外文翻译--汽车发动机正时链系统的设计方法和性能试验

吉林大学本科毕业论文汽车发动机正时链系统的设计方法和性能试验近年来，随着链传动技术的不断发展，汽车发动机越来越多的采用了正时链、机油泵链、平衡轴链、共轨泵链等。由于汽车链的高速多冲、大载荷以及速度与载荷的交变特性，其承载的功率与速度已远远超过普通工业链条的承载能力,并且其工作点及性能指标已跨越了常规意义下链传动技术领域,失效机理及设计理论也发生了根本变化，从而形成了学科的前沿研究领域和行业内亟待解决的关键技术。由于发达国家的技术壁 的 ，不 车形成 的 设计与 技术，而且汽车 的关键 技术也大多 。前国内 发动机链传动的设计方法，国内 多发动机 业的正时传动系统 国设计，正时链条也大多 于。，研究发动机正时传动系统的设计方法及其失效机理，currency1 的 技术 “意义。汽车发动机正时传动系统的设计方法与性能试验，fi国家科技 fl 业技术 ” 高 度汽车发动机用链研究 的“成 。论文fl汽车发动机正时链设计 内， 国内 发动机生 业fl了 用，发动机正时链失效fl的 研究成也 业 生 fl 了指 作用，汽车链 了 大的 高。 链传动 动学了 链传动 动过 fl，从动 速度 与链 不 、不 、不 下的 特性，并计了 特 下的速度不 系Kl ，并通过与计 了链传动 特 传动下，并不fi 于正 线 X轴上 线形 。 fl 较短的下，不 链 、不 的链传动， 齿交替 瞬间，速度不 系线会现尖点、非对称的波动及 于三波形等传递特性；了不 时，速度不 系 线的变化趋势；以及较长fl 时，张紧装置的支撑点 置 尽可能的将链传动设计成 传动。本文的与研究步丰富了链传动的1吉林大学本科毕业论文理论内， 时也发动机正时链系统设计 供了理论支撑与思路。二 汽车发动机正时链系统的设计方法了汽车链的服役条 及其 失效形式，阐述了汽车链的选择与计方法， 了汽车链圆弧垂度和链长的解表达式，研究了张紧器工作行 以及张紧器 板、阻尼器 率半径和长度的设计准则， 了汽车发动机正时链系统的设计方法。试验研究表明，这设计的计方法，对于 研发汽车发动机正时链系统 “意义。发动机链传动fl的链长设计，不 于常规的求解fl 和链条垂度的方法。 传统方法不能 成汽车传动链设计的下，本文采用解法、非线性方 确 坐标法、CAD辅助等方法来确链长，研究了链长、张紧器与阻尼器 板 率半径、张紧器工作行 等参的设计方法，并给了段圆弧或三段圆弧张紧器 板的设计思路与方法。这方法的currency1，将改变我国正时链系统国设计的被动局面。三 汽车发动机正时链传动试验与失效试验 用的发动机国 49Q双轴正时链传动汽油发动机，车道路试验行驶万公 ，链条伸长率.94%，行驶 国轿车行驶 的5%左右。试验 了正时链失效机理，并侧“了滚子、套筒、销轴之间的磨损方式， 高链条 供了 据。试验“点了汽车链的 滚子失效的 原:多冲特性、夹杂、冷挤划痕与台阶、变形与过热等，并 针对性 切可行的改currency1议。试验表明:试验前后的内链节松动扭矩明显下降。试验fl的正时链条滚子现破碎、深度裂纹、微裂纹等不 度的磨损和不 形式的损坏。滚子 受交变多冲的交变载荷作用下而 生了 性变形，滚子的高度 。这特 与普通工业链条的滚子fi不 的，而currency1议， 设计与 过 fl， 的内链节与滚子之间的间 。 下可以 滚子断 台阶 力 及 裂纹；滚子 表 fl的夹杂fi滚子现裂纹的 原，滚子 工过 fl 的台阶则fi滚子2吉林大学本科毕业论文断裂的根 。 高滚子的 工 fi 高链条 的关键。汽车发动机正时链的微动磨损由于汽车链的高速以及交变速度的多冲性， 销轴与链板、套筒与内链板 以过 方式 的 的 表面生了 性变形， 了销轴与链板 、套筒与内链板 fl间的 度降， 度降 度时， 表面currency1松动并“ 汽车链失效。试验前后内链节松动扭矩fi 下降。试验fl发现fl 间 的fl链板与销轴之间的工作 面现了 的 纹，而 销轴 与 链板过 的 面不 这现。这 表面的形成，fi ，并且 垂”交变载荷与表面切 力的 力作用下 的，“形成了 面的变形。通常的微动磨损fi着、裂破坏，本文 了 的下，并不 会现表面的破坏， 不 下 现的表面 的变形与 ，表现破坏方式 不 。前微动学的研究 方 ，其以发达国家的发展较 ，表高科技的微动学被越来越多的 “。用子动力学 研究 的 变和面 现、 与 形成与 的研究，以及 微 的学研究越来越多，机 fl 的破坏方式fi 前热 研究的。于上述理论 ，了汽车发动机正时链传动系统 工作fl的微动磨损特 与验 fl的试验之间的不 特点，并以子动力学方法 研究并 磨损过 fl由于 度 、力作用下现的扭矩 生的微动、 面 等多 学fl的 ， 的子 与 的变化，“形成了链板与销轴的 变形。研究发现， 变形 发动机正时传动系统fl不fi 的失效 ，给本研究方 了 的微动学方 的研究。Hy-Vo齿形链磨损特性的研究通过计以及300 时的台磨损试验，研究了3吉林大学本科毕业论文Hy-Vo齿形链的磨特性，表明，由于Hy-Vo齿形链的对对滚 销轴以滚动 交替承载磨损，其承载表面 较普通滚子链以及圆销式齿形链，Hy-Vo齿形链 较高的磨性。对Hy-Vo齿形链的 销轴、内- 链板以及 链板的磨损表面 了SEM形 。销轴的磨损机 磨损，工作链板的磨损机 磨 磨损和 磨损。Hy-Vo齿形链台试验fl，发现了其特 的传动现， 链 速 后，Hy-Vo齿形链的松现了特 的上 现，这fi 链 速下套筒滚子链和圆销式齿形链传动试验fl 现过的特 现，现的现与Hy-Vo齿形链传动fl的上 关，也与 力 关， 力不fi 成现的 原。由于Hy-Vo齿形链的松上 的特 现，而，松 上、紧 下的Hy-Vo齿形链 可以 传动工的 求，不会发生由于链条磨损伸长而 松 上的链条与链 齿的 涉现，从而和证了这Hy-Vo齿形链 广泛的适用性。Hy-Vo齿形链链 公法线长度的设计计方法Hy-Vo齿形链链 公法线长度fi 其传动性能的“精度指标。 了Hy-Vo齿形链链节围 链 齿上 时其节 和 对公法线长度 的 上，根据Hy-Vo齿形链与链 的正确 条 ，通过参变化，currency1了Hy-Vo齿形链链 滚刀三者之间的 设计 系， 了既可适用于链板齿形等于链 力，也可适用于链板齿形不等于链 力的Hy-Vo齿形链链 公法线长度的设计计方法，试验研究表明，这的设计计方法fi科学的，切可行的。 时，指了大负变 、短齿、齿顶倒大圆的Hy-Vo齿形链链 公法线长度、跨测齿的计与修正方法。汽车链 寿命威布尔布形 参的探讨探讨了汽车链 寿命的布规律， 了汽车链 寿命威布尔布形 参随链条规、载荷水平变化的特点，设计了可寿命的抽检验方法，从而汽车链 可性设计和验证供了“ 据。4吉林大学本科毕业论文时链测试用综述其fl“关键的 汽油发动机 ，可以帮助减少 害污染物和 持适的燃烧fi 精确 步阀列车。时间链连 轴与 或多 轴必须 持 广泛的速度， 速度，以及适的 度非常精确的 ，以确 阀 排气费用。现时机链拥 卓越的成绩和它fi“好的 材料和能工艺 供高可性和噪音。坚持 每的汽车发动机，的 驱动系统必须不断跟踪，控 和记录。 用 度，伸长率磨性，弹性延伸，和 性变形来评价。作 系统，驱动器行测试的负载， 度， 力，并动议。US Tsubaki, Inc., Chicopee, Mass.fi 突的公司 汽车发动机 商专 设计和生 优 时间链 驱动系统。引擎范围从1.55.5升 网上和五缸的置，每 独特的 驱动系统。原设备 商求链链 系统fi非常可，安静，和 持的时间精度“高可能超过生命的 。 于US Tsubakis专业 和客户 意度 供“好的 驱动系统的引擎。了确 这点的 ，US Tsubaki拥 的现检测设备用于的验证和寿命测试时间链 驱动系统。无论fi 的验 和客户的网站，工 师 可性试验记录时据长时间。潜 的解决方案设备 次委托 十多年前，据采集系统fl的测试验 成的字 波器和字音频磁带。这设备 于少几 投 和可选的收购率，以及大 的据， 可以 理商店远远于 的面的寿命测试。糟糕的fi，软 供了这设备 的据 交给 特 的 子表式，几乎 的力充据。IOtech的解决方案“近，尼尔凯西 工 验 管，评估几 据采集系5吉林大学本科毕业论文统，其 的fi改和验 的能力，获取，储和关键时序链 驱动系统的性能。“近，尼尔凯西 工 验 管，评估几 据采集系统，其 的fi改和验 的能力，获取，储和关键时序链 驱动系统的性能。， 购买了IOtech WaveBook 。凯西的 currency1发和测试，以 的性能标准， 它现 能 跟上不断变化的 求， 通常下， 的引擎 准备好符 链 轴驱动系统，测试仪器，凯西站 器，本上仿发动机 驱动器。试验台包含链 ，指南，和张紧， 于正fi 将 这 特 的引擎。 动机的速，通过系统 的速度范围内，将 行 的车辆。凯西说， 长的 性试验，我 用WaveBook测 ，记录和 据计机的 驱动器fl。 ，我可以根据 关据行时。 前，凯西 用16 通道， WBK16 8 变计， WBK40 14热 ，和 以 网 。 了 道的 性， ， 被 能力选择 采集速度。凯西说随着 波器，我 的 置采集速率。这意 着 获大 不必的据或不获取 的据来准确 评价 系统。根据采集速度 本 行fi通常的2.5 ，这我 不会现失 的 ，软 可以 我将它说。Wave Book记录的议案， 力，力， 变， 度和 动。 间 传 器测 动 紧的 。 力传 器测 油 张紧和 点的引擎。 负载 的 紧发的支点。这我 供了 估计的负荷 行链，这fi关键的寿命 测系统， 凯西说fl我不过的 驱动系统，currency1破它或减少其 用寿命。我 的设计规范，以 其 “寿命和WaveBook确我不会超了 。变计适用于 的支点指南和指 的 力。热 测 油 过 fl 油路和发动机，特fifi近的 张紧。从理论上来说，时间链 轴驱动系统包 性的 度其fl方fi 紧张而其 已fi。这非常 的flfi可能引时间变化之间的 轴和 轴或由 来 。 学轴器置 轴和 轴每扭 和由 生的时间的变化关系。6吉林大学本科毕业论文我 WaveBook的 性，凯西说和其 ，紧的物理 。我 选择 获频率，以及 速，我可以设置它，并currency1”据。 ，它非常学和 用。 我fi 可以 客户的网站。凯西说， DASYLab 软 fi优的 ，后 理，currency1表和，并 生 意布局 上，工 师可以 用它来currency1 测试序列。并 用户不技术精明的 商。 的形面，用户面，能 线 道 序和规fi。对于我客户特fi“的fi文 的式。我与多汽车 商和工 的工作 不 的文 式。与WaveView ，我 选择 通常 用的文 式。论US Tsubakifi设计和生 优 时间链 驱动系统的几 的汽车 商。了确 高 ，专家行的 性和寿命试验的现 测试验 用IOtech WaveBook和理用于测 力， 度，和多其 变。7吉林大学本科毕业论文附录：吉林大学本科毕业设计翻译源文件The Design Method and Performance Experiments of Automobile Engine Timing Chain System As the development of the chains product and technology, the auto engine is adopting timing chain , lubricating oil pump chain, trunnion shaft chain and share rail chain , and so on. Since the auto chain has high speed, serious impact, excessive load and the alternate characteristic of velocity and load, the timing chain must burden exceed more power and velocity and need more capacity compare with common industrial chain. The working point and performance index have transcended the conventional chain transmission condition. Now the automobile industry of our country is developing rapidly. But we should do some self-reflection as a result of we dont know the technical of auto engine chain design method. Not only the integrity design and manufacture technical of independent property right about whole auto have not formed but also the key technicals of the parts on auto are mastered by foreign companies mostly. At present, the technology of chain transmission design on engine have not been mastered and many domestic engine enterprises depend on foreign design and most of the timing chains depend on import. Now the methods of design automobile timing chain havent been mastered. Many engine company automobile timing chains depend on other abroad company. Now many automobile timing chain products depend on import. It is important to study the design method of the transmission system of timing chain and the mechanism of invalidation and own the key technology with independent property right. The Design Method 8吉林大学本科毕业论文of Automobile Engine Timing Chain System and Its Ability Experiments is our Science and Technology ministry “Small and middle company technology study fund project”(01C26213300872) and it is the important parts of the “High strength automobile engine chain” and many important result have been used in many company.1 The kinematics analysis of chain transmissionIn this paper, we analyzed the meshing characteristic in the process of chain transmission. And we analyzed it in different angle and distance and dimensional structure respectively. Analyzing and calculating the nonhomogeneous angle velocity coefficient (Kl) in special statement. Through analysis and calculating, we also draw the angle velocity fluctuate picture in special state, which is not always similar with the part on X axis of sinusoid. When the distance between centers are short relatively, the curve of the nonhomogeneous angle velocity coefficient (Kl) will has a fastigium and unsymmetrical fluctuation and something like triangle wave in different sprocket and different phase in the instant of alternate meshing. We also analysis variety trend of the nonhomogeneous angle velocity coefficient(Kl) in different apart and when the distance between centre is long relatively the position of support point on tension equipment should keep the same phase. These study result and analysis more enrichment the chain transmission and provide theory for the automobile timing chain design method at the same time.2 The design method of timing chain system of auto engineWe analyzed the service condition and main format of invalidation of the auto chain and explain the method of selection and calculation of auto chain and educe the expression of the length in vertical direction and the length of auto chain. We have studied the design method of vibration damper strips and guide line of tensioner equipment and the curvature of the chain tensioner board and guide board. Put forward the design method of auto timing chain system. The test shows that the design methods play an important role in the process of studying the auto timing chain system independently.9吉林大学本科毕业论文It is different with general chain to solve the central distance and the length in vertical direction for the auto chain transmission. In the paper we adopt mathematics method of coordinate confirmed by equation and with the assistant of CAD to solve the length of chain. We also modify the length of chain in the process of design. With upward method, we can finish the design method of the length of chain and tension equipment and the curvature of guide board、the work process of tension equipment and so on at last. Then we put forward the design method of the board of tensioner equipment with two or three part of round arc and this method will be end the automobile engine timing chain need design by abroad company. 3. The transmission experimentation and invalidation analysis on the timing chain of auto engineThe experimentation was used 491Q engine with timing chain transmission made in domestic .And the experiment run 110000 Km and the protract ratio is 0.94% just only the half distance with others countrys car.After experimentation, the reason of timing chain invalidation was analyzed in detail and the emphasize particularly on wear manner among the roller、bushing and pin was also analyzed. It offers the gist for the elevation of chains quality. Quite a few breakage reasons about the roller, which were analyzed in the experiment are many impact characteristics lard hard-press nicks and steps distortion pass hot and so on. The out and inner chains become flexible because the toration descends.Lax torque of front, back, inside and outside chain descend after experiment； silent chain rollers appear fragmentation, depth crack, tiny crack etc. of different degree wear and different form damnification and plastic distortion of rollers under alternant changing load at work makes rollers height increase. We can see stress layer and track on end step of roller broken district by SEM scan electric microscope. The main reason of rollers track is lard in rollers flimsy layer, and the origin of rollers rupture is rollers step. So, the key of improve chain quality is improving rollers manufacture method and reduce the faults in the surface of the roller.4. Automotive Engine Time Chain Systems Fretting 10吉林大学本科毕业论文wearBecause of the automotive chains high velocity, changeable speeds repetitious concussion, the copulated surfaces of the two interfered parts which are connected by the pin and the outer link plate hole, the sleeve and the inner link plate hole, tiny abrasion occur on the pins. Followed by the tiny abrasions strengthen gradually, the intensity between the pin and outer link plate hole, sleeve and inner link plate hole decreased. When it reachs on some degree, the two copulated surfaces begin to become flexible and which would resulted in the automotive chains invalidation.In the process of the automotive engine time chain systems invalid mechanisms analyzing and the microcosmic shapes SEM analyzing of the experiments time chain, I found that there is fine wrinkle on the working combinative surfaces of the middle link between the plate and the pin, while there is no such phenomenon on the combinative surface between the same pine and the two outer link plates. Under nanometer conditions, It is because of the resultant force of the vertical and changeable load and the surface tangential force that make such things occurred. Different with the touched in small-scale, The phenomenon occured in this experiment of the tiny abrasion is another typical earlier character of the nanotribology area, and which make the damage system of the nanotribology moved up one step. The common tiny abrasion is damaged by adhering and lacerating. In this thesis, I considered that in less displacement conditions it is not always appears the surfaces damage, the crystal lattices deformation and displacement always occurs firstly in different conditions. At present, the study of tribology is in the ascendant all over the world, especially in the developed countries. As the commissary of high-tech, tribology has been paid great attention. Using the Member dynamics model, The productions of nanotribology based on the phasic change of the solid liquid forms and the slippage phenomenon of the interface in nanometer lever, the displacement made by the solid crystal lattice and crystal interface, and study of the displacement swing in micron class in nanotribology appears more and more in authoritative publications all over the world. Using the Member dynamics model, the research in opening out the interaction and the 11吉林大学本科毕业论文rules of the factors, such as the temperature, friction and touching area etc, analyze the unusual destructive methods in the mechanism has become a pop research subject. This experiment is based on the foundation above-mentioned. It analyzed the character of the nano-jiggle abrasion in the automotive engine time chain transmission systems practical work and the difference between the Fritting wear practical work and the experiment in the lab. The Fritting wear between the middle link plate and the pin can be considered as the multiple movement between the radial jiggle and the tangential jiggle, Also it can be defined as the combination between the radial jiggle and rotational jiggle on the whole. This is the typical combinatorial pattern of the jiggle abrasion. In the experiment, the jiggle appears in the lubrication surface in nanometer level.It may shape the tiny nick on the surface in the process of the link plates pressing. It is exactly these tiny nicks gradual changes produced the jiggle distortion, then the surfaces heave and hollow large, which resulted the coupling distortions formation between the link plate and the pin in the end. This coupling distortion isnt the main invalid factor of the engine transmission system, however, it brings a new investigative in the field of the fretting wear.5. Assistant parts Ability Experiments in the timing chain system We has analysis the elongate rate of the wear lead to the change of the mesh position of the automobile and influence the camshaft lag angle. And we did the experiments of different material of the vibration damper strip and tensioner frictions； analysis the influence on the automobile engine take into air and exhaust and working ability with camshaft lag angle.In the recent years, research on transmission system design method of automobile engines silent chain is developed associated with corporation technique center； we synthetize by the numbers theory and technique of many subjects mechanics , mathematics , dynamics, tribology, material science, numeric design method, micro computer analysis technique, TCA technique, emulational technique, CAD, CAGD and so on , and get a series of important research result possessed independent knowledge able property right ； and we 12吉林大学本科毕业论文respectively get certificate of segmental automobile mainframe and engine factory such as the First Automobile Manufacture Factory, Shanghai Automobile Manufacture Factory, Shenglong, Qinouji, Changan Fute, Nanjing Yiweike, Anhui Qirui, Guangxi yuchai, Haerbin Dongan and so on； achieve anticipation that the automobile chain made in china； bring important economic and social benefit； offer wide research space that many subjects intersect； engender new technique innovation of industrial and research & development system with making,studying,researching； have not only theory meaning but also higher applied value. The automobile chain system will develop in the direction of high rotate speed, small section distance and individuation, along with the request new-style saloon car engines lightweight, low noise and high reliability. Based on high speed character of automobile chain system and research on invalidation mechanism, this thesis R&D and bring key designing manufacture technique and reliable experimentation method that have independent knowledgeable property right and adapt domestic use, and establish stable base for design theory of high-speed chain transmission. Research on the Wear Characteristics of a New Hy-Vo Silent ChainThe wear resistance characteristic of a new Hy-Vo silent chain has been studied based on the calculation and the experiment on the test bench for 300 hours. The result shows that a pair of heterogeneous pins of the new Hy-Vo silent chain alternatively bear the load with rolling friction, which makes the bearing surface pressure of the special-shape pin is lower than the pressure of roller chain pin and silent chain pin, thus the new Hy-Vo silent chain has excellent wear resistance. The wear surface morphologies of the plate and the special-shape pin were analyzed by SEM. The wear mechanism of the pin is fatigue wear and the wear mechanism of the plate is abrasive wear with fatigue wear.The special phenomenon has been found in the bench test of the New Hy-Vo Silent Chain, that is the slack span raised when the sprocket speed up to certain value. This phenomenon did not appear at the bench test of the roller chain and the round-pin Silnet Chains under the same sprocket speed. This special phenomenon relates to the upswept angle and the centrifugal force of the Hy-Vo Silent Chain. However, the centrifugal force is not the main reason witch caused this 13吉林大学本科毕业论文phenomenon. The arrangement slack span is at upside and the tight span is at the underside of the chain also can meet the transmission requirement because the New Hy-Vo Silent Chains has the slack span raised characteristic, and the interference between the slack span and the sprocket tooth for the wear-elongation were not happen. The New Hy-Vo Silent Chain can be used at broader field than other type chains.The design calculation on common normal line length of Hy-Vo silent chain sprocketThe common normal line length of Hy-Vo silent chain is the important precision index that can affect the performance of transmission. Through transformation of parameters, the meshing design system among Hy-Vo silent chain, sprocket and hob was built up based on the researching of the pitch increment and the equivalent apothem increment of the effects on the common normal line length when the Hy-Vo silent chain was wrapped around and located on the sprocket, with the proper meshing conditions of Hy-Vo silent chain and sprocket into consideration. The design method of common normal line length was put forward that can be used when the value of the sprocket pressure angle is equal or unequal to the value of the Hy-Vo chain plate pressure angle. Experiments show that this new design method is feasible. In addition, the calculation and amendment of common normal line length and the measuring teeth number was investigated for the sprocket with large negative modification coefficient, stub teeth and large fillet radius.Study on Weibull distribution form parameter of automotive chain fatigue lifetimeIn this paper distribution function of automotive chain fatigue lifetime are discussed and characteristics of Weibull distribution form parameter of fatigue lifetime that vary with its specification and loading are analyzed, then sampling inspection plan of lifetime of reliability is designed. This paper provides a sound basis for reliability design and reliability proof of automotive chain fatigue lifetime.Timing Chain TestingApplication SummaryOne of the most critical factors in a gasoline，engine that helps reduce harmful pollutants and maintain proper combustion is a 14吉林大学本科毕业论文precisely synchronized valve train. The timing chain connecting the crankshaft with one or more camshafts must maintain extraordinarily accurate dimensions over a wide range of speeds, accelerations, and temperatures to ensure proper valve positioning for intake and exhaust charges.Modern timing chains have superior finishes and are manufactured with the finest materials and processes available for high reliability and low noise. To uphold that quality for each generation of automobile engine, the components of the cam drive system must be continuously tracked, controlled, and recorded. Components are evaluated for strength, wear elongation, elastic stretch, and plastic deformation. As a system, the cam drive is tested for load, temperature, strain, and motion.US Tsubaki, Inc., Chicopee, Mass., is one prominent company that designs and manufactures premium timing chain cam drive systems for major automobile engine manufacturers. The engines range from 1.5 to 5.5-liter displacement with in-line and V-cylinder configurations, and each requires a unique cam drive system. OEMs demand that the chain sprocket systems be extremely reliable, quiet, and maintain the highest timing accuracy possible over the life of the product. They depend on US Tsubakis expertise and customer satisfaction to provide them with the best cam drive system for their engine.To ensure this quality, US Tsubaki houses a modern testing facility devoted to product validation and life testing timing chain cam drive systems. The engineers record real-time data over long periods during reliability tests, both in their laboratory and at customers sites.Potential SolutionWhen the facility was first commissioned more than a decade ago, data acquisition systems in the test lab comprised digital oscilloscopes and digital-audio tapes. But this equipment is limited to only a few inputs and selectable acquisition rates, and the amount of data they can reasonably store is much less than that required for a comprehensive life test. Whats worse, the software supplied with this equipment limits data presentation to a specific spreadsheet format with hardly enough power to sufficiently analyze the data.IOtechs SolutionRecently, Neil Casey, Product Engineering Laboratory 15吉林大学本科毕业论文supervisor, evaluated several data acquisition systems with the goal of improving and updating the labs capability to acquire, store, and analyze critical timing chain cam drive system performance. He needed to expand the number of input channels and acquire more accurate data that could be easily presented to internal and external customers in different formats. As a result, he purchased an IOtech WaveBook . Casey is now able to keep pace with the changing demands of advanced product development and testing to rigid performance standards.Frequently, when a new engine is not ready to be fit with an advanced chain cam drive system, Casey instruments a test stand simulator that basically mimics the engines cam drive. The test stand contains sprockets, guides, and tensioners, all located exactly where they would be on that specific engine. An electric motor spins the system through the same speed range it would run in an actual vehicle. Says Casey, “During a long durability test, I use the WaveBook to measure, record, and stream data to a computers hard disk drive. Also, I can look at the data in real time.” Currently, Casey uses 16 analog channels, a WBK16 for 8 strain-gages, a WBK40 for 14 thermocouples, and an Ethernet interface. Besides the channel flexibility, he appreciates the ability to select any acquisition speed he desires. “With the oscilloscopes, we had limited selection of preset acquisition rates. That meant capturing enormous amounts of unnecessary data or not capturing enough data to accurately evaluate a system. I typically run 2.5 times the acquisition speed needed, so w