Study of Fault Identification of Clearance in Cam Mechanism

Xue-fang, Chang; Hong-xia, Pan; Jiang, Xu; Wang, Tong

doi:10.3390/app12157420

Cited by 3 publications

(2 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wang [32] analyzed the influence of the clearances from a distribution mechanism with a cam and a translating flat-faced follower and showed that the clearance between the valve and its seat determines impact between the valve and its seat, loss in the follower-cam contact, and impact between the follower and the cam. Chang et al [43] proposed a new fault diagnosis method in relation to the clearance and recoil of the cylinder cam mechanism. The method is based on the Variational Box Dimension Kernel Fuzzy Mean Clustering Algorithm (VK algorithm), which combines the variational mode decomposition and fractal box-counting dimension (VMD-FBCD), and the fuzzy clustering algorithms were determined with a kernelized Mahalanobis distance (KMD-FC).…”

Section: Introductionmentioning

confidence: 99%

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Merticaru

Nagîţ

et al. 2023

Machines

View full text Add to dashboard Cite

Cam mechanisms, covering a large structural variety, are widely used in machinery, mainly as components of automated systems. Their functioning behavior is affected by negative dynamic phenomena determined by specific high velocities and acceleration rates. Within the various types of research on the dynamic behavior of cam mechanisms, this study addresses the need to clarify the influence of geometrical parameters and technological conditions on some indicators of the jump phenomenon in contact loss for a cam-follower mechanism. This particularly developed case study referred to a mechanism with a profiled grooved disk cam and oscillating follower. To highlight the influence of the cam-follower contact elasticity on the jump phenomenon, two dynamic models were developed: one considering rigid elements in contact and the second considering elastic cam-follower contact. The models were tested within a virtually simulated experiment, and the numerical simulation results evidenced the influence of input factors like the applied load on the mechanism, the clearance in the cam-follower kinematic pair, and the rotational speed of the cam, and the inertia moment was reduced to the follower on some indicators of the jump phenomenon. Validation FEA and experiments were performed, proving the reliable appropriateness of the dynamic model based on elastic cam-follower contact.

show abstract

Section: Introductionmentioning

confidence: 99%

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Merticaru

Nagîţ

et al. 2023

Machines

View full text Add to dashboard Cite

show abstract

“…Chang et al developed a new fault diagnosis method of the variational box dimension kernel fuzzy mean clustering algorithm to analyze a positive stress and friction force change at high speeds of the roller group. The clearance between the main roller and the cylinder cam and the massive friction force between the main roller and the cam curve slot are the main wear factors in theoretical analysis and test experiments [9]. The geometric nonlinearity of the dynamic model is studied for a planar five-links hinge lever mechanism in which the link deformation is assumed to be finite.…”

Section: Introductionmentioning

confidence: 99%

Symmetry and Asymmetry of Chaotic Motion in a Crank Arm and Connecting Rod Due to the Movement of the Follower

Yousuf

2023

Symmetry

View full text Add to dashboard Cite

The symmetry and asymmetry of chaotic motion in the planar mechanism is investigated for a crank arm and connecting rod due to the motion of a flat-faced follower. The level of chaos is investigated using the conception of the Lyapunov exponent parameter and phase-plane diagram at different cam speeds with and without the use of coefficients of restitution. Moreover, the fast Fourier transform (FFT) of power spectrum analysis technique is used based on SNR factor values at different cam speeds and different coefficients of restitution. The wave forms and histograms of nonlinear responses are analyzed using the SolidWorks program for the crank arm, connecting rod, and flat-faced follower. There is a clearance between the flat-faced follower and its guides while the oscillation motion of the crank arm and connecting rod is described as the motion of a double pendulum. The level of chaos is increased with increases in the cam speeds and coefficients of restitution.

show abstract

Study on lubrication characteristics of multi-layer structure hinge under the influence of clearance dynamic

Zhai,

Huang,

Xing

et al. 2024

Physics of Fluids

View full text Add to dashboard Cite

This paper presents a methodology for investigating the lubrication characteristics of multi-layer structural mechanical hinges based on clearance dynamics. By multi-layer hinged structures, we mean the four mediums: the journal, lubricating oil film, bearing sleeve, and connecting rod. Initially, a dynamic model that incorporates clearance is established using the automatic dynamic analysis of mechanical systems, revealing that the primary contact area is located between 50° and 70°. Subsequently, a lubrication model for the multi-layer structural mechanical hinge is constructed using ANSYS FLUENT software, which demonstrates the effects of critical parameters—such as contact angle, sleeve installation angle, inlet pressure, and shaft neck speed—on lubricant flow, pressure, and void fraction. The findings indicate that the motion offset angle significantly influences the pressure distribution within the oil film area, with high-pressure and low-pressure zones oriented counterclockwise and clockwise, respectively, relative to the offset angle axis. Furthermore, as the distance between the offset angle and the oil inlet increases, the volume fraction of cavitation decreases from 1.77% to 1.16%. When the sleeve installation angle aligns with the motion offset, the volume fraction of cavitation reaches 1.9%. Conversely, when the assembly angle aligns the oil inlet hole with the injection hole, the volume fraction of cavitation is minimized to 0.36%, resulting in an approximate performance improvement of 81.11%. This study provides a theoretical foundation for optimizing the lubrication design of multi-layer structural mechanical hinges and offers substantial guidance for the lubrication of mechanical hinges.

show abstract

Study of Fault Identification of Clearance in Cam Mechanism

Cited by 3 publications

References 22 publications

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Analytical, Numerical and Experimental Analysis of a Positive Displacement Cam Mechanism—A Case Study

Symmetry and Asymmetry of Chaotic Motion in a Crank Arm and Connecting Rod Due to the Movement of the Follower

Study on lubrication characteristics of multi-layer structure hinge under the influence of clearance dynamic

Contact Info

Product

Resources

About