Research on the Optimization Method of the Friction Plate Backlash

2013 ◽  
Vol 572 ◽  
pp. 476-479
Author(s):  
Sheng Long Li ◽  
Liang Gao ◽  
He Zhang
Keyword(s):  
Impact Force ◽  
Impact Damage ◽  
Mathematic Model ◽  
Optimization Method ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Friction Plate ◽  
Planetary Transmission ◽  
Relationship Of ◽  
The Impact

Friction plate, the key part of the planetary transmission, is often damaged by the impact of the geer mesh. And the reason of the impact damage is not known yet. The backlash of the friction plate is crucial to the impact damage, thus the relationship of the backlash and impact damage is dissgussed in this study.The mathematic model is built up to calculate the impact force and the ADAMS dynamics simulation software is used to check the result of the mathematic model and get the dynamic characteristics of the impact force and provide the basis for the optimizing of backlash. Keywords: friction plate;impact of geer mesh;geer backlash;mathematic model

Impact Dynamics of Multi-Link Robots with Link and Joint Flexibility

2012 ◽  
Vol 226-228 ◽  
pp. 685-692 ◽  
Author(s):  
Zhen Jie Qian ◽  
Ding Guo Zhang
Keyword(s):  
Impact Force ◽  
Mathematic Model ◽  
Dynamics Simulation ◽  
Impact Dynamics ◽  
Flexible Link ◽  
Transformation Matrices ◽  
Rotary Joint ◽  
Manipulator Arm ◽  
Stretching Deformation ◽  
The Impact

The dynamic analysis of a flexible-link-joint robot colliding with its environments is presented in this paper. Kinematics of both rotary-joint motion and link deformation is described by 4×4 homogenous transformation matrices. Both the stretching deformation, bending deformation and the torsional deformation of the flexible links are considered. Furthermore, the flexibility and the mass of the joint are considered too. The concept of impact force potential energy is introduced, so that the generalized forces due to the impact force can be computed easily. The Lagrange dynamic equations are used to establish the complete mathematic model of the system with impact. Dynamics simulation of a spatial flexible-link-joint manipulator arm is given as an example to validate the algorithm presented in this paper. And the numerical results indicate that the flexibility of the link and joint have distinguished influence on the impact dynamics of the flexible robots.

Design and simulation analysis of impact-resistant flexible drill pipe for rock-breaking rig

2021 ◽  
pp. 095745652110307
Author(s):  
Kangping Gao ◽  
Xinxin Xu ◽  
Ning Shi ◽  
Shengjie Jiao
Keyword(s):  
Impact Force ◽  
Drill Pipe ◽  
Rock Breaking ◽  
Control Model ◽  
Simulation Software ◽  
System Stability ◽  
Series Elastic Actuator ◽  
Pipe Model ◽  
The Impact ◽  
Series Elastic

In the process of drilling and coring by the rock-breaking rig, the drill rod is affected by the intermittent impact force, which reduces the efficiency of the rig to break the rock and increases the cost of the drilling and coring. Therefore, it is very important to improve the impact resistance of the drill pipe during the rock-breaking process. To achieve this goal, a flexible design of the drill pipe was carried out, and a dynamical model of the drilling rig based on a series elastic actuator was established. Considering the dynamic performance of the system, a torque feedforward link is introduced and a control model based on the force source is established. The influence of the equivalent inertia of the transmission system and the series elastic actuator damping coefficient on the system stability was analyzed by drawing the frequency domain characteristic curve of the system. By using the control and Simulink simulation software, the electromechanical simulation of the model is carried out, and the torque step tracking response of the system is obtained. A torque feedforward link is introduced to establish the control model of the system based on force source. Through dynamic simulation software ADAMS, dynamic and static impact simulation experiments were carried out on the system. The results show that when a force of 200 N is applied to the output end of the drill pipe in the tangential direction, the maximum moments received by the joint under static and dynamic environments are 34.1 N·m and 57.9 N·m, respectively. When the impact force disappears, the time required for the flexible drill pipe to reach a stable state is only 0.15 s, which verifies that the series elastic actuator–based drill pipe model can alleviate the impact of the external environment and protect the internal structure of the rig.

A Unique Engineering Approach in Horizontal Drilling Through Unconsolidated Formations to Minimize Time and Cost Using High-Build-Rate Rotary Steerable Systems in Sultanate of Oman

2021 ◽  
Author(s):  
Ahmed Omara ◽  
Hector Alba ◽  
Faisal Al Yarroby ◽  
Ahmed Al Abri ◽  
Riyad Al Habsi
Keyword(s):  
Extensive Study ◽  
Simulation Software ◽  
Integrated System ◽  
Dynamics Simulation ◽  
Directional Drilling ◽  
Drilling Rate ◽  
Horizontal Drilling ◽  
Hole Cleaning ◽  
The Impact ◽  
Drilling Time

Abstract Drilling horizontal wells with a high dogleg severity (DLS) of 10–16 deg/30 m is the approach that one operator in Oman adopted to drill the buildup section. The 8½-in section used to be drilled with a conventional motor BHA, which took around 4 days to complete. Due to the high DLS, it was required to slide at least 80% of the time. This led to a slow drilling rate, hole cleaning issues, and difficulties running the 7-in liner afterward. For a step change to happen, a full directional drilling system had to be reengineered with an extensive study of the BHA and well design. The objective was to reduce the total drilling time in the 8½-in BUS, improve the borehole quality, and reduce flat time. Traditional rotary steerable systems (RSS) are limited with their steering capabilities. A hybrid, high-build-rate RSS with push- and point-the-bit features offers the capabilities of achieving a DLS of up to 17 deg/30 m as it is independent of outside formation. Implementing the new approach eliminated the long sliding intervals and poor borehole cleaning caused by limited surface rotation with the motor BHA. The system was modeled using finite element drilling dynamics simulation software, with multiple bits and drillstring configurations to optimize the directional results. In addition, compressive study of the mud properties enabled drilling the section safely throughout Nahr Umar shale. Later, the same system was coupled with a high-torque motor, and the results showed an even better performance, which the operator plans to consider in the future to enhance the drilling rate. The use of a hybrid RSS system with a specific bit built for the application has proven its success as an integrated engineered drilling solution. It reduced the 8½-in section drilling time by 50% with improved borehole quality and delivered an overall ROP that is approximately three times what a motor BHA would have delivered. The improvement is a result of the use of PDC over TCI bits and the elimination of slide drilling. In addition, full rotation and elimination of micro-DLS resulted in smoother liner running operation. While drilling, the 100% rotational steering improved the overall hole cleaning, and the modified mud properties and additives helped eliminate the wiper trips performed previously prior to reaching the reservoir section. The success of this integrated system led the operator to replace all the motors in the entire field. This paper emphasizes the impact of new technology together with effective well engineering in drilling efficiency. With current industry focus on cost control, high-DLS RSS technology introduces new savings when used in the right application. This particular case is very common across the industry and proves the many advantages of integrated engineering projects.

Foreign Object Damage Behavior of a SiC Fibrous Ceramic Composite

2017 ◽  
Author(s):  
Nesredin Kedir ◽  
D. Calvin Faucett ◽  
Luis Sanchez ◽  
Sung R. Choi
Keyword(s):  
Ceramic Composite ◽  
Impact Force ◽  
Impact Damage ◽  
Incidence Angle ◽  
Fibrous Composite ◽  
Normal Incidence ◽  
Foreign Object ◽  
Foreign Object Damage ◽  
Post Impact ◽  
The Impact

The response of a SiC fibrous ceramic composite to foreign object damage was determined at ambient temperature and velocities ranging from 40 to 150 m/s. Target specimens were impacted, at a normal incidence angle and in a partially supported configuration, using 1.59 mm-diameter hardened steel ball projectiles. Qualitative analysis of the damage morphologies of targets and projectiles were made via scanning electron microscopy (SEM). In addition, the extent of impact damage was characterized by determining the post-impact strength of each target specimen as a function of impact velocity. Relative to the as-received strength, the fibrous composite showed limited strength degradation due to impact with the maximum reduction of 17 % occurring at 150 m/s. A quasi-static analysis of the impact force prediction was also made based on the principle of energy conservation and the results were verified via experimental data.

Design and tests of a non-contact Bernoulli gripper for rough-surfaced and fragile objects gripping

2020 ◽  
Vol 40 (5) ◽  
pp. 735-743
Author(s):  
Dong Liu ◽  
Minghao Wang ◽  
Naiyu Fang ◽  
Ming Cong ◽  
Yu Du
Keyword(s):  
Negative Pressure ◽  
Simulation Analysis ◽  
Structural Parameters ◽  
Mathematic Model ◽  
Parameters Optimization ◽  
Dynamics Simulation ◽  
Content Type ◽  
Design And Optimization ◽  
And Performance ◽  
The Impact

Purpose Varied shapes and sizes of different products with irregular rough surface and fragile properties give a challenge to traditional contact gripping. Single Bernoulli grippers are not suited to handle fragile objects as the impact of center negative pressure force could result in large deformation and stress which damage the materials, and they are also have some limitations for gripping objects with different large and small shapes. Thus, this paper aims to design a non-contact gripper for soft, rough-surfaced and fragile objects gripping with multi Bernoulli heads, which have optimal structures and parameters. Design/methodology/approach The compressed air is ejected into four Bernoulli heads through radial and long flow channels, then passes through four strip-shaped narrow gaps after fully developing in the annular cavity to provide negative pressure. Based on the mathematic model and the computational model, the key structural parameters affecting the gripping performance are selected, and parameters optimization of the gripper is performed by computational fluid dynamics simulation analysis and performance evaluation. The orthogonal method is used and L16 orthogonal array is selected for experimental design and optimization. The characteristics of the designed gripper are tested from the aspects of pressure distribution and lifting force. Findings From the applications in gripping different objects, the designed non-contact gripper can grip varied shapes and sizes of soft, rough-surfaced, fragile and sliced objects with little effect of torque. Originality/value In this paper, a non-contact gripper is designed for handling soft, rough-surfaced and fragile objects based on the Bernoulli principle. A systematic approach, which consists of modeling, simulation, optimization and measurement is provided for the non-contact gripper design and tests.

Analysis of a Novel Traverse Mechanism Driven by Non-Circular Gears with Fourier Pitch-Line Applied on Silk Reeling Machine

2014 ◽  
Vol 536-537 ◽  
pp. 1295-1300
Author(s):  
Jian Neng Chen ◽  
Jiang Jun Yan ◽  
Liang Sun ◽  
Ming Zhou
Keyword(s):  
Mathematic Model ◽  
Optimization Method ◽  
Simulation Software ◽  
The Novel ◽  
Interactive Optimization ◽  
Type Machine

Insufficiency of traditional EB-type silk reeling machine was pointed out after analyzing its traverse mechanism. A novel traverse mechanism driven by non-circular gears with Fourier pitch-line was proposed in order to make up the insufficiency of the traditional EB-type machine. Kinematical mathematic model of this mechanism was established and an aided analysis and simulation software was compiled. A group of preferable parameters was obtained by means of human-computer interactive optimization method. New advantages of uniform roundtrip velocity and better silk winding shape were achieved by the novel traverse mechanism compared to the traditional EB-type mechanism.

scholarly journals EXPERIMENT ON IMPACT DAMAGE OF CASTOR CAPSULE AND ITS INFLUENCING FACTORS OPTIMIZATION

2020 ◽  
Vol 61 (2) ◽  
pp. 87-96 ◽  
Author(s):  
Junming Hou ◽  
Yong Yang ◽  
Hongjie Zhu ◽  
Weixue Hu
Keyword(s):  
Water Content ◽  
Impact Force ◽  
Impact Damage ◽  
Impact Angle ◽  
Maximum Deformation ◽  
Combination Optimization ◽  
Damage Degree ◽  
Castor Seeds ◽  
Maximum Impact Force ◽  
The Impact

Castor is an important oil crop. Impact damage is critical in the process of castor capsule shelling, directly affecting the shelling effect of castor seeds. An experiment was taken to investigate it. To study the damage degree of castor capsule under the impact, water content, impact height, and impact angle were taken as test factors, and the maximum impact force and normal deformation were taken as test indexes. The combination optimization was carried out through the multi-objective genetic algorithm. The results show that the impact height has a significant effect on the maximum deformation (p<=0.01), and the water content and impact angle have a significant impact on the impact force (p<=0.05). The height and angle have a significant impact on the deformation (p<=0.01), and the water content has a significant impact on the deformation (p<=0.05).

Hysteresis Characteristic Model of Suspension for Vehicle Dynamics Simulation

2013 ◽  
Vol 706-708 ◽  
pp. 1385-1388
Author(s):  
Hsin Guan ◽  
Rong He ◽  
Rui Guo
Keyword(s):  
Dynamics Simulation ◽  
Friction Unit ◽  
Simulation Accuracy ◽  
Characteristic Model ◽  
Hysteresis Characteristic ◽  
Mechanism Model ◽  
Suspension Model ◽  
Spindle Position ◽  
Relationship Of ◽  
The Impact

Suspension model can be divided into vertical hysteresis characteristic model and suspension guide-mechanism model according to its function. The relationship of the force and displacement is described in the existing vertical characteristic model, which does not consider the impact of the frequency. In the existing guide-mechanism model, the centerline of suspension K&C experimental data is used as the basis of the spindle position and attitude correction, without considering the hysteresis area. The problems above will affect simulation accuracy of vehicle dynamic. In this paper, hysteresis characteristic model of suspension is built. The vertical hysteresis model consists of spring, Maxwell element and Dehl friction unit. While in guide-mechanism model, if the hysteresis region is not obvious, considering the asymmetry, upper and lower borderlines are used to instead the centerline, and if the hysteresis characteristic is obvious, the Fancher formula is used to describe hysteresis range. Results showed out that the model has a high accuracy and is able to accurately describe hysteresis characteristics of suspension by comparison with the suspension system K&C experimental results.

The Research on the Impact of the Underground Parking to the Microclimate in Residential Quarter

2013 ◽  
Vol 869-870 ◽  
pp. 178-184 ◽  
Author(s):  
Xiao Bin Yang ◽  
Zhi Long Chen ◽  
Hao Cai
Keyword(s):  
Green Space ◽  
Quality Parameters ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Outdoor Thermal Comfort ◽  
Residential Quarter ◽  
Residential District ◽  
Radiant Temperature ◽  
Comfort Parameters ◽  
The Impact

Currently, more and more residential district have built the underground parking and created more water and green space use the ground. The environment has been improved. This paper analyzed the microclimate of two planning programs use the microclimate fluid dynamics simulation software Envi-met, that one is have been made the underground parking planning, the other one is haven't. The results include microclimate parameters air quality parameters (the distribution of CO2) and the outdoor thermal comfort parameters (mean radiant temperature). By comparing the results of the two programs, this paper quantitative analyzed the influence and benefits of the underground parking to the microclimate in residential quarter.

Research on the Impact between Balls and Re-Circulating Mechanism of Ball Screws

2014 ◽  
Vol 551 ◽  
pp. 370-377 ◽  
Author(s):  
Zuo Ying Zhang ◽  
Wan Li Zhang ◽  
Chi Xu
Keyword(s):  
Contact Time ◽  
Impact Force ◽  
Impact Angle ◽  
Ball Screw ◽  
Hertz Contact ◽  
Elastic Coefficient ◽  
Impact Theory ◽  
Time Calculation ◽  
Relationship Of ◽  
The Impact

A Mechanical model of impact and contact between the ball and re-circulating mechanism in ball screw was brought forward according to the Hertz contact model and classical impact theory, along with the joint relationship of re-circulating mechanism and nut taken into account. Then the formula of the impact force and contact time was induced, which the elastic coefficient of restitution was considering in contact time calculation. Moreover, a special test unit was designed for contact time measurement and the contact time was measured. The result indicates that the new model proposed in this paper is closer to the practical situation than the old model proposed in literature. Based on works mentioned above, the influence of impact angle, parameters of structure and material on impact force was analyzed by numerical simulation.

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