An analytical design for three circular-arc cams

Lanni, Chiara; Ceccarelli, Marco; Figliolini, Giorgio

doi:10.1016/s0094-114x(02)00032-0

Cited by 22 publications

(17 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Daire yayı, kam tasarımda en çok kullanılan yöntemlerinden biridir [8][9][10][11][12]22] Kam profillerinin tasarımında iki temel amaç göz önünde bulundurulmalıdır. Bunlardan biri supabın mümkün olan en düşük ivme ile çalışmasını sağlamaktır.…”

Section: Daire Yayı Ve Fourier Serisi Ile Ekstrapole Edilmiş Kam Profunclassified

Homojen Dolgulu Sıkıştırma İle Ateşlemeli Bir Benzin Motoru İçin Kam Tasarımı Ve İmalatı

Çınar¹,

Uyumaz²

2014

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

ÖZETBu çalışmada, homojen dolgulu sıkıştırma ile ateşlemeli (HCCI) bir benzin motoru için kam tasarımı ve imalatı yapılmıştır. 38 mm temel daire çapı ve 124° supap açık kalma süresi için, HCCI yanma karakteristiğine uygun 3,5, 5,5 ve 7,5 mm düşük supap kalkma miktarına sahip kamlar tasarlanmıştır. Dairesel yay eğrisi kullanılarak kam profillerinin genel geometrik modelleri elde edilmiş ve elde edilen kam profili modelleri fourier serisi ile ekstrapole edilerek daire yay eğrisine karşılık gelen eşitlikler türetilmiştir. Tasarlanan kam profilleri için iticinin hız, ivme ve sıçrama etkileri araştırılmıştır. Elde edilen sonuçlar 5. dereceden klasik spline yöntemi ile elde edilen kamlar ile mukayese edilmiştir. Klasik spline fonksiyonları ile elde edilen kam profillerinde supap kalkma miktarı arttıkça kamın iticiye tek noktadan temas özelliğinin kaybolduğu, iticilerin ivme ve sıçrama değerlerinin çok fazla arttığı görülmüştür. Geometrik modeli elde edilen kam profillerinin fourier serileri ile ekstrapole edilmesiyle, yüksek supap kalkma miktarlarında bile kamın iticiye tek noktadan temas etme özelliğinin kaybolmadığı, düşük hız ve ivme ile çalışması sonucu sürtünme ve atalet kuvvetlerinin azaldığı görülmüştür.Anahtar kelimeler: HCCI yanma, kam tasarımı, üç dairesel yay eğrisi, fourier serisi, spline metodu CAM DESIGN AND MANUFACTURING FOR A HOMOGENEOUS CHARGE COMPRESSION IGNITION GASOLINE ENGINE ABSTRACTIn this study, cams were designed and manufactured for a homogenous charge compression ignition (HCCI) gasoline engine. Low lift cams were designed accordance with HCCI combustion characteristics for 38 mm base circular diameter, 124° dwell angle, 3.5, 5.5 and 7.5 mm valve lifts. Generic geometric models of cam profiles were obtained using circular arc curves. Obtained models were fitted with fourier series and circular arc curve was derived from the corresponding equations. Speed, acceleration and jerk effects of the follower were investigated for designed cam profiles. Obtained results were compared with cams obtained by 5 th degree classical spline method. It has been shown that feature a single point of contact of cam into the follower has been lost and acceleration and jerk values of the follower increased so much as long as valve lift increase in the cam profiles obtained by classical spline functions. It has been shown that feature a single point of contact of cam into the follower has not been lost by fitting fourier series of obtained geometric model of cam profile even high valve lifts. Friction and inertia forces decreased due to the low speed and acceleration operation.

show abstract

Section: Daire Yayı Ve Fourier Serisi Ile Ekstrapole Edilmiş Kam Profunclassified

Homojen Dolgulu Sıkıştırma İle Ateşlemeli Bir Benzin Motoru İçin Kam Tasarımı Ve İmalatı

Çınar¹,

Uyumaz²

2014

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

show abstract

“…The circular-arc cams are easy to design, manufacture, and test, which makes them cheaper than others [29, 30]. Cardona et al [31] studied two constant-breadth cam mechanisms and presented the equations for calculating the cam breadth when the translating follower is eccentric with an inclination, the radius of curvature of its profile and the sliding velocities of constant-breadth cam mechanisms with translating and oscillating followers.…”

Section: Introductionmentioning

confidence: 99%

Conceptual Design and Computational Modeling Analysis of a Single-Leg System of a Quadruped Bionic Horse Robot Driven by a Cam-Linkage Mechanism

Wang

Zhang

Wang

et al. 2019

Applied Bionics and Biomechanics

View full text Add to dashboard Cite

In this study, the configuration of a bionic horse robot for equine-assisted therapy is presented. A single-leg system with two degrees of freedom (DOFs) is driven by a cam-linkage mechanism, and it can adjust the span and height of the leg end-point trajectory. After a brief introduction on the quadruped bionic horse robot, the structure and working principle of a single-leg system are discussed in detail. Kinematic analysis of a single-leg system is conducted, and the relationships between the structural parameters and leg trajectory are obtained. On this basis, the pressure angle characteristics of the cam-linkage mechanism are studied, and the leg end-point trajectories of the robot are obtained for several inclination angles controlled by the rotation of the motor for the stride length adjusting. The closed-loop vector method is used for the kinematic analysis, and the motion analysis system is developed in MATLAB software. The motion analysis results are verified by a three-dimensional simulation model developed in Solidworks software. The presented research on the configuration, kinematic modeling, and pressure angle characteristics of the bionic horse robot lays the foundation for subsequent research on the practical application of the proposed bionic horse robot.

show abstract

“…Ceccarelli et al (2005) examined the design and characterization problems of circular-arc cams. Lin et al (2017) discussed a new method based on the nonlinear least squares for the investigation of discontinuity or nonsmoothness that may occur at the arc joining points of the circular arc cams. Lanni et al (2002) tried to obtain the most suitable cam profile by designing three circular arc cam profile by analytical method.…”

Section: Introductionmentioning

confidence: 99%

“…Lin et al (2017) discussed a new method based on the nonlinear least squares for the investigation of discontinuity or nonsmoothness that may occur at the arc joining points of the circular arc cams. Lanni et al (2002) tried to obtain the most suitable cam profile by designing three circular arc cam profile by analytical method. Hsieh (2010) derived the design equations by forming a general geometric model of three circular arc cam profiles.…”

Section: Introductionmentioning

confidence: 99%

Dimensionless design approach to translating flat faced follower mechanism with two-circular-arc cam

Arabacı

2019

Mech. Sci.

View full text Add to dashboard Cite

Abstract. In this study, a dimensionless design approach was presented for translating flat-faced follower mechanism with two-circular-arc cam. Instead of second arc radius (r2), maximum follower lift (smax) and angle of the cam rotation angle (2θmax) variables from the cam profile design parameters were made dimensionless using r2∕r (=λ), smax∕r (=ψ) and θmax∕π (=μ) respectively. Equations for cam profile and follower movement were derived and graphics were obtained depending on the dimensionless parameters. λ and ψ should be in the range [0.0, 1.0], but μ should be in the range [0.0, 0.5]. λ and ψ were changed in the range [0.10, 0.90] and μ in the [0.25, 0.45] range and λ, ψ and μ values were determined for the cam profile. Maximum velocity (vmax), maximum absolute acceleration (amax) and average follower lift (save) changes, which are one of the critical characteristics of follower, were examined for possible cam profiles according to the change of λ, ψ and μ. As a result, vmax and save decreased when μ was increased, vmax and save increased and amax decreased when ψ was increased, amax and save increased when λ was increased.

show abstract

An analytical design for three circular-arc cams

Cited by 22 publications

References 2 publications

Homojen Dolgulu Sıkıştırma İle Ateşlemeli Bir Benzin Motoru İçin Kam Tasarımı Ve İmalatı

Homojen Dolgulu Sıkıştırma İle Ateşlemeli Bir Benzin Motoru İçin Kam Tasarımı Ve İmalatı

Conceptual Design and Computational Modeling Analysis of a Single-Leg System of a Quadruped Bionic Horse Robot Driven by a Cam-Linkage Mechanism

Dimensionless design approach to translating flat faced follower mechanism with two-circular-arc cam

Contact Info

Product

Resources

About