04B-CAD工程手册的数据处理技术讲述.ppt

工程手册的数据处理技术;数表的计算机处理;例1 某型号V带包角修正系数的程序化处理;例2 检索齿轮传动工况系数;#include stdio.h void main() { int i,j; float ka[3][3]={{1.0,1.25,1.75}, {1.25,1.50,2.00}, {1.50,1.75,2.25} }; while(1) { printf(”Input the load characteristics of engine(0,1,2)”) scanf(”%d”,i); if (i=0i=2)break; } while(1) { printf(”Input the load characteristics of machine(0,1,2)”) scanf(”%d”,j); if (j=0j=2)break; } printf(”the work state coeffiecient:%f”,ka[i][j]); };1.2 数表的文件化;#include stdio.h #define NUM 100 struct key_GB {float d1,d2,b,h,t,t1 } key; void main() { int i; FILE *fp; if(fp=fopen(”key.dat”,”w”))==NULL) { printf(”Can’t open the data file”); exit(0); } for(i=0;iNUM;i++) { printf(”Record %d:d1,d2,b.h,t,t1”,i) scanf(”%f, %f, %f, %f, %f, %f,”,key.d1, key.d2, key.b, key.h, key.t, key.t1,); fwrite(key,sizeof(struct key_GB),1,fp); } fclose(fp); };#include stdio.h #define NUM 100 struct key_GB {float d1,d2,b,h,t,t1 } key; void main() { int I,j; FILE *fp; While(1) { printf(”Input the shaft diameter d=”); scanf(”%f”,d); if(d8d=85)break; else printf(”The diameter is not in range, input again!”); } if(fp=fopen(”key.dat”,”w”))==NULL) { printf(”Can’t open the data file”); exit(0); };for (i=0;iNUM;i++) { fseek(fp,i*sizeof(struct key_GB),SEEK_SET); fread(key,sizeof(struct key_GB),1,fp); if(dkey.d1d=key.d2) {printf(”The key:b=%f,h= %f, t=%f, t1=%f”,key.b, key.h, key.t, key.t1); break; } fclose(fp); };2 线图的计算机处理;2.1 一般线图的处理;;;2.2 复杂线图的处理;由于各型号边界为直线,则直线方程:;#include math.h void belt(int n,float p,int *k) { float c; c=log10(490.0)+(log10(p)-log10(0.8))*(log10(4900.0)-log10(49.0))/ (log10(3.8)-log10(0.8)); if(n=4900.0||n=pow(10,c) *k=0; else c=log10(100.0)+(log10(p)-log10(1.0))*(log10(3400.0)-log10(100.0))/ (log10(10.5)-log10(1.0)); if(n=3400.0||n=pow(10,c) *k=1; else ……. };函数插值 在插值点附近选取合适的连续结点，构造一个简单的函数，代替原