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    by over 50 percent depending on the motor's transient response. In many cases fault
    stopping of the motor yields the highest system stresses.
         Our computer model is capable of treating stations connected to group by spring,
    damper or both. Field measurements indicated that sufficient solution accuracy in
    large inertia rolling mill systems can be obtained by neglecting these parameters.
        We used a simplified model of the roll bite area because we felt that excessive
    massaging of the inputs to effect improved agreement with test results by a few
    percentage points was not economically justifiable; in order for the model to
    withstand the test of time a fundamental approach to modeling the hot mill drive
    system should demonstrate reasonable agreement with test results.
     The design theory of a statically determinate rolling mill, including the redesign of
    the statically indeterminate characteristic and hyperstatic characteristic, is proposed in
    this paper. The statically indeterminate characteristic  leading to the  nonparallel
    running state of rolls is revealed based on analysis of three rolling mills, including a
    2200 mm aluminum foil four-high mill, a 1580 mm PC four-high mill, and a 650 mm
    bar two-high rolling mill, etc. The hyperstatic  characteristic leading to uneven load
    performance of four-row roller bearing is caused by redundant constraints in the roll
    system based on analysis of 17 two- and four-high rolling mills. In contemporary
    four- or six-high plate rolling mills, regular dynamic cross between the rolls is very
    common during the whole rolling process. Dynamic cross results in excessive axial
    forces causing frequent burning losses of the end-thrust bearings and leads to serious
    deviations in the rolling load on both ends of the backup roll. Hence, rolling mills
    designed for heavy loads and high speeds have yet to operate at their design load  
    and speed in a safe and stable way. According to the analysis of the degrees of
    freedom of a spatial mechanism, the cause of dynamic cross lies in the statically
    indeterminate characteristic of the roll system caused by the small clearance in the
    system. In this paper, the theoretical  analysis and experi- ments invalidate the
    accepted method of the offsetting of the mill.  Furthermore, it is shown that
    offsetting  causes an asymmetrical  cross between the rolls. Therefore, it is pro-
    posed that offsetting should be eliminated, and additional jack devices should be
    intro- duced to maintain the rolls parallel. In addition, bending deflections of the roll
    induce hyperstatic characteristics of the roll system due to the existence of redundant
    constraints in the system. The hyperstatic characteristic of the roll system results in
    uneven load per- formance of the radial roller bearings and shortens bearing life. In
    the newly proposed statically determinate four- or six-high plate rolling mill, which
    can be operated in a safe and stable way under heavy load and high speed working
    conditions, this problem can also be solved.   
       Rolling mills have a long history of over 500 years and have resumed a rapid
    development in the past 30 years. Many    multifunctional plate rolling mills designed
    for heavy loads, high speed, and accuracy have successively appeared, including the
    2050mm continuously variable crown (CVC) four-high mill, 2200mm aluminum foil
    four-high mill, 1580mm pair cross (PC) four-high mill, 3500mm mediate and heavy
    plate four-high mill, and the 600mm universal crown control (UC) six-high mill [1].
    However, in these rolling mills, numerous shortcomings exist, including regular
    dynamic cross with a very small angle between the rolls, excessive axial forces
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