Patent ID: 11860590
Assignee: ZHEJIANG UNIVERSITY
Field: Other special machines (Mechanical engineering)
Classification: CPC G  B | IPC B  G

Claim 3:
4. The model-free optimization method of process parameters of injection molding according to claim 1, characterized in that: in step (4), a method of calculating the gradient value is as follows:, ∇
    
      J
      ⁡
      
        (
        
          X
          0
        
        )
      
    
  
  =
  
    
      [
      
        
          
            
              
                ∂
                J
              
              
                ∂
                
                  x
                  1
                
              
            
          
        
        
          
            ⋮
          
        
        
          
            
              
                ∂
                J
              
              
                ∂
                
                  x
                  n
                
              
            
          
        
      
      ]
    
    =
    
      
        
          [
          
            
              
                
                  
                    x
                    1
                    1
                  
                  -
                  
                    x
                    1
                    0
                  
                
              
              
                …
              
              
                
                  
                    x
                    n
                    1
                  
                  -
                  
                    x
                    n
                    0
                  
                
              
            
            
              
                ⋮
              
              
                ⋱
              
              
                
                  
                
              
            
            
              
                
                  
                    x
                    1
                    n
                  
                  -
                  
                    x
                    1
                    0
                  
                
              
              
                
                  
                
              
              
                
                  
                    x
                    n
                    n
                  
                  -
                  
                    x
                    n
                    0
                  
                
              
            
          
          ]
        
        
          -
          1
        
      
      ·
      
        [
        
          
            
              
                
                  J
                  ⁡
                  
                    (
                    
                      X
                      1
                    
                    )
                  
                
                -
                
                  J
                  ⁡
                  
                    (
                    
                      X
                      0
                    
                    )
                  
                
              
            
          
          
            
              ⋮
            
          
          
            
              
                
                  J
                  ⁡
                  
                    (
                    
                      X
                      n
                    
                    )
                  
                
                -
                
                  J
                  ⁡
                  
                    (
                    
                      X
                      0
                    
                    )
                  
                
              
            
          
        
        ]
      
    
  

wherein: Xi=[x1i,x2i, . . . , xni]T=[x10,x20, . . . , xi0+δi, . . . xn0]T, is a parameter sample obtained after disturbing the current parameter sample directed to the ith parameter, wherein δi is disturbing quantity; J(Xi) is a difference between a quality index value Q(Xi) and a quality index target value Qtarget corresponding to Xi; and i=0, 1, 2, 3, . . . , n.