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Product Code:SAE J1490
Title:Measurement and Presentation of Truck Ride Vibrations
Issuing Committee:Truck And Bus Total Vehicle Steering Committee
Scope:There are two ways to assess the characteristics of ride vibrations of a vehicle during its operation. Subjective evaluation and objective measurement. Subjective assessments of the ride vibrations experienced by drivers during ride evaluations are generally performed by a panel of drivers and/or passengers who are instructed to operate or ride a group of vehicles in a predetermined manner in order to subjectively assess the levels and characteristics of ride vibrations. Figures 6A through 6C show examples of subjective evaluation forms presently in use. The disadvantages of the subjective method include need for careful experimental design, need for statistically unbiased samples, complexity of human perceptions of vibrations, and difficulty in comparing qualitative data of vehicles evaluated at different times and/or by different groups of people. Often ride characterization is not an easy task using only qualitative or descriptive terms. Therefore, it is necessary and desirable to develop objective techniques to enable ride engineers and others to measure ride vibrations during ride assessment in a quantitative manner.This recommendation details a uniform method for the measurement of ride vibrations of all Class 7 and 8 commercial vehicles, including both combination vehicles and straight trucks. Vibrations are to be measured utilizing cab and seat-pad mounted accelerometers in vertical (z axis) and fore/aft (x axis) directions. The measurement in lateral direction (y axis) is optional as these vibrations from a ride assessment standpoint are seldom significant in commercial vehicles. Several currently utilized methods of displaying, analyzing, and combining the measured accelerations are presented.This recommendation does not make any statements concerning how well any of the objective ride measures will correlate to subjective evaluations of ride, nor does it deal with any limits or establish any desirable values for acceptable ride.It is recognized that objective ride evaluation methods have some disadvantages due to the complexities of these measures, sophistication of instrumentation and analysis techniques, etc. Therefore, it is recommended that technically trained personnel conduct the objective tests and analyze the data.【英文标准名称】:Rotarypositivedisplacementpumps-Performancetestsforacceptance.
【原文标准名称】:回转容积泵.验收性能试验
【标准号】:NFE44-405-2006
【标准状态】:现行
【国别】:法国
【发布日期】:2006-02-01
【实施或试行日期】:2006-02-20
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:验收(鉴定);用户;定义;交货条件;适用性;流体技术;输入压力;维修;作标记;材料;测量设备;机械工程;容积式机械;变容真空泵;压力控制阀;生产;泵装置;泵;质量保证;规格试验;旋转泵;旋转;安全阀;联轴器;轴;轴(旋转);规范(验收);供应站;试验;试验条件;运输
【英文主题词】:Acceptance(approval);Customers;Definition;Definitions;Deliveryconditions;Fitnessforpurpose;Fluidtechnology;Intakepressures;Maintenance;Marking;Materials;Measuringequipment;Mechanicalengineering;Positive-displacementmachines;Positive-displacementpumps;Pressurecontrolvalves;Production;Pumpunit;Pumps;Qualityassurance;Ratingtests;Rotarypumps;Rotating;Safetyvalves;Shaftcouplings;Shafts;Shafts(rotating);Specification(approval);Supplier;Testing;Testingconditions;Transport
【摘要】:
【中国标准分类号】:J71
【国际标准分类号】:23_080
【页数】:18P;A4
【正文语种】:其他