Non-linear modeling of gear drive dynamics incorporating intermittent tooth contact analysis and tooth eigenvibrations

Effects of gear flexibility on the dynamic characteristics of spur and helical gear system

An efficient multibody dynamic model of arresting cable systems based on ALE formulation

A three-dimensional modal theory-based Timoshenko finite length beam model for train-track dynamic analysis

An efficient multibody dynamic model of three-dimensional meshing contacts in helical gear-shaft system and its solution

A model order reduction method for the simulation of gear contacts based on Arbitrary Lagrangian Eulerian formulation

The purpose of the present invention is to increase the collection rate of grinding liquid when cutting a workpiece having a plate thickness changing in the longitudinal direction (vertical direction) and/or the width direction (horizontal direction), and to improve the work environment of a worker. An abrasive water jet machining device is provided with: an abrasive nozzle assembly (11) that jets ultra high pressure water mixed with an abrasive when a workpiece (W) is cut in a desired shape; a catcher cup (12) that collects the ultra high pressure water injected from the abrasive nozzle assembly (11); and a distance adjusting mechanism (13) that adjusts the distance between the abrasive nozzle assembly (11) and the catcher cup (12) so that the distance between the catcher cup (12) and the workpiece (W) is kept constant.

Abrasive water-jet machining device

Disclosed is a stringer manufacturing method such that the operational efficiency is increased, that the operators' work environment is improved, and that the manufacturing cost is reduced. The stringer manufacturing method comprises machining one end of a long member into a desired shape, thereby obtaining a desired stringer, the aforementioned long member being provided with a cap flange, a web, and a base flange, and being an inverted T-shape when viewed from the front, or an I-shape when viewed from the front, or a T-shape when viewed from the front. When the one end of the long member is to be machined into the desired shape, there is used for this purpose a vertical multi-articulation type robot (1) which has at least six axes, and wherein the tip of a valve unit (13) is provided with an abrasive nozzle assembly (14) that injects super high pressure water containing abrasive, and with a catcher cap (15) that recovers the super high pressure water injected by the abrasive nozzle assembly (14).

Stringer manufacturing method

In this study, a reduced-order thermomechanical coupling model, which accounts for the inertia coupling of the thermoelastic deformation and the large reference body motion, is proposed using the f...

Reduced-order thermomechanical modeling of multibody systems using floating frame of reference formulation:

In this work we tackle the path planning problem for a 21-dimensional snake robot-like manipulator, navigating a cluttered gas turbine for the purposes of inspection. Heuristic search based approaches are effective planning strategies for common manipulation domains. However, their performance on high dimensional systems is heavily reliant on the effectiveness of the action space and the heuristics chosen. The complex nature of our system, reachability constraints, and highly cluttered turbine environment renders naive choices of action spaces and heuristics ineffective. To this extent we have developed i) a methodology for dynamically generating actions based on online optimization that help the robot navigate narrow spaces, ii) a technique for lazily generating these computationally expensive optimization actions to effectively utilize resources, and iii) heuristics that reason about the homotopy classes induced by the blades of the turbine in the robot workspace and a Multi-Heuristic framework which guides the search along the relevant classes. The impact of our contributions is presented through an experimental study in simulation, where the 21 DOF manipulator navigates towards regions of inspection within a turbine.

Search-based Path Planning for a High Dimensional Manipulator in Cluttered Environments Using Optimization-based Primitives.

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