Điều này dẫn đến sự đột biến vô hạn của tăng tốc hiển thị ở những điểm. Những đột biến này là đúng hơn được gọi là hàm delta Dirac. Tăng tốc vô hạn có thể không thực sự thu được, vì nó đòi hỏi lực lượng vô hạn. Rõ ràng là năng động ENGINE Chương trình, với các văn bản này, sẽ tính toán các phương trình thu được trong chương này và cho phép sinh viên thực hiện nhiều biến thể của một thiết kế động cơ trong một thời gian ngắn. . | DYNAMIC FORCE ANALYSIS Equations and the four force equations from equations and excluding the external force Fp give US nine equations in the nine unknowns which we can put in matrix form for solution. 1 0 1 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 -H12 y 12x - R32y 32x 0 0 0 0 1 0 0 -1 0 1 0 0 0 0 0 0 0 -1 0 1 0 0 0 0 0 R23y - 23 - 43 R43x R34x 1 14 14x 0 0 0 0 0 -1 0 1 0 0 0 0 0 0 0 -1 0 1 0 0 0 0 0 ux uy 0 0 0 Fnx - m2aG2x J y 32x F32y F43x m2aG2y JG2a2 m3aGĩx m3aGĩy F Lri2 J fơ3 G4 a4 m4aG4x m4aG4y 0 FORCE ANALYSIS LINKAGES WITH MORE THAN FOUR BARS This matrix method of force analysis can easily be extended to more complex assemblages of links. The equations for each link are of the same form. We can create a more general notation for equations to apply them to any assembly of n pin-connected links. Let j represent any link in the assembly. Let i j - 1 be the previous link in the chain and k j 1 be the next link in the chain then using the vector form of equations Fy Fjk Fextj - mj aG Ry X ự R Fjk j X exrJ- j where 7 2 3 . z j 1 k j 1 j n if 7 n k 1 and F. F . Fji Fij Fkj - Fjk The sum of forces vector equation can be broken into its two X and y component equations and then applied along with the sum of torques equation to each of the links in the chain to create the set of simultaneous equations for solution. Any link DESIGN OF MACHINERY CHAPTER 11 may have external forces and or external torques applied to it. All will have pin forces. Since the nth link in a closed chain connects to the first link the value of k for the nth link is set to 1. In order to reduce the number of variables to a tractable quantity substitute the negative reaction forces from equation where necessary as was done in the examples above. When sliding joints are present it will be necessary to add constraints on the allowable directions of forces at those joints as was done in the inverted
