Design Of A Portable Instrument Used To Measure Comfort Of Trains

With the full-scale acceleration of main railways in our country, the comfort of trains will be paid attention to gradually by more and more peoples. Different countries have different standard about this problem, so there is no unification standard in the world. In order to formulate the benchmark of the comfort, many countries and organizations have experimentalized on lots of ways. Some of them were about the comfort on curves; some of them compute the value every five minutes, neither beeline nor curve; in others, a switch will be pressed when people feel uncomfortable to get the statistic value. Although there are different standards and words in evaluating, they have a great contribution to the controlling bound on the comfort. Moreover, the measurement of the vibration about the carriages is always did on the floor board, but there is an important problem is that different parts of a person ,such as the head, the back, the stern, have different feeling toward the vibration, so what is most important is finding the relation among them. The instrument about comfort in this passage is based on the ISO2631 and UIC513.The technique about digital signals process has been becoming a key subject gradually based on the deeper research of IT and the fast developing of the computer technique. DSP is a MPU with special structure, just for the fast arithmetic about digital signals process, the largest speed of which can reach 2000 MIPS, which is as 10-50 times fast as the best CPU. Nowadays, with the fast development of micro-electronics, the development about DSP changes with each passing day, and the function of DSP has swelled day and day, but the price is becoming lower and lower, what is more, the ways of exploitation have been improved all the times.According to the requirement of the instrument, this passage, based on the theory about digital signals process, designs the instrument used to measure comfort of trains, TMS320VC33 is the CPU in which. The instrument can analyze and compute of the comfort by detecting the acceleration of the vibration on real times which can provide the valid gist for improving the comfort and ensure the quality of its traveling. This passage offers the research of this instrument based on both hardware and software, and introduces the designing course, the composing of the hardware and the software program.