Analysis on the steady state performance of a multi pad externally adjustable fluid film bearing

Purpose This study aims to investigate the performance characteristics of an externally adjustable bearing with multiple pads in steady state conditions. The proposed adjustable bearing geometry can effectively control the hydrodynamic operation in bearing clearances by adjusting the pads in radial and tilt directions. These pad adjustments have a significant role in improving the bearing characteristics such as load capacity, attitude angle, side leakage, friction variable and Sommerfeld number, which will be analysed in this paper. Design/methodology/approach The adjustable bearing is designed with circumferentially spaced four bearing pads subjected to similar radial and tilt adjustments. Tilt angles are applied along the leading edges of bearing pads. A modified film thickness equation is used to incorporate the pad adjustments and accurately predict the variation in film profile. Finite difference approximation is adopted to solve the Reynolds equation and discretize the fluid film domain. Findings For negative radial and tilt adjustments, higher hydrodynamic pressures are generated in bearing clearances, which increases the bearing load capacity at different eccentricity ratios. From comparative analysis for different pad adjustments, superior bearing performance is observed for bearing pads under negative radial and negative tilt adjustments. Originality/value This research presents a detailed theoretical approach to analyse the performance capability of a four pad adjustable bearing geometry, which is not available in literatures. Improved bearing performances with negative pad adjustments can attract bearing designers to implement the proposed adjustability-bearing concept in rotating machineries.

Numerical Investigations on the Sealing Performance of a Reciprocating Seal Based on the Inverse Lubrication Method

The work presented in this paper describes a new approach to calculate the film profile, friction, and fluid transport of a reciprocating U-cup seal used in a hydraulic piston pump. An innovative partial lubrication model of the seal is developed, which connects the inverse hydrodynamic lubrication method and Greenwood–Williamson asperity contact model. Finite element models (FEM) were established to simulate deformation behavior under-mounted and pressurized process using finite element code ansys. Based on the finite element simulations, corresponding numerical calculations have been made using the matlab with the inverse hydrodynamic lubrication and asperity contact theories. The accuracy of these models was validated against existing experimental data to ensure that they can predict the sealing performance sufficiently. The effects of the operating parameters as well as the magnitude of interference on the sealing performance in terms of friction, fluid transport, and film thickness were discussed. The results of the simulation indicate that the interference fit, sealed pressure, and rod velocity play significant roles to improve the wear and seizure resistance capability that is critical to the service life of the seal.

Promotion of Can Macanan Kaduk Traditional Arts Through Audio Visual Technology

Jember Regency is one of the regencies in East Java Province. Here, the growth and development of the culture are extremely rapid and cultural diversity has spread through the southern and northern regions with its respective uniqueness. The southern region is famous for its Javanese culture and the northern region with its Madurese culture. This has led to a combination of the two cultures, resulting in a performing art that is the combination of Javanese and Madurese culture, known as Can Macanan Kaduk. This traditional performing art is an art in Jember that is still maintained by some people. It is needed to support the creation of this performing art and promote it through audio-visual marketing technology so that it will ultimately become widespread and will be better known by the other people outside of Jember. To realize the program objectives, coaching and mentoring has been carried out, regarding the performing arts management with the artists of Can Macanan Kaduk. We create audio-visual work for them to help promote Can Macanan Kaduk. The promotion materials are based on audio-visual technology, consisting of the documentary film, profile videos, and audio-visual advertisement. Through audio-visual promotion and online marketing in websites and offline marketing in DVDs, it is hoped that this traditional performing art, Can Macanan Kaduk, will be widely recognized and gain stronger attention from foreigners, becoming a traditional performing art that characterizes the cultural identity of the Jember Regency. Key Words: Audio Visual Technology, Can Macan Kaduk, Promotion.