Design of Highly Loaded Slewing Bearings – The Collaborative Project HBDV

Research in cognitive development has highlighted that early numeracy skills are associated with later math achievement, suggesting that these skills should be targeted in early math education. Here we tested whether tools used by researchers to assess mathematical thinking could be useful in the classroom. This paper describes a collaborative project between cognitive scientists and school board researchers/educators implementing numeracy screeners with kindergarten students over the course of three school years. The Give-A-Number task (Wynn, 1990) was used with first-year kindergarten students and the Numeracy Screener [BLINDED] with second-year kindergarten students. Results indicated that educators (N = 59) found the tools feasible to implement and helpful for exploring their students’ thinking and targeting instruction. The Educators’ feedback also helped inform improvements to the implementation of the tools and future directions for both the schools and the researchers. This work emphasizes the importance of transdisciplinary collaboration to address the research-practice gap.

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Direct clear juice: a summary of experiences gained in the production of clear juice in a sugarcane diffuser

Sugar Industry ◽

10.36961/si18735 ◽

2017 ◽

pp. 527-533

Author(s):

Paul Jensen ◽

Steve Davis

Keyword(s):

Flow Path ◽

Full Scale ◽

Laboratory Scale ◽

Collaborative Project ◽

Laboratory Results ◽

Research Institute

The term ‘Direct Clear Juice’ (DCJ) refers to the production of clear juice (CJ) within a modified sugarcane diffuser, thus negating the need for further juice purification in a settling clarifier. The feasibility of producing CJ by filtering treated diffuser juice through a shredded cane bed was demonstrated on a laboratory scale at the Sugar Milling Research Institute NPC (SMRI) and reported at the 2013 ISSCT congress. Factory trials were subsequently conducted at Tongaat Hulett’s Maidstone factory where the promising laboratory results were replicated in a full-scale diffuser. The production of DCJ requires consideration of the juice flow path in the diffuser, the method of lime and flocculant addition, and the screening of the juice after the diffuser. This paper summarises the results and learnings from the DCJ trials between 2011 and 2015. The development of the DCJ technology has been a collaborative project between the SMRI and Tongaat Hulett Sugar.

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Intervention

10.1093/oso/9780199355914.003.0015 ◽

2017 ◽

Author(s):

Emily Payne

Keyword(s):

Collaborative Project

Collaboration is usually associated with the co-presence of those involved; but in this Intervention Emily Payne discusses a more complex and convoluted process extending over forty years, and involving different performers. Payne’s account of Antony Pay’s 2013 recording of Alexander Goehr’s Paraphrase for solo clarinet, premiered by Alan Hacker in 1969, reveals a ‘back story’ that casts new light on the network of distributed relationships that lies behind this unusual collaborative project.

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Numerical Investigation of Passive Flow Control Using Wavy Blades in a Highly-Loaded Compressor Cascade

Volume 2A: Turbomachinery ◽

10.1115/gt2018-76147 ◽

2018 ◽

Cited By ~ 1

Author(s):

Bo Wang ◽

Yanhui Wu ◽

Kai Liu

Keyword(s):

Numerical Investigation ◽

Flow Structure ◽

Cross Flow ◽

Leading Edge ◽

Control Flow ◽

Streamwise Vortices ◽

Compressor Cascade ◽

Control Effect ◽

Suction Surface ◽

Highly Loaded

Driven by the need to control flow separations in highly loaded compressors, a numerical investigation is carried out to study the control effect of wavy blades in a linear compressor cascade. Two types of wavy blades are studied with wavy blade-A having a sinusoidal leading edge, while wavy blade-B having pitchwise sinusoidal variation in the stacking line. The influence of wavy blades on the cascade performance is evaluated at incidences from −1° to +9°. For the wavy blade-A with suitable waviness parameters, the cascade diffusion capacity is enhanced accompanied by the loss reduction under high incidence conditions where 2D separation is the dominant flow structure on the suction surface of the unmodified blade. For well-designed wavy blade-B, the improvement of cascade performance is achieved under low incidence conditions where 3D corner separation is the dominant flow structure on the suction surface of the baseline blade. The influence of waviness parameters on the control effect is also discussed by comparing the performance of cascades with different wavy blade configurations. Detailed analysis of the predicted flow field shows that both the wavy blade-A and wavy blade-B have capacity to control flow separation in the cascade but their control mechanism are different. For wavy blade-A, the wavy leading edge results in the formation of counter-rotating streamwise vortices downstream of trough. These streamwise vortices can not only enhance momentum exchange between the outer flow and blade boundary layer, but also act as the suction surface fence to hamper the upwash of low momentum fluid driven by cross flow. For wavy blade-B, the wavy surface on the blade leads to a reduction of the cross flow upwash by influencing the spanwise distribution of the suction surface static pressure and guiding the upwash flow.

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Influence of finite element mesh size on the carrying capacity analysis of single-row ball slewing bearing

Advances in Mechanical Engineering ◽

10.1177/16878140211009030 ◽

2021 ◽

Vol 13 (4) ◽

pp. 168781402110090

Author(s):

Peiyu He ◽

Qinrong Qian ◽

Yun Wang ◽

Hong Liu ◽

Erkuo Guo ◽

...

Keyword(s):

Finite Element ◽

Carrying Capacity ◽

Mesh Size ◽

Finite Element Mesh ◽

Fe Model ◽

Element Mesh ◽

Heavy Load ◽

Slewing Bearing ◽

Maximum Contact ◽

Slewing Bearings

Slewing bearings are widely used in industry to provide rotary support and carry heavy load. The load-carrying capacity is one of the most important features of a slewing bearing, and needs to be calculated cautiously. This paper investigates the effect of mesh size on the finite element (FE) analysis of the carrying capacity of slewing bearings. A local finite element contact model of the slewing bearing is firstly established, and verified using Hertz contact theory. The optimal mesh size of finite element model under specified loads is determined by analyzing the maximum contact stress and the contact area. The overall FE model of the slewing bearing is established and strain tests were performed to verify the FE results. The effect of mesh size on the carrying capacity of the slewing bearing is investigated by analyzing the maximum contact load, deformation, and load distribution. This study of finite element mesh size verification provides an important guidance for the accuracy and efficiency of carrying capacity of slewing bearings.

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