-
Structural design for planetary roller screw mechanism based on the developed contact modelling（22年基于接觸建模的行星滾滾柱絲杠結構設計）
The structural design of planetary roller screw mechanism (PRSM) with lower contact stress is beneficial to delay
the fatigue failure and prolong the service life. However, few studies focused on this field and a reasonable
contact model is therefore required due to its complexity structure. In this paper, a developed contact model is
established for PRSM, and a process-based parameterization method is proposed to precisely calculate the
contact characteristics along with the change of parameters. Based on the in-depth study of the parameter
sensitivities of contact characteristics, the structure design to reduce contact stress for PRSM is realized through
the multi-objective optimization under the proposed geometric constraints. The validity of this model is well
verified by finite element method.
閱讀：
2022-04-10
-
.png)
Fatigue lifespan of a planetary roller-screw mechanism（22年行星滾柱絲杠機構的疲勞壽命）
Electro-mechanical actuators including planetary roller screw (PRS) support cyclic loads in
aeronautical conditions. PRS multiple thread contacts between screw, rollers and nut allow the
mechanism to support large loads. However, aeronautical accreditation requires fine prediction
of fatigue lifespan. In this paper, a fatigue design strategy for PRS mechanisms is proposed
combining Hertz contact model and a multi-axial fatigue criterion. The method is applied on
two examples, one standard and one inverted PRS.
The lifespan of PRS mechanism depends on maximal Dang Van stress. The Hertz sliding angle (Hertz contact main direction/sliding velocity) was introduced to analyze PRS performances.
For both examples, the maximum stress at thread contact were located in bulk material but not
at the surface. Dang Van stress mainly depended on curvature ratio, Hertz sliding angle and
loads. Based on this analysis, Dang Van criterion was implemented to derive the loading domain
of infinite lifespan of the mechanism. Critical contact was not always on the roller-screw side.
閱讀：
2022-01-16
-
凸凹接觸式行星滾柱絲杠的嚙合承載特性（Ｍｅｓｈｉｎｇ ａｎｄ ｂｅａｒｉｎｇ ｃｈａｒａｃｔｅｒｉｓｔｉｃｓ ｏｆ ｃｏｎｖｅｘ-ｃｏｎｃａｖｅ ｃｏｎｔａｃｔ ｐｌａｎｅｔａｒｙ ｒｏｌｌｅｒ ｓｃｒｅｗ ｍｅｃｈａｎｉｓｍ）
摘 要： 為提高行星滾柱絲杠的承載能力，分析優化行星滾柱絲杠的螺紋牙型，提出一種基于凸凹接觸的嚙合方式。 設計凹
圓弧的絲杠和螺母牙型輪廓，基于空間嚙合理論推導螺紋曲面方程、空間嚙合方程，并基于赫茲接觸理論和變形協調方程建
立負載分布模型；采用數值計算的方法對嚙合點位置、軸向間隙和接觸應力進行求解，系統揭示了牙側角、螺距等參數對嚙合
點位置、軸向間隙和負載分布的影響規律，并對比分析標準式和凸凹式行星滾柱絲杠的接觸應力。 結果表明：牙側角對軸向
間隙的影響最大，絲杠和螺母的凹圓弧半徑變化對接觸點位置和軸向間隙幾乎沒有影響，但對承載能力影響十分明顯；與標
準式相比，凸凹接觸式行星滾柱絲杠的承載能力有較大的提高，絲杠和螺母凹圓弧半徑越小承載能力提高越明顯。 本研究為
研制高承載、高使用壽命的行星滾柱絲杠提供了優化設計和分析的依據。
閱讀：
2022-01-15
-
Investigation on the mechanical behavior of planetary roller screw with the effects of external loads and machining errors
Abstract: Planetary roller screws are the key mechanical components used in linear motion and could be subjected to radial and axial loads in application. However, the effect of radial force on load distribution and fatigue life has not been considered in previous studies...
閱讀：
2021-06-24
-
.jpg)
Analysis of transient mixed elastohydrodynamic lubrication in planetary roller screw mechanism（21年行星滾柱絲杠瞬態混合彈流潤滑分析）
Previous lubrication studies for planetary roller screw (PRSM) are mainly concentrated on steady-state condition
without the consideration of entrainment angle. However, PRSM always operates in transient situations with
frequent startup and shutdown process. In this paper, uneven friction distribution, the influence of helix angle on
lubricating properties and transient behavior in the roller-screw interface are analyzed comprehensively based
on transient mixed-EHL model, which considers real three-dimensional (3D) machined roughness and arbitrary
entrainment velocity. The results show that smaller helix angle is beneficial to improve the lubrication performance. Increasing the rotating speed and declining axial load can moderate the uneven friction distribution.
Besides, a relatively large angular acceleration may enlarge the film thickness and reduce the friction at the shut
down status. The numerical simulation model can be utilized as a design optimization tool for the PRSM.
閱讀：
2021-06-17
-
精密蝸桿傳動副磨損量補償及側隙調控方法
蝸桿傳動是機械傳動的一種主要形式，具有傳動比范圍寬、結構緊湊、體積小、運動平穩、噪聲低等優點，除被廣泛應用于動力傳動外，也是機床及精密儀器精密圓分度機構的首選部件...
閱讀：
2021-05-25
-
蝸桿傳動的發展及其分類
摘要：回顧了蝸桿傳動的發展歷程，并闡述了各種蝸桿傳動的優缺點。從蝸桿傳動中的首創體外形、齒部位置及嚙合區域、首創面齒廓三個方面出發對蝸桿傳動進行分類，以元素周期表為原型得出蝸桿傳動系統分類表，表中各類型、各系列及各形式之間在幾何結構和傳動性能上存在一定的普遍性和規律性...
閱讀：
2021-05-25
-
差動式行星滾柱絲杠承載特性分析
摘要：基于空間嚙合理論與赫茲接觸理論展開差動式行星滾柱絲杠承載特性分析，綜合考慮由滾柱與絲桿初始嚙合點偏置引起的接觸點位置變化對承載特性的影響，建立差動式行星滾柱絲杠空間嚙合...
閱讀：
2021-05-25
-
Multi-objective optimization of planetary roller screw mechanism based on improved mathematical modelling（21年行星滾柱絲杠基于改進的數學建模的多目標優化）
The optimization of obtaining the most uniform load distribution is important for the load carrying capacity
design of the planetary roller screw mechanism (PRSM). However, the stiffness matrix of PRSM in traditional
method based on the relationship between load and deformation of the thread may be destroyed when threads
are no longer in contact due to machining errors, which would bring convergence problem in optimization
process. In this paper, the mathematical model is firstly established to overcome the above drawbacks by proposing an improved iterative algorithm. Then, the multi-objective optimization is conducted to search the best
designed pitches for the most uniform load distribution on both the screw-roller and nut-roller interfaces, and
results are verified by the finite element method.
閱讀：
2021-04-15
-
A Multiscale Accuracy Degradation Prediction Method of Planetary Roller Screw Mechanism Based on Fractal Theory Considering Thread Surface Roughness（21年一種行星滾柱絲杠多維度精度下降預測方法）
Abstract: The wear problems are vital to the planetary roller screw mechanism (PRSM) as they
have a great influence on transmission accuracy, working efficiency, and service life. However,
the wear characteristics of the PRSM have been rarely investigated in the past. In this paper,
a multiscale adhesive wear model is established by incorporating the effective wear coefficient and
considering the thread surface roughness. The variation of surface roughness is characterized by
the two-dimension Majumdar–Bhushan (MB) function. The multi-asperity contact regimes are used
to estimate microcontact mechanics of the rough interface. Moreover, the influences of surface
roughness, material properties, and working conditions on the wear depth and precision loss of the
PRSM are studied in detail. The results reveal that as the surface roughness increases, the total actual
contact area, wear depth, and precision loss rate rise. In addition, the adhesive wear increases with
the growth of the axial load, and decreases with the increase in the material hardness and material
elastic modulus ratio to a certain extent. The investigation opens up a theoretical methodology to
predict the wear volume and precision loss with regard to thread surface roughness, which lays the
foundation for the design, manufacturing, and application of the PRSM.
閱讀：
2021-05-23
-
.jpg)
Research on Fractal Model of Load Distribution and Axial Stiffness of Planetary Roller Screw Mechanism Considering Surface Roughness and Friction Factor（22年載荷分布和軸向剛度的分形模型研究）
The effects of surface roughness and material properties of the planetary
roller screw mechanism (PRSM) on the axial stiffness and load distribution
are rarely studied. In this paper, the load distribution model is presented by
incorporating into friction factor and surface microtopography. The
microcontact model is built by considering elastic and plastic regimes to
calculate the total actual contact area. Moreover, the load distribution model is
modified by introducing surface microcontact coefficient. Then, the influences
of the nut position, fractal dimension, fractal roughness, friction factor, axial
load, and material yield strength on the axial stiffness and load distribution
are studied in detail. The numerical results show that the axial stiffness rises
with the increment of the nut position, axial load, fractal dimension, and yield
strength, and reduces with the fractal roughness and friction factor
increasing. In addition, the uniformity of the load distribution increases with
the increment of the fractal roughness, and drops with the increase of the
fractal dimension and material yield strength. This investigation lays the
foundation for the design, manufacturing, and use of the PRSM.
閱讀：
2021-03-09
-
.jpg)
Wear Behavior of Martensitic Stainless Steel in Rolling-Sliding Contact for Planetary Roller Screw Mechanism: Study of the WC/C Solution（16年馬氏體不銹鋼在行星滾柱絲杠滾動滑動接觸中的磨損行為）
The planetary roller screw mechanism is used in the aeronautics industry for electro-mechanical actuators
application. It transforms a rotational movement into a translation movement, and it is designed for heavy
loads. The main components are made of martensitic stainless steel, and lubricated with grease. Like most
usual rolling mechanisms, smearing and jamming can occur before the theoretical fatigue lifetime, especially
in poor lubrication conditions. The actuated load is carried by small contacts between the threads of the screw,
the rollers and the nut. The static single contact can be described as an ellipsoid on flat contact with high
contact pressure (3-4 GPa). The motion consists of rolling with spin associated with side slip up to 10%. The
aim of our study is to investigate the wear behavior of the WC/C coated contact for different operating and
design parameters such as load, speed and slip ratio. The contact is simulated by a free rolling roller loaded on
a rotating disk. A specific apparatus is used to create a contact with a side slip component, i.e. perpendicular
to the rolling direction. The wheel rolling speed and the tangential force generated by the slip ratio are
measured. The wear behavior of a WC/C carbon-based composite coating is investigated. It reveals
progressive wear and cracking in the rolling direction, i. e. perpendicular to the sliding direction. A wear map
has been drawn to establish the damage mode depending on the contact conditions.
閱讀：
2016-11-02
主站蜘蛛池模板：
上海消防器材|水雾喷头|水幕喷头|螺旋喷头|雾化喷头|泡沫喷头 - 上海舜丹消防设备有限公司
|
鸟语林-百鸟园-不锈钢丝绳网-钢丝网-瓦片防坠网-围网-河北中重钢结构工程有限公司
|
优质课网_收录全国及各省市最新优质课视频,说课视频,名师课例课堂实录,高效课堂教学视频,观摩展示公开示范优秀课视频，教学大赛视频！
|
可燃气体报警器-有毒有害气体检测仪-气体检测分析系统-宁波市高品科技有限公司
|
洗地机,洗地机价格,扫地机,工业吸尘器,手推式洗地机,驾驶式洗地机,北京洗地机【北京高美环保科技有限公司】
|
上进电缆（嘉兴）股份有限公司官网 - 光伏电缆|防火电缆|电力电缆|铝合金电缆专业生产厂家
|
深圳专利申请-深圳商标注册-深圳国高认定 - 深弘知识产权
|
室内通风系统，新风系统专卖，建筑通风系统专卖_绿岛风官网
|
铸铁平台,三维柔性焊接平台,划线平台,大理石平台,检验平板,花岗石平台_泊头市恒量机械设备有限公司
|
曙海培训-ZEMAX培训射频培训无线电培训GMS培训EMC培训电磁兼容性培训Maxwell培训欧姆龙培训procast培训可靠性培训光学培训工业机器人培训NI培训Linux培训5G培训Hadoop培训CFD培训
|
清洁公司| 保洁公司| 东莞清洁| 东莞保洁|壹壹清洁
|
商易网-b2b电子商务平台网站大全免费B2B发布供求信息网站
|
皮革耐折试验机-消字率测试仪-面具全视野测试仪-东莞市誉扬检测仪器有限公司
|
阻垢剂|缓蚀剂|杀菌剂|分散剂|水处理剂|印染助剂|水处理药剂|造纸助剂|膜阻垢剂|缓蚀剂|HEDP|ATMP|螯合剂-山东凯瑞化学有限公司 水处理药剂生产厂家
|
室内去除甲醛检测治理十大品牌_去除甲醛公司加盟-优吸环保科技有限公司集团总部官网
|
长春衡宇机械 食品干燥机 微波灭菌机 连续真空干燥机-干燥行业先进企业
|
长沙考研-长沙考研辅导学校-长沙领航教育科技有限公司
|
苏州不锈钢_江苏不锈钢_江苏不锈钢板_苏州模具钢_苏州合金钢_苏州特种合金_苏州不锈钢板_304不锈钢棒_苏州塞硒五金制品有限公司
苏州ERP定制|苏州CRM|苏州OA|苏州BPM|进销存管理系统-苏州中尚信息科技有限公司
|
联系我们果博东方在线开户客服电话：19038688886 - 黑龙江旺广机械设备有限公司
|
嘉兴市南湖斋食品股份有限公司_南湖斋
|
消防排烟风机|3C排烟风机|正压送风机|高温排烟风机|柜式排烟风机-山东锦松环境设备有限公司
|
陕西教师资格网-陕西教师资格考试网|
两面针（江苏）实业有限公司－原两面针（扬州）酒店用品有限公司
|
天津津腾,微孔滤膜,隔膜真空泵,针式过滤器-艾科仪器
|
耐腐蚀磁力泵,直立式耐酸碱泵,立式耐酸碱泵,自吸式耐酸碱泵-杰凯泵业【官网】
|
上海消防器材|水雾喷头|水幕喷头|螺旋喷头|雾化喷头|泡沫喷头 - 上海舜丹消防设备有限公司
|
泥沙泵_脱硫泵_潜水泵_离心泵_渣浆泵厂家|诚信为先-泰安华泰泵业制造有限公司
|
真空电镀机_镀膜机厂家_离子镀膜机_磁控溅射镀膜设备_镀钛设备-江苏驰诚科技发展有限公司
|
紫外交联仪,紫外透射仪,紫外灯-上海析浦科学仪器有限公司
|
亚澳农机-亚澳南阳农机股份公司,旋耕机,旋播机,旋播施肥机,免耕播种机,旋耕播草多用机,果园机械-首页
|
中华收藏网-中藏网-藏品拍卖|字画拍卖|艺术品拍卖|古玩城|收藏资讯|古玩交易|书画定制
|
美标球阀_美标闸阀-浙江川一阀门有限公司
|
济宁卡尔迪机械制造有限公司_铁路换枕机_升降驾驶室_挖机加高底盘_加长臂
|
重庆风机_风阀_风口-重庆仁龙风机有限公司
|
景观灯-庭院灯-多功能路灯-高杆灯-智慧灯杆生产厂家-扬州景尚光电
|
上海办公室租赁-写字楼出租、创意产业园区厂房招商、孵化器众创联合办公空间出租网
|
专注欧美工业控制自动化设备-MRO工业品采购服务-科电远扬
|
武汉东湖高新集团股份有限公司官网
|
苏州交通设施_道路划线_停车场划线_厂区划线_环氧地坪厂家-推荐【飞扬市政交通设施公司】专注交通设施8年！
|
幼儿园设计公司/南昌酒店装修/办公室/餐厅/民宿/店面/展厅/装修设计公司-益昌装饰集团
|
河南矿山重型起重机械有限公司|
F58712BEE7444EC3BE13CD344F298ADD.jpg)
.jpg)
9D22C468462D42D89B134C12F59C6E0E.png)
.png)
.jpg)
