Together this Project has accumulated 14.6 years of on-orbit experience without a spacecraft bus failure.
Although we developed the wire antenna system as part of Plasma Wave Analyzer (Ono et al. 1998; Matsumoto et al. 1998) for the Nozomi (Planet-B) Mars orbiter launched in 1998, we had no chance to try the deployment operation till its mission end (December 2004), because of the multiple bus system failures that occurred in December 1998 and April 2002.
Open image in new window Fig. 15 Bus segment2 failure while b8 sampling value miss.
As all microprocessor-based systems use a CPU surrounded by dozens of chips all hanging on a common bus, the failure of any of which can cause problems, it makes sense to bring up the embedded system by testing the simplest sections of the hardware first.
Every reduction in bus service, or failure to increase it, because of a lack of passengers causes good union jobs to be lost.
Despite their success in London, buses suffer an image problem, as anyone will testify who remembers the line, attributed to Margaret Thatcher, that any man over the age of 30 who had to take a bus was a failure.
At the crash scene, investigators gave no indication of the cause, but noted that they were examining the bus for possible mechanical failures and the highway and field for clues.
The substation P&C integrates functions of line, bus, transformer protections, switch failure; autoreclosure, automatic bus transfer, UFLS, UVLS, overload inter-tripping and substation control function, etc.
The most common cause of failure in bus structures is fatigue, and it is generally located at strain concentration zones that appear in the welded junctions of these structures.
The challenge in practice is to consider phased-mission systems together with common bus structures and common cause failures.
