关于压电交变电压加载

916754385

代码：
....
/solu
antype,static
trnopt,full

dt=0.1
pi=acos(-1)

asel,s,loc,y,2
nsla,s,1

*get,n2,node,0,num,min

*do,i,1,40
    d,n2,volt,3000*sin(2*pi*dit*i)
   time,dt*i
    nsubst,1,,,1
    kbc,0
    outres,all,all
    solve
*enddo

time,dt*40+2
nsubst,20,,,1
kbc,0
solve
......
每次执行到*enddo后都会提示 “a check of  your load data  produced 175 warnings, SHOULD THE  SOLV COMMAND BE  EXECUTED?”  这是怎么回事啊