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Gary P. Maul

Bio: Gary P. Maul is an academic researcher from Ohio State University. The author has contributed to research in topics: Actuator & Control valves. The author has an hindex of 9, co-authored 20 publications receiving 259 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a mathematical model of a bowl feeder was developed by using state-space methods to evaluate bowl-feeder parameters, and a computer simulation can predict the velocity of the parts in the bowl and subsequently the part feed rate.

70 citations

Journal Article
TL;DR: In this article, a statistical process design method is proposed for robotic gas metal arc (GMA) welding of sheet metal, with the objective of minimizing weld cycle time by maximizing welding travel speed, while maintaining predictable weld quality over a range of worst-case processing conditions.
Abstract: A statistical process design method is proposed for robotic gas metal arc (GMA) welding of sheet metal. The proposed method has the objective of minimizing weld cycle time by maximizing welding travel speed, while maintaining predictable weld quality over a range of worst-case processing conditions. This formulation offers a coherent alternative to Taguchi signal-to-noise ratios that permits the use of classically designed experiments that have potential advantages in experimental cost savings. The method is based on recommended choices of independent variables that place all experimental points in the region of interest. Also, so relatively simple weld evaluation approach was included for sheet metal applications. The method was applied on 16-gauge, 409 stainless steel lap joint welds in the horizontal position. The optimization revealed interesting dependencies of achievable travel speeds on root opening and welding gun positioning factors.

44 citations

Journal ArticleDOI
TL;DR: A vibratory bowl feeder with a computer-based sensor system that can recognize correctly oriented parts even when some are configuous or overlapping and an algorithm is developed to recognize parts in the orientation specified by the user.

33 citations

Journal Article
TL;DR: In this paper, a systeme d'alimentation de pieces vibratoire muni de capteurs for reconnaitre la position des pieces is described, e.g. cycles of travail.
Abstract: Cas d'un systeme d'alimentation de pieces vibratoire muni de capteurs pour reconnaitre la position des pieces. Etude des temps des cycles de travail

18 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe a model of part behavior required for reorienting a part with an air-jet-based computer controlled orienting system, which can be used to eliminate jamming and improve feed rates in VBFs.
Abstract: Vibratory bowl feeders (VBFs) are widely used in industry for feeding and reorienting small parts in high volume production. Standard VBF tooling consists of various mechanical barriers inserted in the bowl path which are prone to jamming and limit the feeder to only one type of part. Programmable feeders have been developed to improve the flexibility of these devices, however feed rates are often low. This research describes the development of a model of part behavior required for reorienting a part with an air-jet-based computer controlled orienting system. This system can be used to eliminate jamming and improve feed rates in VBFs. The control algorithm accepts the part's weight, geometry, and its orientation. Sensors then compare the present with the desired orientation and the algorithm determines the appropriate pulse of air to produce the desired orientation.

14 citations


Cited by
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Journal ArticleDOI
TL;DR: A comprehensive literature review of the application of evolutionary algorithms, evolutionary algorithms and computational network in the area of welding has been introduced herein and was classified according to the output features of the welding, i.e. bead geometry and mechanical properties of the welds.

411 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of laser power (1.2-1.43kW), welding speed (30-70 cm/min) and focal point position (−2.5 to 0mm) on the heat input and the weld-bead geometry (i.e. penetration, welded zone width, and heat affected zone width (W HAZ )) was investigated using response surface methodology (RSM).

368 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the development of mathematical equations to predict the weld bead geometry and dilution with three factor five level factorial experiments, and the results of the confirmation experiments showed that the models developed are able to predict bead geometries and dilutions with reasonable accuracy.

118 citations

Journal ArticleDOI
TL;DR: In this article, a compliant platform based on the von Mises compliance matrix is proposed for a bowl feeder, which is decomposed into a central compliance matrix and an adjoint transformation leading to the decomposition of the legs' parameter effect from the platform assembly influence.
Abstract: The platform based vibratory bowl feeders are essential elements in automatic assembly. Taking the bowl feeder as a typical three-legged rigidly connected compliant platform device, this paper applies von Mises' compliance matrix to each of the leaf-spring legs, establishes screw systems of the legs and develops the Jacobian of the platform using the adjoint transformation. Based on the force equilibrium between the supporting and external wrenches and the twist deflection, a platform compliance matrix is proposed as a congruence transformation of the legs' compliance matrices. The matrix is then decomposed into a central compliance matrix and an adjoint transformation, leading to the decomposition of the legs' parameter effect from the platform assembly influence. The analysis presents the necessary and sufficient condition for the existence of the twist deflection that is equivalent to the characteristics equation of the compliant platform. Further based on the eigencompliances and eigentwist decomposition, the legs' parameter effect and the platform assembly parameter influence are identified. This reveals the compliance characteristics of this type of devices and the parameters' effect on the compliance and presents a suitable parameter range for design of the compliant platform device.

91 citations

Journal ArticleDOI
TL;DR: In this article, a review of non-standard applications of statistical process control (SPC) charts is presented, with a focus on the problems to which SPC control chart techniques can be applied.
Abstract: The principal application domain for statistical process control (SPC) charts has been for process control and improvement in manufacturing businesses. However, the number of applications reported in domains outside of conventional production systems has been increasing in recent years. Implementing SPC chart approaches in non‐standard applications gives rise to many potential complications and poses a number of challenges. This paper reviews non‐standard applications of SPC charts reported in the literature from the period 1989 to 2000, inclusive. Non‐standard applications are analysed with respect to application domain, data sources used and control chart techniques employed. Applications are classified into five groups according to the types of problem to which control chart techniques have been applied. For each group the nature of the applications is described and analysed. The review does not show a paradigm shift in the types of SPC control chart applications but does show clearly that the application boundaries extend considerably beyond manufacturing and that the range of problems to which SPC control chart techniques can be applied is much wider than commonly assumed. The paper highlights the critical fundamental and technical issues that need to be addressed when applying SPC chart techniques in a range of non‐standard applications. Wider managerial issues of importance for successful implementations in non‐standard applications of SPC control charts are also discussed.

90 citations