Applied Mechanics and Materials Vol. 203

Abstract: In order to study the energy consumption feature when cornering for motorized wheels driving vehicles, the resistance force on the driving axle was analyzed. A creative method quasi-neutral steering was proposed for vehicle cornering. A motorized wheels driving vehicle model was established, and the simulation of constant speed cornering was performed when the yaw rate as the parameter to control the front-rear torque distribution and the lateral acceleration as the parameter to control the left-right torque distribution. The results indicate that no wheel slipping is happened when quasi-neutral steering. The torque on the rear outer wheel is more than other wheels, and the torque on the outer wheels is more than inner wheels. The power consumption decreases 1.15% by quasi-neutral steering.

Abstract: This study presents a model-based methodology based on structural analysis that has the potential of having a technological impact on the design of diagnostic systems for power systems. The methodology utilizes the analytical redundancy inherent in the system structure and provides a strategy for systematic and automatic evaluation of power system topologies with respect to their monitoring (fault detection and isolation) potential.

Abstract: With the characteristics of intermittence and randomness, Wind, solar and other new energy generation connected to the grid need for coordination to ensure safety and stable operation of the grid. To this end, the paper uses of complementary of wind and solar resources to build a controllable new energy supply system. Through the rational use of electric vehicles energy storage device, propose a stochastic optimal decision method of hybrid power generation system, based on the theory of chance constrained. There are broad prospects for the effective use of renewable resources.

Abstract: A novel estimation method on Delta Engine Gas Temperature (DEGT) applicable for condition based maintenance of a certain military aero-engine was proposed in this paper to solve the problem that maintenance technique for national military aero-engine relatively fell behind. The application perspective of this proposed method in the condition monitor of military aero-engine was also discussed. The experiment analysis on a group of actual flight data indicated that the DEGT obtained via the proposed method was matched to the actual degeneration performance of the aero-engine, which could well reflect the condition of the aero-engine.

Abstract: The penetration of a large number of plug-in hybrid electric vehicles (PHEVs) has introduced severe challenges to power grid operation. In this paper, the grid-connected PHEV model is first proposed to reflect the charge/discharge property of PHEV. Then, a simulation approach is developed to study the probability distributions of the aggregate load and available vehicle to grid (V2G). capacity of PHEVs. Simulation results show that the charging and discharging capacities have the characteristic of normal distribution．

Abstract: In this paper, the slipping of belt conveyor for the normal stable operation and full load starting in between belt and rollers are investigated. The results illustrate that the resistance of the belt conveyor in the normal and stable operation is less than that of the full load starting operation due. The possibility of slipping in normal and stable operation is less than that of the slipping start running at full load condition. Therefore, in order to check the conveyor belt slipping, we should pay attention to the full load start condition, can not check under normal and stable operation of the skid. The application of soft-start technology to solve the problem of slipping when starting was also proposed.

Abstract: A bidding system of peak regulation right based on multi-agent is proposed according to the property of the peak regulation right. Then, the biggest goals of social benefits of all power generation companies are developed based on bidding system. Simultaneously bidding strategy of peak regulation right of the biggest goals of social benefits of all power generation company agents and internal cost optimization strategy of electricity generation companies are respectively raised for the goals. Example analysis shows that the proposed Bidding system takes on better viability and effectiveness.

Abstract: This paper proposed a navigation algorithm based on indirect square root kalman filter. On the basis of rigorous argument about the sensor measurement error, we established state error equation based on sensor random walk model and deduced the relationship between state error and steady-state component of acceleration and angular velocity. Considered the divergence of kalman filter in the update stage, we used square root kalman filter to calculate the true value of state error which can be used to correct the predictive value of state. In order to provide acceleration, angular velocity and velocity for the proposed algorithm, we installed an imu7200 within the drill bit and mounted an encoder on the wheel of the delivery tube device. Marine experiments in the east china sea show that the proposed algorithm can implement accurate location and attitude tracking of drill bit.

Abstract: A large amount of heat will be produced in the railgun launching process, the heat-induced temperature mutation is an important cause of material failure. To obtain temperature field variation law in railgun, mechanism of heat generation was analyzed according to the basic working principle of railgun. Temperature field was discussed through the method of combining theoretical calculations and Finite Element simulation. The results show that friction heat results in temperature rise on the materials only near the contact interface; temperature rise under the action of current heat around the corner of U-shaped armature is obvious, while maximum temperature is appeared at the side surface and exceeds the melting point of the armature material. The temperature of railgun mainly depends on the current value, while friction heat has smaller effect on it.

Abstract: An on-line method is proposed in this work to detect induction motor stator core fault by using stator negative sequence current. According to the existing abc coordinate model, a new equivalent circuit is obtained. In this circuit, the stator core loss each phase in normal state is modeled as core loss resistance symmetrically distributed among the three phases. The stator core loss is increased and is asymmetrically distributed among the three phases when a stator fault happens. The positive, negative and zero sequence equivalent circuits are drawn by a series of analysis of the circuit put forward above. It is demonstrated that there is a good correlation between stator core fault severity and the magnitude of the negative sequence current.