The Development of MURJ-3D: A Modular, Universal, Re-Configurable Joint for 3-D Space Frame Applications

1997 ◽  
Vol 12 (2) ◽  
pp. 89-100 ◽  
Author(s):  
N.S. Bardell ◽  
D. Brown ◽  
P.D. Shearn ◽  
D.P. Turner ◽  
J.R. Longbourne ◽  
...  
Keyword(s):  
Space Frame ◽  
Exact Number ◽  
Space Frames ◽  
Lattice Space ◽  
Design Build ◽  
Test Schedule

Currently available joints used for constructing 3-D lattice space-frames effectively prescribe the geometry of the resulting framework and favour regular, repetitive structural geometric forms; to embrace more general geometric forms requires costly, individually-tailored, joints to be made. This paper describes a new, modular, universal, reconfigurable, joint (MURJ-3D) which has been designed specifically to overcome such problems, and hence to permit the construction of both regular and irregular framework geometries with equal facility. Each MURJ-3D acts as a structural node in any general 3-D space-frame by joining together a large number of lattice members whose longitudinal axes all coincide at a point in space. The exact number of lattice members that can be attached to a single MURJ-3D is not specified, but the capacity of the joint is such that the number of available connections is likely to exceed the maximum number of members required in any given application. The location of the connections is, for all practical purposes, infinitely variable over the surface of a sphere. The MURJ-3D is designed to permit subsequent full reconfiguration of the framework member geometry, including the addition and/or removal of individual members; its application to temporary structures, or those requiring in-situ erection, is particularly germane. The concept presented here is validated using a design, build and test schedule, which clearly demonstrates the general efficacy of the joint.

The Application of Slip Joint Use in Space Frame Structure for Vehicle

2013 ◽  
Vol 423-426 ◽  
pp. 1944-1947
Author(s):  
Sheng Yun Lee ◽  
Ting Hao Cheng ◽  
Yu Ting Lin
Keyword(s):  
Dimensional Accuracy ◽  
Element Model ◽  
Frame Structure ◽  
Poor Control ◽  
Space Frame ◽  
Space Frames ◽  
The Common ◽  
The Finite Element Model ◽  
Joint Method ◽  
Space Frame Structure

The purpose of this paper is to analysis the finite element model of joint methods for chassis space frames of vehicles. Common tee-joint often have poor control of dimensional accuracy. The analysis includes the common tee-joint and new joint method. Although the new joint method will increase in weight a little and easily adjust the accuracy of space frame, it will also improve the connection strength.

Space Frames: An Alternative to the Architectural Cube

1991 ◽  
Vol 6 (4) ◽  
pp. 287-295 ◽  
Author(s):  
J. Francois Gabriel
Keyword(s):  
Cross Section ◽  
Architectural Drawings ◽  
Space Frame ◽  
Space Frames ◽  
Floor Plans ◽  
The Cross ◽  
The Aesthetic ◽  
Structural Matrix

In architecture, the cube is ubiquitous. It is easier to produce architectural drawings of parallelepipedic buildings, but such buildings are not any better structurally, functionally or aesthetically than buildings based on the cross section of a honeycomb, for example. What is essential in the physical fabric of a building is that floors be horizontal and that floor plans be regular and orderly, lest the user become confused. A space frame is a better structural matrix than a post-and-beam matrix. The problem for the architect is then, first, to make habitable spaces within a space frame, where all the columns are oblique. Secondly, since architecture is not merely the making of habitable spaces, the job of the architect is to make sure that his spaces fulfill the aesthetic as well as the practical needs of the users.

Shock Optimization in a Military Vehicle With Internal Space Frame

2009 ◽  
Author(s):  
Jagadeep Thota ◽  
Mohamed B. Trabia ◽  
Brendan J. O’Toole
Keyword(s):  
Structural Integrity ◽  
Impact Load ◽  
Random Search ◽  
Search Space ◽  
Quadratic Approximation ◽  
Internal Space ◽  
Space Frame ◽  
Military Vehicles ◽  
Space Frames ◽  
Mine Blasts

Space frames are usually used to enhance structural strength of the vehicle while reducing its overall mass. These frames are comprised of beams that are joined together. Recently, space frames are being incorporated in military vehicles. Space frames in military vehicles are however subjected to different types of loading than what is encountered in civilian vehicles such as projectile impacts and land mine blasts. Due to the need to replace a damaged section of the space frame quickly, the proposed space frame is composed of hollow square cross-section bars and angle sections that are bolted together. The space frame is enclosed by uniform-thickness armor, except at the turret. The vehicle is subjected to high impact load to simulate a projectile hit. The objective of this work is to minimize shocks at various critical locations of the space frame while maintaining the overall structural integrity of the vehicle. The vehicle model is parameterized to achieve this objective. This problem is solved using the Successive Heuristic Quadratic Approximation (SHQA) technique, which combines successive quadratic approximation with an adaptive random search within varying search space. The entire optimization process is carried out within MATLAB environment.

Space Frames and Span-over Buildings

1991 ◽  
Vol 6 (4) ◽  
pp. 257-265
Author(s):  
Yona Friedman
Keyword(s):  
Frame Structures ◽  
Space Frame ◽  
Industrial Countries ◽  
Space Frames ◽  
Green Areas

Space frame structures can be used both in industrial countries and in countries where labor is inexpensive. Such frameworks can be used as “containing structures” wherein the void between bars is converted into usable space. Frameworks containing usable spaces can span over large areas on the ground, also usable. “Spatial urbanism” thus consists of a rigid and airy framework forming patterns of easily transformable volumes. The framework is raised high above the ground and the ground itself is used for commercial, cultural and business, purposes, circulation, and green areas for which sunlight is provided by the gaps in the framework. The final townscape is arrived at through multiple decisions involving the population. This townscape is called “mobile architecture” and is the most democratic and convivial form of architecture possible.

Structural Behaviour of Single Layer Space Frame with Member Arrangement Following Spiral Phyllotaxis

2013 ◽  
Vol 842 ◽  
pp. 505-511
Author(s):  
Kok Keong Choong ◽  
Jae Yeol Kim
Keyword(s):  
Single Layer ◽  
Plant Structure ◽  
Structural Behaviour ◽  
Space Frame ◽  
Physical Constraints ◽  
Finite Element Software ◽  
Space Frames ◽  
Structural Space ◽  
Regular Arrangement ◽  
Frame System

The regular arrangement of the plant organs is botanically known as phyllotaxis. Among the types of phyllotaxis found in nature, spiral phyllotaxis is the most frequently found pattern. The unique arrangement of this pattern in plants has benefited most of the plant structure as it enables them to grow more efficiently and compatible for physical constraints such as moisture and amount of light falls. In this research, the unique spiral phyllotaxis pattern has been adopted as idea for member arrangement pattern for structural space frame system. Two type of spiral phyllotaxis pattern and one regular model are generated. Analysis using finite element software LUSAS has been carried out in order to determine the effect of member arrangement following spiral phyllotaxis on stresses and displacement in the space frames.

scholarly journals Towards Reusable Surrogate Models: Graph-Based Transfer Learning on Trusses

2021 ◽  
pp. 1-12
Author(s):  
Eamon Whalen ◽  
Caitlin Mueller
Keyword(s):  
Engineering Design ◽  
Transfer Learning ◽  
Surrogate Models ◽  
Training Data ◽  
Frame Structures ◽  
Data Sets ◽  
Displacement Fields ◽  
Space Frame ◽  
Design Variables ◽  
Space Frames

Abstract Surrogate models are often employed to speed up engineering design optimization; however, they typically require that all training data conform to the same parametrization (e.g. design variables), limiting design freedom and prohibiting the reuse of historical data. In response, this paper proposes Graph-based Surrogate Models (GSMs) for space frame structures. The GSM can accurately predict displacement fields from static loads given the structure's geometry as input, enabling training across multiple parametrizations. GSMs build upon recent advancements in geometric deep learning which have led to the ability to learn on undirected graphs: a natural representation for space frames. To further promote flexible surrogate models, the paper explores transfer learning within the context of engineering design, and demonstrates positive knowledge transfer across data sets of different topologies, complexities, loads and applications, resulting in more flexible and data-efficient surrogate models for space frame structures.

scholarly journals X-ray Computed Tomography Data ofAdditive Manufacturing Metrology Testbed (AMMT) Parts: “Overhang Part X4”

2020 ◽  
Vol 125 ◽  
Author(s):  
Max Praniewicz ◽  
Brandon Lane ◽  
Felix Kim ◽  
Christopher Saldana
Keyword(s):  
Additive Manufacturing ◽  
Three Dimensional ◽  
Sensor Data ◽  
X Ray ◽  
Surface Data ◽  
Design Build ◽  
X Ray Computed ◽  
In Situ Sensor ◽  
Stereolithography Files

This document provides details on the data and files generated from post-build X-ray computedtomography (XCT) measurements of the four parts built as part of the “Overhang Part X4” dataset. The “Overhang Part X4” dataset was a three-dimensional (3D) additive manufacturing (AM) build performed on the Additive Manufacturing Metrology Testbed (AMMT) by Ho Yeung and Brandon Lane on June 28, 2019. The files discussed in this document include image sequences for each part, stereolithography files (.STL) of the surface data extracted from XCT. This data is one of a set of “AMMT Process Monitoring Datasets”, as part of the Metrology for Real-Time Monitoring of Additive Manufacturing project at the National Institute of Standards and Technology (NIST). In-situ sensor data, part design, build command and scan strategy data, materials, and associated metadata for this build are described in Ref. [1]. Readers should refer to the AMMT datasets web page for updates.

Heuristic Gradient Projection for 3D Space Frame Optimization

2005 ◽  
Author(s):  
Maged R. Abd El Malek ◽  
Mohamed S. Senousy ◽  
Hesham A. Hegazi ◽  
Sayed M. Metwalli
Keyword(s):  
Stress Constraints ◽  
Optimization Techniques ◽  
Gradient Projection ◽  
Space Frame ◽  
Finite Element Program ◽  
3D Space ◽  
Space Frames ◽  
Model Condition ◽  
Element Program ◽  
Constraints Satisfaction

The purpose of this work is to develop a novel optimization process for the design of space frames. The main objective is to minimize the space frame volume and consider stress constraints satisfaction. A finite element program is devised to synthesize 3D-space frames and aid in its topology optimization. The program is verified through different elementary problems with known analytical solutions as well as with commercial packages. A Midi-Bus frame is modeled with about 300 members and analyzed for a severe road model condition. The optimization effectively uses the devised Heuristic Gradient Projection (HGP) technique to synthesize the optimum Midi-Bus frame. Results indicate a marked improvement over available designs and remarkably faster convergence over other optimization techniques. This technique can thus be effectively applied to other large 3D space frame synthesis and optimization.

Sign in / Sign up

Export Citation Format

Share Document