ESDU 06002 provides guidance on the selection of cam laws
\nsuitable for Dwell-Rise-Fall-Dwell (DRFD) and Dwell-Fall-Rise-Dwell
\n(DFRD) output motions having equal rise and fall periods, including
\nones having an intermediate constant-velocity component in both the
\nrise and fall actions. The Item extends the scope of Item 82006
\nthat deals with the selection of DRD cam laws.<\/p>\n
This Item can be used to define DRFD or DFRD motions formed from
\neither a single cam law or from blended components of suitable cam
\nlaw.<\/p>\n
The displacement curve for the follower rise is a mirror-image
\nof that for the fall. The procedure used for blending cam profiles
\nensures continuity of follower displacement, velocity and
\nacceleration with infinte jerk throughout the motion. The approach
\nof deriving a DRFD motion from a DRD rise succeeded immediately by
\na DFD fall is inferior because the follower acceleration of DRD
\nmotions must be zero at both limits of travel to avoid infinite
\njerk. Hence these motions would have unnecessarily high
\naccelerations and be liable to induce vibration. Instead, the DRFD
\nand DFRD cam laws given in this Item make the output acceleration
\nan absolute maximum at the cam angle where the follower
\ndisplacement equals the lift, co-incident with the reversal of
\nvelocity.<\/p>\n
The cam laws to be found in ESDU 06002 generate the equations of
\nmotion for the rise or fall segment of a DRFD motion as continuous
\nfunctions and include: Double Harmonic Motion, Triple Harmonic
\nMotion, 2-4-5 Polynomial, 3-4-5-6 Polynomial and 3-5-6-7-8
\nPolynomial motions. Additionally, but suitable only for Components
\ncontrolling the reversal of velocity at the maximum follower
\ndisplacement of blended motion, the Constant-Cosine-Constant
\nAcceleration Motion is included.<\/p>\n
Output motions having asymmetric rise and fall periods are
\nanalysed in companion ESDU 06003 and examples are provided in ESDU
\n06004. The use of an associated computer program, described in ESDU
\n06005, is recommended for all calculations including sensitivity
\nanalyses to optimise the motion.<\/p>\n","protected":false},"excerpt":{"rendered":"
Dwell-Rise-Fall-Dwell and Dwell-Fall-Rise-Dwell Cam Laws – Sections 1 to 8: Segments Having Equal Rise and Fall Periods<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n ESDU<\/b><\/a><\/td>\n 2011-04<\/td>\n 74<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":557364,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-557356","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/557356","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/557364"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=557356"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=557356"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=557356"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}