CN102967513A - Method for carrying out random vibration test on high-temperature working machine at normal temperature - Google Patents
Method for carrying out random vibration test on high-temperature working machine at normal temperature Download PDFInfo
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- CN102967513A CN102967513A CN2012105526936A CN201210552693A CN102967513A CN 102967513 A CN102967513 A CN 102967513A CN 2012105526936 A CN2012105526936 A CN 2012105526936A CN 201210552693 A CN201210552693 A CN 201210552693A CN 102967513 A CN102967513 A CN 102967513A
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Abstract
The invention discloses a method for carrying out a random vibration test on a high-temperature working machine at normal temperature, and particularly provides a method for carrying out the random vibration test on a mechanical product at normal temperature by transforming a temperature factor into a vibration test magnitude, belonging to a vibration failure test method of the mechanical product. The method comprises the following steps: computing the ratio n of the material strength of a product material at normal temperature and the material strength of the product material at working temperature; then increasing the ordinate value which corresponds to the random vibration test spectrum curve of the product material by n<2> times; drawing the random vibration test spectrum curve again; and carrying out a vibration test on the mechanical product according to the newly drawn random vibration test spectrum curve, wherein the material strength is the fatigue strength or the yield strength or the tensile strength of the product material. The method disclosed by the invention can simulate the influence of two factors, namely random vibration and high-temperature environment, on a product by only adopting common vibration test equipment, thereby simplifying the requirement of a vibration-temperature test method on test equipment.
Description
Technical field
The present invention relates to a kind of engineering goods be carried out the method for vibration test, relate in particular to and a kind of temperature factor is converted into the vibration test value, thereby at normal temperatures engineering goods are carried out the method for random vibration test.
Background technology:The inefficacy of many high-temperature machinery products is all relevant with the combined action of random vibration and working temperature.The strength of materials of product can descend in hot environment, and again through mechanical vibration, material just can be destroyed, and causes product failure in the situation that the strength of materials reduces; Therefore must make the random vibration failure test.For this reason, national standard " GJB150-1986 ", " GJB150A-2009 " have recommended respectively " vibration-temperature " compbined test method and " vibration-noise-temperature " test method(s) to come analog vibration factor and temperature factor combined action on the impact of product.
" vibration-temperature " test or " vibration-noise-temperature " be though test can reflect vibration factor and temperature factor more really to the joint effect of product, and these two kinds of methods all must the special multi-function test stand of employing; And this kind equipment generally can only be suitable for the product lightweight, that size is little, and the amplitude of heating generally is not higher than 180 ℃.For System for Large-scale Specimen, generally adopt common shaking table to carry out vibration test, test specimen is heated by thermal-radiating mode in conjunction with peripheral warming-up device simultaneously; The method not only needs the optional equipment warming-up device, and the temperature value is difficult to control, maximum temperature also is restricted.
At present, the heatsink weight that environmental control system uses on the aircraft generally reaches tens of several kilograms, working temperature and reaches more than 500 degrees centigrade.For such product, temperature factor will cause product material intensity that larger decline is arranged, and carry out at normal temperatures vibration test and can't truly reflect product to the adaptability of vibration environment, only carry out fully examination product of " temperature-vibration " compbined test.Yet because this type of product work temperature is very high, size and weight are larger, are difficult at present find suitable testing equipment that it is carried out " vibration-temperature " test.
Summary of the invention:For the defects that exists in the prior art, the present invention aims to provide the method for under a kind of normal temperature hot operation machinery being made random vibration test, it is that temperature factor is converted into the vibration test value, thereby can carry out random vibration test to engineering goods at normal temperatures.
To achieve these goals, the present invention is by the following technical solutions: according to the product material strength of materials and the strength of materials under working temperature at normal temperatures, calculate both ratio n, then the corresponding ordinate value of the random vibration test spectral curve of this material is enlarged n
2Doubly, repaint the random vibration test spectral curve, at normal temperatures engineering goods are carried out vibration test by the random vibration test spectral curve of new drafting; The described strength of materials is fatigue strength or yield strength or the pulling strengrth of product material.
In technique scheme, the described strength of materials is the fatigue strength of product material; If certain material is without the fatigue strength data, then available yield strength or pulling strengrth substitute.
When making random vibration test, the root mean square accekeration A that vibratory equipment is applied to power on the product and vibration test spectral curve is the linear dependence relation substantially, and the root mean square accekeration equals the square root of the area S that random vibration test spectral curve and transverse axis surround; That is:
Material intensity at normal temperatures is than improving n under the hot environment doubly.The test findings distortion that brings in order to offset strength of materials raising needs the power that vibratory equipment be applied on the product is also brought up to n doubly, is about to the root mean square accekeration and brings up to n * A.In order to improve the value of root mean square acceleration, the area that just random vibration test spectral curve and transverse axis must be surrounded must rise to n
2* S, this moment is n proportionally
2Improve the longitudinal axis value of random vibration spectral curve, can reach the purpose that improves this area.
Compared with the prior art, the present invention is owing to adopted technique scheme, temperature factor is converted into the vibration test value, therefore only need to adopt a common vibration rig can simulate random vibration and two kinds of factors of hot environment to the joint effect of product, thereby can finish at normal temperatures engineering goods are carried out random vibration test; Simplified the requirement of employing " vibration-temperature " test method to testing equipment.
Description of drawings:
Fig. 1 is the random vibration test spectral curve of certain engineering goods;
Fig. 2 is certain the engineering goods random vibration test spectral curve that repaints according to the inventive method.
Embodiment:The below is take certain engineering goods as example, and the invention will be further described with specific embodiment by reference to the accompanying drawings:
Embodiment, 534 ℃ of certain engineering goods working temperatures, use material to be 176MPa as 1Cr18Ni9Ti, this material yield strength at normal temperatures as 275MPa, yield strength under 534 ℃, its random vibration test spectral curve is seen Fig. 1; Concrete steps are as follows:
1) calculate material at normal temperatures yield strength with at the ratio n=1.56 of 534 ℃ of lower yield strengths;
2) the ordinate value among Fig. 1 is enlarged n
2Doubly (namely enlarging 2.434 times) repaints the random vibration test spectral curve of these engineering goods, gets Fig. 2;
3) at normal temperatures, according to Fig. 2 these engineering goods are carried out random vibration test.
As stated above this product is carried out vibration test, crackle appears in product, and this crackle is consistent with the crackle that product produces in actual use; And this product carries out vibration test according to curve shown in Figure 1, and product has no damage; Illustrate that the inventive method is effective.
Claims (1)
1. under the normal temperature hot operation machinery is made the method for random vibration test, it is characterized in that: according to the product material strength of materials and the strength of materials under working temperature at normal temperatures, calculate both ratio n, then the corresponding ordinate value of the random vibration test spectral curve of this material is enlarged n
2Doubly, repaint the random vibration test spectral curve, at normal temperatures engineering goods are carried out vibration test by the random vibration test spectral curve of new drafting; The described strength of materials is fatigue strength or yield strength or the pulling strengrth of product material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105526936A CN102967513A (en) | 2012-12-19 | 2012-12-19 | Method for carrying out random vibration test on high-temperature working machine at normal temperature |
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| CN2012105526936A CN102967513A (en) | 2012-12-19 | 2012-12-19 | Method for carrying out random vibration test on high-temperature working machine at normal temperature |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040112141A1 (en) * | 2001-03-23 | 2004-06-17 | Yukitaka Murakami | Long life fatigue strength design method for metallic material |
| CN101598650A (en) * | 2009-06-24 | 2009-12-09 | 深圳市网蓝实业有限公司 | Determine the method for member load-life curve and mission life thereof |
| CN101718651A (en) * | 2009-11-18 | 2010-06-02 | 上海理工大学 | Evaluation method of residual strength and service life under strengthening and damaging combined action |
| CN101975704A (en) * | 2010-10-08 | 2011-02-16 | 中国船舶重工集团公司第七二五研究所 | Method for predicting vibration fatigue performance of viscoelastic material |
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2012
- 2012-12-19 CN CN2012105526936A patent/CN102967513A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040112141A1 (en) * | 2001-03-23 | 2004-06-17 | Yukitaka Murakami | Long life fatigue strength design method for metallic material |
| CN101598650A (en) * | 2009-06-24 | 2009-12-09 | 深圳市网蓝实业有限公司 | Determine the method for member load-life curve and mission life thereof |
| CN101718651A (en) * | 2009-11-18 | 2010-06-02 | 上海理工大学 | Evaluation method of residual strength and service life under strengthening and damaging combined action |
| CN101975704A (en) * | 2010-10-08 | 2011-02-16 | 中国船舶重工集团公司第七二五研究所 | Method for predicting vibration fatigue performance of viscoelastic material |
Non-Patent Citations (3)
| Title |
|---|
| 孙忠元: "浅谈随机振动试验", 《中国航空学会控制与应用第八届学术年会论文集》 * |
| 陈朝阳: "确定金属材料高温低周疲劳曲线的方法", 《福建电力与电工》 * |
| 高宏明 等: "P92钢高温低周期疲劳性能试验研究", 《冶金信息导刊》 * |
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Application publication date: 20130313 |