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| 1 | Jerk-limited feedrate scheduling and optimization for five-axis machining using new piecewise linear programming approach显示文摘In this paper, a new computation method and an optimization algorithm are presented for feedrate scheduling of five-axis machining in compliance with both machine drive limits and process limits. Five-axis machine tool with its ability of controlling tool orientation to follow the sculptured surface contour has been widely used in modern manufacturing industry. Feedrate scheduling serving as a kernel of CNC control system plays a critical role to ensure the required machining accuracy and reliability for five-axis machining. Due to the nonlinear coupling effects of all involved drive axes and the saturation limit of servo motors, the feedrate scheduling for multi-axis machining has long been recognized and remains as a critical challenge for achieving five-axis machine tools’ full capacity and advantage. To solve the nonlinearity nature of the five-axis feedrate scheduling problems, a relaxation mathematical process is presented for relaxing both the drive motors’ physical limitations and the kinematic constraints of five-axis tool motions. Based on the primary optimization variable of feedrate, the presented method analytically linearizes the machining-related constraints, in terms of the machines’ axis velocities, axis accelerations and axis jerks. The nonlinear multi-constrained feedrate scheduling problem is transformed into a manageable linear programming problem. An optimization algorithm is presented to find the optimal feedrate scheduling solution for the five-axis machining problems. Both computer implementation and laboratorial experiment testing by actual machine cutting were conducted and presented in this paper. The experiment results demonstrate that the proposed method can effectively generate efficient feedrate scheduling for five-axis machining with constraints of the machine tool physical constraints and limits. Compared with other existing numerical methods, the proposed method is able to find an accurate analytical solution for the nonlinear constrained five-axis feedrate scheduling problems without compromising the efficiency of the machining processes. | SUN YuWen CHEN ManSen JIA JinJie LEE Yuan-Shin GUO DongMing | 2019 | Science China(Technological Sciences)2019，62，7： | 7 |
| 2 | Path,feedrate and trajectory planning for free-form surface machining:A state-of-the-art review显示文摘Nowadays,free-form surfaces have been widely used in various industrial fields.They are usually machined by CNC machine tools,but recently have also begun to be manufactured by industrial robotic arm manipulators,thanks to low cost,large operation reaching space and high machining flexibility of robot.So far,various methodologies have been proposed to improve efficiency and quality of free-form surface machining,thus this paper aims at providing a state-ofthe-art review on research advances in free-form surface machining.In this review,tool path generation,feedrate scheduling in Cartesian space and trajectory planning in joint space are focused for both CNC machining and robot machining,and their research statues,existing difficulties and key issues are discussed in detail.Finally,the feasible routes,breakthrough points and future development trend are also expounded. | Yuwen SUN Jinjie JIA Jinting XU Mansen CHEN Jinbo NIU | 2022 | Chinese Journal of Aeronautics2022，35，8： | 3 |
| 3 | The role of conservative management in congenital tracheal stenosis:an evidence-based long-term follow-up study显示文摘 | Cheng W Mansen DE Forte V | 2006 | J Pediatr Surg2006，41，7： | 1 |
| 4 | Expression of the peroxisome proliferators- activated receptor (PPAR) in the mouse colonic mucosa显示文摘 | Mansen A Guardiola-Diaz H Rafter J | 1996 | Biochem Biophys Res Commun1996，222，： | 1 |
| 5 | TRs have common and isoform-specific functions in regulation of the cardiac myosin heavy chain genes显示文摘 | Mansen A Yu F Forrest D | 2001 | Mol Endocrinol2001，15，12： | 1 |
| 6 | Simulation of nitrogen dynamics and biomass production in winter wheat using the Danish simulation model DAISY显示文摘 | Mansen S Jensen H E Nielsen N E | 1991 | Fertilizer Research1991，27，： | 1 |
| 7 | A prospective study of sleep duration and coronary heart disease in women 显示文摘 | Ayas N T White D P Mansen J E | 2003 | Arch Intern Med2003，163，2： | 1 |
| 8 | Expression of the peroxisome proliferator-activated receptor (PPAR) in the mouse colonic mucosa显示文摘 | Mansen A Guardiola-Diaz H Rafter J | 1996 | Biochem Biophys Res Commun1996，222，3： | 1 |
| 9 | miRNA-dependent gene silencing involving Ago2-mediated cleavage of a circular anti- sense RNA显示文摘 | Mansen TB Wiklund ED Bramsen JB | 2011 | EMBO J2011，30，21： | 1 |
| 10 | Ablation of TRalpha2 and a concomitant over-expression of alpha1 yields a mixed hypo-and hyperthyroid phenotype in mice显示文摘 | Salto C Kindblom JM Johansson C Wang Z Gullberg H Nordstrom K Mansen A Ohlsson C Thoren P Forrest D Vennstrom B | | 0，，： | 1 |
| 11 | Identification of Rev- erbalpha as a physiological repressor of apoC-Ⅲ gene transcrip- tion显示文摘 | RASPE E DUEZ H MANSEN A | 2002 | J Lipid Res2002，43，12： | 1 |
| 12 | Hormone therapy and coronary heart disease: the role of time since menopause and age at hormone In- itiation显示文摘 | Grostein F Mansen JE Stampfer MJ | 2006 | J Women''s Health2006，15，1： | 1 |
| 13 | Competitive solidphase ermyme-linked immunoassay for the quantification of limonin in citrus显示文摘 | Tourdan P S Mansen R L Oliver D G | | Arm Bionchem0，138，1： | 1 |
| 14 | Identification of Rev- erbalpha as a physiological repressor of apoC-III gene transcription 显示文摘 | RASPE E DUEZ H MANSEN A | 2002 | J Lipid Res2002，43，12： | 1 |
| 15 | hnpregnation technology for thermoplastic matrix composites 显示文摘 | GIBSON A G MANSEN J A | 1992 | Composites Manufacturing1992，3，4： | 1 |
| 16 | Expression of the peroxisome proliferator-activated receptor (PPAR) in the mouse oolonic mucosa显示文摘 | Mansen A Guardiola-Diaz H Rafter J | 1996 | Bioehem Biophys Res Commun1996，222，3： | 1 |
| 17 | Atrophy of the liver after occlusion of the bile duck or the portal vein and compensatory hypertrophy of the unoceluded portion and its clinical importance 显示文摘 | Sehalm L Bax HR Mansen B J | 1956 | Gastroenterology1956，32，8： | 1 |
| 18 | TRs have common and isoform-specific functions in regulation of the cardiac myosin heavy chain genes显示文摘 | Mansen A Yu F Forrest D | 2001 | Mol Endocrinol2001，15，12： | 1 |
| 19 | Airborne Radar显示文摘 | Mansen D W | 2011 | AVIONISC NEWS2011，，： | 1 |
| 20 | Obesity in the united Staste:a fresh look at its high toll显示文摘 | Mansen JE Bassuk SS | 2003 | JAMA2003，289，： | 1 |
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