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RISS 인기검색어
- 검색키워드
- 저자 : Zeng Wenhui (검색결과 4 건)
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On-position Measurement Method for Position-error Compensation in Machining
Wenhui Zeng,Fang Fang,Xiao Ma 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.7
Due to requirements of high-precision geometric tolerances for some high precision products, forming errors and clamping errors are unavoidable in the machining process. In this paper, an on-position measurement method is proposed for position error compensation based on the combination datum theory. Firstly, the mathematical representation model of the coaxiality of parts with the shallow holes is constructed based on the combination datum theory. Secondly, an on-position measurement method is proposed with constructing the mathematical model of the profiles of the surfaces based on laser displacement sensors (LDSs) to calculate the coaxiality error of parts on-position based on the combination datum theory. Based on it, the position of the spindle of the machine are adjusted to present the clutter again to compensate for position errors of the holes. Finally, the experimental results demonstrate the effectiveness and correctness of the proposed position error compensation method based on the on-position measurement device.
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Zeng Wenhui,Yi Jin,Lin Rongfu,Lu Wenlong 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.2
Blade bearing is the key mechanism of the controllable pitch propellers (CPPs) to adjust the pitch to change the thrust. In the marine environment, wear and deformation of the contact surface of the blade bearing are quite large, which may result in leakage to reduce the service life of CPP. However, most studies on tolerance optimization of blade bearing disregard deformations and wear, and it could result in unreasonable tolerances and impair the CPP’s service life. In this paper, to establish the statistical tolerance–cost–service life optimization model of the blade bearing of the CPP considering the marine environment effects in propellers, a prediction model about the relationship between the thrust and rotation speed of the CPP considering environment conditions of wind, wave, and ocean currents is constructed. Based on this, the wear and deformation are simulated according to the predicted rotation speed in the marine environment. Considering the deformation and wear in the marine environment, a tolerance analysis model of the assembly deviations of the blade bearing is introduced, and the assembly characteristics and functional requirements are established and converted into probability constraints to establish the service-life model based on statistical tolerance analysis and Monte Carlo simulation methods. Afterward, a statistical tolerance–cost–service life optimization model is established and transformed into a single-objective optimization problem through the normalization method and the weighted sum method, and solved by a meta-heuristic algorithm named cuckoo search. Finally, the application of the proposed model is demonstrated through a case involving the blade bearing of a CPP, and the optimized results show that the manufacturing cost of the blade bearing is reduced and its service life is extended.
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Modeling of Assembly Deviation with Considering the Actual Working Condition
Wenhui Zeng,Yunqing Rao 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.5
Generally, it would be more realistic to consider that the components of an assembly are flexible typically undergo some deformations. In addition, with the mobility of the parts, there is normally a wear between the contact surfaces. Ignoring the dynamic working conditions with these deformations and wear could lead to an inaccurate assembly deviation and further affect the performance, reliability and service life of products. This paper proposes modeling of assembly deviation by considering the actual working conditions to obtain the time-variant assembly gap during the service time. First, the dimensional and geometric tolerances of the parts are simulated by Monte Carlo simulation, and the assembly deviation caused by the tolerances is obtained based on modified Unified Jacobian–Torsor model. Second, the deformation of the surfaces of the parts induced by mechanical and thermal loads are calculated by finite element analysis. Third, the wear depth between the contact surfaces is derived by conducting wear tests under the simulating working condition. By integrating the deformations and wear into tolerance analysis model, the final assembly deviation is constructed by considering the actual working conditions. Finally, the proposed model is applied to the blade bearing of controllable pitch propeller (CPP) for determining the effect of the actual working conditions on its service life.
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Investigation of flow-regime characteristics in a sloshing pool with mixed-size solid particles
Cheng, Songbai,Jin, Wenhui,Qin, Yitong,Zeng, Xiangchu,Wen, Junlang Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.5
To ascertain the characteristics of pool sloshing behavior that might be encountered during a core disruptive accident of sodium-cooled fast reactors, in our earlier work several series of experiments were conducted under various scenarios including the condition with mono-sized solid particles. It is found that under the particle-bed condition, three typical flow regimes (namely the bubble-impulsion dominant regime, the transitional regime and the bed-inertia dominant regime) could be identified and a flow-regime model (base model) has been even successfully established to estimate the regime transition. In this study, aimed to further understand this behavior at more realistic particle-bed conditions, a series of simulated experiments is newly carried out using mixed-size particles. Through analyses, it is verified that for present scenario, by applying the area mean diameter, our previously-developed base model can provide the most appropriate predictive results among the various effective diameters. To predict the regime transition with a form of extension scheme, a correction factor which is based on the volume-mean diameter and the degree of convergence in particle-size distribution is suggested and validated. The conducted analyses in this work also indicate that under certain conditions, the potential separation between different particle components might exist during the sloshing process.
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