Patent ID: 11920472
Assignee: CHINA RAILWAY ELEVENTH BUREAU GROUP CO., LTD
Field: Other special machines (Mechanical engineering)
Classification: CPC E  F | IPC E

Claim 5:
6. The millisecond time control method for excavation blasting of a tunnel as claimed in claim 5, wherein the step 3 comprises:
fitting the single-hole blasting vibration waveforms to obtain a single-hole waveform fitting function, wherein a formula of the single-hole waveform fitting function is as follows:, f
   ⁡
   (
   t
   )
  
  =
  
   
    a
    0
   
   +
   
    
     
      ∑
       
     
     
      i
      =
      0
     
     k
    
    ⁢
    
     (
     
      
       
        
         a
         i
        
        ⁢
        cos
        ⁢
        i
        ⁢
        ω
        ⁢
        t
       
       +
       
        
         b
         i
        
        ⁢
        sin
        ⁢
        i
        ⁢
        ω
        ⁢
        t
       
      
      ;
     
    
   
  
 

extending the single-hole waveform fitting function based on a single-hole waveform truncation time to obtain a time domain waveform fitting function, wherein a formula of the time domain waveform fitting function is as follows:, v
   ⁡
   (
   t
   )
  
  =
  
   {
   
    
     
      
       0
      
      
       
         
        
         t
         <
         0
        
       
      
     
     
      
       
        
         f
         ⁡
         (
         t
         )
        
         
       
      
      
       
        0
        ≤
        t
        ≤
        T
       
      
     
     
      
       
        0
         
       
      
      
       
        T
        <
        t
       
      
     
    
    ;
   
  
 

wherein f(t) represents the single hole waveform fitting function, t represents time, a0, ai, and bi represent fitting coefficients, ω represents a fundamental frequency, k represents a fitting series, a curve fitting calculation is controlled by the fitting series k, a value of k is adjusted according to a waveform fitting accuracy, v(t) represents the time domain waveform fitting function, and T represents the single-hole waveform truncation time; and
performing a linear superposition calculation on the groups of the four dimensions of blasting parameters to obtain the vibration synthesis curve.