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Mathematical Models in Engineering最新文献

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Research on aero-engine fault diagnosis based on integrated neural network 基于集成神经网络的航空发动机故障诊断研究
Mathematical Models in Engineering Pub Date : 2019-06-30 DOI: 10.21595/MME.2019.20636
Shi Xiangyang
{"title":"Research on aero-engine fault diagnosis based on integrated neural network","authors":"Shi Xiangyang","doi":"10.21595/MME.2019.20636","DOIUrl":"https://doi.org/10.21595/MME.2019.20636","url":null,"abstract":"In this paper, the fault diagnosis method of Integrated Neural Network based on oil and Vibration information fusion is studied and applied to Aero-engine Fault Diagnosis. Then, taking an CFM56-3 Aero-engine as an example, the application of Integrated Neural Network Fault Diagnosis method in bearing fault diagnosis of Aero-engine is studied by using the idea of Vibration information and oil information Fusion Diagnosis, and the diagnosis method is validated with specific data. The diagnosis results show that compared with the traditional single information source Fault Diagnosis method, the integrated neural network Fault Diagnosis method is more efficient, can detect more fault modes, and has lower misdiagnosis rate.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45297175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Study on vibration characteristics of rolling mill based on vibration absorber 基于减振器的轧机振动特性研究
Mathematical Models in Engineering Pub Date : 2019-06-30 DOI: 10.21595/MME.2019.20871
Jialei Jiang, Shuang Liu, B. Liu, Yinghui Wang, Hui-feng Lu
{"title":"Study on vibration characteristics of rolling mill based on vibration absorber","authors":"Jialei Jiang, Shuang Liu, B. Liu, Yinghui Wang, Hui-feng Lu","doi":"10.21595/MME.2019.20871","DOIUrl":"https://doi.org/10.21595/MME.2019.20871","url":null,"abstract":"The vertical vibration often occurs during the rolling production, which has an influence on the accuracy of rolling mill. In order to effectively suppress the vertical vibration of the rolling equipment, the rolling mill model with vibration absorber device was established. Based on the main resonance singularity of the rolling mill system, the best combination of opening parameters was obtained. The best combination of opening parameters helps the rolling mill system work in a stable area. Finally, the effects of different vibration absorber parameters on the vibration characteristics of the rolling mill system were analyzed. Results show that the vibration absorber device can effectively improve the stability of the rolling mill system.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47511845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Vibroimpact mechanism in one separate case 振动冲击机制在一个单独的情况下
Mathematical Models in Engineering Pub Date : 2019-06-30 DOI: 10.21595/MME.2019.20818
K. Ragulskis, L. Ragulskis
{"title":"Vibroimpact mechanism in one separate case","authors":"K. Ragulskis, L. Ragulskis","doi":"10.21595/MME.2019.20818","DOIUrl":"https://doi.org/10.21595/MME.2019.20818","url":null,"abstract":"It is known that in the vibroimpact system at the chosen values of parameters linear relationship between impact velocities and eigenfrequencies may exist. The purpose of this paper is to reveal the qualities of the systems of this type. Investigations are performed by analytical and numerical methods. It is determined that in the systems of this type nonlinear solutions with infinite series of harmonics exist. Multivalued stable and unstable regimes do not exist in the systems. The obtained analytical relationships enabled to reveal new qualities of the systems and to make useful conclusions.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41976241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Investigation of the model for transient beating phenomenon in symmetric structures with Braille elements 具有盲文单元的对称结构瞬态跳动现象模型研究
Mathematical Models in Engineering Pub Date : 2019-03-31 DOI: 10.21595/MME.2019.19780
E. Kibirkštis, A. Voloshin, K. Vaitasius, J. Pyr’yev, I. Venytė, S. Havenko, K. Ragulskis, L. Ragulskis
{"title":"Investigation of the model for transient beating phenomenon in symmetric structures with Braille elements","authors":"E. Kibirkštis, A. Voloshin, K. Vaitasius, J. Pyr’yev, I. Venytė, S. Havenko, K. Ragulskis, L. Ragulskis","doi":"10.21595/MME.2019.19780","DOIUrl":"https://doi.org/10.21595/MME.2019.19780","url":null,"abstract":"Results of experimental investigations of vibrations of a circular plate under impact loading are presented. In such structures when there are small defects causing non-symmetry, such as Braille elements, transient beating phenomenon is observed. Simplified mathematical model for the investigation of this experimentally determined transient beating phenomenon is proposed and numerical results based on this model are obtained and investigated. From the presented results qualities of the envelope function in the investigated transient beating phenomenon are determined.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43367866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mathematical modeling of first order process with dead time using various tuning methods for industrial applications 工业应用中具有死区时间的一阶过程的各种调整方法的数学建模
Mathematical Models in Engineering Pub Date : 2019-03-31 DOI: 10.21595/MME.2019.20447
S. Shanmugam, Y. Duraisamy, Meenakumari Ramachandran, S. Arumugam
{"title":"Mathematical modeling of first order process with dead time using various tuning methods for industrial applications","authors":"S. Shanmugam, Y. Duraisamy, Meenakumari Ramachandran, S. Arumugam","doi":"10.21595/MME.2019.20447","DOIUrl":"https://doi.org/10.21595/MME.2019.20447","url":null,"abstract":"The proposed research involves Mathematical modeling for first order process with dead time using various tuning methods for industrial applications. Different tuning methods are proposed. Proposed method selection depends on plant operating conditions and also depending upon the process dynamics. The PID controller is most widely used for industrial process control. Modeling were developed for modified internal control model [4-6] in this proposed research. The proposed work is the modeling and simulation of three different first order processes with dead time. The standard controller tuning method is used to obtain the steady state response of first order with dead time.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43805999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
A study on determining the maintenance task interval of the flight trainer aircraft system 飞行教练机系统维修任务间隔确定的研究
Mathematical Models in Engineering Pub Date : 2019-03-31 DOI: 10.21595/MME.2019.20517
Xiangyang Shi
{"title":"A study on determining the maintenance task interval of the flight trainer aircraft system","authors":"Xiangyang Shi","doi":"10.21595/MME.2019.20517","DOIUrl":"https://doi.org/10.21595/MME.2019.20517","url":null,"abstract":"To formulate a plan of maintenance, the key aspect is to determine the maintenance intervals, as the maintenance types and maintenance intervals of each system are provided in the maintenance plan, and the types of each system are usually fixed. In this paper, the using data of aircraft components was employed to determine the maintenance interval. The least-squares method was adopted to estimate the Weibull distribution parameter. Then, the maintenance task interval model was set up. At last, the method was verified by using the reliability data of landing gear in in CESSNA172R.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49453789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on fault diagnosis of B737 aircraft fuel system based on improved BP neural network 基于改进BP神经网络的B737飞机燃油系统故障诊断研究
Mathematical Models in Engineering Pub Date : 2019-03-31 DOI: 10.21595/MME.2019.20536
Shi Xiangyang
{"title":"Research on fault diagnosis of B737 aircraft fuel system based on improved BP neural network","authors":"Shi Xiangyang","doi":"10.21595/MME.2019.20536","DOIUrl":"https://doi.org/10.21595/MME.2019.20536","url":null,"abstract":"In this paper, an improved BP neural network algorithm is applied to the fault diagnosis of aircraft fuel system. The simulation results show that the algorithm has the characteristics of fast diagnosis speed and low misdiagnosis rate, and lays a foundation for the development of aircraft fuel fault diagnosis expert system based on neural network.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49663289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Optimization of palm methyl ester and its effect on fatty acid compositions and cetane number 棕榈甲酯的优化及其对脂肪酸组成和十六烷值的影响
Mathematical Models in Engineering Pub Date : 2019-03-31 DOI: 10.21595/MME.2019.20469
S. Satya, Aditya Kolakoti, B. Nagaraju, R. Shyamsundar, R. Rao
{"title":"Optimization of palm methyl ester and its effect on fatty acid compositions and cetane number","authors":"S. Satya, Aditya Kolakoti, B. Nagaraju, R. Shyamsundar, R. Rao","doi":"10.21595/MME.2019.20469","DOIUrl":"https://doi.org/10.21595/MME.2019.20469","url":null,"abstract":"This paper proposes the Taguchi based optimization technique for the production of biodiesel from palm oil. For this purpose, L9 orthogonal array was successfully used for better yield estimation by using Minitab-18 software. Different process variables like molar ratio, catalyst concentration, reaction time and reaction temperature were studied. A predicted yield of 92.06 % was achieved by regression analysis by maintaining the process variables of molar ratio 5:1 (methanol to oil), 4 grams of catalyst concentration (NaOH), 180 minutes of reaction time and 44°C of reaction temperature. Experimentations were conducted on the same process variables and achieved a yield of 91.65 %. By this it is clear that both experimentation and regression analysis by Taguchi are in good agreement with an error of 0.41 % which may be acclaimed as experimental error. The fatty acid compositions (FAC) were also analyzed and it is found that 37.12 % saturated and 62.88 % unsaturated fatty acids present in the palm methyl ester (PME). By using the FAC of PME the Cetane number was predicted as 55.38. The predicted Cetane number from FAC tally with experimental Cetane number. The PME is characterized for different fuel properties by following the international standards. And it is concluded that catalyst concentration and reaction temperature are the important parameters which influence PME yield, Taguchi based optimization technique will helps in predicting the maximum yield with minimum number of experiments.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48731421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Dynamic characteristic analysis on the bit lateral steering force of push-the-bit rotary steerable bottom hole assembly 推钻旋转导向井底钻具组合横向导向力动态特性分析
Mathematical Models in Engineering Pub Date : 2018-12-31 DOI: 10.21595/MME.2018.20235
Heng Wang, Z. Guan, Guo-shan Zhao
{"title":"Dynamic characteristic analysis on the bit lateral steering force of push-the-bit rotary steerable bottom hole assembly","authors":"Heng Wang, Z. Guan, Guo-shan Zhao","doi":"10.21595/MME.2018.20235","DOIUrl":"https://doi.org/10.21595/MME.2018.20235","url":null,"abstract":"A dynamic finite element model was established to characterize the motion state of the rotary steerable bottom hole assembly (RSBHA). Then the steering lateral force on bit was obtained after the motion equation was solved. The relation between the bit steering force and the pads offset pointing towards the high side direction of the borehole was gotten and the effects of the rotary speed on the bit lateral steering force were analyzed. Results showed that the near-bit stabilizer would contact the wellbore wall with the increasing of the pads offset, resulting in an inflection point presenting on the relation curve between the bit inclination force and the pads offset value. The larger pads offset value was, the more concentrated bit side cutting would be. Rotary speed had a small effect on time average of the bit lateral steering force but could enlarge the action range on both sides of the high side direction of the borehole.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47039092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Simplified theoretical treatment of lateral structural properties under crowd excitation 人群激励下横向结构性能的简化理论处理
Mathematical Models in Engineering Pub Date : 2018-12-31 DOI: 10.21595/MME.2018.20177
Yun Dong, Yan-an Gao, Ye Zhu, Peng Zhang
{"title":"Simplified theoretical treatment of lateral structural properties under crowd excitation","authors":"Yun Dong, Yan-an Gao, Ye Zhu, Peng Zhang","doi":"10.21595/MME.2018.20177","DOIUrl":"https://doi.org/10.21595/MME.2018.20177","url":null,"abstract":"Walking crowd-induced lateral vibrations on slender structures have attracted considerable attention. The improper vibration of a structure adversely affects human comfort. To explore the effects of crowds on lateral structural properties, a pedestrian from a crowd is simulated by a walking bipedal robot. A simplified theory for structural vibration is proposed based on the assumptions of uniform distribution and synchronized walking of pedestrians. This theory can be used to describe the effect of the change in crowd size on lateral structural damping and the frequency of the structure. The method can estimate the variations in structural properties in the case of a certain crowd for engineering design. The results show that the increase in crowd size results in decrease in structural natural frequency in the lateral direction, but increases structural damping. The influence of the crowd on structural properties agrees well with the non-simplified model. Change in walking frequency has little influence on the structural properties. However, the continuous increase in crowd size on structure top causes a non-convergent amplification of dynamic response under a resonant walking excitation. This research provides a quantitative assessment on the effect of crowd size on the change in structural properties for structural design or serviceability evaluation.","PeriodicalId":32958,"journal":{"name":"Mathematical Models in Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45646342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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