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.
Inertial Navigation System (INS) is actually an unstable system. Affected by some kinds of error sources, such as inertial measurements sensors, initial misalignments, INS outputs contain three kinds of periodic oscillation errors. It is a very effective way to add damping network in the Platform INS. This method can also be used in the Strapdown INS (SINS). The advantage of using this method is that...
As the diversity and complexity of targets, which is the key to gain images feature of the well descriptive and identifiability in image identification and target tracking problems. In this paper, adopting Hu moment invariants, Zernike moment invariants and Affine moment invariants respectively extract the moment eigenvalues in different deformation pattern of aircraft images, analyzing and comparing...
The dynamics mathematical model of the driving wheel of vibro-roller-soil system is established, and the theoretical analysis and the simulation research of continuous detection for vibro-roller compactness are carried on. The relations of the vibrating wheel acceleration, the compact soil rigidity and damping are obtained; and then the method of measuring compactness indirectly through detecting...
In this paper, 2D finite element method is used to calculate the static characteristics of switched reluctance motor, such as the electromagnetic normal force, flux-linkage and torque-angle-current characteristics. The system model is build to study the vibration dynamic response which is excited by electromagnetic force. Because vibration is a major problem of switched reluctance motor drive system,...
Most of planetary rovers have 6 wheels, and a symmetric statically determinate configuration is adopted. This special feature makes rover being unable to overcome ditches and vertical obstacles. A new six axes indeterminate configuration of asymmetric lunar rover is proposed in this paper, and a prototype rover is made. Several important technical problems in lunar rover development, such as the capability...
In this paper a new method based on the techniques of virtual prototype and optimization algorithm to redesign the suspension system of tracked vehicle is proposed. Firstly the multi-body dynamic model of the vehicle before refitted is established and validated through the field test. Then the refitted virtual prototype model is established from the validated model. To be satisfied with the refitment...
In free-flying space robotic system, the thruster jets will compensate the disturbances induced by manipulator to keep the attitude of the robot base invariable. For saving the expensive fuel that thruster jets cost, point-to-point path planning method in joint space for minimizing base reaction is proposed in this paper. The sinusoidal and polynomial functions are used here to parameterize the joint...
Chaotic synchronization can be transformed to design a suitable control law for the asymptotic stability of chaotic synchronization error system at the origin. It's necessary to discuss an approach of chaotic synchronization based on exponent stability, for exponent stability is one of more superior asymptotic stability types. A theory of exponent stability was introduced into chaotic synchronization,...
In this paper, we proposed several primate-inspired communication mechanisms including delayed-and-relayed, scent-trail, and communications among robots. We analytically model and simulate the scent-trail communication. We assume that robots (mobile sensors or mobile actuators) are capable of deploying /throwing-out sensors/RFID tags.
Proposing a theoretical model of calibrating the large-scale unit to its center which is based on the PSD, which is acronym for position sensitive detector, and photoelectric technology. The principle of least square method is applied to the multi-spot fitting the center of the bearing shell and the spatial straight line for optimum calibrating. The numeral partial-differentiation equations set are...
In Single Frequency Networks, the effect of intersymbol interference (ISI) and inter-carrier interference (ICI) is great due to the delay spread of wireless channels is much longer than a cyclic prefix (CP) .The performance of OFDM systems is degenerating seriously. This paper discusses a receiver design based on the implementation of a Decision Feed-back Equalizer (DFE). The proposed DFE receiver...
Artificial contaminations tests proved that there is a complicated nonlinear corresponding relationship between the acoustic emission signals emitted by the polluted insulators and the development of contamination discharge. In order to analyze the acoustic emission signals emitted by polluted insulator discharge effectively and estimate the contamination discharge status on the insulator surface...
In the force control of multi-functional prosthetic hands, it is important to extract grasp force information besides mode specifications directly from the myoelectric signals. In this paper, a force sensor is adopted to record the hand's enveloping force when the hand is performing several grasp modes, synchronously with 6 channels surface electromyography (EMG) which are extracting from the subject's...
A new inverse kinematic solution for serial robot manipulators is represented in this paper. Major aims of this paper are to obtain singularity avoiding inverse kinematic solutions and formulize kinematic problems in a compact closed form. Our solution method is based on screw theory and it uses quaternions as a screw motion operator. Screw theory methods based on line transformation. All screw motions...
A in-pipe robot power self-supported by the fluid media in the pipeline was developed. Speed control system was model analyzed and the relationship between the load that affect the speed stability and through-flow area was derived, and the speed control system including double closed-loop feedback part was built.
Based on the operating characteristics of pump load, the hydraulic speed regulation is widely used in the high-power pump load to realize the speed regulation and energy saving. This paper analyzes the energy saving features of the currently-adopted hydraulic speed regulation method in the high-power pump load and the inevitable power loss problems. According to the fundamental features of differential...
Learning Vector Quantization (LVQ) network is presented to analysis the fault of power transformer. The oil gases extracted from transformer oil form the input vector of LVQ network. The connection weights vector is determined with teacher guide. Compared with radius function neural network (RBFNN), LVQ network is easy to perform with high efficiency. In order to improve the classification accuracy,...
A dynamics model of the three axis air bearing based platform including the unbalance torque of the gravity and the other disturbing torque was built up. After the simulation of the platform motion with some representative moment model, a method based on the dynamics inversion was proposed to compute the unbalance torque. With continuous wavelet transformation (CWT), the disturbing torque could be...
This paper presents the techniques about microhole abrasive flow machining techniques of the abrasive flow machining crafts through controlling the relative motion between the workpiece and the abrasive flow by controlling motion speed of the abrasive cylinder piston, and improving machining accuracy and efficiency. Abrasive flow maching through motor-driven the abrasive cylinder piston is achieved...
The finite element method was utilized in this paper to analyze multifunctional structures on airborne electronic equipment. The results of this analysis show that the strengthened tendons can improve the inherent frequency of the structure, the density of screws arrangement can also affect its inherent frequency, and the circuit of elements should be placed symmetrically. Finally a new type of multifunctional...
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.