Machining of thin-walled (aluminium alloy) aerospace structures is a critical process due to the high warpage. Current practices in the fixture design and the choice of cutting parameters rely solely on conservative guidelines and the designer’s experience. This paper presents evaluation of clamping force to fix the work piecein aVacuum fixture using Vacuum pump. The ISCARonline calculator is u...

This article addresses the problem of fixture synthesis for 3-D workpieces with a set of discrete locations on the workpiece surface as a point set of candidates for locator and clamp placement. A sequential optimization approach is presented in order to reduce the complexity associated with an exhaustive search. The approach is based on a concept of optimum experimental design, while the optim...

In this paper, we present experiments to determine the e ect of di erent virtual xture compliance levels in a human-machine cooperative manipulation system. Subjects used the JHU Steady Hand Robot with vision-based virtual xtures to perform three common tasks: curve following, o -path targeting, and object avoidance. The virtual xtures provided di erent levels of guidance to the operator, rangi...

Hidden Markov Models (HMMs) are used for automatic segmentation and recognition of user motions. A new algorithm for real-time HMM recognition was developed. The segmentation results are used to provide appropriate assistance in a combined curve following and object avoidance task. This assistance takes the form of a virtual fixture, whose compliance can be altered online. Recognition and assis...

There has been recent interest in novel human-machine collaborative control laws, called “virtual fixtures,” which provide operator assistance for telemanipulation tasks. A forbidden-region virtual fixture is a constraint, implemented in software, that seeks to prevent the slave manipulator of a master/slave telemanipulation system from entering into a forbidden region of the workspace. In this...

Jigs and fixtures were brought to the world of machining, bringing a variety practical purposes. The concept enables rapid mass production same product. Thus, company will streamline manufacturing process for each component boost productivity. At times, machining operation was carried out entirely by machine, without jigs fixtures. As result, created expedite drilling process. project's objecti...

Abstract This paper explores the suitability of Artificial Neural Networks (ANNs) as an enabler Design Automation in turbomachinery industry. Specifically, provides 1) a preliminary estimation effectiveness ANNs to define values for design variables reciprocating compressors (RC) and 2) comparison performance with traditional more computationally demanding methods like CFD. A tailored ANN train...

Reconfigurable assembly systems enable a family of products to be assembled in a single system by adjusting and reconfigurabling fixtures according to each product. The sharing of fixtures among different products impacts their robustness to fixture variation and process disturbances due to frequent reconfiguration. This paper proposes a methodology to achieve robustness of the fixture layout d...