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The GHS LM or "General Load Monitor" is a special configuration
of GHS which is used aboard ships to check the stability and strength
(if applicable) associated with loading conditions. This gives the
vessel operator the ability to quickly evaluate the stability of
present and anticipated loading conditions. One of the advantages of GHS LM is that it includes the same "calculating engine" which is present in GHS. It does not rely on precomputed hull and tank characteristics ; rather, it computes these directly in each new condition. This simplifies the preparation of the data for the on-board application and eliminates a source of errors. It also leads to more accuracy over a wider range of trim angles ; even in flooding and grounding calculations. In use, GHS LM is straightforward and easy. It is entirely under menu control where the operator need only select among choices presented on the screen. The primary screen interface is graphical and shows a representation of the vessel and the locations of tanks and nonliquid weights. It presents immediate responses of draft, trim and stability margin when the operator changes loads in tanks or the value and location of nonliquid loads. Special versions of GHS LM can be produced to meet special requirements of various types of ships. Detailed models of cranes and mooring systems are two examples. The volume expansion of petroleum products with temperature change is available. The GHS LM software is available not only from Creative Systems and its formal representatives but also from many of the GHS users who are naval architects and are familiar with the process of customizing GHS such that it becomes a GHS LM installation. Of course GHS-LM is fully configurable, from language customization to the programming of any desired function in menus and buttons. Multi-Body The Multi-body module allows General HydroStatics (GHS) and GHS-LM(GHS Load Monitor) software to handle multiple floating bodies with points of contact between them. Ground contact can be included simultaneously |
Some applications
of Multi-Body are :
Equilibrium of the entire multi-body system is found automatically and the forces at the points of contact are reported. This new capability is available through an optional software module being called simply "Multi-Body" or MB. It is tightly integrated with GHS so that the usual features of the program can be used in conjunction with it. The MB module allows GHS to model the interactions of multiple vessels in a wide variety of configurations when latched together or resting on each other. It models each vessel in a separate side-by-side session of GHS and quickly solves for simultaneous equilibrium whenever anything in the system changes. For example, the effect of changing the load in a tank on one vessel can be seen also in the draft, trim and heel of the vessel with which it is in contact as well as in the contact force. The contact forces are automatically included in stability, longitudinal strength and torque calculations. |
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GLM
has been installed on hundreds of vessels including tankers, bulkers,
container ships, drill ships, research vessels, naval vessels, ice
breakers, fishing vessels and passenger vessels. GLM is straightforward and easy to use. It is entirely under menu control where the operator need only select among choices presented on the screen. A spreadsheet-style interface parallels graphics showing the locations of tanks and other weights items. The program presents immediate responses of draft, trim and stability margin when the operator changes loads. Connections to tank gauging systems can also be arranged for automatic tank load monitoring. Special versions of GLM can easily be produced to meet special requirements. The flexibility of this program and the willingness of the developers to meet special requirements cannot be overemphasized. Many features are available through configuration settings, making it economical to apply GLM to all kinds of vessels without incurring extra development costs. |
For crane and offshore applications, detailed simulations of cranes and mooring systems can be included in the configuration. For tanker applications, volume expansion of petroleum products with temperature change is available. Integrated tug/barge systems can make use of the GLM Multi-Body capability to find loadings that minimize vertical force at the coupling. A Ballast Advisor feature helps determine the amount of ballast to shift in order to achieve trim and list corrections. Hull-twisting torque calculations and flexible container loading arrangements are available for container ships. High-quality, scalable, graphical views of loading conditions that accurately show tank loading levels are available in a wide variety of configurations. These can be viewed on screen and also included in reports. Righting-arm curves and various longitudinal strength curves are also available both on-screen and in reports. The GLM software is available not only from Creative Systems but also from many of the naval architects who use GHS in the course of preparing Trim and Stability books. Supplying GLM along with the T & S book is a cost-effective way to make sure the client is able to make good use of the information.
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