scholarly journals A tolerance design method for hydrostatic guideways motion accuracy based on error averaging effect

Procedia CIRP ◽  
2018 ◽  
Vol 75 ◽  
pp. 196-201 ◽  
Author(s):  
Jun Zha ◽  
Yaolong Chen ◽  
Zhiwei Wang
Keyword(s):  
Design Method ◽  
Tolerance Design ◽  
Error Averaging

scholarly journals A Hybrid Tolerance Design Method for the Active Phased-Array Antenna

2020 ◽  
Vol 10 (4) ◽  
pp. 1435 ◽  
Author(s):  
Guodong Sa ◽  
Zhenyu Liu ◽  
Chan Qiu ◽  
Jianrong Tan
Keyword(s):  
Design Method ◽  
Array Antenna ◽  
Tolerance Design ◽  
Geometric Errors ◽  
Discrete Elements ◽  
Phased Array Antenna ◽  
Form Errors ◽  
Position Errors ◽  
Working Frequency ◽  
Effectiveness And Efficiency

With the increase of the working frequency of the array antenna, tolerance design has become increasingly important. The state-of-art tolerance design methods mainly deal with the position tolerance of the discrete elements. However, the geometric errors of the whole array have resulted from two aspects: (1) the position errors of the discrete elements and (2) the form errors of the continuous reflection plate. To optimize the position tolerance and flatness simultaneously, a hybrid tolerance design method is proposed. First, the relation between the performance of the array antenna and hybrid tolerances was determined based on the second order Taylor expansion. Then the expectation and variance of the performance were derived. Finally, the hybrid tolerances were optimized and the performance of the antenna was improved. Simulation results proved the effectiveness and efficiency of the proposed hybrid tolerance design method.

scholarly journals Assembly Tolerance Design Based on Skin Model Shapes Considering Processing Feature Degradation

2019 ◽  
Vol 9 (16) ◽  
pp. 3216 ◽  
Author(s):  
Ci He ◽  
Shuyou Zhang ◽  
Lemiao Qiu ◽  
Xiaojian Liu ◽  
Zili Wang
Keyword(s):  
Design Method ◽  
Joint Probability ◽  
Joint Probability Distribution ◽  
Manufacturing Cost ◽  
Tolerance Design ◽  
Sampling Point ◽  
Skin Model ◽  
Machined Surface ◽  
Assembly Tolerance ◽  
Five Axis

To increase the reliability and accuracy of tolerance design, more and more research works are considering not only orientation and position deviations; they are also forming errors in tolerance modeling. As a direct cause of form errors in industrial mass production, the processing features of the machining system degrade over time. Under the Industry 4.0 paradigm, an assembly tolerance design method based on Skin Model Shape is proposed to take the effect of degrading processing features into consideration. A continuous-time multi-dimensional Markov process is trained through maximum likelihood estimation based on the nodal sampling point set on the machined surface. Degradation of the machined surface is modeled based on the joint probability distribution of nodal displacements. Assembly force constraints and assembly entity constraints are applied to spatial assembly simulations. Tolerance synthesis takes the manufacturing cost and assembling probability as design objectives. A design example of the rotary feed component in a five-axis machine tool is proposed for explanation and verification.

A Robust Tolerance Design Method Based on Fuzzy Quality Loss

2006 ◽  
Vol 1 (1) ◽  
pp. 101-105 ◽  
Author(s):  
Yan-long Cao ◽  
Jian Mao ◽  
Jiang-xin Yang ◽  
Zhao-tong Wu ◽  
Li-qun Wu
Keyword(s):  
Design Method ◽  
Tolerance Design ◽  
Quality Loss

Tolerance design by set-based design method

2019 ◽  
Vol 2019.29 (0) ◽  
pp. 2313
Author(s):  
Haruo ISHIKAWA ◽  
Yasuhiro FUKUNAGA
Keyword(s):  
Design Method ◽  
Tolerance Design ◽  
Set Based Design

Design of lightweight wooden floors to avoid human discomfort

1988 ◽  
Vol 15 (2) ◽  
pp. 254-262 ◽  
Author(s):  
Ian Smith ◽  
Ying Hei Chui
Keyword(s):  
Natural Frequencies ◽  
Design Method ◽  
Economic Cost ◽  
Dynamical Behaviour ◽  
Design Solution ◽  
Tolerance Design ◽  
Mean Square ◽  
User Perception ◽  
Forcing Function ◽  
Domestic Setting

This paper gives "designer usable" methods for predicting the dynamical behaviour of lightweight wood-joist floors covered with semirigidly attached wood-based sheathings of materials such as plywood or waferboard. Included are methods for predicting natural frequencies and root-mean-square (rms) acceleration under a defined forcing function. It is proposed that this rms acceleration be the criterion for estimating user perception based tolerance of a projected design solution in the domestic setting. Case studies suggest that the economic cost of producing more rational designs is small. Consideration is, at this stage, limited to floors that are rectangular in plan and contain no openings nor intermediate support partitions. Suggestions are made as to methods of building floors with acceptable vibrational performances, together with recommendations for further research. Key words: floors, wood, vibrations, human tolerance, design method.

The Tolerance Coordination Design Method of Related Feature and Datum Features When Applying Material Condition

2018 ◽  
Author(s):  
Yuguang Wu ◽  
Zhiqian Mei
Keyword(s):  
Coordinate System ◽  
Design Method ◽  
The Other ◽  
Tolerance Design ◽  
Geometric Tolerance ◽  
Material Condition ◽  
Related Feature ◽  
Relationship Of ◽  
Crank Mechanism ◽  
Coordination Design

When the datum features apply a material condition, the tolerance of a related feature must coordinate with its datum features. The tolerance coordination design of the related feature with its datum features is an important issue; an uncoordinated tolerance will give rise to an unnecessarily tight tolerance of a target geometrical feature or an invalid application of the material condition. In this paper, a coordination design method is proposed. The notion of the shift tolerance is used to establish the coordination relationship of the tolerance between the related feature and its datum features. The calculation mechanism of the shift tolerance for two datum features applying a material condition is described. To calculate the shift tolerance of the datum features, the datum feature simulator is used to construct the measurement coordinate system and the design coordinate system. For the different combination of two datum features applying a material condition, the relative motion of the design coordinate system with respect to the measurement coordinate system is represented by the parallel-crank mechanism, and the length of the crank is used to calculate the shift tolerance. Based on the shift tolerance, two criteria of the tolerance design at applying material condition are studied, one is the coordination guideline for the geometric tolerance of the related feature and the dimensional tolerance of the datum feature; the other criterion is the coordination guideline for the dimension tolerance between two datum features. Finally, two case studies are introduced to verify reasonableness of the proposed criteria and method.

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