Papers by Keyword: Test Rig

Paper TitlePage

Authors: Christian Pabst, Semen Sharafiev, Peter Groche, Martin F.X. Wagner
Abstract: The two common processes of impact welding, explosion welding and electromagnetic pulse welding, may offer great technological advantages, but at the same time exhibit poor observability due to the use of explosives and a highly transient behavior, respectively. A novel test rig is developed and enhanced to collide and weld specimens purely mechanically. Besides its simple build-up and the easy and safe operation, the test rig allows setting crucial process parameters almost independently. The test rig’s construction and improvement is described. A trigger method for high speed imaging is developed and tested. The numerical simulation of the impact shows that the conditions directly at the welding zone are predictable and can be adjusted accurately. Finally, the preparation of specimens to evaluate the influence of surface roughness and grain structure is discussed.
Authors: Jian Mei Wang, Qing Xue Huang, Jian Zhao Sun, Xue Tao
Abstract: The lubricating system is the critical segment to ensure the good operation of bearing subsystem and the whole mill system. To keep pace with the advanced domestic and outdoors technologies, it is emergent to design and develop the mechatronic test rig of mill oil-film bearing. According to the detailed design parameters and design principles of lubricating system, its main modules and the lubricating mechanism are designed and implemented. The according 2D drawings and 3D solid models are successfully established. Consequently, the prototype is developed, and runs well in practical tests on mechanical parameters of mill bearing. Moreover, some further improvements are also made to better the performances of lubricating system.
Authors: A.O. Bligh, Noor A. Ahmed, Y.Y. Zheng
Abstract: Planetary gearboxes are required in many applications but have a high failure rate especially in wind turbines where rapid growth in turbine size is placing larger demands on the gearboxes. Current condition monitoring techniques are less effective at detecting faults in planetary gearboxes due to the complexity of the internal rotating components. A small scale planetary gearbox was, therefore, needed for testing on a gearbox test rig to develop a more effective method of condition monitoring. The detailed computer design and manufacture of the planetary gearbox for this purpose is detailed in this paper.
Authors: Simon Shun, Noor Alam Ahmed
Abstract: Dynamic stall is an aerodynamic phenomenon that may occur when an airfoil is subjected to rapid, cyclical changes in angle of attack with respect to the incident ambient flow. This phenomenon can often produce repeated and significant changes in lift and moment coefficients within very short time frames, which manifest as severe and rapid changes in structural loads. Rotorcraft such as helicopters and wind turbines are particularly susceptible to dynamic stall, which is a highly undesirable operating condition. The condition plays a part in limiting the forward speed of a helicopter whilst also producing cyclical loads that accelerate fatigue. The structural issues are more severe for wind turbines, where blade spans approaching seventy to eighty metres are becoming common. Research into techniques for reducing the severity of the undesirable effects of dynamic stall is often conducting in laboratory environments using wind tunnels as the main investigative tool. The required cyclical changes in angle of attack are achieved by using machines that oscillate the test airfoil about an axis parallel to the span of the wing. Such mechanisms can be powered electrically, mechanically, pneumatically or hydraulically, and have various combinations of complexity, advantages and disadvantages. The current work describes the design process of an electrically powered dynamical stall test rig. The use of CAD / CAM to assist in the performing of design calculations and a comparison of the rig with other mechanisms is presented.
Authors: Xin Zhang, Meng Zang, Lian Min Cao, Ning Ding
Abstract: By the analysis of the development tendency and test standards requirements of high-level hydraulic support, this paper primarily determines the chief technical parameters and overall structure of the test rig for whole hydraulic support, and its 3-D model is built and assembly check is conducted by using SolidWorks. Then, the hydraulic control system and data acquisition system of the test rig are designed. In the end, the 3-D model of the test rig is imported into COSMOSWorks to accomplish the finite element analysis. According to analysis result, the strength of the test rig can meet the requirements, which ensures the design quality of the test rig for whole hydraulic support.
Authors: Rui Yang, Jia Qian Li
Abstract: Based on the analysis of automobile bumper crash, and combined with the features of the bumper absorbing energy, a rig for bumper crash test was developed. The rig has advanced features of small size, wide-range of usage and arbitrary movement. The frontal and side crash can be tested according to different models and materials, and, hence, to provide a viable test method to study the general crash performance and energy absorption situation of the bumper, and reliable test data for investigation of automotive passive safety. In this paper, the structure and design of the rig is presented fist, followed by the working principles of the experiment system and theoretical analysis of the experimental process. An experiment was conducted which proved the successful development of the experimental system.
Authors: Peng Chen, Bo Qian Fan, Min Su, Jing Wang, Xiao Ping Ouyang
Abstract: High-speed railway rolling bearings are tested on a special test rig, where large transit axial and radial load is applied. Design of loading structure and electro-hydraulic servo loading system are used in the rig to simulate the real operating conditions of the bearings. A segment control strategy using different control parameters in different conditions is presented in this paper, for reducing the gap effect when the direction of the axial load is changed. This method effectively reduces the load response time to meet the technical requirements of the test rig.
Authors: Jing Ling Zhou, Guo Qing Wu, Xiao Yang Chen, Wei Nan Zhu, Yu Song Ren, Er Gang Gao, Jian Chun Chen, Wei Ming Zuo
Abstract: It is presented to apply the designing methodology in design of an accelerated pure rolling contact fatigue test rig for ceramic bearing ball. Starting with function analysis, the request and structure of test rig are analysed. Meanwhile, the form matrix table is established, from which many designing schemes can be obtained. In accordance with several kinds of innovation schemes, the appraised decision of product is analyzed. The specimen machine is made according to the design scheme in the design of innovation.
Authors: Mohd Razmi Ishak, Abd Rahim Abu Bakar, Subki Shamsudin, Muhammad Husaini Maskak, Mohd Kameil Abdul Hamid
Abstract: Brake judder is defined as disc or drum deformation-induced vibration which typically occurs at frequency less than 200 Hz. There are two types of brake judder namely, low speed (cold) judder and high speed (hot) judder. These two types of judder are often causing the brake pedal, steering wheel, suspension or chassis to vibrate. Consequently, it will affect comfort level of the driver and passengers. This paper focuses on the experimental investigation of low speed brake judder. In doing so, a laboratory test rig consists of disc brake unit, steering and suspension systems was used to assess level of brake judder vibration at different wheel turning angles. It was found that brake judder generated slightly high vibration at the steering wheel in the axial direction which led to a little uncomfortable feeling to the driver.
Authors: Artur Olszewski, Michał Wodtke, Piotr Hryniewicz
Abstract: First gas-lubricated compliant foil bearings (CFBs) were built in the 1950s. Due to their significant advantages, such as oil-free operation, good tolerance to bearing misalignment and very low maintenance, they have been penetrating the bearing applications for high speed compressors, air-cycle machines and gas turbines. The work presented here investigates a novel idea of water-lubricated compliant foil bearings, which could be used in applications where environmentally friendly lubrication is desired, for example in hydroelectric turbines or water pumps. Experimental results collected for three prototype water-lubricated foil journal bearings are presented. The tests were conducted under steady radial load and with the sliding speed varied incrementally. A sequence of design improvements is presented, with the best bearing demonstrating friction coefficient of about 0.01 at the sliding speed of about 4 m/s and the radial load of about 300 kPa. Encountered difficulties, research methodology and the testing equipment are also described.
Showing 1 to 10 of 23 Paper Titles