background
Metecs

Products > Pong

METECS has responded to the increasing need for rapidly-generated high-fidelity contact models by developing Pong.

Pong - Reduces time and cost to generate contact models

Pong is a software utility that enables rapid implementation of high-fidelity, interference-based, geometric contact dynamics based on 3D graphics models. Pong consists of three parts: a set of scripts to extract geometric data from 3D graphics models, a contact dynamics engine that provides collision detection and force calculations based on the extracted geometric data, and a set of scripts for visualizing the dynamic response with the 3D graphics models. METECS can implement Pong in conjunction with NASA's MBDyn multibody dynamics engine or it can be linked you your existing dynamic simulation. Either way, Pong provides you with the power to rapidly generate your own contact models. Contact METECS and let us show you how we can streamline your contact modeling process.

 

Pong allowed for the rapid development of a contact model to enable HTV-EP insertion training.

Pong allowed for the rapid development of a contact model to enable HTV-EP insertion training.

 

 

 

 

 

 

 

 

 

 


Pong Basics

Pong calculates collision and force interactions between a point and a convex group of planes. These calculations are generalized through the use of multiple convex planar groups to create concave geometries. This calculation can be further generalized to line contact with convex groups of planes by treating the line as two contacting points and considering a small number of line-group contact types such as embedded, impaled, and corner contact. It can be demonstrated that this line-group contact is sufficient to model arbitrary contact between complex groups of convex polyhedra. Contact friction is implemented as a three-dimensional extension to the standard reset-integrator friction model.

Recent Pong Projects

Pong has been used by our customers to reduce development costs on the following projects:

  • A preliminary contact model of the Japanese H2 Transfer Vehicle (HTV) External Palette (EP) insertion interface to enable crew training of the EP insertion operation.
  • Multiple models supporting International Space Station (ISS) Orbital Replacement Unit (ORU) changeout simulations such as the Remote Power Condition Module (RPCM), the Special Purpose Dexterous Manipulator (SPDM) gripper mechanism and its associated micro-fixture.
  • A rapid prototype of the Shuttle Payload Retention Latch Assembly (PRLA) alignment guides to confirm that motion seen in an analysis sim was due to the stalling of of a manipulator joint
  • Latching End Effector (LEE) and grapple fixture models to model partially derigidized LEE operations.
  • Common Berthing Mechanism (CBM), Common Attach System (CAS), and HTV EP contact models in the TS21 ISS simulation to support training.

Pong Real-time Optimization

Pong contact models of the LEE and grapple fixture allow for analysis of partially  derigidized operations.

Pong contact models of the LEE and grapple fixture allow for analysis of partially derigidized operations.

Several optional optimization techniques are implemented in Pong to achieve real-time execution performance with complex contact geometries. These include using line-group contact on one contacting polyhedron with point-group contact on the other contacting polyhedron, use of bounding volumes, definition of non-contacting groups and surfaces, definition of possible contacting pairs, parallel processing, and adaptive ordering of collision calculations.

 

 

 

MAILING ADDRESS:   P.O. Box 891506  |  Houston, TX 77289-1506
CORPORATE OFFICE:   1030 Hercules Ave  |  Houston, TX 77058  |  Phone: 832.476.8651