Design and experimental validation of a cam-based constant-force compression mechanism with friction considered

Li, Ming; Cheng, Wei; Xie, Ruili

doi:10.1177/0954406218806015

Cited by 20 publications

(8 citation statements)

References 30 publications

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“…Equation (4) can be expanded aswhere tan θ can be considered as the trajectory of the center of the slider contact end (Li and Cheng, 2018; Li et al, 2019a), which is a set of the intersections between Fsc and Fls during the movement of cam, as shown in Figure 3. Then, we can obtain the following relationwhere dy/dx=tan θ and Fls=kls(x+δ) has been substituted.…”

Section: Model and Design Principle Of The Qzs Isolatormentioning

confidence: 99%

“…Considering the transmissibility analysis in Section 3 that the large damping can reduce the isolation efficiency, the contact end of the slider with the cam in the NSM is assembled by a pair of rolling bearings with relative small friction in parallel with a diameter of 10 mm. We have determined the rolling friction coefficient as 0.018 via the same principle and testing setup in (Li and Cheng, 2018; Li et al, 2019a).…”

Section: Prototype and Experimentsmentioning

confidence: 99%

“…Figure 11(b)–(d) show the two-dimensional and three-dimensional design models and the steel-made physical prototype of the cam. Figure 11(a) also includes the dashed blue trajectory curve for the case that μ = 0 when ignoring friction and the red curve for μ = 0.17 corresponding to the sliding friction condition (Li et al, 2019a). From the comparison, it can be concluded that the difference between the defined curves corresponding to the rolling friction and the case of ignoring friction is relative small.…”

Section: Prototype and Experimentsmentioning

confidence: 99%

“…In the study by Li and Cheng (2018) and Li et al (2019a), using a profile-defined cam-slider mechanism, one can obtain the desired force through the squeezing between the cam and the spring-supported sliders with friction considered. Thus, the noncircular cam-slider mechanism can be regarded as a more general and practical force-regulation mechanism (Li et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

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Design and experiments of a quasi–zero-stiffness isolator with a noncircular cam-based negative-stiffness mechanism

Cheng

Xie

2020

Journal of Vibration and Control

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This article presents a quasi–zero-stiffness isolator with a cam-based negative-stiffness mechanism, where the cam has a user-defined noncircular profile to generate negative stiffness to counterbalance the positive stiffness of the vertical spring and yield the quasi–zero-stiffness characteristic around the equilibrium position. Unlike previous studies, the proposed quasi–zero-stiffness isolator has the preferable feature that the desired cubic restoring force can be directly obtained through the well-designed profile of the cam in the negative-stiffness mechanism with the friction considered during the model design, rather than through the Taylor expansion and friction-ignoring assumption, which can avoid the approximation error between the theoretical design and the specific realization. The pure-cubic nonlinear differential equation of motion of the quasi–zero-stiffness isolator is derived and solved with the harmonic balance method, followed by the discussion of the relevant dynamic characteristics. Experimental studies are carried out based on the physical prototype of the quasi–zero-stiffness isolator. The results show that the quasi–zero-stiffness isolator can greatly extend the isolation frequency bandwidth and has a much lower resonance peak. In the low-frequency band, the quasi–zero-stiffness isolator greatly outperforms the corresponding linear system but is equivalent or even inferior in the high-frequency range with the increase of excitation force.

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Section: Model and Design Principle Of The Qzs Isolatormentioning

confidence: 99%

Section: Prototype and Experimentsmentioning

confidence: 99%

Section: Prototype and Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and experiments of a quasi–zero-stiffness isolator with a noncircular cam-based negative-stiffness mechanism

Cheng

Xie

2020

Journal of Vibration and Control

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“…(2) Dynamic analysis The dynamic analysis was conducted on the cam on the working conditions based on the D'Alembert principle [23,24] and there are two main situations: 1) The cam is not subjected to the pressure of the plunger; 2) The cam is subjected to the pressure of the plunger. For the first condition, the dynamic analysis was conducted for the cam and the frictional resistance between the roller and the cam was ignored, as shown in Figure 6 [25][26][27] .…”

Section: Figure 5 Force Analysis Diagram Of Roller Followermentioning

confidence: 99%

Structure optimization of cam executive component and analysis of precisely applying deep-fertilization liquid fertilizer

Zhou

Wang

Tang

2019

International Journal of Agricultural and Biological Engineering

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Since there are some problems in the previous cam of deep-fertilization liquid fertilizer applicator, such as poor precision and low-fertilization performance, a method of the contour line of a cam was proposed based on Matlab GUI development platform. Bernoulli' equation between the liquid fertilizer and the pressure valve of the fertilizer-spraying needle was founded. Moreover, the motion angles of a rise travel and return travel were corrected and the corresponding parameters of the contour line of the cam were obtained. Equations of cam moving from rise travel to return travel were derived according to the simple harmonic motion. In addition, 3D model of cam was established by applying the Pro/E software and the rationality of the cam design was verified. The static analysis of the cam was carried out under working conditions and the corresponding dynamics analysis was performed based on D'Alembert's principle. And then relationships between the binding force and the drag torque were obtained. A bench test indicates that when the pressure of a hydraulic pump is 0.5 MPa and the velocity of a output shaft is 50 r/min, the average consumption of the fertilizer is 19.7 mL for each measurement, which meets the corresponding agronomic requirement, i.e. 20 mL. When the rotation angle of the cam is 8.6° and the rise displacement of a plunger is 0.84 mm, the mouth of the fertilizer-spraying needle sprayed liquid fertilizer as soon as it got into the soil and stopped spraying as soon as it got out of the soil. The results show that the designed contour line of the cam meets the requirement, that is, the mouth of the fertilizer-spraying needle should spray liquid fertilizer as soon as it gets into the soil and stop spraying as soon as it gets out of the soil, which meets the agronomic requirements, that is, fertilizer should be sprayed deeply and precisely. And this study lays a theoretical foundation for designing the cam of intermittent type distributor and provides relevant parameters.

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Practical design of the QZS isolator with one pair of oblique bars by considering pre-compression and low-dynamic stiffness

et al. 2022

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Design and experimental validation of a cam-based constant-force compression mechanism with friction considered

Cited by 20 publications

References 30 publications

Design and experiments of a quasi–zero-stiffness isolator with a noncircular cam-based negative-stiffness mechanism

Design and experiments of a quasi–zero-stiffness isolator with a noncircular cam-based negative-stiffness mechanism

Structure optimization of cam executive component and analysis of precisely applying deep-fertilization liquid fertilizer

Practical design of the QZS isolator with one pair of oblique bars by considering pre-compression and low-dynamic stiffness

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