In order to control the rigidity of the finished scroll better,the factors on that effect on the pressure invariableness between scroll and supporting rollers such as diameter, paper's fixed quantity, scroll's radial density were emphasised.

Under exponential distribution, the authors give point estimation and fiducial lower limit of average life testing based on the data from constant stress life testing and by applying two methods.

For some spaceflight electronic products,the accelerated life test technology is based on the features of the products along with their age distribution A scheme of the constant stress accelerated life testing taking the temperature as a stress is proposed.

In order to obtain the life information of the vacuum fluorescent display(VFD)in a short time,a model of constant stress accelerated life tests(CSALT)is established with its filament temperature increased,and four constant stress tests are conducted.

To solve this problem,setting up the constant tension of dual speed digital control system,through the main encoder position measurement,as well as analysis of tensionsensing data processing and control algorithm,controlling test data decision-making accurately.