710 GHS Longitudinal Strength
How to conduct a basic longitudinal strength analysis in GHS. Includes the following items.
- Defining distributed weights in GHS.
- Performing a longitudinal strength analysis
- Reporting longitudinal strength at specific frame locations
Homework 711 covers basic longitudinal strength. The main focus of this homework is to understand the correct way to add weight items as distributed loads. The light ship weight gets added as a distributed weight. And there is a deadweight item also added as deadweight. Tank weights are also included. Finally, the homework covers how to define frame locations for a longitudinal strength analysis. Download includes homework files and solution.
Edit 1: The light ship weight distribution needed to modified, otherwise GHS was not happy. Please use the following light ship weight distribution.
Location, Weight rate
0.0 m, 5.0 MT/m
10.0 m, 40.0 MT/m
90.0 m, 50.0 MT/m
100.0 m, 10.0 MT/m
TCG = 0.0 m
VCG = 3.0 m
720 GHS Advanced Longitudinal Strength
Advanced features of a longitudinal strength analysis. This tutorial covers the following items.
- Defining shear force and bending moment limits
- Defining section modulus
- Defining moment of inertia and extreme fiber distance
- Performing longitudinal strength with reporting hull stresses
- Performing longitudinal strength with reporting hull deflections
The main challenge of this homework is how to properly define section properties in GHS. Download includes homework files and solution.
Edit 1: The section properties defined in the view are actually too small. This is particularly a problem when you try to define the moment of inertia with extreme fiber distance. The download includes some corrected values for section properties, already converted into the proper units.
730 GHS Adding Waves
How to add waves in GHS and perform a quasi-static analysis. The primary use for adding waves is to assess longitudinal strength. The wave definitions then get combined with the longitudinal strength command to check vessel strength in waves.
This homework covers how to define waves in GHS. Homework files and solution are included in the download.
Edit 1: The wave amplitudes were specifically chosen to be obviously visible in condition graphics. But they were actually too visible. Please use the following wave configurations instead.
180 deg phase
100 m length
3.0 m amplitude (6.0 m wave height)
Stokes Wave (In Place of Trochoidal Wave)
0 deg phase
30 m length
1.5 m amplitude (3.0 m wave height)