The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper provides a simple approach for group consensus of networked gyroscopes systems from the analytical dynamics point of view. By using the Udwadia-Kalaba fundamental equation theory, a novel robust group control law is presented and a sufficient condition which ensure achieving group consensus of non-identical gyroscopes networks is given in this paper. Finally, numerical simulations conducted...
We investigate the problem of distributed source seeking with velocity actuated and force actuated vehicles by developing distributed Kiefer-Wolfowitz algorithm. First, based on stochastic approximation algorithm with expanding truncations, we present the distributed Kiefer-Wolfowitz algorithm, in which two noisy observations of each agent's objective function is used to estimate its gradient and...
Magnetic micromanipulation has the advantage of untethered control, high precision, and biocompatibility and has recently undergone great advances. The magnetic micromanipulation task to tackle in this work is to three-dimensionally navigate a 5-micrometer magnetic bead inside a mouse embryo and perform mechanical measurements at multiple locations. Existing technologies are not able to achieve these...
In mammalian embryo development, the first cell lineage differentiation produces an inner cell mass and trophoblasts. Although it was speculated in biology that mechanical forces facilitate the first cell lineage differentiation, due to the natural physical barrier formed by the zona pellucida (i.e., outer membrane of an embryo), there is no technology for directly measuring the mechanical properties...
The paper attempts to analyze the dynamic characteristics in the perfusion process of the hepatic vessel. A model of rugged vessel with a foreign matter was established based upon medical imaging data. The fluid flowing in the rugged vessel was simulated using the perfusion method of the symmetric pulsating flow (SPF) and the steady flow under the bidirectional fluid-structure interaction (FSI). The...
This article aims at investigating into the backgrounds, applications and the research progresses of micro/nano-robotics in biomedical applications both at home and abroad. Based on the above, the core technology is further summarized into fabrication, control, smart material, simulation, mechanism and biological medicine, etc. The urgently need to be solved, the challenges and the potential trends...
Mechanical force is an integral part of tissue morphogenesis and patterning. We have developed an automated micro-aspiration system to investigate how mouse limb bud tissue responds to extrinsic forces in order to understand whether tissue-generated forces can be a part of the mechanism causing oriented cell behaviors observed in mouse limb bud morphogenesis. The system is capable of performing automated...
While reduced whole cell stiffness has long been used to identify cancerous cells, cancer progression usually results in enhanced nuclear deformability as well. However, previous studies on nuclear mechanical properties were conducted either on isolated nuclei or intact nuclei indirectly, and intracellular characterization in situ has been missing. In this paper, an AFM technique to study nuclear...
In this paper, a new registration method that based on shape information and gray information has been introduced to the procedure of CT-MRI registration. In the first, the frames of the two images to be registered were explained by the principle of mechanics decomposition, then we coarsely registered the two images by their frames and as a result the error of the registration was limited in a small...
Since a parallel robot is always out of control at a singularity and its neighborhood, it should work far away from singular configurations. However, how to measure the closeness between a pose and a singular configuration is still a challenging problem. This paper presents a new measure for closeness to singularities of parallel robots. Several performance indices are introduced by taking into account...
In this paper, we propose a new “Intelligent Operation” concept for high voltage SF6 gas circuit breakers, in which the moving contacts are self-adaptively controlled from one position to an adjacent position to optimize the circuit breaker performance. To analyze and design the operation, a new model of high voltage SF6 gas circuit breaker is developed, and the moving characteristics of the new type...
The two-dimensional dimensional coupled implicit NS equations, the standard k-ε turbulent model and the Finite-Rate/Eddy-Dissipation reaction model were used to numerical simulate the flowfiled of the dual-mode scramjet combustor, including the engine ignited condition and the cold flow condition. At the same time, the influence of the injection modes, namely transversely and horizontally, on the...
This paper mainly focused on the theoretical studies of the linear rudder electric servo loading system. The mathematical model of motor servo loading system is established. Then, the disturbance force which would influence the system's dynamic performance is analyzed. In order to improve the accuracy of loading system, a feedforward-PID control algorithm is proposed. The algorithm can improve the...
The protein adsorption is a crucial but complex phenomenon in many applications, like biosensors, biomaterials. The amount, orientation and biological activity of adsorbed proteins are heavily dependent upon the structure of protein, like widely-applied Bovine Serum Albumin (BSA), and the properties of the substrate. At some extent, to explore the physicochemical properties and dynamics interaction...
This paper addresses the dynamic modeling of a novel 3-PSP 3-DOF spatial parallel manipulator, which is used as a tool head for high speed machining of structural aircraft components. Hereby, the dynamic analysis of the manipulator is very important. Based on the kinematic analysis, the dynamic equation without considering parasitic motions is derived by using the Newton-Euler approach. Since the...
Being as the counterparts of serial robots, parallel manipulators are good at force transmission but not only dexterous manipulation. In this study, a generalized frame-free transmission index is first proposed. Based on the frame-free index, the force transmission performance analysis of spherical 5R parallel manipulators is presented. By giving a specified and significative value, the index can...
Magnetometers used in the measurement-while-drilling (MWD) usually suffer from the deviation of the earthpsilas magnetic field by a variety of external factors, and they are expensive and heavy. The solid vibration gyro based on Micro-quartz material, as a candidate to the Magnetometer surveying sensor in MWD, was presented in this paper. A rectangle shape vibrator supported by two rings was used...
This paper addresses the issue of performance evaluation of parallel manipulators. In the analysis and design process of parallel manipulators, the performance evaluation is the most important problem. The developed index will be fundamentally involved in the process, especially in that of optimum design. Although parallel manipulators have been extensively studied for more than twenty years, unfortunately,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.