1994 Vol.7(1)
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1994, 8(1).
Abstract:
The penalty function method of continuum shape optimization and its sensitivity analysis technique are presented. A relatively simple integrated shape optimization system is developed and used to optimize the design of the inner frame shape of a three-axis test talbe. The result shows that the method converges well, and the system is stable and reliable.
The penalty function method of continuum shape optimization and its sensitivity analysis technique are presented. A relatively simple integrated shape optimization system is developed and used to optimize the design of the inner frame shape of a three-axis test talbe. The result shows that the method converges well, and the system is stable and reliable.
1994, 8(1).
Abstract:
This paper researches ultrasonic vibration drilling of carbon fiber reinforced polymers composites that are hard, brittle, and have low shear strength between layers. An experiment plan has been developed to reduce the axial force. Experimental studies have been done on the influence of porcess parameters, tool structures on the drilling axial force. The drilling mechanism is specially investigated. Thus an effective method is presented to reduce the drilling axial force. The authors suppose that ultrasonic vibration drillihng is feasible for carbon fiber reinforced polymers composites.
This paper researches ultrasonic vibration drilling of carbon fiber reinforced polymers composites that are hard, brittle, and have low shear strength between layers. An experiment plan has been developed to reduce the axial force. Experimental studies have been done on the influence of porcess parameters, tool structures on the drilling axial force. The drilling mechanism is specially investigated. Thus an effective method is presented to reduce the drilling axial force. The authors suppose that ultrasonic vibration drillihng is feasible for carbon fiber reinforced polymers composites.
1994, 8(1).
Abstract:
Influence of bearing misalignment on stability of a rotor-journal bearing system has been investigated through analysis and experiment on a test rig, mode component synthesis technique based on finite element method has been applied to model the system, sensitivity of stability behavious and bearing load to bearing characteristics and position have also been analyzed.
Influence of bearing misalignment on stability of a rotor-journal bearing system has been investigated through analysis and experiment on a test rig, mode component synthesis technique based on finite element method has been applied to model the system, sensitivity of stability behavious and bearing load to bearing characteristics and position have also been analyzed.
1994, 8(1).
Abstract:
New design of plain flow distributor of the radial piston low speed hydraulic motor is presented. On the basis of analyzing its static mathematic model and structural optimization, the kinetic characteristics of the distribution plates and the oil film between them are discussed in detail.
New design of plain flow distributor of the radial piston low speed hydraulic motor is presented. On the basis of analyzing its static mathematic model and structural optimization, the kinetic characteristics of the distribution plates and the oil film between them are discussed in detail.
1994, 8(1).
Abstract:
The aluminium sheet rolling is studied by using three dimensional elastic-plastic finite element method (FEM) based on considering both material and geometric non-linearity. Three dimensional distribution of the stress and deformation are given on the VAX11/780 computer. The spread deformation of the workpiece is analyzed by means of the moire method. The calcualtion results are compared with experimental results of the moire and agreement is well.
The aluminium sheet rolling is studied by using three dimensional elastic-plastic finite element method (FEM) based on considering both material and geometric non-linearity. Three dimensional distribution of the stress and deformation are given on the VAX11/780 computer. The spread deformation of the workpiece is analyzed by means of the moire method. The calcualtion results are compared with experimental results of the moire and agreement is well.
1994, 8(1).
Abstract:
This paper presents an automatic programming system on PC, it has also solved the technic problem in the combination of different curves or surfaces. The UNRBS is applied to modeling and fitting complicated curves and surfaces. The circular spline is combined with the NURBS to determine the cutter path in accordance with the features of the interpolation movement of NC machine tool. Three methods have been developed to solve the overcutting problems.
This paper presents an automatic programming system on PC, it has also solved the technic problem in the combination of different curves or surfaces. The UNRBS is applied to modeling and fitting complicated curves and surfaces. The circular spline is combined with the NURBS to determine the cutter path in accordance with the features of the interpolation movement of NC machine tool. Three methods have been developed to solve the overcutting problems.
1994, 8(1).
Abstract:
A nonlinear observer of friction torque is formulated for valve controlled servomotor system. The effect of the observer is studied with simulating method and its applied condition is analyzed. When the above observer is not suitable foe use, a simple PID controlling method with variable parameters is presented. The method has been proved to be effective by the experimental results.
A nonlinear observer of friction torque is formulated for valve controlled servomotor system. The effect of the observer is studied with simulating method and its applied condition is analyzed. When the above observer is not suitable foe use, a simple PID controlling method with variable parameters is presented. The method has been proved to be effective by the experimental results.
1994, 8(1).
Abstract:
In this paper, a new concept, I.e. Generalized Jacobian Matrix of MBS (abbreviation for multibody system) is presented which unifies three concepts of different realms; Partial (angular) velocity in MBS, first order effect coefficient in mechanism, Jacobian Matrix in robotics. This new concept not only enriches and developes kinematics of MBS and makes kinematics theory of MBS concise and being a formal way, but also becomes a new way to kinematic analysis of spatial mechanisms. It is also enlarged the paper that the usage of kinematics of MBS; the identical relationship between kinematics of MBS and error analysis of MBS is revealed.
In this paper, a new concept, I.e. Generalized Jacobian Matrix of MBS (abbreviation for multibody system) is presented which unifies three concepts of different realms; Partial (angular) velocity in MBS, first order effect coefficient in mechanism, Jacobian Matrix in robotics. This new concept not only enriches and developes kinematics of MBS and makes kinematics theory of MBS concise and being a formal way, but also becomes a new way to kinematic analysis of spatial mechanisms. It is also enlarged the paper that the usage of kinematics of MBS; the identical relationship between kinematics of MBS and error analysis of MBS is revealed.
1994, 8(1).
Abstract:
Dispatching optimally FMS tool system can utilize efficiently FMS automated tool provide system and raise flexibility of FMS. Some dispatch problems to be solved on FMS tool system are put forward. The models discussed of FMS tool system are given, and the mathematic describes are made on the models. The concept of operation tool change set is posed, and an optimal objective function is recommended. The algorithm of operation tool change set is studied and given. The developed successfully tool management system proves the algorithm is effective.
Dispatching optimally FMS tool system can utilize efficiently FMS automated tool provide system and raise flexibility of FMS. Some dispatch problems to be solved on FMS tool system are put forward. The models discussed of FMS tool system are given, and the mathematic describes are made on the models. The concept of operation tool change set is posed, and an optimal objective function is recommended. The algorithm of operation tool change set is studied and given. The developed successfully tool management system proves the algorithm is effective.
1994, 8(1).
Abstract:
The characteristics of the pressure pulsation resonance in HP fluid piping networks have been researched by means of computer simulation. It can be used as an auxiliary means to acuaint the effects of the structural parameters of complex fluid pipelines. It has provided the basis for reasonably configurating pipelines and avoiding the pressure pulsation resonance in fluid pipelines. It is of great applied value to engineering.
The characteristics of the pressure pulsation resonance in HP fluid piping networks have been researched by means of computer simulation. It can be used as an auxiliary means to acuaint the effects of the structural parameters of complex fluid pipelines. It has provided the basis for reasonably configurating pipelines and avoiding the pressure pulsation resonance in fluid pipelines. It is of great applied value to engineering.
1994, 8(1).
Abstract:
A mixed finite element solution of contact stresses in meshing gears is investigated with the consideration of coupled thermo-elastic deformation and impact behavior. A simulation procedure of finite element solution of meshing gears is developed. The versatility of the procedure for both numerical accuracy and computational efficiency is verified by numerical analysis of meshing gear teech.
A mixed finite element solution of contact stresses in meshing gears is investigated with the consideration of coupled thermo-elastic deformation and impact behavior. A simulation procedure of finite element solution of meshing gears is developed. The versatility of the procedure for both numerical accuracy and computational efficiency is verified by numerical analysis of meshing gear teech.
1994, 8(1).
Abstract:
A self-tuning adaptive controller is presented which is used for the adaptive control (AC) of drilling process. The parameters of the controller can be regulated in-processly by on line system identification, so as to fit the variation of the cutting conditions. This control method has been successfully applied to the adaptive control of drilling process. The experimental results indicate that the controller has the ability to adapt to the variation of the cutting process parameters and is good in performance.
A self-tuning adaptive controller is presented which is used for the adaptive control (AC) of drilling process. The parameters of the controller can be regulated in-processly by on line system identification, so as to fit the variation of the cutting conditions. This control method has been successfully applied to the adaptive control of drilling process. The experimental results indicate that the controller has the ability to adapt to the variation of the cutting process parameters and is good in performance.
1994, 8(1).
Abstract:
A new method for solving the velocity analysis of a mechanism is presented. Central to the method is how to convert the probem of velocity analysis of a mechanism to one of static analysis. Application of the method to certain practical problems has advantages compared to conventional methods for both graphical and analytical solutions. For brevity an example of a planar mechanism only is presented.
A new method for solving the velocity analysis of a mechanism is presented. Central to the method is how to convert the probem of velocity analysis of a mechanism to one of static analysis. Application of the method to certain practical problems has advantages compared to conventional methods for both graphical and analytical solutions. For brevity an example of a planar mechanism only is presented.
1994, 8(1).
Abstract:
The steel ball transmission of zero gear clearance is studied and its construction formation as well as transimission principle are also analyzed. The transmission ratioequations and dynamic balance conditions are given and no reverse-error techniique is deeply researched. It provides a kind of high property driver for the robots and other precision machines.
The steel ball transmission of zero gear clearance is studied and its construction formation as well as transimission principle are also analyzed. The transmission ratioequations and dynamic balance conditions are given and no reverse-error techniique is deeply researched. It provides a kind of high property driver for the robots and other precision machines.
1994, 8(1).
Abstract:
A new method of both analysis and graphics is presented for solving the problem of velocity analysis of a spatial four-bar mechanism. Central to the method is how to use the principle of virtual forces equilibrium system connected with the principle of virtual velocity to solve the velocity analysis of a mechanism. The mechod is accurate in principle and much simpler than the conventional method. It can be applied to both planar and spatial mechanisms. For brevity an example of a spatial mechanism only is presented.
A new method of both analysis and graphics is presented for solving the problem of velocity analysis of a spatial four-bar mechanism. Central to the method is how to use the principle of virtual forces equilibrium system connected with the principle of virtual velocity to solve the velocity analysis of a mechanism. The mechod is accurate in principle and much simpler than the conventional method. It can be applied to both planar and spatial mechanisms. For brevity an example of a spatial mechanism only is presented.