Article
Engineering, Mechanical
Hasan Bas, Yunus Emre Karabacak
Summary: In this study, modern machine learning algorithms were used to estimate the coefficient of friction and friction force in a cam follower mechanism. Three different ML algorithms (ANN, SVM, and GPR) were implemented to experimental tribological data to estimate the change in friction properties depending on the cam rotation angle. The results showed that ML models could effectively estimate the change in friction properties and the performance of different ML models varied. The FF-ANN model performed the best in estimating the friction force, while the FC-GPR model was more successful in estimating the coefficient of friction.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Ming Li, Wei Cheng, Ruili Xie
Summary: This paper introduces a passive quasi-zero-stiffness vibration isolator using a cam mechanism, which can generate ideal simplest restoring force directly and eliminate approximation errors. Experimental results confirm the proposed design principle and show the advantages of the QZS isolator in vibration tests, with wider isolation frequency bandwidth and weaker resonance effect compared to linear counterparts. The specific isolation efficiency and the effect of excitation amplitudes on vibration attenuation performance are comprehensively compared.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Automation & Control Systems
Yuzhang Wei, Qingsong Xu
Summary: Cell microinjection is crucial in the biomedical domain. A new force-sensing cell microinjector with novel compliant small-stiffness mechanism is proposed in this article, which enables high sensing sensitivity and large loading capability. The mechanism combines a constant-force mechanism with a small positive-stiffness mechanism to remove intercept force well.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Chemistry, Multidisciplinary
Xuefang Chang, Hongxia Pan, Jian Xu, Tong Wang
Summary: The clearance between the main roller and the cylinder cam has a significant impact on the functioning of the bolt. This study builds and analyzes a bolt model to achieve the clearance and recoil of the cylinder cam mechanism. The analysis of the leading dynamic roller group and dynamic bolt reveals the rapid change of positive stress and friction force on the high-speed leading roller group, influencing multiple aspects. The study identifies the assembling clearance and massive friction force as the main wear factors. Additionally, a new fault diagnosis method based on the VK algorithm is developed, which demonstrates higher accuracy and faster diagnostics compared to similar studies.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Fuliang Niu, Zhen Liu, Haibo Gao, Haitao Yu, Nan Li, Zongquan Deng
Summary: The study focuses on the dynamic constant-force performance in suspended astronaut micro-gravity simulation systems, and achieves enhanced system performance by improving lightweight low-stiffness mechanism and setting force adjusting mechanism.
MECHANISM AND MACHINE THEORY
(2022)
Article
Engineering, Mechanical
Zongdi Tong, Xiaozhi Zhang, Guangwei Wang
Summary: This paper presents an automatic optimization method for compliant constant force mechanisms, which eliminates the need for time-consuming parameter tuning and complex model design in the conventional design process. The proposed optimization framework is based on the finite-element analysis (FEA) and multi-objective genetic algorithm (MOGA) methods and is designed in two steps: preliminary mechanism design and optimization of the preliminary model using MOGA based on FEA results. The optimized model achieves the desired performance automatically, with a larger constant force stroke, as verified by FEA simulations and experimental studies.
Article
Engineering, Mechanical
Qingyi Zhang, Peng Yan, Haipeng Wang
Summary: This paper proposes a curved-beam based quasi-constant force mechanism that meets the requirements of force-sensitive manipulation. The analytical model and finite element analysis show significant performance improvement in the proposed design.
MECHANISM AND MACHINE THEORY
(2022)
Article
Engineering, Mechanical
Longyang Li, Jingfang Zhu, Zhixiang Zeng, Eryong Liu, Qunji Xue
Summary: The study investigates the motion of droplets on a super-hydrophobic surface, the adhesive force, and the angular acceleration in relation to the contact angle. The research shows that the droplets roll instead of slide, and the adhesive force and angular acceleration increase with an increased contact angle. The study also discusses the relationship between etching time, roughness, angular acceleration, and adhesion force of the contact angle.
Article
Engineering, Mechanical
Shiwei Liu, Gaoliang Peng, Zhixiong Li, Weihua Li, Kang Jin, Hongzhao Lin
Summary: Inspired by the nonlinearity of origami cartons, a novel origami-inspired constant-force mechanism (OriCFM) is proposed. It adds equivalent springs at horizontal and oblique creases of the rigid origami mechanism to achieve a stable constant force output. The mechanical model is established based on geometric relationships, and the influence of structural parameters and spring stiffness on the constant force characteristic of the OriCFM is analyzed. Experimental results demonstrate the feasibility and effectiveness of the proposed mechanism.
MECHANISM AND MACHINE THEORY
(2023)
Article
Computer Science, Information Systems
Qitao Lu, Jianming Wen, Yili Hu, Jianping Li, Jijie Ma
Summary: This paper introduces a novel battery-supplied piezoelectric actuator controlled by cam mechanisms, with its performance verified through a series of tests. The results show that the actuator operates stably with high precision and repeatability, providing a new idea for the integration of piezoelectric actuators.
Article
Automation & Control Systems
Bingxiao Ding, Jiyu Zhao, Yangmin Li
Summary: A novel constant force mechanism (CFM) based on positive and negative stiffness mechanisms is proposed for controlling contact force on workpieces during industrial deburring operations. The CFM can generate a constant force travel range without additional sensors or control algorithms. The design concepts, analytical model, FEA simulation, and experimental studies demonstrate the effectiveness of the proposed CFM for industrial applications.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Qi Chen, Qi Wen, Xianmin Zhang, Yong Yang, Suhua Xiao
Summary: This study analyzes the causes of buckling-induced instability and proposes methods to avoid this instability. By proposing a mechanism with three torsional springs and using topology optimization models with buckling constraints, stable compliant constant-force mechanisms can be designed.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Shosuke Sasaki, Yohe Namba, Tadao Iwanari, Yasuyuki Kitano
Summary: A new type of rolling resistance was discovered in Shinkansen trains, where the resistance at high speeds is four times larger than at low speeds. The reason for this increase was unknown until this paper, which explains that the stress in the contact area travels upwards and reaches the axle with a delay, affecting the stress distribution at high speeds. The paper presents a numerical solution to the recurrence equations governing the 3D-distributed stress, revealing a forward shift in the stress distribution from just below the wheel center. The frictional resistance calculated using this theory agrees well with experimental measurements on the Shinkansen 700 series.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Sang-Kon Lee, Kyung-Hun Lee
Summary: This study focused on designing die groove profile for cold pilger rolling process to predict rolling force in manufacturing seamless pipes. The theoretical calculations and experimental data verification indicated the successful application of the design method in controlling tube shape and tolerance accurately.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Rongrong Peng, Xingzhong Zhang, Peiming Shi
Summary: This study establishes a vertical-horizontal coupling vibration model of hot rolling mill rolls under multi-piecewise nonlinear constraints and investigates the amplitude-frequency characteristics and dynamic behavior of the rolls under different parameter settings to optimize the performance of the rolling mill.
Article
Mathematics
Francisco G. Montoya, Raul Banos, Alfredo Alcayde, Francisco M. Arrabal-Campos, Javier Roldan-Perez
Summary: In this paper, the power flows in electrical circuits are modeled in a mixed time-frequency domain using geometric algebra and the Hilbert transform for the first time. This novel mathematical framework overcomes the limitations of existing methodologies, which may result in non-optimal Root Mean Square (RMS) current and higher harmonic distortion. The proposed method is applicable to both sinusoidal and non-sinusoidal power supplies, nonlinear loads, and single- and multi-phase electrical circuits, providing compact formulation and meaningful engineering results. It also serves as an advanced tool for algorithm development in the power electronics field.
Article
Biochemistry & Molecular Biology
Antonia Lima-Rodriguez, Jose Garcia-Manrique, Wei Dong, Antonio Gonzalez-Herrera
Summary: A new non-destructive methodology for determining the mechanical properties of a membrane using vibro-acoustic tests is proposed in this work. The theoretical bases of the test were presented, including the complex mechano-acoustic coupling between sound waves and the membrane. An experimental test was conducted to evaluate the method's validity, providing satisfactory results and highlighting aspects to consider in future experiments.
Article
Engineering, Biomedical
Jose M. Muyor, Jose A. Antequera-Vique, Jose M. Oliva-Lozano, Francisco M. Arrabal-Campos
Summary: This study evaluated the changes in spinal posture and activation of core muscles during cycling. The findings showed that as the intensity of effort increased, there were significant increases in spinal flexion and inclination, as well as muscle activation in the core muscles.
SPORTS BIOMECHANICS
(2023)
Article
Engineering, Electrical & Electronic
Francisco G. Montoya, Francisco de Leon, Francisco Arrabal-Campos, Alfredo Alcayde
Summary: The paper presents a systematic method for identifying load circuit parameters based on instantaneous voltage and current measurements at the PCC, utilizing GA and concepts of differential geometry for a rigorous mathematical framework. Once passive elements are identified, the theory can be applied to compute active and reactive powers, with verification in linear and nonlinear circuits. The method is easy to program and has shown robustness in all tested cases, with potential applications beyond electric circuits.
IEEE TRANSACTIONS ON POWER DELIVERY
(2022)
Article
Engineering, Mechanical
Javier Gonzalez-Carbajal, Daniel Garcia-Vallejo, Jaime Dominguez
Summary: This paper investigates the dynamics of a Duffing oscillator excited by an unbalanced motor, considering the nonideal interaction between the motor and vibrating system. The phenomena of passage through resonance and resonant capture are studied, revealing the stability of stationary solutions.
NONLINEAR DYNAMICS
(2022)
Review
Chemistry, Analytical
Wilson Arrubla-Hoyos, Adelaida Ojeda-Beltran, Andres Solano-Barliza, Geovanny Rambauth-Ibarra, Alexis Barrios-Ulloa, Dora Cama-Pinto, Francisco Manuel Arrabal-Campos, Juan Antonio Martinez-Lao, Alejandro Cama-Pinto, Francisco Manzano-Agugliaro
Summary: The implementation of 5G technology in Colombian fields could enable smart farms, improving production and efficiency. Categorizing crops by regions and products is useful when designing 5G implementation plans and strategies based on budget availability and development plans.
Article
Engineering, Biomedical
J. Garcia-Manrique, Cosme Furlong, A. Gonzalez-Herrera, Jeffrey T. Cheng
Summary: This study presents a methodology for developing a finite element numerical model of the tympanic membrane based on experiments conducted on a cadaveric human temporal bone. Acoustically-induced transient displacements of the tympanic membrane surface are obtained using a high-speed digital holographic system, and the finite element model is generated and validated through numerical and experimental data correlation. Key material parameters defining the mechanical response of the tympanic membrane are identified through reverse engineering, and modal numerical simulations of the specimen are performed.
ACTA BIOMATERIALIA
(2023)
Article
Mechanics
Lauri Pyrhonen, Suraj Jaiswal, Alfonso Garcia-Agundez, Daniel Garcia Vallejo, Aki Mikkola
Summary: This study investigates the discrete extended Kalman filter for multibody systems and proposes an accurate formulation of the state-transition model. Based on the coordinate-partitioning method and linearization of multibody equations of motion, the proposed method utilizes the integration of states and estimator covariances without simplifying the integrator structure. The results show that the proposed method significantly enhances the stability of the state-transition model compared to forward Euler-based methods in the forward dynamics analysis of a four-bar mechanism. However, the computational efficiency of the novel method is lower due to the computation of the Jacobian matrix of the nonlinear state equation.
MULTIBODY SYSTEM DYNAMICS
(2023)
Review
Chemistry, Analytical
Alexis Barrios-Ulloa, Dora Cama-Pinto, Francisco Manuel Arrabal-Campos, Juan Antonio Martinez-Lao, Jose Monsalvo-Amaris, Audomaro Hernandez-Lopez, Alejandro Cama-Pinto
Summary: The deployment of 5G is progressing rapidly around the world, especially in North America and Asia. Its advantages and efficiency have been demonstrated in various fields. However, Latin America, specifically Colombia, lags behind in this process. The lack of available spectrum and delays in auction processes are the main obstacles to 5G deployment in Colombia.
Article
Agronomy
Dora Cama-Pinto, Miguel Damas, Juan Antonio Holgado-Terriza, Francisco Manuel Arrabal-Campos, Juan Antonio Martinez-Lao, Alejandro Cama-Pinto, Francisco Manzano-Agugliaro
Summary: The production of crops in greenhouses is crucial for meeting the world's future food demands. Wireless sensor networks (WSN) technology, supported by precision agriculture, plays an important role in monitoring agronomic parameters. This study proposes a method that utilizes Deep Learning to develop an empirical model for estimating radio wave attenuation through vegetation, taking into account the height and distance between WSN nodes. The model demonstrates high quality with a cross-validation parameter of R-2 0.966, and a generalized error of 0.920, confirming its reliability.
Article
Engineering, Multidisciplinary
Eugenia Arrieta Rodriguez, Luis Fernando Murillo Fernandez, Gustavo Adolfo Castanez Orta, Ana Milena Rivas Horta, Carlos Baldovino Barco, Kellys Jimenez Barrionuevo, Dora Cama-Pinto, Francisco Manuel Arrabal-Campos, Juan Antonio Martinez-Lao, Alejandro Cama-Pinto
Summary: This work presents the development of a software platform to monitor and manage inpatient safety by integrating advancements in biomedical, information, and communication technologies. It uses Scrum methodology and Internet of Things technology, and implements an RFID-based nurse call system, as well as integrates diet management to reduce adverse events.
Article
Engineering, Mechanical
A. G. Agundez, D. Garcia-Vallejo, E. Freire, L. Pyrhonen, A. Mikkola
Summary: This work presents a linearization approach for hydraulically driven multibody systems used in heavy machinery applications. The approach allows the linearization of equations of motion for general multibody systems with holonomic and nonholonomic constraints, including the hydraulic equations of the hydraulic subsystem. The validation of the approach is demonstrated through forward dynamics simulation and comparison with a conventional counterpart approach.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Guillermo Pacheco-Ramos, Daniel Garcia-Vallejo, Rafael Vazquez
Summary: E-sail technology is a continuous propulsion system using the repulsive force of solar wind protons on positively charged tethers. This study presents a dynamic multibody model combining ANCF and NC to describe flexible and rigid bodies. A complete formulation for cable elements considering nonlinear bending and internal damping is provided. The simulation results prove the importance of considering bending stiffness in accurately capturing the dynamics of the E-sail.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Javier Gonzalez-Carbajal, Daniel Garcia-Vallejo, Jaime Dominguez
Summary: This study investigates the influence of the Sommerfeld effect on the behavior of vibrocompacting machines driven by unbalanced electric motors. Using a simplified model with 4 degrees of freedom, the authors analyze the dynamics of quasistatic vibrocompaction processes and derive the characterization of the system state through a quasistatic torque curve. The results provide insights into the maximum achievable compaction and the motor torque required to reach desired compaction levels, as well as the specific manifestation of the Sommerfeld effect in the studied system.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
J. Lopez-Martinez, D. Garcia-Vallejo, A. Alcayde, S. Sanchez-Salinas, Francisco G. Montoya
Summary: This work establishes a comprehensive and systematic methodology for obtaining the electrical analogue of any mechanical system modelled by rigid bodies, springs, and dampers. The proposed method can deal with a combination of translational and rotational coordinates in the definition of the mechanical model. Additionally, the electrical analogue of a linear 3D 7-DOF full car model is presented to support the proposed method.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
