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This article presents a distributed dissimilar redundancy architecture of fly-by-wire Flight Control System. It is based on many dissimilar flight control computer, redundancy structure which includes the cross arranged hydraulic and power supply, three types of data buses, lots of data correction monitors, a distributed control loop to avoid the correlated faults and achieve the rigid safety airworthiness...
This paper discusses the problem of scheduling a set of jobs on parallel machines considering sequence-dependent setup times. The processing sequence of jobs assigned to each machine is determined to minimize the makespan. Since it is a NP-hard problem, even for instances with small sizes, the computational effort may be prohibitively large. Then genetic algorithms with two types of assignment scheme...
Cam is a typical contour on non-circular grinding. The data of cam profiles could be illustrated based on taking the lift of a flat follower or roller as a function of cam rotation angle and converting it into the polar coordinates of the cam profile. According to working principle of camshaft grinding machine, the coordinates of cam profile and grinder can be calculated. This paper analyzes the conventional...
Raw material yards at dry bulk terminals act as temporary buffers for inbound and outbound raw materials. Both discharging and charging processes are supported by raw material yards in most cases. Stacker-reclaimers are dedicated equipments in yards for raw material handling. The efficiency of yard operation depends to a great extent on the productivity of stacker-reclaimers. Stacker-reclaimer scheduling...
Surface reconstruction and products processing are both key technologies in reverse engineering. This paper presents a simplified method for B-spline curve back calculation which regards data points as control points. This method not only greatly simplifies the process of B-spline surface reconstruction but also provides a favorable condition for real-time interpolation in NC machining. Then an error...
In modern CNC machining, the interpolation of complex profile curve with high speed and high accuracy is required. Based on B spline curve theory, a revised algorithm of cubic B spline curve interpolation is presented in the paper. This proposed algorithm gives a new method which is based on pre-judgment of machining feedrate to calculate the tangent vectors of spline curve junction. The tangential...
Due to the boom in world trade with leaps and bounds, port authorities are looking into ways of making facilities more efficient. To build Shanghai as the international shipping center, it is the strategic step to found Shanghai as the international container hub port. The Shanghai port must improve the competitive ability to cope with this dynamic challenge. However the existing piling capability...
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