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Case Studies & White Papers

Please find case studies and white papers listed below:

Case Studies:

	动力输出单元轴承分析
	Romax 公司为欧洲一家客户针对其现有的一个动力输出单元（PTU）进行了一项校核验证工作。
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	轴承标定项目案例
	Romax 公司为欧洲一家著名卡车制造商进行了一项轴承标定服务。该公司计划为其某款齿轮箱更换部分现有轴承以充分享受低成本采购带来的优势。
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	使用RomaxDesigner 确定深沟球轴承可以承受的最大轴向载荷
	概述深沟球轴承通常被设计成具有0° 接触角，并不适合承受轴向载荷。可是，在实际应用中因为预紧力和系统变形的原因，此类轴承必须承载一定程度的轴向力。
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	Romax and Hyosung - South Korea a world player in the wind turbine industry
	Hyosung is South Korea’s No.1 producer of electricity systems and with the assistance of Romax Technology, the company has ambitions to become a world player in the wind turbine industry – through designing and manufacturing its own units.
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	Wind Turbine Flyer
	RomaxDesigner a fully integrated durability and vibration CAE software analysis tool for wind turbine gearbox systems.
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	Complex Shaft/Bearing Analysis: Powershift Transmissions
	Companies that wish to compete must quickly develop innovative products. Recently, transmission engineers have been considering some unusual shaft/bearing arrangements for a new generation of gearboxes. The new arrangements present such a challenge to the traditional analysis methods and tools that Romax Technology has been asked by major bearing manufacturers to help. Using the unique analysis capabilities of RomaxDesigner, such an arrangement can be modelled and analyzed in less than a day.
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	Gearbox NVH: Gear Whine Reduction
	Can the levels of gear whine in be significantly reduced through optimising gear tooth geometry without increasing manufacturing costs? Reducing gear whine can be achieved by tackling the noise excitation mechanism at source by reducing the transmission error (T.E.). TE is highly sensitive to manufacturing tolerances, yet these cannot be tightened without significantly increasing manufacturing cost. Therefore, a solution is required where gear whine can be reduced without driving up cost.
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	Gearbox NVH: Transmission Error
	Can the transmission error of a gear pair under operating conditions be predicted prior to test? One method of obtaining a quieter gearbox is to tackle the noise excitation mechanism at its source, by reducing the transmission error (T.E.) generated at a misaligned gear mesh. This is currently accomplished through development testing.
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	Effect of Housing Flexibility on Gear Mesh Misalignment
	Can the effect of the housing flexibility on a transmission's internal components be predicted? Correct operating alignment of gears is essential if they are to achieve the required goals of low noise and high durability. However, most companies have to rely on costly and time-consuming tests to determine how the gears are meshing.
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	Roller Bearing Thrust Capability
	How do manufacturing tolerances influence the reliability of a thrust roller bearing? The input shaft roller bearing (Figure 1) began to fail prematurely with a change of bearing supplier. Romax undertook a project to examine the bearing design and manufactured quality from two bearing suppliers, to determine the cause of failure.
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	Microgeometry
	Can involute modifications be used to optimize the transmission error of a gear pair? It is an established practice to apply involute modifications to gear teeth to improve running smoothness (Figure 1). The amount of tip relief is easy to determine - enough to allow for tooth deflection and manufacturing tolerances. However, the extent of tip relief (how far down the tooth it is applied) is also a critical factor but this is more difficult to determine.
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	Hypoid Axle: Mesh Misalignment
	Can the operating mesh misalignment of a hypoid gear pair be predicted prior to test? The four parameters used to characterise hypoid mesh misalignment are illustrated in Figure 1
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	Split Torque Transmissions: Comanche Helicopter
	Can the powerflow in split torque transmissions be accurately and rapidly predicted? Comanche is the first U.S. helicopter to use a split torque gearbox. The prototype showed that the four load paths were not sharing the load equally and gears were loaded beyond acceptable limits (Figure 1). This case study compares the RomaxDesigner analysis results with NASA test results (NASA Technical Memorandum 107201, Oct 1996).
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White Papers:

	Analysis and Optimisation of a Transmission for Component Life
	There is pressure on every company to continuously improve the performance of their products. As powers and torques increase, and the space available for the transmission becomes less, there is intense pressure for gearboxes to be smaller and lighter, yet take more power and still be reliable. Analytical techniques are essential to being able to optimise any design without having to resort to expensive design-test-re-design iterations. This document outlines the approach developed by Romax Technology to achieve reliable gearboxes in a minimum time.
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	Design Analysis and Optimisation Automotive Transaxle
	Romax Technology has developed RomaxDesigner, a specialised software package developed for the integrated design and analysis of rotating machinery, specifically transmissions. This document describes the methods used and the results available by carrying out design analysis and optimisation of an example automotive transaxle. The example gearbox has been created by Romax Technology to represent the sort of transmission that is commonly in use today. In addition, an attempt will be made to consider the sort of processes that occur in most transmission manufacturing companies. Hence, this document should provide an informative and interesting account of how modern software can be used for transmission design.
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	Designing Automotive Transmission for Optimum Noise
	For the transmission manufacturer, the pressure of continuously improving the performance of their products demands the improvement of component life and gearbox noise. Analytical techniques are essential to being able to optimise any design without having to resort to expensive design-test-re-design iterations. This document outlines the approach developed by Romax Technology to achieve quiet and reliable production gearboxes in a minimum time. It will be seen that no other company is capable of supplying such a complete set of tools and techniques.
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	Predicting Variation in the NVH Characteristics of an automatic Transmissio

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	Epicyclic gear transmission error – The importance of Controlling Toleran

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	Finite Element Optimisation of a Truck Transmission Housing

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	Automatic Transmission NVH Refinement and Robust Optimization through

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	A Rapid Method for the Investigation of System-Wide

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	A Novel Approach to Structural Optimisation of an Automotive Gearbox Housin

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	Towards a Verified Tool for the Investigation of

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	A New Method for Energetic Analysis of Hybrid Drive Trains

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	A New Methodology for Wind Turbine Gearbox Design and Assessment

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	A New Methodology in Wind Turbine Gearbox Design and Assessment

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