtual-labs.ac.in
- installed on the local machine under the
- correct directory (/home/$USER/.ssh/),
- the script will prompt you for the
- password multiple times.
-
-
The test server may take some time
- to load the new build after running the script. Please keep
- refreshing the web page on the browser
- until it reflects your changes.
-
-
-
-
-
Build 3 : Build for the Deployment server
-
- The third level of the build will serve as the final
- build for the deployment server. The build directory
- created as a result of this final build will
- run on the deployment server. To make the final build,
- you need to run the following command from inside the
- ui/scripts/ directory:
-
USERNAME-ON-DEVEL is the login name for the
- developer on devel.virtual-labs.ac.in
-
-
- OPTIONAL NAME-OF-THEME is an optional
- parameter which could be maroon-grid or
- blue-icon or your own
- theme name.
-
The -F option indicates that
- the script must make a final-build.
- Please note that the -F option must be mentioned as the
- last argument only.
-
-
-
- Once this command is run, a
- final-build will be created inside the
- public_html directory on the test server. This
- final-build will be transferred
- automatically to the deployment server.
-
-
- NOTE
-
-
If you do not have the ssh keys to
- devel.virtual-labs.ac.in
- installed on the local machine under the
- correct directory (/home/$USER/.ssh/)
- , the script will prompt you for the
- password multiple times.
-
-
The test server may take some time
- to load the new build after running the script. Please keep
- refreshing the web page on the browser
- until it reflects your changes.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Content
-
-
-
-
-
- This template features a demo of a
- science lab with a sample
- "simple pendulum"
- experiment. The following
- section will help you to configure this
- template as per your lab experiments.
-
-
-
- The ui/src/lab/
- directory contains three files:
-
-
-
-
index.html
-
default.html
-
content.html
-
-
-
- The same structure has been followed
- inside the
- ui/src/lab/"EXPERIMENT_ID" directory.
- The description and the read-write
- permits for those file have been
- tabulated here as follows :
-
-
-
-
-
file
-
permissions
-
description
-
-
-
index.html
-
read-only
-
home-page
-
-
-
default.html
-
read-only
-
default-content
-
-
-
content.html
-
read-write
-
editable-content
-
-
-
-
-
-
-
Editing content.html
-
-
The structure of content
- for
- ui/src/lab/content.html
- is shown below:
-
-
-
-
- To add your lab's content, edit this
- file.
-
- Add class="default"
- to inherit the default
- structure and behaviour of any element.
- Elements shown in purple are the ones that
- you might want to inherit as default.
-
- Exclude the
- class="default" attribute for
- any element to which you want to
- add your own content.
- By default,
- nav
- generates a list of sections
- while aside
- and footer
- are empty.
-
-
-
-
Adding experiment content
-
- While adding new experiments,
- make sure you create new
- directories following the same
- structure under
- ui/src/lab/"EXPERIMENT-ID"
- and change the
- content.html in the
- same directory. Make sure inside
- the
- ui/src/lab/"EXPERIMENT_ID"
- directory, the files
- index.html
- and
- default.html are not edited.
-
-
-
Embedding multimedia
-
-
- The embed
- tag can be used to embed
- multimedia files.
-
-
-
-
-
-
-
-
-
-
-
-
- Style
-
-
-
-
-
Change CSS styles
-
- The css styles have been defined
- under the
- ui/src/lab/css/.
- However in case you wish to define
- your own css styles, you can add
- your styles to the file
-
- ui/src/lab/css/override.css
- .
-
-
Add your own CSS and JS files
-
- In order to add your own js and
- css files, you will need to modify
- the read write permissions of
-
- ui/src/lab/index.html and
- then include the references of the
- css files.
-
-
-
- (Note:
- ui/src/lab/index.html is
- currently a read-only file. In
- order to write to it you will
- need to modify its read write
- permissions by doing a
-
- chmod 755 "path/file/" ).
- The syntax for adding css file to
- index.html is as follows:
-
- This laboratory gives the basic understanding of structural member under the action of loads. How structure's behaviour will be changed if there is any redundancy and how suddenly it becomes unstable will be experienced by student. Basics of determinate and indeterminate structures will be introduced through virtual experiment. Plastic behaviour of joints can be understood in virtual experiment which otherwise is very difficult to understand in real experiments.
-
-
-The main purpose of any structure is to support the loads coming on it by properly transferring them to the foundation. The computation of internal and external forces and displacements produced by the application of loads to make the structure safe. Detailed analysis is to be performed to determine the bending moments, shear force, axial forces etc at the required section. Basic structural analysis contains; linear elastic analysis of structural systems and members like, beam, column, slab, frame, footing etc.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
\ No newline at end of file
diff --git a/src/lab/List of experiments.html b/src/lab/List of experiments.html
deleted file mode 100644
index 305b2d8..0000000
--- a/src/lab/List of experiments.html
+++ /dev/null
@@ -1,228 +0,0 @@
-
-
-
-
-
-
-
-
-
- Welcome to Virtual Labs - A MHRD Govt of india Initiative
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- This laboratory gives the basic understanding of structural member under the action of loads. How structure's behaviour will be changed if there is any redundancy and how suddenly it becomes unstable will be experienced by student. Basics of determinate and indeterminate structures will be introduced through virtual experiment. Plastic behaviour of joints can be understood in virtual experiment which otherwise is very difficult to understand in real experiments.
-
-
-The main purpose of any structure is to support the loads coming on it by properly transferring them to the foundation. The computation of internal and external forces and displacements produced by the application of loads to make the structure safe. Detailed analysis is to be performed to determine the bending moments, shear force, axial forces etc at the required section. Basic structural analysis contains; linear elastic analysis of structural systems and members like, beam, column, slab, frame, footing etc.
-
- The present lab is aligned with courses of Basic Structural Analysis. These experiments are mostly covered in the curriculam.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Prerequisite S/W
-
-
-
-
-
-
-
Java allows you to play online virtual labs.
-
The Java 3D API enables the creation of three-dimensional graphics applications and Internet-based 3D applets. It provides high-level constructs for creating and manipulation 3D geometry and building the structures used in rendering that geometry. With this software, you can efficiently define and render very large virtual worlds.
-
Adobe Flash (formerly Macromedia Flash) is a multimedia platform used to add animation, video, and interactivity to web pages.
- Welcome to the Physics lab! In this lab, we will do
- virtual experiments to understand Newton's laws of
- motion. We will start with a simple pendulum, and
- from then on, the experiments get more interesting.
-
-Adobe flash player is the only application that allows you to browse
-multimedia content like animations, flash games, videos,
-advertisements, rich media content etc. Adobe flash player is designed
-to support all the operating systems like windows, MAC, linux,
-solaris, android etc.
-
-
-
-
-
-
1.1 For Linux
-
-
-
-
-
-
-
-
1.1.1 GUI ( Graphical User Interface ) Installation
-
-
-
-
-
Auto Installation
-
-
-
Go to Ubuntu software center. Type Adobe flash plugin in the search
- box ( Top right ). You can see the Adobe flash plugin in the list.
-
-
Just press install and wait for the installation to complete.
-
-
After installation you can view multimedia content in your browser.
-
-
-
-
-
-
-
-
Manual Installation
-
-
-
Go to http://get.adobe.com/flashplayer/ and select the version of
- flash player suitable for your system to download. This will download
- a tar.gz plugin in your Downloads folder. b. Unpack the plugin tar.gz
- and copy the files to the appropriate location. c. Once unpacked, you
- will get a directory named usr and a file named libflashplayer.so .
-
-
Open terminal, switch to root account and copy this
- libflashplayer.so file to /usr/lib/mozilla/plugins.
-
-
-
-
Restart the browser and flash will be activated for mozilla.
-
-
- For other browsers, identify the location to put plugins and copy this
- libflashplayer.so file to that location.
-
-
-
-
-
-
-
-
-
-
-
-
1.1.2 CLI ( Command Line Interface ) Installation
-
-
-
-
Before starting the installation, the repository needs to be updated:
-
-
-
-
sudo apt-get update
-
-
-
-
After updating the repository, you can install Adobe flash player
- in a single command:
-
-
-
-
sudo apt-get install flashplugin-installer
-
-
-
-
All in one command ( Alternative ) Alternatively the following
- command will install all the multimedia plugins and libraries that
- needed to play mp3 and video formats. This command will install
- adobe flash player too:
-
-
-
-
sudo apt-get install ubuntu-restricted-extras
-
-
-
-
-
-
-
-
-
-
-
-
-
1.2 For Window
-
-
-
-
-
Go to http://get.adobe.com/flashplayer/ and select the version of
- flash player suitable for your system. The Flash Player installer
- should prompt to begin installation after the download is
- complete. If it does not, start the installer directly from
- Downloads folder.
-
-
After downloading Flash Player, close all open browsers.
-
-
Locate the install flash player file. Unless you have specified otherwise, the file is saved in your Downloads folder.
-
-
Double-click the installer file to begin the Flash Player installation.
- This will install flash on your system.
-
Click on the openjdk-6-jre or openjdk-7-jre package.
-
-
A new tab will open asking for default launching application.
-
-
Open it with Ubuntu Software Center.
-
-
Ubuntu Software Center will ask for some Optional add-ons.
-
-
Tick the option for Icedtea Java Plugin and apply the changes.
-
-
Click on install to install Java and Icedtea plugin.
-
-
-
-
-
-
-
-
-
1.1.2 CLI ( Command Line Interface ) Installation
-
-
-
-
Installing Default JRE/JDK
- This is the recommended and easiest option. This will install OpenJDK
- 6 on Ubuntu 12.04 and earlier and on 12.10+ it will install OpenJDK 7.
-
-
Installing Java with apt-get.First, update the package index:
-
-
-
-
sudo apt-get update
-
-
-
-
Then, check if Java is not already installed:
-
-
-
-
java–version
-
-
-
-
If it returns “The program java can be found in the following
- packagesâ€, Java hasn't been installed yet, so execute the
- following command:
-
-
-
-
sudo apt-get install default-jre
-
-
-
-
This will install the Java Runtime Environment (JRE). If you
- instead need the Java Development Kit (JDK), which is usually needed
- to compile Java applications (for example Apache Ant, Apache Maven,
- Eclipse and IntelliJ IDEA execute the following command:
-
-
-
-
sudo apt-get install default-jdk
-
-
-
-
-
-
That is everything that is needed to install Java. All other
- steps are optional and must only be executed when needed.
-
-
-
-
Installing Icedtea plugin
- IcedTea-Web is a free software implementation of Java Web Start and
- the Java web browser plugin. To install, execute the following
- command:
-
-
-
-
Click Free Java Download to save the set-up file to your computer.
-
-
Click Save for the file in downloads bar to confirm that you want to
- download the file.
-
-
Open the set-up file. Follow the instructions onscreen to finish
- installing Java.
-
-
-
-
-
-
-
-
-
-
1.3 Browser Settings
-
-
-
If your Java application is blocked on the browser because of the
- security guidelines implemented in Java. By changing the security
- settings we can fix this issue, please follow these steps mentioned
- below
-
-
Go to Java Control Panel
-
-
Double click on Java
-
-
Open the Security tab
-
-
Select Medium
-
-
Click on Apply
-
-
-
-
Restart your web browser Even then if it does not work follow these
- steps to Add URLs to the Exception Site list
-
Java 3D is a scene graph based 3D application programming interface
- (API) for the Java platform.
-
-
-
-
-
1.1 For Windows
-
-
-
-
Download the latest version of jre (“1.7 versionâ€) and Java 3d
- package (“1.5 versionâ€) from www.oracle.com.
-
-
Also enable jre on your browser.
-
-
Java 3d package contains three jar files: j3dcore.jar, j3dutils.jar
- and vecmath.jar. Add these to your classpath. It also contains
- dynamic libraries for OpenGL graphics. You should add the directory
- containing these to your LD_LIBRARY_PATH.
-
-
Now set the class path. In Windows you set these with
- Start -> Settings -> Control
- Panel ->System -> Advanced -> Environment Variables. Then create or
- edit your CLASSPATH and LD_LIBRARY_PATH so that they include the
- locations of the Java 3DÂ files you downloaded. For example, if you
- have saved the files to C:/java3d, you should add
-
-
C:/java3d/lib/ext/j3dcore.jar;
-
-
C:/java3d/lib/ext/j3dutils.jar;
-
-
C:/java3d/lib/ext/vecmath.jar to your CLASSPATH and
-
-
C:/java3d/j3d/bin to your LD_LIBRARY_PATH.
-
-
-
-
Restart your browser and you should be able to see the applets that
- use Java 3D.
-
- Rigid frames, usually referred to simply as frames, are composed of straight members connected either by rigid (moment – resisting) connections or by hinged connections to form stable configuration. Rigid frame implies a plane structural system consisting of straight members meeting each other at an angle and rigidly connected at the junction. The members of frames are usually connected by rigid joints, although hinged connections are sometimes used. A rigid joint prevents relative translations and rotations of the member ends connected to it, so the joint is capable of transmitting two rectangular force components and a couple between the connected members. A rigid connection keeps unchanged the angle between members as the entire frame distorts under load.
-
- Types of Joints
-All the structural members in framed buildings or trusses must be adequately connected together so that the applied loads are transferred safely to the ground surface. The types of connection or joints are basically divided into two: stiff and pinned joint.
-Stiff Joint
-This type of joint considered to have fixity at the point of connection and is rigid as it is sometimes called a rigid joint. The feature is that the flexure of one member meets at the joint has an effect on the other members. If it is perfectly stiff, then the angle between the members remains unaltered while rotation takes place.
-Pinned Joint
-It is sometimes called a hinged joint. As an example, many roof trusses and bridges are constructed using the pinned joint principles. These joints allow relative movement of the members and they cannot resist bending moments, unlike in stiff joints. Nowadays bolting and riveting are more common used, although the members cannot move relatively to one another, at some degree of rotation were allowed in practice. This is due to to the elasticity of the system and deformations of the members are relatively very small as this the common practice of assuming all joints in a truss to be pinned.
-
- In this module, basic concepts of simple oscillator
- are explained. Initially, an example of simple
- pendulum is taken and the basic terminology i.e.,
- what is initial displacement,
- initial velocity,natural frequency
- and time period are explained.
- Each of these terms is illustrated by giving an
- example, where user can enter his value and observe
- the behavior of structure for his input.
-
-
-
- Simple harmonic oscillator consists of a
- mass (m) hanging from a string of
- length (l), fixed at a pivot point P.
- When the mass is displaced from its mean
- position by giving some initial displacement
- (angle), oscillator starts swinging back and fourth
- with periodic motion.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Theory
-
-
-
-
-
-
- There are two solutions to \(ax^2 + bx + c = 0\) and
- they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
- By applying Newton's second law for
- rotational systems, the equation of motion for the
- pendulum may be obtained.
-
-
-
- Where, Ï„ = Torque ; I =
- Moment of Inertia; α =
- Angular Velocity. m is mass of the
- oscillator, l is the length of the oscillator and theta is initial
- displacement. The above equation can be rearranged as
-
-
-
- If the amplitude of
- angular displacement is
- small then we can use the approximation
- (sinθ ≈ θ).
- By considering the above approximation, the equation
- of motion reduces to :
-
- where, θ(t) is the history of oscillation,
- θ0 is the initial angle,
- &omega=(g/l)1/2 is the
- natural frequency of
- the motion.
-
-
-
-
-
-
-
-
-
-
-
-
-
- Objective
-
-
-
-
- Objective of simple harmonic oscillator experiment
- is to understand the concept of time period
- (natural frequency) in harmonic
- oscillations .
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Experiment
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Manual
-
-
-
-
- Start the experiment with the default values of
- length, mass and intial displacement (in angle).
- Pause the experiment after few cycles and note
- the observation.
-
-
-
Observation 1:
-
-
-
- Find the time period of the pendulum by noting the
- time interval of any one complete cycle from the
- response graph.
-
-
-
- You may note that this time period value is same
- for any complete cycle.
- Read More
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- Quizzes
-
-
-
-
-
-
- Q1.
- Time taken for one complete oscillation
- is called Time Period of the oscillator.
-
- True
-
- False
-
- Q2.
- Time period of the oscillator is constant for
- given values of mass, length and initial
- conditions.
-
- True
-
- False
-
- Q3.
- Value of Time period depends on initial
- conditions.
-
- True
-
- False
-
- Q4.
- Value of time period depends on mass.
-
- True
-
- False
-
- Q5.
- Value of time period depends on length of the
- oscillator.
-
- True
-
- False
-
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
-