is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Tolerancing decisions can profoundly impact the quality and cost of the mechanism. To evaluate the impact of tolerance on mechanism quality, designers need to simulate the influences of tolerances with respect to the functional requirements. Thi...

The allocation of design tolerances between the components of a mechanical assembly and manufacturing tolerances can significantly affect the functionality of products and related production costs. This paper introduces Imperialist Competitive Algorithm (ICA) approach to solve the machining tolerance allocation of an overrunning clutch assembly.  The objective is to obtain optimum tolerances of...

When adapting a product design for manufacturability and developing it into detail, the initial design intent may be distorted. Further, once attaining a fully defined product, assigned tolerances and production capacity determine the level of variation affecting each manufactured product, resulting in unit-to-unit differences in colour and geometry. Here, focus is set on visible geometrical de...

This paper examines the effects of geometric tolerances on the natural frequencies of rotating shafts. In order to model the tolerances, a code is written in MATLAB 2013 that produces deviated points. Deviated points are controlled by different geometric tolerances, including cylindricity, total run-out and coaxiality tolerances. Final surfaces and models passing through the points are created ...

Geometrical inaccuracy of sheet metal parts due to springback are the reason for considerable efforts in the tool and process development. Numerous studies have been carried out in order to find the optimum process parameters and tool geometry so that the resulted parts to be within tolerances. In the present paper, the finite element method coupled to the neural network method are used to get ...

This paper uses MEMS circuit-level simulation to correlate gyro performance measures such as zero rate output (ZRO), linear acceleration sensitivity (Sa) and cross-axis sensitivity (Sca) to geometrical asymmetries. Elastic and electrostatic asymmetries in the gyroscope may arise due to device-level manufacturing variations in beam width, comb gap and metal mask misalignment in the CMOS-MEMS pro...

A strategy to examine the sensitivity of electrical device parameters on geometrical and technological tolerances is described. An approach is offered to determine the limit of device miniaturization for a given fabrication process and a desired operating condition. As a didactic example of practical relevance the minimum channel length for a modern silicon gate, double implant process due to t...

In this paper, electrical characterization and modeling of conductive textiles are presented. A dedicated measurement setup has been developed to allow reliable connection of the textile samples with the equipment cables. Geometrical fabric structures and fabrication tolerances as well as high frequency properties up to 6 GHz for four types of textiles have been determined. Transmission lines w...

Part tolerances and fixture layouts are two pivotal factors in the geometrical quality of a compliant assembly. The independent design optimization these for assemblies have been thoroughly studied. However, this paper presents dependency and, consequently, demand an integrated them. A method is developed order to address issue by utilizing variation simulation tools evolutionary algorithms. Th...

Spectrally engineered semiconductor Fabry-Perot laser resonators are designed to enhance the optical feedback for selected longitudinal modes, which thereby require less gain for lasing. This is achieved by introducing refractive index perturbations along the length of the resonator. However, the physical realization of these resonators is a challenge because of very narrow tolerances; in parti...