...) design that uses models to predict the result from a given set of welding parameters and minimizes a cost function for optimizing the welding parameters; and (3) real-time sensing and control that overcome the deviations of welding conditions from their nominal ones used in optimizing the welding...

... especially under varying cutting conditions. This paper proposes a closed-loop SSV cutting system to suppress chatter in turning. The dimensionless SSV amplitude is adaptively adjusted with a model-free controller to accommodate change of the chatter level. The wavelet packet entropy (WPE) is computed online...

... as (22) s c ( t k ) = s ( t k ) − s ̂ p ( t k ) ≅ ∑ m = 1 M S c , m ( t k ) sin ( ω C H , m t k + ϕ c , m ) Control Machine tool dynamics Modeling and simulation Automation...

... magnetic table are modified in real time to compensate for the tooltip deviation using a gradient descent algorithm. The algorithm is simulated and verified experimentally on the nine-axis micromill controlled by an in-house developed virtual/real-time open computer numerical controlled (CNC) system...

... to capture the layer-by-layer powder bed images. Images are captured at two instances in every layer, namely, post laser scan and post re-coat. The camera shutter is controlled by a proximity sensor that registers the location of the recoater blade. Five images of the powder bed images are captured under...

...Tao Huang; Lijun Zhu; Shengli Du; Zhiyong Chen; Han Ding Milling chatters caused by the regenerative effect is one of the major limitations in increasing the machining efficiency and accuracy of milling operations. This paper studies robust active chatter control for milling processes with variable...

...Brandon P. Smith; Mahdi Ashrafi; Mark E. Tuttle; Santosh Devasia This paper investigates an out-of-autoclave (OoA), embedded-resistive heating method to precisely control the bondline temperature when curing high strength adhesives for joining composite adherends. A challenge with OoA methods...

... quality and instruct new practitioners. Manuscript received November 9, 2017; final manuscript received May 9, 2018; published online June 4, 2018. Assoc. Editor: Karl R. Haapala. 09 11 2017 09 05 2018 Control Grinding Sensing Monitoring Abrasive processes Automation...

...Lawrence W. Funke; James P. Schmiedeler Parts made via polymer extrusion are currently limited to a constant cross section. Additionally, the process is difficult to control, so desired final part dimensions are often achieved via a manual trial-and-error approach to parameter adjustment. This work...

... 2017 12 02 2018 Control Modeling and simulation Sensors Sensing Monitoring Automation Diagnostics Vacuum arc remelting (VAR), is the metallurgical process of remelting metal ingots with the application of a direct current into the system, in a vacuum environment. The result...

... of the web at the beginning of the web span ( ϑ i ( 0 , t ) ); these are obtained from Eqs. (13) , (14) , and (16) . This span governing equation allows (1) analysis of web transported through heating/cooling sections and (2) the control system designed to test the robustness...

...Qin Hu; Youping Chen; Jixiang Yang; Dailin Zhang Linear motion commands of multi-axis computer numerical control (CNC) machine tools need to be smoothed at the transition corners, because the velocity discontinuities at corners can result in fluctuations on machine tool motions and lead to poor...

...Xiaowei Yue; Yuchen Wen; Jeffrey H. Hunt; Jianjun Shi Shape control of composite parts is vital for large-scale production and integration of composite materials in the aerospace industry. The current industry practice of shape control uses passive manual metrology. This has three major limitations...

... chatter vibration, an unequal pitch turning method was proposed. In this method, the upper tool was controlled based on the optimum pitch angle calculated from spindle speed and chatter frequency. Chatter frequency was identified from estimated cutting force by a disturbance observer (DOB). From...

... programmability in conventional toolpath planning approach in machining leads to significantly higher manufacturing cost for direct computer numerical control (CNC)-based prototyping (i.e., subtractive 3D printing). In standard computer-aided manufacturing (CAM) packages, general use of B-rep (boundary...

..., provide an opportunity to overcome such challenges. However, little has been done to fully utilize the image profiles acquired in the AM process and study the fractal patterns for the purpose of process monitoring, quality assessment, and control. This paper presents a new multifractal methodology...

.... E. , and Strauss , A. M. , 2014 , “ Friction Stir Welding: Process, Automation, and Control ,” J. Manuf. Process. , 16 ( 1 ), pp. 56 – 73 . 10.1016/j.jmapro...

... manuscript received July 24, 2017; published online December 18, 2017. Assoc. Editor: Tony Schmitz. 01 04 2017 24 07 2017 Control Machining processes Sensing Monitoring Automation Diagnostics Tool failure is a complex phenomenon that involves one or more failure modes...

... algorithms is to extract and reconstruct the worn area's geometry after best-fit for adaptive numerical control paths. Automated worn area modeling is a main focus in the automated repair process. Because the geometry and location for each worn component is unique, even the types of defects vary from...

... manuscript received August 4, 2017; published online November 21, 2017. Assoc. Editor: Karl R. Haapala. 01 05 2017 04 08 2017 Assembly Control Automation In the past few decades, the increasing concern of the environment by the government, industries, and public has led...