拱门型可重构机床的动力学英文文献和中文翻译

Abstract Reconﬁgurable manufacturing systems (RMS) address challenges in modern manufacturing systems arising from product variety and from rapid changes in product demand。 This paper considers an arch-type reconﬁgurable machine tool (RMT) that has been built to demonstrate the basic concepts of RMT design。 The arch-type RMT was designed to achieve customized ﬂexibility and includes a passive degree-of-freedom, which allows it to be reconﬁgured to machine a family of parts。 The kinematic and dynamic capabilities of the machine are presented, including the experimental frequency response functions (FRFs) and computed stability lobes of the machine in different conﬁgurations。 A comparison of FRFs and stability lobes of the arch-type RMT reveals almost similar dynamic characteristics at different reconﬁguration positions。 These similar characteristics arise because the dominant mode where chatter occurs is due to the spindle–tool–tool holder assembly。 Consequently, to ensure consistent dynamic behavior regardless of reconﬁguration, a desirable dynamic design feature for RMTs is that the machine’s structural frequencies are less dominant than the structural frequencies of the spindle, tool and tool holder。76168

Keywords: Dynamics; Stability lobes; Customization; Reconﬁguration

1。 Introduction

Traditional manufacturing systems can be classiﬁed as:

(a) dedicated manufacturing systems (DMS)—designed to produce a speciﬁc part or (b) ﬂexible manufacturing systems (FMS)—designed to accommodate a large variety of parts even though parts are not speciﬁed at the design stage。 While DMS is economical when the output volumes are high for a manufactured product over a long period of time, FMS is more suited if the production volume is low and a large variety of parts are produced。 Changing product demands in current markets makes DMS less desirable, but FMS lacks the efﬁciency and robustness of DMS, making it uneconomical for many production situations。

Reconﬁgurable manufacturing systems (RMSs), which aim to achieve ‘exactly the capacity and functionality needed, exactly when needed,’ have garnered considerable attention in recent years [1–5]。 Research has been done on

✕Corresponding author。 Tel。: +1 734 276 8010; fax: +1 734 615 0312。

E-mail address: jdhupia@umich。edu (J。 Dhupia)。

design and operation of RMSs; lead-time; and ramp-up time reduction and open architecture controllers at various research centers in US, Europe and Japan [6–12]。 Industry is also beginning to adopt and implement various aspects of RMS [13,14]。 Indeed, it is becoming clear that reconﬁguration will be an important aspect of many future manufacturing systems。 Key characteristics of an RMS include: (1) modularity, (2) integrability, (3) convertibility,

(4) customization, (5) scalability, and (6) diagnosibility。 The more of these characteristics a manufacturing system possesses, the more reconﬁgurable it becomes。

An important issue is the appropriate ‘granularity’ of the modules in an RMS。 For many manufacturing systems the basic module for reconﬁguration will be a 3-axis CNC machine tool—a commodity product whose cost has signiﬁcantly fallen in recent years, while accuracy and reliability have improved。 However, in research one must consider a variety of alternatives。 Consequently, this paper will discuss the concept of a reconﬁgurable machine tool (RMT), which brings the ‘granularity’ of reconﬁguration down from the machine level to the component level。 Reconﬁguration at the component level, as in RMTs, raises