Advanced Materials Research Vols. 490-495

Abstract: Separation section is the most complex and dramatic stage in disturbing the cruise missile during the entire flight trajectory. The characteristic of low-altitude, low-speed, non-aileron flight separation of the missile propelled by rocket was analyzed in this paper. Classic engineering methods and neural network dynamic inversion methods was used to design control system, and two different control methods were compared.

Abstract: A new smooth shifting control is worked out in response to problems existed in gear-shift control of the AG4 automatic transmission, and a new pattern of oil pressure change for the engaging elements during the transition stage is formulated. Dynamic motion equations for the AG4 automatic transmission are established using simulated lever system. The simulation test is done of the 2nd-3rd (3rd-2nd) gear-shift phase in AG4 automatic transmission by means of MATLAB/Simulink software. The result of which shows the change in amplitude of the output shaft angular acceleration and that of the degree of jerk are noticeably reduced when applying the new oil pressure pattern to control the process in the AG4 automatic transmission. Therefore, the smooth shifting control is achieved by reducing the shock subjected during gear-shift, and thus the gear-shift process is greatly improved.

Abstract: With the development of information technology, embedded systems have become a very hot topic in IT industry. The paper introduces the definition of embedded system, and discusses the structure and characteristics of embedded system. From the current embedded involves the application field, expounds the present situation of the development of embedded, anticipates the vast developing prospects of embedded System industrial in our country.

Abstract: DSP-based intelligent split-phase self-adaption reactive power compensation controller was designed to real-time monitor the dynamic reactive power compensation of power grid parameters. The controller uses the capture unit and A/D conversion unit of DSP chip to respectively complete the power grid frequency measurement and power grid signal sampling, which simplifies the hardware architecture of the system, adopts split-phase dynamic reactive power compensation technology, and guarantees the realization of reactive power compensation via compensation capacitor switching when the three-phase load is unbalanced. The operation results showed that this controller could real-time monitor the parameters of power grid, accurately and rapidly switch the capacitor set with no impact according to the operation status of power grid, making the power factor of load stay within the reasonable range, improving the supply power quality.

Abstract: Partial occlusion and non-rigid variation are challenging problems in object tracking. To address this problem, robust gradient part-based models are proposed for object tracking in this paper. Our models constructed multiple well-chosen parts based on the gradient energy map of the object. And the local optimization algorithm, mean shift, is used to search the best locations of the multiple parts, which can be used to rectify the location of the tracked object by weighted feedback. Meanwhile, the models of the root and parts are updated online, which can improve tracking accuracy and robustness. Further, our models are easy to be embedded into different tracking algorithms and we implement the mean shift based on gradient part-based models. Experiments results show that our gradient part-based models are robust enough for object tracking, even though the objects are non-rigid or occluded.

Abstract: The pure electric vehicles and hybrid electric vehicles are being developed and used wildly to save energy and reduce air pollution. In pure electric vehicles and hybrid electric vehicles, most of the steering hydraulic pump and braking sir pump have one electric motor to drive its pump. A new system with one electric motor for these two bumps was developed for application in pure electric vehicles（EVs） and hybrid electric vehicle ( HEVs). Comparison with conventional configuration, this new method can reduce cost and mounting space with compact size and higher energy efficiency. And the test results show that the new system can meet the requirements of HEV operation quite well.

Abstract: A verifiably encrypted signature scheme involves a signer, a verifier, and an adjudicator. It can convince a verifier that a given ciphertext is an encryption of signature on a given message. At a later stage on agreed or in case of dispute, the adjudicator can extract and give the signer's signature to the verifier. In existing verifiably encrypted signatures, the adjudicator is assumed to be a trusted third party who will not conspire with either of the two parties involved. Obviously, this assumption is naive. In this paper, we propose two new types of verifiably encrypted signature schemes. They can resolve the problem that the adjudicator may collaborate with the verifier. We also analyze the security of the proposed schemes.

Abstract: A novel multi-dimension and structure element edge-detection based on mathematical morphology is presented to resolve blur problem of classical morphology when detecting an edge to reduce the noise but hard to preserve the details and edge information of the original image effectively. First,pretreatment of the image are completed by close-open operation to eliminate noise; second,do close operation to smooth image,in the end,using the operation of morphological gradient for smooting image,the ideal image edge under the environment of existing noise is obtained,and it is applied to detect the edges of welding pore images. The experimental results show that it is compared with classical Sobel operators,Canny operators and traditional edge detection algorithm, the proposed algorithm has the following distinguished advantages:accuracy of edges detected, a clear outline of the image, and can preserve more image details as well, and insensitive to noise.

Abstract: There are three types of losses for magnetostrictors, elastic loss, magnetic loss and piezomagnetic coupling loss, similar to the loss mechanism of a piezoelectric (elastic, dielectric and piezoelectric losses) that our group has established recent years. By introducing these losses factors we can characterize magnetostrictive losses using complex parameters. Here we derived the relationship of mechanical quality factors and losses factor based on admittance spectra expression we have established previously. By measuring accurately the mechanical quality factors QA for the resonance and QB for the anti-resonance in the admittance/impedance curve, we can derive these three physical losses to characterize magnetostrictive hysteresis loss.

Abstract: A new algorithm for tracking a maneuvering target in presence of clutter or false measurements is addressed. Due to the availability of feature or attribute information in measurement vector, a joint probability density function description of the target state and target class is given. Using the joint state-class description the predictive measurement pdf can be proven to be a Gaussian mixture distribution. A Gaussian mixture Kalman filter is used for state estimation, where maneuver detection can also be avoided. In simulation the results with three tracking algorithms are compared, which have shown that proposed method here is more effective.