Design of an adjustable cam based constant force mechanism

Liu, Yang; Yu, Deping; Yao, Jin

doi:10.1016/j.mechmachtheory.2016.04.014

Cited by 38 publications

(18 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A confirmation of the expediency of using exactly the cam-lever mechanisms is theoretical interest in this type of mechanisms from different researchers [9,10] and its utilization in the applied directions [11,12]. In particular, as far as theoretical studies are concerned, it is interesting to note that there is a significant number of cam mechanisms that can be applied to ensure an accurate trajectory, or to direct the body through the precisely-defined infinite positions [9].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…In this case, the proposed synthesis method employs a method of the cycle complex closure and the envelope theory to find the axial line and contact points of the track. Paper [10] proposed an adjustable constant force mechanism (ACFM), which consists mainly of a linear spring and a cam mechanism for passive control over the contact force. It was noted that the proposed model of ACFM is simple and accurate because, in particular, it lacks complex flexible elements.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

See 1 more Smart Citation

Research into the process of mechanical formation of the upper part of a raw cotton bundle

Sailov¹,

Veliev

Kerimov³

2017

EEJET

View full text Add to dashboard Cite

Запропоновано метод кінематичного ана-лізу механізмів хлoпкопереробних машин, в тому числі механічного бунтоукладчика, та розроблено алгоритм його комп'ютер-ної реалізації. Метод дозволяє автомати-зувати процес отримання і рішення рівнян-ня для визначення кінематичних параметрів усіх елементів механізму при заданому зако-ні руху ведучої ланки. Експериментальним шляхом вивчена можливість формування верхньої частини бунту з необхідною щільніс-тю бавовни, що забезпечує стійкість формо-ваного бунту Ключові слова: бавовна-сирець, бунт бавов-ни, форма бунту, верхня частина бунту, кула-чок, щільність бунту Предложен метод кинематического ана-лиза механизмов хлoпкоперерабатывающих машин, в том числе механического бунто-укладчика, и разработан алгоритм его ком-пьютерной реализации. Метод позволяет автоматизировать процесс получения и ре-шения уравнения для определения кинемати-ческих параметров всех элементов механиз-ма при заданном законе движения ведущего звена. Экспериментальным путем изучена возможность формирования верхней части бунта с необходимой плотностью хлопка, что обеспечивает устойчивость формируе-мого бунта Ключевые слова: хлопок-сырец, бунт хлоп-ка, форма бунта, верхняя часть бунта, ку-лачок, плотность бунта UDC 3326.01

show abstract

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Research into the process of mechanical formation of the upper part of a raw cotton bundle

Sailov¹,

Veliev

Kerimov³

2017

EEJET

View full text Add to dashboard Cite

show abstract

“…An adjustable constant force mechanism has been proposed, which consists of a linear positive stiffness mechanism and a linear negative stiffness mechanism. The linear negative stiffness mechanism is obtained by using a cam mechanism, where the cam profile has been designed to generate a constant force output [16]. Similarly, a cosmetic glove stiffness compensation mechanism has been designed by using a negative stiffness element.…”

Section: Introductionmentioning

confidence: 99%

Bidirectional torsional negative stiffness mechanism for energy balancing systems

Zhang

Shaw

Amoozgar

et al. 2019

Mechanism and Machine Theory

View full text Add to dashboard Cite

A new concept of an integrated bidirectional torsional negative stiffness mechanism is introduced which allows for passive energy balancing of mechanical systems by reducing actuation requirements and improving energy efficiency. This novel design is a modular device, is bidirectional and is easily integrated and customised for different applications. The energy balance concept is achieved by employing a negative stiffness system to couple with a positive stiffness system of the mechanical system to create a zero stiffness system which can be driven with lower energy requirements. The bidirectional torsional negative stiffness mechanism proposed here uses a series of pre-compressed springs around a bidirectional torque shaft to convert decreasing force in the springs into increasing torque output through geometric reconfiguration to generate the negative stiffness characteristic. The kinematics of the negative stiffness mechanism were derived and a physical model was assembled from LEGO ® components for validation. An analytical model was developed for prediction and the numerical results showed that a satisfactory performance can be generated to match the torque requirements. An experimental demonstrator was then built and tested to verify the predictions from the analysis. To show the impact of the energy balancing concept on actuator efficiency, a representative case study is made of a tendon-driven morphing active camber mechanism. The performance of the optimised bidirectional negative stiffness device is investigated to shows an improvement by the kinematics tailoring.

show abstract

“…Recently, Liu et al. 25,26 designed novel adjustable cam-based CFMs, through the design of the parabola-like cam profile ignoring friction, the cam mechanisms can output well-performed constant force based on the simulation results.…”

Section: Introductionmentioning

confidence: 99%

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

Cheng

Xie

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

Due to the quasi-zero-stiffness and overload protection characteristics, constant-force mechanisms can be widely used in nonlinear vibration control, high-efficiency shock isolation, and other engineering fields. As a preparatory work for the further applications, this paper presents a cam-based constant-force compression mechanism and validates the quasi-static characteristics experimentally. By employing the friction considered profile identification method to design the cam and through the interaction between the cam and spring-sliders, the constant-force compression mechanism can passively output the desired constant force over a sufficiently large displacement. The design theory is firstly introduced in detail. Through establishing and solving the differential relationship between the lateral elastic force and vertical constant force, the constant-force compression mechanism under various frictional conditions can be designed. Then, constant-force compression mechanism prototypes corresponding to sliding and rolling friction are designed, fabricated and tested respectively. The results show that both the prototypes have the satisfactory characteristics as with the design requirements. Moreover, the relative generality and stronger engineering applicability of the proposed friction considered profile identification method are proved since it can not only cover the frictionless (micro-friction) cases, but keep the constant-force behavior of the constant-force compression mechanism under the nonignorable friction conditions. Therefore, compared with the existing cam-roller constant-force mechanisms that must ensure the ignoring micro-friction demand, the presented constant-force compression mechanism taking friction into consideration has important engineering significance since it can reduce this machining requirement.

show abstract

Design of an adjustable cam based constant force mechanism

Cited by 38 publications

References 17 publications

Research into the process of mechanical formation of the upper part of a raw cotton bundle

Research into the process of mechanical formation of the upper part of a raw cotton bundle

Bidirectional torsional negative stiffness mechanism for energy balancing systems

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

Contact Info

Product

Resources

About