A New Method of Torque Compensation for High Speed Indexing Cam Mechanism

1999 ◽  
Vol 121 (2) ◽  
pp. 319-323 ◽  
Author(s):  
Teng Guilan ◽  
Fu Haibo ◽  
Zhou Weiyi
Keyword(s):  
Kinetic Energy ◽  
High Speed ◽  
Output Shaft ◽  
New Method ◽  
Linkage Mechanism ◽  
Energy Fluctuation ◽  
Positioning Accuracy ◽  
Input Shaft ◽  
Cam Mechanism

Severe vibration and poor positioning accuracy may occur in an indexing cam mechanism operating at a high speed. Torque fluctuation of the input shaft and the resulting fluctuation of kinetic energy of the mechanism may be the major cause of the vibration. In this paper a method is proposed to minimize the fluctuation by using a so-called “speed-varying flywheel” that produces an opposite kinetic energy fluctuation that can counteract the effect of the energy fluctuation. The flywheel is installed on the output shaft of an additional cam-linkage mechanism. The parameter of the cam-linkage mechanism is optimized. An example is given to demonstrate the effectiveness of this method.

A New Method for Determining the Effects of Structural Flexibility on the Dynamic Behavior of High Speed Mechanisms

1999 ◽  
Author(s):  
L. Yuan ◽  
J. Rastegar
Keyword(s):  
Dynamic Behavior ◽  
High Speed ◽  
New Method ◽  
Structural Flexibility ◽  
Structural Elements ◽  
Dynamics Modeling ◽  
Linkage Mechanism ◽  
Active Materials ◽  
Response Characteristics ◽  
Four Bar Linkage

Abstract A new method for the analysis of the effects of structural flexibility on the dynamic behavior of mechanical systems is presented. The developed method is in most part based on “tracing” the “propagation” of the effects of the high frequency motion requirements on the dynamic response characteristics of machines with structural flexibilities, particularly those with closed-loop kinematic structures. The method considers the “filtering” action of structural elements with flexibility. Such filtering of higher frequency motions is shown to have a predictable effect on the steady state motion of such mechanical system. The main advantage of the developed method is that the effects of such flexibilities can be determined without the need to perform the usual dynamics modeling and computer simulations. The method is shown to be very simple and readily implementable. The method is applied to a four-bar linkage mechanism with a longitudinally flexible coupler link. The obtained results are shown to be highly accurate as compared to those obtained by computer simulation. The application of the method to systematic design of machines with structural flexibility for high speed and precision operation, optimal integration of smart (active) materials into the structure of such machines, and some related issues are discussed.

A New One-Side Finish Machining Method for Profile of Globoidal Indexing Cam in High Speed

2009 ◽  
Vol 626-627 ◽  
pp. 611-616
Author(s):  
X.F. Tang ◽  
Wei He ◽  
Y.S. Liu
Keyword(s):  
High Speed ◽  
Tool Path ◽  
New Method ◽  
Practical Calculation ◽  
Machined Surface ◽  
Finish Machining ◽  
Cam Mechanism ◽  
Cad Cam ◽  
Meshing Characteristics ◽  
Path Modification

A new one-side finish machining method for the profile of globoidal indexing cam in high speed, which modifies the tool path of traditional enveloping method, was put forward. The new method is useful for overcoming the defects caused by traditional enveloping method, can realize one-side machining of globoidal indexing cam, can improve the machined surface quality and the meshing characteristics of the cam mechanism. The practical calculation formulas of tool path modification is given, which can be used in developing the CAD/CAM software of the globoidal indexing cam. The new method has great practical value.

Kinematics Analysis of the Wedge Clamping Device of PET Bottle Blowing Machines

2011 ◽  
Vol 199-200 ◽  
pp. 341-347
Author(s):  
Teng An Zou ◽  
Cun Yun Pan ◽  
Xiao Jun Xu ◽  
Xiang Zhang
Keyword(s):  
High Speed ◽  
Maintenance Cost ◽  
Kinematics Analysis ◽  
Linkage Mechanism ◽  
Job Requirements ◽  
Cam Mechanism ◽  
Kinematics Modeling ◽  
Compensation Device ◽  
Pressure Compensation ◽  
Clamping Device

In the current pin clamping device of bottle blowing machines, the design datum can’t coincide with mold datum. So it not only needs a pressure compensation device, but requires clamping holes to meet high precision. It makes the clamping device manufacturing and maintenance cost high. On the other hand, the producing plastic bottles have obvious mold lines. It affects products quality. For the above shortcomings, this paper designs a wedge clamping device, and then analyzes the kinematics modeling of planar moving cam mechanism and plane linkage mechanism. The results show that the device has smooth operation and small impact. So the new wedge device can meet the job requirements of high-speed rotary bottle blowing machines.

Vibration Influence of Artillery Autoloader Analysis and Testing

2013 ◽  
Vol 711 ◽  
pp. 540-544
Author(s):  
Jie Xing ◽  
Yin Xian Duo
Keyword(s):  
Kinetic Energy ◽  
Stationary State ◽  
High Speed ◽  
High Speed Photography ◽  
Working Mechanism ◽  
Positioning Accuracy ◽  
Muzzle Velocity ◽  
Exciting Source ◽  
Feeding Process ◽  
The Impact

The inconsistency of the projectile's seizing-bore stroke of the large caliber gun during feeding process will lead to differences of the volume of propellant chamber and starting pressure of projectiles.It will also affect guns' muzzle velocity and firing accuracy.In order to improve the positioning accuracy of projectiles in an arm-type autoloader,first of all,high speed photography was used and only to find that there will be vibrations of projectiles in the direction of gravity.The vibrations will consume kinetic energy of the projectile and contribute to inconsistency of the retaining force.By means of analyzing the working mechanism of the rammer,the motion relationship among the parts during ramming process came to clear eventually.Then the position of the exciting source which causes vibrations of the projectile can be determined by analyzing the force situation of the rammer in the stationary state and the state of motion,and next,testing the amplitude and frequency of the position using laser displacement sensor.Finally,the improved scheme was raised to eliminate the impact of the vibration on stability of ramming.

A new method used for high speed pseudo-random code generating

2014 ◽  
Author(s):  
Zhanfeng Zhao ◽  
Dong Zhang ◽  
Zhiquan Zhou
Keyword(s):  
High Speed ◽  
New Method ◽  
Random Code

scholarly journals A New Method to Verify the Measurement Speed and Accuracy of Frequency Modulated Interferometers

2021 ◽  
Vol 11 (13) ◽  
pp. 5787
Author(s):  
Toan-Thang Vu ◽  
Thanh-Tung Vu ◽  
Van-Doanh Tran ◽  
Thanh-Dong Nguyen ◽  
Ngoc-Tam Bui
Keyword(s):  
Phase Change ◽  
High Speed ◽  
Measurement Accuracy ◽  
Slow Motion ◽  
New Method ◽  
Virtual Displacement ◽  
Electro Optic ◽  
Lock In ◽  
Speed And Accuracy ◽  
Electro Optic Modulator

The measurement speed and measurement accuracy of a displacement measuring interferometer are key parameters. To verify these parameters, a fast and high-accuracy motion is required. However, the displacement induced by a mechanical actuator generates disadvantageous features, such as slow motion, hysteresis, distortion, and vibration. This paper proposes a new method for a nonmechanical high-speed motion using an electro-optic modulator (EOM). The method is based on the principle that all displacement measuring interferometers measure the phase change to calculate the displacement. This means that the EOM can be used to accurately generate phase change rather than a mechanical actuator. The proposed method is then validated by placing the EOM into an arm of a frequency modulation interferometer. By using two lock-in amplifiers, the phase change in an EOM and, hence, the corresponding virtual displacement could be measured by the interferometer. The measurement showed that the system could achieve a displacement at 20 kHz, a speed of 6.08 mm/s, and a displacement noise level < 100 pm//√Hz above 2 kHz. The proposed virtual displacement can be applied to determine both the measurement speed and accuracy of displacement measuring interferometers, such as homodyne interferometers, heterodyne interferometers, and frequency modulated interferometers.

scholarly journals Study on High-Speed Intermittent Motion Mechanism. Comparison Indexing Cam Mechanism with Servo-System.

2002 ◽  
Vol 68 (668) ◽  
pp. 1191-1197
Author(s):  
Masatoshi HIKIZU ◽  
Hiroaki SEKI ◽  
Yoshitsugu KAMIYA ◽  
Hiroshi TACHIYA ◽  
Hisanao NOMURA
Keyword(s):  
High Speed ◽  
Servo System ◽  
Motion Mechanism ◽  
Cam Mechanism ◽  
Intermittent Motion

Research and Application on a Multi Head Conjugate Disc Indexing Cam Mechanism

2012 ◽  
Vol 184-185 ◽  
pp. 384-388
Author(s):  
Bing Tian Gao
Keyword(s):  
High Speed ◽  
Production Efficiency ◽  
High Reliability ◽  
Low Cost ◽  
Domestic Industry ◽  
Cam Mechanism ◽  
Technical Performance ◽  
Working Performance ◽  
Research Achievement ◽  
Indexing Mechanism

In order to realize the technical performance of high speed, high precision, high stability and high reliability for conjugated indexing mechanism with periodic intermittent rotary motion, a two cams structure has been designed, and its geometry size and profile curve was carefully determined. Also the calculation formula of the contour curve for CAM was deduced. Research achievement has been applied to new equipment of enterprise development, the working performance is stable and reliable, the production efficiency raised by 30% compared to the domestic industry. The mechanism has characteristics of simplified structure, improved transmission performance and low cost.

Effective Stripper-Holding on High Speed Precision Blanking of Electronic Machine Parts

2005 ◽  
Vol 6-8 ◽  
pp. 805-808
Author(s):  
F. Sekine
Keyword(s):  
Mechanical Model ◽  
High Speed ◽  
Thin Sheet ◽  
Dimensional Accuracy ◽  
New Method ◽  
Important Process ◽  
Sheet Metals ◽  
Progressive Dies ◽  
Machine Parts

The blanking of thin sheet metals using progressive dies is an important process on production of precision electronic machine parts. As a model of IC leadframe, an I-shaped and an Lshaped models were blanked and influences of blanking conditions on dimensional accuracy of blanked lead were examined. Furthermore, a mechanical model is proposed to explain the affect of the blanking conditions on product accuracy. In these days, more fine leads are required as electronic machines become more precise and accurate. It must be treated that leads are firmly held for blanking leadframes accurately. In this paper, an effective method of stripper holding leads strongly are discussed and a new method using newly designed stripper is proposed. Consequently the effect of it on lead accuracy is proved.

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