基本信息
标准名称: | 液压螺旋压力机 基本参数 |
中标分类: |
机械 >>
通用加工机械与设备 >>
锻压机械 |
ICS分类: |
机械制造 >>
无屑加工设备 >>
锻压设备、冲压机、剪切机
|
替代情况: | JB 2474-1979 |
发布部门: | 全国锻压机械标准化技术委员会 |
发布日期: | 1999-05-14 |
实施日期: | 2000-01-01 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
归口单位: | 全国锻压机械标准化技术委员会 |
出版日期: | 1900-01-01 |
页数: | 4页 |
批文号: | 国机管[1999]274号 |
适用范围
JB/T 2474-1999 本标准是对 JB 2474-79《液压螺旋压力机 基本参数》的修订。 本标准规定了液压螺旋压力机的基本参数。 本标准适用于模锻、精锻等用的液压螺旋压力机。 本标准于 1979 年 10 月首次发布。
前言
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目录
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引用标准
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所属分类: 机械 通用加工机械与设备 锻压机械 机械制造 无屑加工设备 锻压设备 冲压机 剪切机
Product Code:SAE J1490
Title:Measurement and Presentation of Truck Ride Vibrations (STABILIZED May 2011)
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.