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In order to study the influence of vertical grounding electrode on impulse grounding resistance of substation ground network, the grounding model was built in COMSOL, and the impulse grounding resistances of substation grounding grid in different distribution, length and quantity of vertical grounding electrode were simulated and calculated. The results show that the closer the vertical ground to...
This paper introduces a novel method of measuring vibration displacement using three axes accelerometer, which effectively overcomes the shortcomings of traditional measurement method based on single axis accelerometer. Firstly, the frequency domain method is used to remove the trend items and noises in the three axes acceleration signals. Then, the three axes accelerations are fused for the resultant...
In view of multifarious power quality problems in the electrical railway power system (ERPS), an asymmetrical connection balance transformer (ABT)-based power quality control system (ABT-PQCS) is presented in this paper. The back-to-back converter which is connected to the system through the step-down transformer can eliminate the negative sequence current (NSC), compensate reactive power at the same...
We present trajectory tracking and balance control of an autonomous bikebot. The bikebot is a single-track autonomous mobile robot that is designed to study unstable physical human-robot interactions. The controller is built on the property of the external-internal convertible (EIC) structure for the bikebot dynamics. We present two types of the designs and analyses of the control systems and also...
In this paper, a cascade PID feedback control algorithm is proposed to stabilize the attitude of a quadcopter so that the balancing state can be ensured in spite of disturbances. A mathematical model of quadcopter dynamics is developed by applying Newton-Euler method. It reveals the exact relationships among all the variables involved. Both linear and nonlinear state-space equations are derived afterwards,...
In this article, a new dynamic neural network is developed to model the crack growth process of aluminum alloy under variable-amplitude loading condition. The proposed neural model is incorporated with the feedback loops at the output layer. This model can thoroughly address the dynamics as well as the relationship between the crack growth and variable-amplitude cyclic stress excitations of aluminum...
Postural balance control of machines is one of the most important human motor skills. We present a balance equilibrium manifold (BEM) concept to study how a human rider balances a bicycle-like robot (i.e., bikebot) while maintaining tracking a desired trajectory. The BEM is built on the external-internal convertible (EIC) structure of the rider-bikebot dynamics to capture the balance properties of...
Cloud-based video encoding has become more and more popular in Internet, especially for mobile clients, considering their limited resources. Recently, GPUs (Graphics Processor Units) make the cloud-based video encoding more economic and efficient. However, the motion estimation in inter prediction, which usually occupies about 70% encoding time in H.264/AVC, is still a big headache because of its...
Lifelong learning and continuing education are the need of social development and the improvement required by society. This paper gives them a new relationship that the two is dialectical unity, namely they are different, related and mutually developed. Continuing education should be carried out throughout people's whole life via various kinds of ways to promote lifelong learning. This paper states...
Understanding how human balance and control bicycles is helpful for not only designing bicycle-based rehabilitation devices but also studying physical human-machine interactions. We present stability analysis of a rider-bicycle system under the rider's steering and upper-body movement balancing controls. The dynamic model of rider-bicycle system is first constructed to integrate the rider's upper-body...
To meet the photoresist removal requirements in wafer level packaging (WLP) technology, low cost stripper formulation with robust performance need to be developed. Reduced de-ionized water (DIwater) content in the stripper formulation is one of the main strategies to achieve good performance for current commercial products. In strong alkaline formulation with pH20>12, higher content of DIwater...
This paper studies the multi-purpose redundant degrees of freedom (DOF) dual-arm robot modular joint design and error analysis. Dual-arm robot manipulator is composed of seven modular joints and the precision of each modular joint design is the basis of the mechanical arm function. The performance of the robot need joint lightweight design, good flexibility, high precision, to meet the needs of high...
We present the development of the gyroscopic-balanced control of an autonomous bikebot. The bikebot is an actively controlled bicycle-based robotic platform with a gyro-balancer developed to study human dynamic postural balance motor skills through unstable physical human-robot interactions. We also present a dynamic model and analysis for stationary bikebot. A nonlinear balancing controller is designed...
Based on the essence of Chinese Confucianism, this article extracted characteristics fitting CNPC overseas culture to further complement and improve the corporate culture in overseas operation of CNPC, thus laying the ideological and cultural foundation for CNPC overseas oil and gas business by leaps and bounds.
With comprehensive analysis towards the status quo of CNPC overseas oil and gas business and the dilemma faced by current leaders and cadres, this article tries to find out demand elements of the training of leaders and cadres suitable for further development of CNODC, and present constructive suggestions and opinions to provide management talent for sustainable development of CNODC.
Underwater autonomous gliders (UAG) such as Slocum electric gliders provide an effective platform and tool for marine and coastal scientists to conduct prolonged missions over weeks or months. However, localization of these gliders underneath ocean surface is challenging due to the lack of inexpensive, effective underwater positioning sensors. In this paper, we present a dynamic model-based localization...
In this paper, we present an adaptive particle size setting method in Lagrangian-approach based screen space splatting algorithm in real-time fluid rendering. The particle radius will be adjusted according to its Weber number and local density in the rendering process so that a large radius of peaceful fluid particle can help to eliminate a bumpy surface artifact, and a small radius can prevent obviously...
Residence time is an essential transport time scale in estuary, and it was calculated for five boxes in Daliaohe Estuary during dry, normal and rainy seasons using a three-dimensional convection-diffusion model based on FVCOM. The results show that the tracer would take about 25 days to get to the river mouth during the dry season, 14 days for the normal season, but only 8 days are needed for the...
This paper analyzes the dynamics of an offshore boom crane and proposes a high-performance nonlinear controller to drive the system states to track some constructed trajectories. Specifically, by employing Lagrange's method in an attached frame, a dynamic model is obtained for the offshore crane system consisting of the boom and the payload, with specific emphasis on the effect of the vessel's motion...
The effect of three kind latent curing agents (methylhexahydrophthalic anhydride, dicyandiamide and phenolic resin) on the performance of isotropy conductive adhesives were investigated. The thermal stability, lap shear strength, volume resistivity of ECAs were tested and the reliabillity of its application in LED was also evaluated. It was found that the ECA with MeHHPA as hardner showed the best...
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